GTL + SMX + SM + SRF3 at Michelin Raceway Road Atlanta
One run is left out as not that car's own laps (far quicker than the car managed in any other session and than anyone else in its class all week; usually a swapped transponder): Jarrett Jones in Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta Morning test (1:26.895; the car's best in any other session was 1:43.195 and the rest of the class's best all week 1:42.071).
One row per driver and car (a driver who changed cars has a row for each). Each cell is that driver's best in that car across the selected events, with the session it was set in. Best 5-lap stint is the mean of the driver's quickest five consecutive race laps, and consistency is how far their median race lap sat behind their best in that race (small is a driver who does it every lap); both come from the race with the best stint. The fastest in each column is purple, and a car whose best lap is more than 115% of the fastest in its class is greyed (marked ">115%" beside the driver) and left out of the colour scale. Click a column to sort, a row to highlight it.
Theoretical lap is the sum of the best sectors, whichever laps they came from, and never slower than the best lap (where a car's fastest laps were recorded without sector times, its best lap is used). The 115% mark is about the car's best lap only: a car whose best lap is within 115% of the fastest in its class is never marked. Greyed sectors with no theoretical lap mean the sector times on file do not add up to a believable lap. Letters refer to the events above; Q is qualifying, R a race.
Sectors
S1 SF → IM1
S2 IM1 → IM2
S3 IM2 → SF
SPd IM2 → IM3 0.02 mi
Sectors are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.
By car
Car
Class
Drivers
Lap
Qual
Race
Trap
S1
S2
S3
Mazda MX-5
SMX
58
1:24.667Tyler Gonzales
1:38.517Jarrett Jones
1:24.667Tyler Gonzales
120.7Elivan Goulart
37.322Marcello Paniccia
35.817Camden Gruber
25.004Jarrett Jones
Mazda MX-5
SMX
4
1:24.667Tyler Gonzales
1:39.246Elivan Goulart
1:24.667Tyler Gonzales
120.7Elivan Goulart
37.748Joey Andrews
35.937Elivan Goulart
25.224Joey Andrews
Mazda MX-5 (2006)
SMX
14
1:38.501Skyler Cottrell
1:38.788Marcello Paniccia
1:38.765Skyler Cottrell
120.4Aiden Coleman
37.322Marcello Paniccia
35.950Skyler Cottrell
25.039Skyler Cottrell
Mazda MX-5 (2002)
SMX
1
1:38.517Jarrett Jones
1:38.517Jarrett Jones
1:40.037Jarrett Jones
120.4Jarrett Jones
37.557Jarrett Jones
35.938Jarrett Jones
25.004Jarrett Jones
Mazda MX-5 (2007)
SMX
3
1:38.662Camden Gruber
1:38.662Camden Gruber
1:39.308Camden Gruber
120.5Camden Gruber
37.437Camden Gruber
35.817Camden Gruber
25.070Camden Gruber
Mazda MX-5 (2010)
SMX
2
1:38.720Matthew Novak
1:38.720Matthew Novak
1:39.231Matthew Novak
119.0Deacon Greenfield
37.382Matthew Novak
35.925Matthew Novak
25.075Matthew Novak
Mazda MX-5 (2012)
SMX
3
1:38.821Cam Ebben
1:38.821Cam Ebben
1:39.428Cam Ebben
119.5Emy Kissick
37.373Cam Ebben
36.055Cam Ebben
25.098Cam Ebben
Mazda MX-5 (2013)
SMX
6
1:38.829Logan Stretch
1:38.829Logan Stretch
1:39.318Logan Stretch
120.5Gavin Vaughan
37.464Lincoln Larson
35.957Logan Stretch
25.025Logan Stretch
Mazda MX-5 (2014)
SMX
3
1:38.941Rocco Pasquarella
1:39.338Rocco Pasquarella
1:38.941Rocco Pasquarella
114.2Rocco Pasquarella
37.345Rocco Pasquarella
36.171Rocco Pasquarella
25.113Rocco Pasquarella
Mazda MX-5 (2008)
SMX
3
1:38.964Michael Tinis
1:38.964Michael Tinis
1:39.255Michael Tinis
118.9Michael Tinis
37.577Michael Tinis
36.013Michael Tinis
25.240Michael Tinis
Mazda MX-5 (2015)
SMX
3
1:39.138Sebastian Mateo Naranjo
1:39.138Sebastian Mateo Naranjo
1:39.504Sebastian Mateo Naranjo
115.0Sebastian Mateo Naranjo
37.516Sebastian Mateo Naranjo
36.079Sebastian Mateo Naranjo
25.212Sebastian Mateo Naranjo
Mazda MX-5 (2008)
SMX
2
1:39.228Will Robusto
1:39.228Will Robusto
1:39.924Will Robusto
115.0Will Robusto
37.573Will Robusto
36.188Will Robusto
25.292Will Robusto
Mazda MX-5 (2011)
SMX
1
1:39.286Michelle Squirek
1:39.286Michelle Squirek
1:40.039Michelle Squirek
120.2Michelle Squirek
37.590Michelle Squirek
36.246Michelle Squirek
25.292Michelle Squirek
Mazda MX-5 (2015)
SMX
4
1:39.307Jack Murchison
1:39.307Jack Murchison
1:39.994Jack Murchison
116.0Jack Murchison
37.624Jack Murchison
36.194Jack Murchison
25.073Jack Murchison
0 Mazda MX-5
SMX
1
1:39.426Helio Meza
1:39.426Helio Meza
1:43.767Helio Meza
113.9Helio Meza
37.862Helio Meza
36.323Helio Meza
25.211Helio Meza
Mazda MX-5 (2006)
SMX
1
1:39.443Max Schweid
1:39.443Max Schweid
1:42.060Max Schweid
115.3Max Schweid
37.711Max Schweid
36.016Max Schweid
25.291Max Schweid
Mazda MX-5 (2007)
SMX
1
1:39.517Austin Hill
1:39.517Austin Hill
1:44.342Austin Hill
114.4Austin Hill
37.837Austin Hill
36.011Austin Hill
25.669Austin Hill
Mazda MX-5 (2011)
SMX
2
1:39.533Donald Squirek
1:39.533Donald Squirek
1:40.092Donald Squirek
114.7Donald Squirek
37.546Donald Squirek
36.315Donald Squirek
25.328Donald Squirek
Mazda MX-5 (2010)
SMX
1
1:39.623Michael Borden
1:39.623Michael Borden
1:41.165Michael Borden
114.8Michael Borden
37.879Michael Borden
36.360Michael Borden
25.384Michael Borden
Mazda MX-5 (2012)
SMX
2
1:41.113David Pintaric
1:41.113David Pintaric
1:42.159David Pintaric
115.3David Pintaric
38.456David Pintaric
36.682David Pintaric
25.555David Pintaric
Mazda MX-5 (2009)
SMX
1
1:41.993Bryan Heitman
1:41.993Bryan Heitman
1:44.151Bryan Heitman
110.9Bryan Heitman
39.198Bryan Heitman
36.889Bryan Heitman
25.768Bryan Heitman
SCCA Ent SRF3
SRF3
77
1:33.550Peyton Long
1:33.550Peyton Long
1:33.785Richard Baldwin
148.7Robeson Clay Russell
35.267Robeson Clay Russell
0.719Steve Zemaitis
21.112Robeson Clay Russell
SCCA Spec Racer Ford Gen 3
SRF3
36
1:34.195Charles Russell Turner
1:34.195Charles Russell Turner
1:34.485Mark Eaton
128.8Derek Schofield
35.651Charles Russell Turner
34.194Charles Russell Turner
24.192Charles Russell Turner
Honda CRX
GTL
2
1:36.868Chris Bovis
1:38.327Chris Bovis
1:36.868Chris Bovis
118.0Peter Shadowen
36.854Chris Bovis
34.880Peter Shadowen
24.830Peter Shadowen
Honda CRX
GTL
1
1:36.868Chris Bovis
1:38.327Chris Bovis
1:36.868Chris Bovis
114.0Chris Bovis
36.854Chris Bovis
35.052Chris Bovis
24.872Chris Bovis
Honda CRXsi
GTL
1
1:37.372Peter Shadowen
1:39.153Peter Shadowen
1:37.372Peter Shadowen
118.0Peter Shadowen
37.621Peter Shadowen
34.880Peter Shadowen
24.830Peter Shadowen
Mazda RX-7
GTL
1
1:38.769Michael Lewis
1:39.220Michael Lewis
1:38.769Michael Lewis
112.5Michael Lewis
37.219Michael Lewis
35.828Michael Lewis
25.388Michael Lewis
Mazda Miata
GTL/SM/SMX
135
1:39.509Matthew Novak
1:39.509Matthew Novak
1:41.867Josh Hansen
114.8Matthew Novak
37.767Matthew Novak
0.806Skyler Cottrell
25.277Matthew Novak
Mazda Miata (2011)
SMX
1
1:39.509Matthew Novak
1:39.509Matthew Novak
1:43.823Matthew Novak
114.8Matthew Novak
37.767Matthew Novak
36.070Matthew Novak
25.277Matthew Novak
Mazda Miata (2006)
SMX
1
1:39.937Nico Bratz
1:39.937Nico Bratz
1:41.973Nico Bratz
113.4Nico Bratz
37.864Nico Bratz
36.578Nico Bratz
25.477Nico Bratz
Mazda Miata (2008)
SMX
1
1:40.594Josh Hansen
1:40.594Josh Hansen
1:41.867Josh Hansen
114.4Josh Hansen
38.355Josh Hansen
36.663Josh Hansen
25.576Josh Hansen
Mazda Miata (2001)
SM
20
1:42.071Stanley Brock Jr
1:42.324Skyler Cottrell
1:42.619Stanley Brock Jr
111.8Stanley Brock Jr
38.166Stanley Brock Jr
0.806Skyler Cottrell
25.854Skyler Cottrell
Mazda Miata (1999)
SM
55
1:42.453John Salerno
1:42.453John Salerno
1:42.611Travis Wiley
112.2Jonathan Neudorf
38.256Danny Steyn
37.750John Salerno
26.162Ethan Goulart
Mazda Miata (2003)
SM
8
1:42.553Charles Mactutus
1:42.619Charles Mactutus
1:42.553Charles Mactutus
111.4Charles Mactutus
38.190Charles Mactutus
37.772Charles Mactutus
26.223Charles Mactutus
Mazda Miata (2002)
SM
5
1:42.684Logan Stretch
1:42.684Logan Stretch
1:42.933Logan Stretch
111.6Logan Stretch
38.342Logan Stretch
37.764Jarrett Jones
26.226Logan Stretch
Mazda Miata (2004)
SM
3
1:42.738Francisco Barroso
1:43.360Francisco Barroso
1:42.738Francisco Barroso
111.4Francisco Barroso
38.441Francisco Barroso
37.969Francisco Barroso
26.322Francisco Barroso
Mazda Miata (2000)
SM
3
1:42.741James Newell
1:42.741James Newell
1:42.822James Newell
112.2James Newell
38.453James Newll
37.797James Newell
26.176James Newell
Mazda Miata (2002)
SM
5
1:42.965Nicholas Bruni
1:43.156Nicholas Bruni
1:42.965Nicholas Bruni
111.3Nicholas Bruni
38.282Nicholas Bruni
37.803Nicholas Bruni
26.431Nicholas Bruni
Mazda Miata (2005)
SM
1
1:43.034Jim Drago
1:43.034Jim Drago
1:43.345Jim Drago
111.6Jim Drago
38.583Jim Drago
37.940Jim Drago
26.304Jim Drago
Mazda Miata (2001)
SM
5
1:43.137Skip Brock_Jr
1:43.221Skip Brock_Jr
1:43.137Skip Brock_Jr
104.8Skip Brock_Jr
38.330Brandon Collins
37.918Brandon Collins
26.440Skip Brock_Jr
Mazda Miata (2000)
SM
2
1:43.170Tyler Brown
1:43.696Tyler Brown
1:43.170Tyler Brown
105.2Tyler Brown
38.475Tyler Brown
37.828Tyler Brown
26.545Max Ehrlich
Mazda Miata
GTL/SM
5
1:43.270Daniel Williams
1:43.270Daniel Williams
1:43.466Daniel Williams
110.7David Henderson
38.703Daniel Williams
37.954Daniel Williams
26.378Daniel Williams
Mazda Miata (1991)
SM
2
1:43.366David Stern
1:43.366David Stern
1:44.158David Stern
110.9David Stern
38.849David Stern
37.936David Stern
26.571David Stern
Mazda Miata (2005)
SM
1
1:43.367Senter Smith
1:43.946Senter Smith
1:43.367Senter Smith
103.8Senter Smith
38.557Senter Smith
37.910Senter Smith
26.681Senter Smith
Mazda Miata (2004)
SM
1
1:43.430Frankie Barroso
1:43.900Frankie Barroso
1:43.430Frankie Barroso
111.6Frankie Barroso
38.730Frankie Barroso
38.005Frankie Barroso
26.401Frankie Barroso
Mazda Miata (1997)
SM
2
1:43.449Cliff Brown
1:43.449Cliff Brown
1:43.780Cliff Brown
110.8Cliff Brown
38.716Cliff Brown
37.968Marc Cefalo
26.394Cliff Brown
Mazda Miata (1999)
SM
10
1:43.486Andrew Devoto
1:43.606Luke Pullen
1:43.486Andrew Devoto
104.0Andrew Devoto
38.381Andrew Devoto
38.142Andrew Devoto
26.496Tyler Klein
Mazda Miata (1994)
SM
1
1:43.685Chris Allen
1:43.760Chris Allen
1:43.685Chris Allen
111.5Chris Allen
38.909Chris Allen
38.070Chris Allen
26.280Chris Allen
Mazda Miata (2021)
SM
1
1:44.629Jeremy Fletcher
1:44.629Jeremy Fletcher
1:45.012Jeremy Fletcher
111.0Jeremy Fletcher
39.933Jeremy Fletcher
38.339Jeremy Fletcher
26.715Jeremy Fletcher
Mazda Miata (2003)
SM
1
1:45.409Jesse Singer
1:45.796Jesse Singer
1:45.409Jesse Singer
109.1Jesse Singer
39.519Jesse Singer
38.695Jesse Singer
26.726Jesse Singer
Mazda Miata (1994)
SM
1
1:47.151Mark Zwolle
1:47.434Mark Zwolle
1:47.151Mark Zwolle
103.4Mark Zwolle
40.543Mark Zwolle
38.928Mark Zwolle
27.421Mark Zwolle
Mazda Miata (1992)
SM
1
1:50.296Brad Williams
1:50.296Brad Williams
1:57.449Brad Williams
105.5Brad Williams
42.258Brad Williams
40.085Brad Williams
27.953Brad Williams
Toyota Tercell
GTL
1
1:41.074Graham Fuller
1:44.073Graham Fuller
1:41.074Graham Fuller
112.9Graham Fuller
38.847Graham Fuller
36.124Graham Fuller
26.086Graham Fuller
Lotus Exige
SM
1
1:44.891Anthony Geraci
1:45.028Anthony Geraci
1:44.891Anthony Geraci
110.7Anthony Geraci
39.247Anthony Geraci
38.540Anthony Geraci
26.855Anthony Geraci
The best any driver of each car managed across the selected events, with who set it. Spellings and model years of the same car are grouped; click a row marked ▸ to see each version. Grouping is worked out from the names, so tell us if two cars are wrongly merged or split.
Rule changes between these events
Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta → Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta 2023-03-10 to 2024-03-08
cars addedFields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.
As printed in Fastrack
In GT Spec Lines, GT1 Cars - Fields Cardinal, classify Fields Cardinal V8 as follows: GT1 Cars – Fields Cardinal Model Years Body Style Drive- line Wheel- base (in) Notes Fields Cardinal V8 2023 2 Dr. RWD 92.0 Roll Cage MUST be modified to comply with
Show 6 more lines
GCR Section 9.4. In GT Spec Lines, GT1Engines - classify Ford V8 as follows: GT1 Engines - Ford Engine Family Engine Type Bore x
A specification table follows in the original; it is not shown here.
unclearSRF Hoosier wet front tire updated to P/N 46100 P185/60R13 H20 or W2.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.f, change as follows: "Wet: Front – Hoosier P/N 46100 P185/60R13 H20 or W2 Rear – Hoosier P/N 46105 P205/60R13 H20 or W2 Ground clearance is 2.5" with driver as raced when P185/60R13 (H20 or W2) tires are used."
wordingSRF radiator rule clarified: P/N 480466 replaceable with Automotive P/N 1R698, CU698 or manufacturer equivalent with documentation.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.V.j, change as follows: "Radiator - Enterprises new style P/N 480465 (requires baffle P/N 480464) or P/N 480466 can be used. P/N 480466, may can be replaced with Automotive P/N 1R698, CU698 or equivalent OEM manufacturer justified by one cross-reference chart equivalent, as long as the size, shape, and material are the same as the original P/N. The capacity, core thickness, etc., cannot be changed even if allowed under the above. The competitor is responsible for providing this documentation of the cross-reference P/N."
wordingGTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL.
As printed in Fastrack
from the current (or before) Table of Contents (TOC), to what is shown in the after TOC. GTL spec lines will now be contiguous with GT2 and 3 spec lines. GTA category and spec lines will be moved and renumbered behind GTL. GTA Section will not change but page numbers will, (as shown in Red italics). 9.1.2.F. GT-2, 3, LITE Category Specifications 314 GT2 Cars 327 GT2/ST 341 GT3 Cars 348
fasterGTL small unrestricted engines under 1399cc lose 40-50 lbs across Alfa, AMC, Triumph, Mini, Sprite, Fiat, Ford, Honda, Mazda, Nissan, Subaru, Toyota, Volkswagen.
As printed in Fastrack
In GCR, GTL Cars, create new sub chart as follows: In GTL change weights for unrestricted engines under 1399cc as follows: Alfa Romeo 1130cc 1605 1565 1290cc 1605 1565 1357cc 1605 1565 AMC/Renault 1289cc 1660 1619 Triumph Spitfire 1147cc 1530 1492 mini 1275cc 1570 1531
cars addedGTL Honda Fit 2009-13 2-door FWD classified with wheelbase options 94.0, 97.0, or 99.0 inches.
As printed in Fastrack
In GTL Honda Cars, classify Honda Fit as follows: GTL HONDA Cars - Model Years Body Style Drive-line Wheel-base (in) Notes FIT 2009-13 2 Dr. FWD 99.0 Alternate wheel bases 94.0” 97.0”
wordingSRF rain/brake light now requires Super Bright LEDs Inc. P/N PT-STRB-R24 with specific connector and rain light switch.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.W.l, change as follows: "A Super Bright LEDs Inc. rain / brake light comprised of a single standard trailer oval lamp, 2-1/4 inches x 6-1/2 inches, with incandescent or LED illumination, P/N PT-STRB-R24, is required in the original roll hoop mounting location. This rule supersedes GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No changes may be made to the original 3-pin connector on the wiring harness. The secondary filament of the brake light assembly shall must be connected to a switch enabling its use as a rain light."
wordingSRF requires Super Bright LEDs P/N PT-STRB-R24 rain/brake light with strobing capability and specific wiring.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.W.l, change as follows: "A Super Bright LEDs Inc. P/N PT-STRB-R24 (SCCA Enterprises P/N 180427A) rain / brake light, P/N PT-STRB-R24, is required in the original roll hoop mounting location. This rule supersedes GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No changes may be made to the original 3-pin connector on the wiring harness. An SCCA Enterprises P/N 1190503 Strobing Brake Light Pigtail is required. The secondary filament of the brake light assembly must be connected to a switch enabling its use as a strobing rain light. A Strobing Brake Light Kit P/N 1168003 is available, which includes the brake light and pigtail."
wordingGTL Mazda 12A rotary engines may machine and use 13B housing to O.E. 12A specifications.
As printed in Fastrack
In GT3 Engines - Mazda Spec Lines, add to Notes as follows: 12A Street Port: "Contact National Office for specific details of various allowable port configurations. May machine and use 13B housing to O.E. 12A spec’s." 12A Bridge Port: "Optional choke size 42mm @2010lbs. May machine and use 13B housing to O.E. 12A spec’s." 12A Peripheral Port @ 2150lbs: "May machine and use 13B housing to O.E. 12A spec’s." 12A Peripheral Port @ 2300lbs: "Disenfranchised GT2* May machine and use 13B housing to O.E. 12A spec’s."
In GTL Cars - TOYOTA Spec Lines, classify DR86 as follows: GTL Cars - TOYOTA Model Years Body Style Drive-line Wheel-base (in) Notes DR86 2021-2024 2 DR RWD 101.3
otherSRF adds brake duct and pedal extension rules, rear shift cable clamp option, camber limit to 5.0°, radiator opening height 3.5" ±0.5", and P2 engine restrictor changes.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.H, add the following: "NO MODIFICATIONS ALLOWED. Front brake ducts are required, attached to the openings in the lower radiator baffles, any flexible 4" duct material allowed, installed length minimum 12" maximum 36" in length. Must be securely fastened, Bracket Part # P/N 800368 can be used. Shall Must serve no other purpose. An extension may be welded to the side of the throttle pedal to improve heel-and-toe braking. Master cylinder casting / location must be used as delivered on P/N 180110 Pedal Mounting support. Aeroquip style -3 braided stainless flex lines only, must attach to all brake components without modification. Brake pad "anti-rattle" clips must be removed." In SRF, GCR section 9.1.8.D.1.V, add the following:
Show 23 more lines
"ii. Rear SADEV shift cable aluminum two-piece style clamp may be used. The P/N WM302007A clamp must serve no other purpose." In SRF, GCR section 9.1.8.D.1.X.k, add the following: "Negative camber shall must not exceed 5.0 degrees absolute maximum front and rear." In SRF, GCR section 9.1.8.D.1.AA.b, add the following: "2. Height of the radiator opening vertical surface 3 1/2“ +/- 1/2"." P2 Engine Table B.1 2008 and older Stock Suzuki, Yamaha, Honda, BMW 38.5mm P2 Engine Table B.2 Not required P2 Engine Table B.3 38.5mm Modified Engine 950 lbs. 1005cc max P2 Engine Table B.1 2008 and older 37mm P2 Engine Table B.2 Not required P2 Engine Table B.3 39mm Stock Engine 1050 lbs.
fasterGT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed.
As printed in Fastrack
In GCR Section 9.1.2.G (GTA Category Specifications), change as follows: “9.1.2.G.III.I The single-plane rear spoiler must be mounted at an angel angle from 50 to 75 degrees (perpendicular to the ground being 90 degrees) and may not extend beyond the rear bumper when viewed from directly above the rear bumper. Spoilers must be a minimum of .063 aluminum or Lexan and may vary in overall height to match the contours of the bodywork. The rear spoiler dimensions shall not exceed 59.0 inches wide by 5.0 inches in height, (measured on the material surface) , or 295.0 square inches total surface area. Braces to prevent spoiler deflection are allowed, but may serve no other purpose.”
fasterGT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors.
As printed in Fastrack
In GCR, Section 9.1.2.F.7.5.E. change as follows: “Direct Injection is not permitted only if it came OE and must be installed using only OE high pressure pump(s), hard and soft hoses and injectors.”
GTL GT2/3 remove Direction Injection not allowed in Spec line notes
fasterGT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E.
As printed in Fastrack
In GT2/3 modify Spec Line notes as follows: GT2: Nissan: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.” GT3: Mazda: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.” Mitsubishi 4G93: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E. ” Nissan QR25DE/DD 1988cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.” Nissan QE25DE/DD 2489cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta → Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta 2024-03-08 to 2025-03-07
slowerSRF wet tires: P185/60R13 H20/W2 option removed; P185/65R13 W2 front now required with P205/60R13 W2 rear.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.f, change as follows: "Wet: Front – Hoosier P/N 46100 P185/60R13 H20 or W2 Rear – Hoosier P/N 46105 P205/60R13 H20 or W2 Ground clearance is 2.5” with driver as raced when P185/60R13 (H20 or W2) tires are used. OR Front – Hoosier P/N 46101 P185/65R13 W2 Rear – Hoosier P/N 46105 P205/60R13 W2
Show 8 more lines
1. It is forbidden to regroove tires. 2. The use of tire warmers or cooling methods other than natural air convection or conduction is prohibited. The penalty for violation will be the loss of qualifying times and/or the disqualification of race results. 3. Hoosier SRF/SRF3 Decal Placement: Four (4) "Hoosier" decals are required in the following locations: Two (2) 11" X 3" decals on the vertical plane of the front nose to the outside of the cooling opening on each side and two (2) 18" X 5" decals, one on each side of the engine cover or above the rear wheel openings on the vertical plane. Hoosier decals are available, free of charge, from all Hoosier tire distributors including SCCA Enterprises."
wordingSMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification.
As printed in Fastrack
In GCR, Section 9.1.7.1.D.21., change as follows: "Cars running in Spec MX-5 must have a functioning video recorder/camera during all qualifying and race sessions as described in 9.3.11. Upon request by an SCCA official, competitors must provide their video recording/data, which may be used by the SCCA for any purpose including but not limited to rule enforcement and marketing. Failure to comply with a video request from an official, or having a non-functioning video recorder/camera may will be grounds for penalty or disqualification."
wordingSMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification.
As printed in Fastrack
In GCR, Section 9.1.7.1.D.21., change as follows: "Cars running in Spec MX-5 must have a functioning video recorder/camera during all qualifying and race sessions as described in 9.3.11. Upon request by an SCCA official, competitors must provide their video recording/data, which may be used by the SCCA for any purpose including but not limited to rule enforcement and marketing. Failure to comply with a video request from an official, or having a non-functioning video recorder/camera may will be grounds for penalty or disqualification."
wordingSMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance.
As printed in Fastrack
In GCR, Section 9.1.7.1.D.20., add the following: “e. All cars must run the latest AIM Data Logger Spec MX-5 ECU Protocol.” These specifications are part of the SCCA GCR and all automobiles shall conform to GCR Section 9. A. PURPOSE AND INTENT Spec MX-5 (SMX) is based on four pillars: affordability, reliability, tech-ability, and fun to drive, the (SMX) Spec MX-5 car provides the membership with the opportunity to compete in similarly prepared, low cost, 2006-2015 production-based MX- 5 car with limited modifications, intended to help deliver the most fair and competitive racing competition in SCCA Road
Show 660 more lines
Racing B. CLASSIFIED CARS AND WEIGHTS 2006-2015 production-based MX-5 Cars are to be weighed with the driver and required ballast. C. AUTHORIZED MODIFICATIONS Only the left-hand drive, North American-version of the 2006-2015 Mazda MX-5 convertible & power retractable hardtop (PRHT) are eligible. The original OE vehicle identification number (VIN) stamped on the firewall must correspond with the model year automobile as classified. VIN plates or stampings must remain in place, with the firewall VIN taking precedence. A Mazda Factory Shop Manual for the specific make, model, and year of automobile is required to be in the possession of each entrant. The manual may be in the form of printed material, microfiche, CDs, DVDs, and/ or Internet access to manufacturer sponsored web-based databases that is readily accessible at time of inspection. The manual is intended to aid scrutineers in identifying parts and the configuration of the automobile. The items outlined in this VTS document represent the only modifications and safety items permitted and/or required on Spec MX-5 vehicles other than safety items as required in SCCA’s current GCR Section 9. Parts and components may not perform an unauthorized function (i.e. Modifications must be stated as authorized or cannot be done). If the Mazda Factory Manual or these rules provide only a partial specification or no specification at all, the Mazda parts may not be modified beyond what is permitted in these rules. Compliance will be determined by comparison to new or like parts and/or the parts compliance measurement listing delivered by Mazda. Other approved parts with only a partial specification or no specification available in these rules may not be modified. Assembly, rebuild, and refurbishment procedures, and all associated dimensions must adhere to the published factory service procedures, except as otherwise stated in these rules. No components may be added or omitted from those specified by the published factory service procedures. All components must be comply with stated standard dimensions. It is permitted to use industry standard procedures to repair damaged components. The use of any painting, coating, plating, metal treatment process or impregnating substance (e.g., anti- friction, thermal barrier, oil shedding coatings, chrome, anodizing, REM, isotropic finishing, etc.) to any internal engine surface, internal axle components, internal transmission or differential surface, internal or external surfaces of the intake manifold, exhaust manifold or down tube, is prohibited. D. VEHICLE TECHNICAL SPECIFICATIONS (VTS) 1. Vehicle Weight a. The minimum vehicle weight with driver is 2,525.0 lb. 2. Ballast If ballast is required to meet the required minimum weight, it must be added as follows: a. A ballast base plate must be securely mounted using the factory OE passenger seat mounting bolt holes and bolts. Any number of additional segments of ballast may be attached to the base plate. b. Each segment of ballast must be fastened to the base plate with a minimum of two (2) one-half (1/2) inch bolts/studs and positive lock nuts of SAE Grade 5/ Metric 8.8 or better and must utilize large diameter, load distributing washers. In lieu of positive lock nuts it is permitted to positively thread the additional segments of weight into the base plate. c. Holes are not permitted to be drilled in the floor pan to mount ballast. 3. Chassis a. Towing eyes per SCCA’s current GCR Section 9.3 are required. There must be an arrow that strongly contrasts with the vehicle paint scheme pointing to each tow eyestrap. 9.1.7.1 SPEC MX-5 (SMX) b. All cars must use the front subframe PT# - NE51-34-800C c. All cars must use the rear subframe PT# - NE51-28-800B. d. OE strut tower brace is required; it is comprised of three (3) components; see Table 1 for part numbers. e. An engine to fender brace located on the passenger side of the engine bay may be used if mounted in such a way that it does not foul brake lines, fuel lines, or other systems that would interfere with the safe operation of the vehicle under race conditions – see Table 1 for allowed modifications. (Mazda Motorsports PT# 0000-07-5600) f. Disabling or removing of the door locking mechanism must be performed. g. To facilitate frequent lifting of the vehicle, a 3/4” boxed tube not to exceed 12” long may be added under the rocker panel inboard of the factory pinch weld flange on each side of the vehicle. h. Convertible tops/power retractable hard tops (PRHT) and attaching hardware must be completely removed. i. All chassis, structural, and electrical repairs, if performed, must be in conformity with factory procedures, specifications, and dimensions. Unless specifically authorized by the manufacturer for repair or permitted by these rules, no reinforcement (e.g., seam welding, material addition, etc.) is permitted. j. Removal of excess wiring is permitted provided it serves no other purpose and does not splice or interrupt the OE harnesses. Removal of the following systems is permitted: audio equip- ment; power seats; airbag/supplemental restraint systems components; heated seats; interior lighting; power windows; and power door locks. (No additional wiring may be added except as permitted in other sections - e.g., Section 16: Electrical Equipment.) Table 1: Strut Tower Brace Parts Description Mazda Part # Right Side of Strut Tower Brace NE57-56-48X Left Side of Strut Tower Brace NE57-56-49X Center Section of Strut Tower Brace NE57-56-48ZA k. A hole is permitted to be drilled in part #’s NE57-56-48X and NE57-56-49X to allow for access to the shock adjuster screw is permitted (it is recommended that the hole not be larger than 15mm); NE57-56-48X may be modified in order to allow room for the engine passenger side engine brace; no other modifications or other braces are permitted. l. MX-5 donor chassis with originally equipped with 16” OE wheels require installation of OE strut tower brace (part # NE57-56-35XA). m. To facilitate engine bay air flow for cooling purposes it is permitted to remove the section outlined below in red from OE PT# NE57-56- 35XA. Block-off plates must be installed at the fresh air vent for the HVAC module at the firewall under the cowl to isolate driver compart- ment from engine compartment. (FIREWALL BLOCKOFF PLATE 0000-07-5832) No additional modifications are permitted. 4. Body a. Interior and exterior door handles are required to remain operable. Alternate interior door handles or cord/strap are permitted. b. The driver’s and passenger’s side inner door structural panel may be removed to fit the cage. c. The stock side impact/anti-intrusion beam must not be modified or removed. d. Door locking mechanisms must be disabled or removed. e. A minimum of two (2) of the brake lights must be in working order per the current GCR Section 9.1. f. The two (2) OE unmodified, external mirrors for the correct the Mazda MX-5 (left and right) are required; they must be mounted in stock location and may not be modified. g. OE interior rearview mirror or an aftermarket rearview mirror must be used. h. 2006-2015 MX-5 bodywork may be updated or backdated, OE body parts only. (This includes Mazda OE accessory body parts such as trunk lid spoiler, side skirts, front air dam.) i. Mazda Motorsports’ fiberglass headlamp replacements may be used; (See table 2) no modifications or substitutions are permitted; exceptions: painting, covering, and wrapping. Table 2: Headlamp Replacement Covers Model Year Mazda Part # Description 2006-2008 0000-07-5818-LT Left Side 2006-2008 0000-07-5818-RT Right Side 2009-2015 0000-07-5819-LT Left Side 2009-2015 0000-07-5819-RT Right Side j. Lexan windshield may be used in place of the stock windshield. (Mazda Motorsports PT# - 0000-07-5101-5S) k. Windshield clips per current GCR Section 9.3 windshield clips are recommended. l. Hood and trunk pins or clips are permitted. Factory hood and trunk latches must remain intact and operational and may not be removed, disabled or altered. m. Front under hood weather strip must remain intact PT#- NE51-56-750 n. Rear under hood weather strip must remain intact PT#- NE51-56-760 o. Modification of release cables is permitted to facilitate external pull/opening straps/pulls/cords. p. A radiator screen of 0.125” minimum stainless-steel mesh may be added in front of the radiator. 1. The screen must be a single layer and must be installed to the bumper cover and or grill and be contained entirely within the bodywork of the vehicle. 2. Tape may be applied to the mesh screen. 3. The OE grill must remain intact. q. It is allowed to apply roll bar padding to the crash support bar (52-070) located behind the front bumper to prevent damage to the bumper. r. Front and rear fender lips may be rolled to prevent tire damage. s. Front OE fender liners must be intact and unmodified, except for what is allowed in section 13. J regarding brake ducts. Repairs due to on-track damage is allowed so long as it serves no other purpose. t. OE fog lights lens/glass must be removed. This will allow for the installation of brake duct kit (Mazda Motorsports’ part # 0000-03- 5301-NC.) The remaining opening from the fog light lens must either be blocked, or a connection must be made from the fog lamp opening/hole in the bumper fascia to a brake duct attached to the hub. u. Side marker lenses may be removed, and holes may be covered. v. OE hard top or the unmodified Mazda Motorsports hard top (part # 0000-07-5901-CC) are permitted. w. PRHT chassis cars must trim the finish panel with the 3rd brake light to fit one of the approved hard tops. 1. Hhardtops may be painted or wrapped. 2. OE hard top latches must be removed and replaced with positive fasteners. 3. The front of the hard top may attach to the upper windshield bar of the roll cage. 4. It is permitted to run one single piece of racer tape to cover the leading edge of the after- market hard top where it meets the factory windshield frame. 5. Openings beneath the hard top seal to the body are not permitted. The hard top must be securely mounted to the body of the vehicle and perform no other purpose. 6. Body repair must be performed to maintain stock body contours, lips, profiles, etc. body repair modification must not increase clearance. x. To improve driver’s exit through the window area, the driver and passenger vent window and vent window supporting frame may be removed as an assembly. 1. Vent windows may be modified to accept fresh air ducting. y. OE radio antennas may be removed. Antennas for two-way radios may be added. z. Insulation & undercoating may be removed. aa. All cars must run with both the front door windows fully open (i.e. fully down). 5. Cockpit / Trunk a. All interior trim components such as carpets, seats, cargo bins, seat belts, floor mat, firewall insu- lation/blanket, sound deadener patches, undercoating, radio systems, speakers, dome lights, grab handles, sun visors and their insulating and attaching materials, must be removed. Other than to provide for the installation of required safety equipment or other authorized modifications, no other driver/passenger compartment alterations or gutting are permitted. b. It is permitted to install a radio replacement panel. c. The outer edges of the dashboard may be cut the minimum amount required to install the roll cage. d. Air bag systems must be disarmed and must be removed. e. It is permitted to remove all components of the cruise control system. f. The top portion of the door panels containing the door latch release handle must remain intact. g. The lower portion of the door panels must be removed for installation of the roll cage. Gutting of the door may not go outside of the factory seal. h. The door window glass and window operating mechanisms must be removed. i. The OE dashboard and its attaching hardware and brackets must be retained. j. For installation of required safety equipment, however, it is permitted to modify the OE dash bar, so long as it is outboard of the first dash support brackets (illustration below). Modification of the first dash support brackets, nor inboard from them, is not permitted. The OE dash bar must be securely mounted. k. The HVAC control module located under the dash may be removed together with the following: blower motor, evaporator core, heater core and associated ducting. Once removed it is permitted to block the blower inlet passage on the firewall. l. All openings between the driver/passenger compartment and the trunk / gas tank area that include the filler tube & fuel tank vent must be filled completely with a metal bulkhead that is securely mounted (E.G. nuts/bolts, nut-serts, rivets). This shall close the entire trunk from the driver/ passenger compartment and comply with current GCR Section 9.3. m. Mazda Motorsports’ finish panel trim kit (part # 0000-07-5822) may be used to create the required bulkhead above n. It is permitted to remove the driver’s side factory seat mounts, but not the floor pan. o. It is permitted to remove the horn and all associated horn related components. p. OE driver’s seat must be replaced with a one-piece bucket-type race seat per current GCR Section 9.3. q. The passenger seat must be removed. r. Any steering wheel except wood rimmed types may be used. s. Any shift knob may be used. t. The air conditioning equipment located in the engine compartment (AC compressor assembly, associated lines/dryer and the condenser) must be removed. u. Alternate gauges and instruments may be added. The original instrument cluster must remain connected and functional However, it may be relocated to allow the mounting of an aftermarket dash such as an AiM. The wiring to relocate the dash may not be cut or extended, it may only be re-routed. The remainder of the dashboard or panel must remain intact. v. Modifications may be made to the foot pedals to improve the comfort and accessibility to the driver; relocation of mounting points is not permitted. 1. Dead pedal/footrest and heel stop may be added. w. Instrument clusters must be unmodified OE parts . x. Two-way radios may be used. y. Alternate means of windshield defrosting is permitted 6. Engine Modifications 6.1. General a. No modifications to the engine are permitted, except where specifically authorized within these rules. This includes but is not limited to: all fuel injection and engine management components, as well as electrical, cooling, and lubrication systems. b. All systems, unless otherwise stated, are subject to test procedures and must conform to OE specifications as stated in the Mazda Factory Service Manual. c. Permitted engine maintenance includes the replacement, but not modification, of external engine and engine systems parts. 1. No balancing, blue printing, lightening, polishing or other modification of moving parts of the engine is permitted. 2. All parts in the engine must be OE parts unless specified in this rule set. 3. For all Mazda part numbers in these specifications, superseding part numbers are consid- ered equivalent. d. Compression ratio for 2.0L engines must be 11.00:1; calculated using the official Spec MX-5 calculator. 6.2. Engine Block a. The engine block may be decked or milled to achieve the class specified compression ratio. Honing of cylinders is permitted to accommodate piston clearance so long as a maximum standard diameter is not exceeded shown in Table 3. b. The cylinders may be bored to accommodate piston clearance requirements so long as maximum permitted overbore diameter is not exceeded shown in Table 3 below. Table 3: Piston Sizes Piston Part # Bore Diameter Max Standard 0000-01-5310 87.6046mm (3.449”) Allowed Overbore (.020) 0000-01-5310-OS 88.1126mm (3.469”) c. It is not permitted to overbore a single cylinder; all cylinders must be bored equally. d. Sleeving of cylinders is not permitted. 6.3. Crankshaft a. OE Mazda MZR 2.0L (2009-2015) manual transmission crankshaft (part # LF9G-11-301) must be used with no modifications except for machining or polishing polishing and/or machining of the bearing surfaces to allow the use of main and rod bearings as permitted in Table 4 below. Table 4: Crankshaft Measurements easurement iameter Diameter b. OE crankshaft (Mazda part # LF9G-11-301) must weigh a minimum of 31.75lb. c. Maximum permitted stroke is as follows: 3.27” / 83.1mm d. Shot peening is prohibited. e. Bearings 1. Main and rod bearings must not be modified; coatings are not permitted. 2. OE bearings are permitted. 3. The only bearing sizes permitted other than OE are listed in see Table 5. Sizes Bearing Type Minimum Bearing Width Minimum Bearing Thickness Minimum Bearing Weight Part # Main Bearings (Standard H) .630” 0.097” N/A 0000-01-5215-MB Main Bearing (Standard HX) .630” 0.097” N/A 0000-01-5216-MB Rod Bearings (Standard H) .630” 0.057” 28g 0000-01-5213-RB Rod Bearing (Standard HX) .630” 0.057” 28g 0000-01-5214-RB f. The crank trigger must not be modified; it must be installed per the Mazda Factory Service Manual. g. OE crank pulley/balancer (Mazda part # LF94-11-400) must not be modified and must be installed per the Mazda Factory Service Manual. h. Knife edging of the crankshaft is not permitted. i. Modifications to the crankshaft counterweights are not permitted. j. Coatings, REM or metal treatments of any kind are not permitted. k. Alternate shifter bushing located at the bottom of the shift lever is allowed. 6.4. Connecting Rods a. OE Mazda MX-5 (2009-2015) manual transmission unmodified connecting rods (part # LF9G- 11-210) must be used. Connecting rod weight with cap and bolts must not be less than 530 grams. 6.5. Pistons a. Mazda Motorsports’ competition pistons (standard bore part # 0000-01-5310; oversized part # 0000-01-5310 OS) are required; no modification is permitted. b. The minimum weight of the piston, less wrist pin and hardware, must not be lighter than 290 grams. c. Mazda Motorsports’ competition wrist pin (part # 0000-01-5310-PN) must be used. d. The minimum weight of the wrist pin must not be lighter than 80 grams. e. Modification of the piston ring end gap width is permitted. 6.6. Cylinder Head a. Mazda Motorsports’ competition cylinder head (part # 0000-01-5300) must be used; no modi- fications to the cylinder head are permitted outside of the gasket face surface outlined below in Table 6. b. Intake runner CC volume is 182cc +/- 1cc. c. Exhaust runner CC volume is 114cc +/- 1cc. d. Combustion chamber volume may not be below 41cc. e. The gasket face of the cylinder head may be resurfaced provided the maximum allowed compression ratio is not exceeded. I. Surfacing of the head gasket surfaced must be in a flat plane. II. Cylinder head gasket surface distortion may not exceed .010mm or 0.004”. f. The minimum height of the cylinder head as measured must be at least (TBA) g. The following head gaskets in Table 6 below are permitted; no other gaskets may be used. Table 6: Head Gasket Measurements Description Thickness Mazda Part # OE Gasket 0.017” approximate crush depth L3G2-10-271A Competition Gasket 0.55mm (0.021”) 0000-01-5319-21 Competition Gasket 0.75mm (0.030”) 0000-01-5319-30 Competition Gasket 1.0mm (0.040”) 0000-01-5319-40 Competition Gasket 1.3mm (0.051”) 0000-01-5319-51 6.7. Camshaft and Camshaft Timing a. Camshafts must not be modified; see Table 7 for OE camshaft part numbers. Table 7: Camshaft part numbers Description Mazda Part # Intake Cam L3E3-12-420 Exhaust Cam L309-12-441B b. Camshaft and crankshaft sprockets must not be modified; see Table 8 for part numbers. shaft Sprocket Part #s t # 4X0C 425 c. Cam timing must not be altered; chain must be installed as stated in the Mazda Factory Service Manual. d. OE timing chain (Mazda part # LF7A-12-201) is required; no modification is permitted. e. OE timing chain components must be used; see Table 9 for Mazda part numbers. Table 9: Timing Chain Guide Part #s Description Mazda Part # Fixed Guide LF01-12-614 Tensioner Guide LF01-12-671 6.8. Valves a. OE valves must not be modified (including reshaping); see Table 10 for Mazda part numbers. le 10: Valve Part #s b. Valve location or angle must not be moved. c. Valve guides may not be replaced. d. Valve job measurements must be as follows: 1. Intake 35 top 45 seat 65 bottom 77 bottom seating angle width is 1.0mm 2. Exhaust 40 top 45 seating to radius seating angle width 1.2 mm. 3. Valve stem installed height must be per the Mazda Factory Service Manual. 4. Valve stem seals must be OE. 6.9. Valve Springs a. Mazda Motorsports’ competition valve springs (part # 0000-01-5319-SP) are required. 6.10. Intake Manifold a. OE intake manifold (Mazda part # LF9G-13-130B) is required; no modification is permitted (e.g., no material may be added or removed; no painting or coating on the exterior or interior permitted). b. All air entering the engine must pass through the throttle body and metered by the mass airflow sensor. c. Removal of these factory EGR components is permitted: Valve, crossover pipe, coolant lines (EGR DELETE KIT 0000-06-5447) d. If factory EGR components are removed, the following ports must be blocked: 1. Intake manifold cross over pipe port. 2. Cylinder head cross over pipe port. 3. EGR valve port on back of cylinder head. 6.11. Intake System a. Cars must replace OE air box with the Mazda competition cold air intake kit (part # 0000-06- 5150-KT); no modification (e.g., ducting or baffling of air, venturi cones) to the cold air intake kit is permitted. b. No alteration to the intake tube length, diameter, or shape is permitted. c. The air filter supplied in the Mazda Motorsports competition cold air intake kit may be refreshed with the Mazda Motorsports’ competition air filter (part # 0000-06-5204). 6.12. Fuel System a. Fuel must comply with SCCA GCR section 9.3.25 b. OE fuel pump (Mazda part # LFG1-13-350) is required; no modification is permitted. c. It is permitted to remove the unleaded fuel restrictor from the filler neck. (GCR 9.3.26) d. Mazda Motorsports’ competition fuel rail that includes fuel pressure gauge, and fuel sampling test port and hose kit (part # 0000-06-5207) is optional. 1. Fuel pressure sensor integrated into the required AIM data acquisition system is required. It must be operational and able to be viewed when pulling a competitor on track data. 2. The addition of a switch or jumper located in the under-hood fuse box is allowed to acti- vate the fuel pump. This modification may serve no other purpose. 3. One operational fuel sample test port is required. Fuel sample test ports shall be made from dry break fuel rated quick disconnects. No other style of fuel sample test port is allowed (e.g., Schrader valves). 4. No other modifications permitted. e. OE fuel pressure regulator (Mazda part # LFB6-13-280) is required. 1. Vehicle must run between 54 and 63 PSI of fuel pressure. f. OE injectors (Mazda part # L3G5-13-250) are required; no modification is permitted. 1. Flow rates for the injectors must fall within the factory tolerance of 204-216ml (204-216 cc, 12.5-13.1 cu in/minute). 6.13. Lubrication System a. OE engine oil filter is required; no substitutions permitted. b. OE oil pump PT# L310-14-100J is required and no modifications are permitted. c. Mazda Motorsports’ competition oil cooler adaptor kit with lines (part # 0000-01-5100KT) is required; no modification is permitted. d. Oil pressure sensor integrated into the required AIM data acquisition system is required. It must be operational and able to be viewed when pulling a competitor on track data. e. Oil and lubricants are unrestricted. 6.14. Engine Control Unit (ECU) a. Reference penalties for non-compliance of the Spec ECU flash in Section 21 below. Modifica- tion or attempted modification of the Spec ECU flash will result in a 12-month suspension from competition and $1,000.00 fine. b. Mazda Motorsports’ competition ECU (part # 0000-01-5379) is required; serial number must be visible; external or internal modification is not permitted. c. ECU calibrations and inputs must not be modified. d. OE engine electrical harness (part # NH18-67-020A) is required; no modification is permitted. e. OBDII diagnostics port must be operational in all cars. 1. The check engine light must be operational and perform the function test at start up. 2. The OBDII port must be available at all times (including during the race) for tech officials to install test equipment as necessary. 3. If a competitor uses the OBDII port to power any type of data acquisition system, he/she would be responsible for providing the splitter cable to plug in both units or unplug the data acquisition system. f. Instrument panel clusters must be operational and unmodified OE parts. g. Temporary data acquisition devices may be installed by the sanctioning body for technical compliance. h. Removal of Mazda ECU insulator PT# LFG1-13-3C1 is permitted (diagram below) 6.15. Miscellaneous a. The factory air conditioning system and all associated lines, compressor, condenser and evap- orator must be removed. 1. Once the AC compressor is removed, the OE AC pulley delete kit (Mazda part # LF17-15- 940E) is required. b. Serpentine belt Gates PT# 6PK-2170 or same size equivalent is required. 7. Exhaust a. OE exhaust manifold and OE heat shield must be replaced with Mazda Motorsports’ competi- tion part # 0000-06-5407-NC; no modification is permitted (e.g., internal or external wraps, coatings, paints, metal treatments, thermal barriers etc.). b. OE exhaust system must be replaced with Mazda Motorsports’ competition part # 0000-06- 5427-NC; no modification is permitted (e.g., internal or external wraps, coatings, paints, metal surface treatment, thermal barriers etc.). c. The forward oxygen (O2) sensor (OE Lambda Sensor) must remain in the factory location and in full working order. Mazda Motorsports’ competition O2 sensor installation kit wiring extender (part # 0000-10-5320) is permitted. d. The secondary post catalytic oxygen (O2) sensor must be removed. e. Heat shielding 1. OE heat shield protecting ABS unit from header may not be removed or modified. 2. OE muffler heat shield may not be removed or modified. 3. It is permitted to wrap the exhaust pipe from the mid connection flange to the muffler. (see red arrows in picture below) 4. Use of heat shielding material on transmission tunnel to replace OE heat shielding is permitted. OE heat shielding must be removed from transmission tunnel. (see diagram below) 8. Cooling System (cooling system checklist) a. Mazda Motorsports’ competition radiator and oil cooler assembly (part # 0000-01-5504-CR) is required (e.g., OE is not permitted). b. The radiator using the OE mounting brackets must be installed in its original location. c. The oil cooler may not be moved or altered from the pre-assembled mounting location. d. Radiator ducting may be placed on each side of the radiator tanks and the undertray to force air through the radiator fins. The gap between the top and sides of the radiator may be sealed but shall not perform any other function. e. The unmodified OE cooling fan must be maintained in full working order and mounted in the stock location. Axillary control of the radiator cooling fan may be added to activate the fan independent of the ECU, OE control of the fan must remain intact. f. Thermostats may be modified, removed or replaced. g. The OE water pump (Mazda part # 1F70-15-100) is required; no modification is permitted. h. The OE water pump pulley (Mazda part # L327-15-131) is required; no modification is permitted. i. Engine cooling system hoses and clamps may be substituted. j. The heater core may be removed along with HVAC evaporator core including all associated hard pipes and hoses. This is to include OE water to oil cooler lines as well as throttle body coolant lines. (Rear coolant pipe 0000-01-5514, bottom coolant pipe 0000- 01-5515) k. The OE engine coolant expansion tank may be replaced with any aftermarket part but and must not serve another purpose. 9. Clutch, Pressure Plate and Flywheel a. Vehicle may use any combination of the options listed in Table 11 below. Table 11: Clutch Component Part Numbers Description Mazda Part # Mazda Factory Clutch Disc LF05-16-460A ACT Sprung Clutch Disc 0000-02-5420-AC ACT Pressure Plate 0000-02-5405-AC ACT Clutch and PP Kit 0000-02-5004-G6 Mazda Factory Pressure Plate LF04-16-410A b. The unmodified pressure plate must be bolted directly to the stock, unmodified flywheel. c. OE flywheel (Mazda part # LF9G-11-500) is required. Factory Service Manual resurfacing specification is permitted; no other modification is permitted. d. Alternate clutch lines are permitted but must not serve another purpose. e. Clutch components must adhere to the minimum weights listed in Table 12 below: Table 12: Clutch Component Part Numbers Description Minimum Weight (lb.) Clutch disc 3.5 Pressure Plate 9.4 Flywheel 15.80 10. Transmission a. OE 2006-2015 6-speed gearbox and 4.10 final drive ratio are required. b. No modification of the internal parts and ratios are permitted except the installation of the unmodified parts contained in the Mazda Motorsports MX-5 transmission upgrade kit (part # 0000-02-5700). c. Mazda Motorsports Competition gear set 0000-02-6000 is allowed. Gear ratios are as follows: 1st - 3.82; 2nd - 2.26; 3rd - 1.64; 4th - 1.18; 5th - 1.00; 6th - 0.83/0.79. There are two (2) production 6th gears; either one is permitted. d. Alternate shift knobs are permitted. e. Nomex or aftermarket fireproof shift boots are permitted. Removal of the factory rubber shift boot is not permitted. f. No treating, coating, polishing or modification of any transmission or components are permitted. g. Fluids and/or lubricants may be substituted with any lubricant. h. Updating or backdating of transmissions from 2006–2015 is permitted; unmodified OE shifters must be retained. The use of short throw shifters is prohibited. i. An single inspection hole (not to exceed 1.5” in diameter) in the bottom of the bell housing is permitted for the sole purpose of technical inspection of the flywheel. It is permitted to plug or tape over theat hole. j. Transmission cooler(s) are permitted. 11. Differential a. Only the Following differentials are allowed. 1. Mazda Motorsports, unmodified, Torsen limited slip differential – 0000-02-5564 2. OE, unmodified, limited slip differential - Mazda part # MS03-27-200B 3. OE, unmodified, open differential are permitted. b. RX-8 differential mounting bracket (Mazda part # F151-39-730B) is permitted. c. Mazda Comp diff bushings 0000-04-5510 is permitted (MX-5 diff mount) d. Polishing, metal treatment or coating of differential or axle components are not permitted. e. Removal of metal/rubber isolator on the pinion flange is permitted. f. Differential cooler(s) are permitted. 12. Suspension and Steering: Suspension Modifications are limited to the addition of the Mazda Motorsports Spec MX-5 kit; details are as follows (including all modifications permitted): a. OE control arms are required; no modification is permitted. b. Mazda Motorsports’ TSB MX-5-002 must be followed re: the rear shock thread protector found in the “Spec MX-5: Four Pillars” page on MazdaMotorsports.com. The thread protector must measure 1.250”. (The TSB will not be applicable to the supply from Mazda Motorsports received after 7.15.2020 as they will have the updated thread protector.) c. Anti-roll bar links may be replaced with Mazda part # 0000-04-5597-KT 1. Cockpit adjustability is not permitted. d. Mazda Motorsports’ competition sway bars are required, mounting guidelines: 1. Metal shims up to 1/8” total thickness are permitted between each anti-roll bar mount shackle and the stock mounting point on the chassis. 2. One end of the sway bar(s) may be disconnected as a suspension tuning aid. 3. The bar must remain in place and be solidly attached to the suspension on one end. 4. Sway bar end links must be installed on the unmodified stock attachment points. e. Camber, caster, and toe are unrestricted within the limits of the unmodified factory adjust- ments in conjunction with Mazda Motorsports front offset bushing (part # 000-04-5407-NC). f. Minimum ride height is unrestricted. g. Nuts & bolts may be replaced by similar items performing the same fastening function(s). h. Relocation or reinforcement of any suspension parts or mounting points is not permitted, with the following exceptions: 1. Addition of spacers or washers on a horizontal plane is permitted at the rear lower shock mount to the spindle per the shock installation instructions. 2. Updating to RX-8 rear toe link and rear trailing arm is permitted. See Table 13 below. Table 13: Permitted RX-8 Trailing Arm and Toe Link Part #s Description Mazda Part # RX-8 Trailing Arm F189-28-200A RX-8 Toe Link F189-28-45XA i. OE power steering pump with pulley (Mazda part # NE51-32-650D) is required; Mazda Motor- sports Power steering flow restrictor PT#- 0000-04-5532 is permitted; no other modification is permitted. j. OE power steering rack (Mazda part #: NE51-32-110C) is required; no modification or reloca- tion is permitted. k. Factory power steering reservoir may be replaced. l. Wheel center caps must be removed. m. All chassis, structural and electrical repairs must follow factory procedures, specifications, and dimensions as described in the applicable service manual. Reinforcement (e.g., seam welding, material addition, etc.) is not permitted. n. Steering lock mechanisms must be removed. o. The distance from the outside of the wheel rim to outside of the opposing wheel rim for both the front and rear of the vehicle must not exceed 69.5”. I. The distance Measurement is obtained by measuring the distance between the wheel lips by going through the wheel spokes at the bottom of the wheel at its widest point via tape measure. (Measure the outside wheel lip of one wheel to outside wheel lip of the other wheel on same axle.) p. Mazda Motorsports’ competition rear toe link (part # 0000-04-5426) is permitted; no modification is permitted. q. Mazda Motorsport’s Spec MX-5 Suspension Kit includes the items set forth in Items in Table 14. seen below are components within this kit. No substitutions or modifications of parts are permitted. The unmodified kits must be used in their entirety, except as specified. Table 14: Spec MX-5 Suspension Kit (All parts are required; no modification is permitted.) Description Location Mazda Part # Shocks Front 0000-04-5291-SA Rear 0000-04-5292-SA Springs Front 0000-04-9700-08 Rear 0000-04-9400-07 Helper Springs Front/Rear 0000-04-9926 Front Penske Mount Kit Front 0000-04-5359 Rear Penske Mount Kit Rear 0000-04-5358 Sway Bar Kit Front and Rear 0000-04-5306-EB Offset Bushings Front 0000-04-5407-NC 13. Hubs a. OE RX-8 front hub (Mazda part # F189-33-04X) may be substituted in place of the OE Miata 2006-2015 front hub. b. Mazda Motorsports’ competition RX-8 rear hub upgrade kit (part # 0000-04-5811-KT) may be substituted in place of the OE MX- 5 rear hubs; this unmodified kit must be used in its entirety. c. OE RX-8 rear uprights, bearings, hubs, and hybrid axel may be used in place of OE MX-5 parts. 14. Brakes a. OE brake rotors must be used and adhere to the specifications below in Table 15. Table 15: Brake Rotor Dimensions Location Diameter Notes Front 290mm (11.4”) Vented Rear 280mm (11.0”) Solid Front backing plates/dirt shields may be removed. (see see red arrow in diagram below) b. Rear backing plates/dirt shields may be removed. (see red arrow in diagram below) c. Brake lines may be replaced with competition braided steel lines; option: Mazda Motorsports’ part # 0000-03-5212. d. The Factory ABS system must remain intact, unmodified, and in full working order. e. Brake slider pin may be used in either/both front location B25D-33-694. (This prevents a stuck sliding caliper due to the rubber grommet) f. Parking brake mechanisms and actuating components may be removed. g. Brake fluid is unrestricted. h. Mazda Motorsports’ competition brake duct kit (part # 0000-03-5301) is permitted. i. The forward vertical inner fender panels may be modified to fit the brake kit hose to the fog light openings but may not be modified to serve any additional purpose. j. Mazda Motorsports’ competition brake pads are required; see eligible brake pad compounds in Table 16. No other brake pads are permitted. Table 16: Brake Pad part numbers Pad Style Mazda Part # Notes Front Pad 0000-03-5104-SP RST-3 compound Rear Pad 0000-03-5116-29 RSL-29 compound 15. Wheels The following unmodified wheel options below in Table 17 are permitted for use. Table 17: WHEELS Description Color Mazda Part # 17x7” OE Wheel Gun Metallic 99656-47070 17x7” OE Wheel Silver 99656-77070 Mazda Motorsports’ Competition MX-5 Wheel Gun Metallic 0000-04-5706-GM Mazda Motorsports’ Competition MX-5 Wheel Silver 0000-04-5706-SL a. Wheels may be painted. b. Aftermarket (any) wheel studs and lug nuts are permitted., provided that a minimum of two he threads must protrude beyond the lug nut with the wheel installed with a minimum of two (2) full threads showing; Wheel studs may not be gun drilled. c. Wheel spacers are not permitted. 16. Tires a. Dry tires: Toyo RR P235/40/ZR17 b. Wet tires: Toyo RA1 P235/40/ZR17. 17. Electrical Equipment a. OE ignition coils (Mazda part # L3G2-18-100B) are required; no modification is permitted. b. Mazda’s competition spark plugs (part # 0000-10-R7IX-11) are required; no modification is permitted. c. The crankshaft position sensor and crankshaft pulley relationship must be as specified in the 2006- 2015 MX-5 Factory Service Manual. d. One of the two OE alternators (Mazda part # LF9H-18-300R-OA, L3P9-18-300D) is required; no modification is permitted. e. The alternator must not be externally regulated or disabled in any way other than by the OE production ECU/wiring circuit and master kill switch. f. The electronic control module (ECM) control circuit for alternator charging must be OE - unmodified and operational. g. One of the two OE alternator drive pulley part # AJ51-18-W10 (60mm), Part# L813-18- W11(55mm) is required; no modification is permitted. h. All sensors related to engine operating parameters must be used and must be stock, unmodi- fied Mazda parts for the correct year of the vehicle on which they are installed. i. Any and all sensors and their respective locations, mounts, and wiring harness leads may not be altered except as elsewhere in this rule set. e Spec-MX-5 rules. j. Any sensors required for non-OE gauges must be in addition to the Mazda sensors. k. All alternate gauge and sensors must have independent wiring. Splicing, tapping, or altering of the factory engine wiring harnesses is prohibited with the exception of adding an aftermarket tachom- eter/shift light as follows: 1. It is permitted to splice into the yellow wire with the black stripe (pin 2BA - Ignition Coil 1 control circuit) in the engine harness to obtain the tachometer signal for an aftermarket tachometer or shift light. 2. Splicing must be done within 5” of the ECU. l. Data acquisition’s sensor(s) may be added, provided they do not require splicing or alteration to the factory engine wiring harness. m. Batteries 1. Batteries may be replaced with those of an alternate manufacturer, provided they are of similar amp-hour capacity, and size, including lead acid or AGM.; lLithium batteries are not permitted. 2. Batteries must weigh no less than 18.0lb and no more than 35.0lb 3. Additional battery hold-down devices are recommended. 4. Battery MUST be moved from the original location to the passenger side in the upper trunk area in front of the tail lamp. This will require the use of a bulkhead that separates the driver / passenger compartment completely from the trunk and the battery location. See section 5.I for reference. 18. Roll Cage a. Roll cage must adhere to SCCA’s current GCR Section 9.4 for Touring 4 cars; with the following exceptions: 1. One tube not to exceed 1.75” in diameter may be added which extends from the door bars to the rocker panel on each side. The landing plate for this tube can be no longer than 5” in length. The landing plates must be centered between the front and rear landing plates for the lower NASCAR or X brace bar. 2. Main hoop mounting plates may be on multiple planes; however, they must not be greater than 19” on any side. b. Playboy MX-5 Cup car cages manufactured by Racing Cages, Inc. with the official serial number plate on the main hoop are allowed to retain the lower door bar and two 3” attachment points to the rocker panel on both the driver’s side and passenger side. No additional seam welding or lengthening of the original attachment points is allowed. 19. Safety a. An electrical master (“kill”) switch is required. See current GCR Section 9.3 Master Switch. b. Vehicle must be equipped with a driver’s restraint system meeting the specifications of current GCR Section 9.3 Drivers Restraint System. c. Installation of a fire extinguisher or fire system is required. See current GCR 9.3 Fire System. d. Vehicle must have a driver’s side window safety net complying with current GCR Section 9.3 Window Safety Nets. Nets must be mounted to provide protection in the event the driver’s door opens. 20. Data Acquisition 1 A technical evaluation process for cars is available from the Series. Part of this process is the required download of AiM Data files after each timed session (Qualifying 1 & 2, Races 1 & 2). Within 30 minutes of each timed session end, all Series Competitors MUST send the AiM Data file (.XRK) for all timed laps of that session to the secure email address (data@specmx-5.com), where data will be reviewed by AiM directly. Failure to adhere to this guideline from the Series, or having non- functioning data, may be grounds for penalty or disqualification by the Series. a. Vehicle must be equipped with current generation AiM data acquisition system (configurable in Race Studio 3) that can provide on track data to AiM race studio 3. The data acquisition system may only read the OBDII/ECU data stream. It is not permitted to alter/manipulate data to and from the ECU. The AiM system may be utilized to trigger a switch I.E., cooling fans or diff cooler pumps but must be wired via a separate analog circuit. Refer to Section 17: Electrical Equipment above for installation requirements. b. The connection at the OBDII port for the AiM system may be made in either one of two ways: 1. Through a dedicated OBDII AiM adaptor. 2. By direct wiring to the back of the OBDII port within 3” of the ODBII connector. c. Fuel pressure datalogging is required. d. Oil pressure datalogging is required. e. All cars must run the latest AIM Data Logger Spec MX-5 ECU Protocol 21. Mandatory Video Camera Cars running in Spec MX-5 must have a functioning video recorder/camera during all qualifying and race sessions as described in 9.3.11. Upon request by an SCCA official, competitors must provide their video recording/data, which may be used by the SCCA for any purpose including but not limited to rule enforcement and marketing. Failure to comply with a video request from an official, or having a non-functioning video recorder/camera may will be grounds for penalty or disqualification. 22. Parts Confiscation a. Tech officials may confiscate competitors’ parts for the purpose of verification of tech compliance. 23. Penalties Clarification – Non-Compliant Parts Level Infraction Penalty 1 Non-compliant modification to any of the spec parts, engine components, ECU/Elec- tronics or modification to the chassis. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 12 months following the suspension. A level 1 infraction carries a $1,000 fine. 2 Non-compliant modification to the suspen- sion or drivetrain outside of level one infrac- tions: engine, fuel system, charging system, exhaust, and intake system. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 6 months following the suspension. A level 2 infraction carries a $500 fine. 3 Use of an unauthorized or non-compliant part, engine component, ECU/Electronics or chassis or chassis part. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 12 months following the suspension. A level 3 infraction carries a $1,000 fine 4 Non-compliance (non-modification such as incorrect part)Use of an unauthorized or non- compliant for any of the suspension or drive- train part or component outside of level one infractions: engine, fuel system, charging system, exhaust, and intake system. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 6 months following the suspension. A level 4 infraction carries a $500 fine
wordingSMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance.
As printed in Fastrack
In GCR, Section 9.1.7.1.D.20., add the following: “e. All cars must run the latest AIM Data Logger Spec MX-5 ECU Protocol.” These specifications are part of the SCCA GCR and all automobiles shall conform to GCR Section 9. A. PURPOSE AND INTENT Spec MX-5 (SMX) is based on four pillars: affordability, reliability, tech-ability, and fun to drive, the (SMX) Spec MX-5 car provides the membership with the opportunity to compete in similarly prepared, low cost, 2006-2015 production-based MX- 5 car with limited modifications, intended to help deliver the most fair and competitive racing competition in SCCA Road
Show 660 more lines
Racing B. CLASSIFIED CARS AND WEIGHTS 2006-2015 production-based MX-5 Cars are to be weighed with the driver and required ballast. C. AUTHORIZED MODIFICATIONS Only the left-hand drive, North American-version of the 2006-2015 Mazda MX-5 convertible & power retractable hardtop (PRHT) are eligible. The original OE vehicle identification number (VIN) stamped on the firewall must correspond with the model year automobile as classified. VIN plates or stampings must remain in place, with the firewall VIN taking precedence. A Mazda Factory Shop Manual for the specific make, model, and year of automobile is required to be in the possession of each entrant. The manual may be in the form of printed material, microfiche, CDs, DVDs, and/ or Internet access to manufacturer sponsored web-based databases that is readily accessible at time of inspection. The manual is intended to aid scrutineers in identifying parts and the configuration of the automobile. The items outlined in this VTS document represent the only modifications and safety items permitted and/or required on Spec MX-5 vehicles other than safety items as required in SCCA’s current GCR Section 9. Parts and components may not perform an unauthorized function (i.e. Modifications must be stated as authorized or cannot be done). If the Mazda Factory Manual or these rules provide only a partial specification or no specification at all, the Mazda parts may not be modified beyond what is permitted in these rules. Compliance will be determined by comparison to new or like parts and/or the parts compliance measurement listing delivered by Mazda. Other approved parts with only a partial specification or no specification available in these rules may not be modified. Assembly, rebuild, and refurbishment procedures, and all associated dimensions must adhere to the published factory service procedures, except as otherwise stated in these rules. No components may be added or omitted from those specified by the published factory service procedures. All components must be comply with stated standard dimensions. It is permitted to use industry standard procedures to repair damaged components. The use of any painting, coating, plating, metal treatment process or impregnating substance (e.g., anti- friction, thermal barrier, oil shedding coatings, chrome, anodizing, REM, isotropic finishing, etc.) to any internal engine surface, internal axle components, internal transmission or differential surface, internal or external surfaces of the intake manifold, exhaust manifold or down tube, is prohibited. D. VEHICLE TECHNICAL SPECIFICATIONS (VTS) 1. Vehicle Weight a. The minimum vehicle weight with driver is 2,525.0 lb. 2. Ballast If ballast is required to meet the required minimum weight, it must be added as follows: a. A ballast base plate must be securely mounted using the factory OE passenger seat mounting bolt holes and bolts. Any number of additional segments of ballast may be attached to the base plate. b. Each segment of ballast must be fastened to the base plate with a minimum of two (2) one-half (1/2) inch bolts/studs and positive lock nuts of SAE Grade 5/ Metric 8.8 or better and must utilize large diameter, load distributing washers. In lieu of positive lock nuts it is permitted to positively thread the additional segments of weight into the base plate. c. Holes are not permitted to be drilled in the floor pan to mount ballast. 3. Chassis a. Towing eyes per SCCA’s current GCR Section 9.3 are required. There must be an arrow that strongly contrasts with the vehicle paint scheme pointing to each tow eyestrap. 9.1.7.1 SPEC MX-5 (SMX) b. All cars must use the front subframe PT# - NE51-34-800C c. All cars must use the rear subframe PT# - NE51-28-800B. d. OE strut tower brace is required; it is comprised of three (3) components; see Table 1 for part numbers. e. An engine to fender brace located on the passenger side of the engine bay may be used if mounted in such a way that it does not foul brake lines, fuel lines, or other systems that would interfere with the safe operation of the vehicle under race conditions – see Table 1 for allowed modifications. (Mazda Motorsports PT# 0000-07-5600) f. Disabling or removing of the door locking mechanism must be performed. g. To facilitate frequent lifting of the vehicle, a 3/4” boxed tube not to exceed 12” long may be added under the rocker panel inboard of the factory pinch weld flange on each side of the vehicle. h. Convertible tops/power retractable hard tops (PRHT) and attaching hardware must be completely removed. i. All chassis, structural, and electrical repairs, if performed, must be in conformity with factory procedures, specifications, and dimensions. Unless specifically authorized by the manufacturer for repair or permitted by these rules, no reinforcement (e.g., seam welding, material addition, etc.) is permitted. j. Removal of excess wiring is permitted provided it serves no other purpose and does not splice or interrupt the OE harnesses. Removal of the following systems is permitted: audio equip- ment; power seats; airbag/supplemental restraint systems components; heated seats; interior lighting; power windows; and power door locks. (No additional wiring may be added except as permitted in other sections - e.g., Section 16: Electrical Equipment.) Table 1: Strut Tower Brace Parts Description Mazda Part # Right Side of Strut Tower Brace NE57-56-48X Left Side of Strut Tower Brace NE57-56-49X Center Section of Strut Tower Brace NE57-56-48ZA k. A hole is permitted to be drilled in part #’s NE57-56-48X and NE57-56-49X to allow for access to the shock adjuster screw is permitted (it is recommended that the hole not be larger than 15mm); NE57-56-48X may be modified in order to allow room for the engine passenger side engine brace; no other modifications or other braces are permitted. l. MX-5 donor chassis with originally equipped with 16” OE wheels require installation of OE strut tower brace (part # NE57-56-35XA). m. To facilitate engine bay air flow for cooling purposes it is permitted to remove the section outlined below in red from OE PT# NE57-56- 35XA. Block-off plates must be installed at the fresh air vent for the HVAC module at the firewall under the cowl to isolate driver compart- ment from engine compartment. (FIREWALL BLOCKOFF PLATE 0000-07-5832) No additional modifications are permitted. 4. Body a. Interior and exterior door handles are required to remain operable. Alternate interior door handles or cord/strap are permitted. b. The driver’s and passenger’s side inner door structural panel may be removed to fit the cage. c. The stock side impact/anti-intrusion beam must not be modified or removed. d. Door locking mechanisms must be disabled or removed. e. A minimum of two (2) of the brake lights must be in working order per the current GCR Section 9.1. f. The two (2) OE unmodified, external mirrors for the correct the Mazda MX-5 (left and right) are required; they must be mounted in stock location and may not be modified. g. OE interior rearview mirror or an aftermarket rearview mirror must be used. h. 2006-2015 MX-5 bodywork may be updated or backdated, OE body parts only. (This includes Mazda OE accessory body parts such as trunk lid spoiler, side skirts, front air dam.) i. Mazda Motorsports’ fiberglass headlamp replacements may be used; (See table 2) no modifications or substitutions are permitted; exceptions: painting, covering, and wrapping. Table 2: Headlamp Replacement Covers Model Year Mazda Part # Description 2006-2008 0000-07-5818-LT Left Side 2006-2008 0000-07-5818-RT Right Side 2009-2015 0000-07-5819-LT Left Side 2009-2015 0000-07-5819-RT Right Side j. Lexan windshield may be used in place of the stock windshield. (Mazda Motorsports PT# - 0000-07-5101-5S) k. Windshield clips per current GCR Section 9.3 windshield clips are recommended. l. Hood and trunk pins or clips are permitted. Factory hood and trunk latches must remain intact and operational and may not be removed, disabled or altered. m. Front under hood weather strip must remain intact PT#- NE51-56-750 n. Rear under hood weather strip must remain intact PT#- NE51-56-760 o. Modification of release cables is permitted to facilitate external pull/opening straps/pulls/cords. p. A radiator screen of 0.125” minimum stainless-steel mesh may be added in front of the radiator. 1. The screen must be a single layer and must be installed to the bumper cover and or grill and be contained entirely within the bodywork of the vehicle. 2. Tape may be applied to the mesh screen. 3. The OE grill must remain intact. q. It is allowed to apply roll bar padding to the crash support bar (52-070) located behind the front bumper to prevent damage to the bumper. r. Front and rear fender lips may be rolled to prevent tire damage. s. Front OE fender liners must be intact and unmodified, except for what is allowed in section 13. J regarding brake ducts. Repairs due to on-track damage is allowed so long as it serves no other purpose. t. OE fog lights lens/glass must be removed. This will allow for the installation of brake duct kit (Mazda Motorsports’ part # 0000-03- 5301-NC.) The remaining opening from the fog light lens must either be blocked, or a connection must be made from the fog lamp opening/hole in the bumper fascia to a brake duct attached to the hub. u. Side marker lenses may be removed, and holes may be covered. v. OE hard top or the unmodified Mazda Motorsports hard top (part # 0000-07-5901-CC) are permitted. w. PRHT chassis cars must trim the finish panel with the 3rd brake light to fit one of the approved hard tops. 1. Hhardtops may be painted or wrapped. 2. OE hard top latches must be removed and replaced with positive fasteners. 3. The front of the hard top may attach to the upper windshield bar of the roll cage. 4. It is permitted to run one single piece of racer tape to cover the leading edge of the after- market hard top where it meets the factory windshield frame. 5. Openings beneath the hard top seal to the body are not permitted. The hard top must be securely mounted to the body of the vehicle and perform no other purpose. 6. Body repair must be performed to maintain stock body contours, lips, profiles, etc. body repair modification must not increase clearance. x. To improve driver’s exit through the window area, the driver and passenger vent window and vent window supporting frame may be removed as an assembly. 1. Vent windows may be modified to accept fresh air ducting. y. OE radio antennas may be removed. Antennas for two-way radios may be added. z. Insulation & undercoating may be removed. aa. All cars must run with both the front door windows fully open (i.e. fully down). 5. Cockpit / Trunk a. All interior trim components such as carpets, seats, cargo bins, seat belts, floor mat, firewall insu- lation/blanket, sound deadener patches, undercoating, radio systems, speakers, dome lights, grab handles, sun visors and their insulating and attaching materials, must be removed. Other than to provide for the installation of required safety equipment or other authorized modifications, no other driver/passenger compartment alterations or gutting are permitted. b. It is permitted to install a radio replacement panel. c. The outer edges of the dashboard may be cut the minimum amount required to install the roll cage. d. Air bag systems must be disarmed and must be removed. e. It is permitted to remove all components of the cruise control system. f. The top portion of the door panels containing the door latch release handle must remain intact. g. The lower portion of the door panels must be removed for installation of the roll cage. Gutting of the door may not go outside of the factory seal. h. The door window glass and window operating mechanisms must be removed. i. The OE dashboard and its attaching hardware and brackets must be retained. j. For installation of required safety equipment, however, it is permitted to modify the OE dash bar, so long as it is outboard of the first dash support brackets (illustration below). Modification of the first dash support brackets, nor inboard from them, is not permitted. The OE dash bar must be securely mounted. k. The HVAC control module located under the dash may be removed together with the following: blower motor, evaporator core, heater core and associated ducting. Once removed it is permitted to block the blower inlet passage on the firewall. l. All openings between the driver/passenger compartment and the trunk / gas tank area that include the filler tube & fuel tank vent must be filled completely with a metal bulkhead that is securely mounted (E.G. nuts/bolts, nut-serts, rivets). This shall close the entire trunk from the driver/ passenger compartment and comply with current GCR Section 9.3. m. Mazda Motorsports’ finish panel trim kit (part # 0000-07-5822) may be used to create the required bulkhead above n. It is permitted to remove the driver’s side factory seat mounts, but not the floor pan. o. It is permitted to remove the horn and all associated horn related components. p. OE driver’s seat must be replaced with a one-piece bucket-type race seat per current GCR Section 9.3. q. The passenger seat must be removed. r. Any steering wheel except wood rimmed types may be used. s. Any shift knob may be used. t. The air conditioning equipment located in the engine compartment (AC compressor assembly, associated lines/dryer and the condenser) must be removed. u. Alternate gauges and instruments may be added. The original instrument cluster must remain connected and functional However, it may be relocated to allow the mounting of an aftermarket dash such as an AiM. The wiring to relocate the dash may not be cut or extended, it may only be re-routed. The remainder of the dashboard or panel must remain intact. v. Modifications may be made to the foot pedals to improve the comfort and accessibility to the driver; relocation of mounting points is not permitted. 1. Dead pedal/footrest and heel stop may be added. w. Instrument clusters must be unmodified OE parts . x. Two-way radios may be used. y. Alternate means of windshield defrosting is permitted 6. Engine Modifications 6.1. General a. No modifications to the engine are permitted, except where specifically authorized within these rules. This includes but is not limited to: all fuel injection and engine management components, as well as electrical, cooling, and lubrication systems. b. All systems, unless otherwise stated, are subject to test procedures and must conform to OE specifications as stated in the Mazda Factory Service Manual. c. Permitted engine maintenance includes the replacement, but not modification, of external engine and engine systems parts. 1. No balancing, blue printing, lightening, polishing or other modification of moving parts of the engine is permitted. 2. All parts in the engine must be OE parts unless specified in this rule set. 3. For all Mazda part numbers in these specifications, superseding part numbers are consid- ered equivalent. d. Compression ratio for 2.0L engines must be 11.00:1; calculated using the official Spec MX-5 calculator. 6.2. Engine Block a. The engine block may be decked or milled to achieve the class specified compression ratio. Honing of cylinders is permitted to accommodate piston clearance so long as a maximum standard diameter is not exceeded shown in Table 3. b. The cylinders may be bored to accommodate piston clearance requirements so long as maximum permitted overbore diameter is not exceeded shown in Table 3 below. Table 3: Piston Sizes Piston Part # Bore Diameter Max Standard 0000-01-5310 87.6046mm (3.449”) Allowed Overbore (.020) 0000-01-5310-OS 88.1126mm (3.469”) c. It is not permitted to overbore a single cylinder; all cylinders must be bored equally. d. Sleeving of cylinders is not permitted. 6.3. Crankshaft a. OE Mazda MZR 2.0L (2009-2015) manual transmission crankshaft (part # LF9G-11-301) must be used with no modifications except for machining or polishing polishing and/or machining of the bearing surfaces to allow the use of main and rod bearings as permitted in Table 4 below. Table 4: Crankshaft Measurements easurement iameter Diameter b. OE crankshaft (Mazda part # LF9G-11-301) must weigh a minimum of 31.75lb. c. Maximum permitted stroke is as follows: 3.27” / 83.1mm d. Shot peening is prohibited. e. Bearings 1. Main and rod bearings must not be modified; coatings are not permitted. 2. OE bearings are permitted. 3. The only bearing sizes permitted other than OE are listed in see Table 5. Sizes Bearing Type Minimum Bearing Width Minimum Bearing Thickness Minimum Bearing Weight Part # Main Bearings (Standard H) .630” 0.097” N/A 0000-01-5215-MB Main Bearing (Standard HX) .630” 0.097” N/A 0000-01-5216-MB Rod Bearings (Standard H) .630” 0.057” 28g 0000-01-5213-RB Rod Bearing (Standard HX) .630” 0.057” 28g 0000-01-5214-RB f. The crank trigger must not be modified; it must be installed per the Mazda Factory Service Manual. g. OE crank pulley/balancer (Mazda part # LF94-11-400) must not be modified and must be installed per the Mazda Factory Service Manual. h. Knife edging of the crankshaft is not permitted. i. Modifications to the crankshaft counterweights are not permitted. j. Coatings, REM or metal treatments of any kind are not permitted. k. Alternate shifter bushing located at the bottom of the shift lever is allowed. 6.4. Connecting Rods a. OE Mazda MX-5 (2009-2015) manual transmission unmodified connecting rods (part # LF9G- 11-210) must be used. Connecting rod weight with cap and bolts must not be less than 530 grams. 6.5. Pistons a. Mazda Motorsports’ competition pistons (standard bore part # 0000-01-5310; oversized part # 0000-01-5310 OS) are required; no modification is permitted. b. The minimum weight of the piston, less wrist pin and hardware, must not be lighter than 290 grams. c. Mazda Motorsports’ competition wrist pin (part # 0000-01-5310-PN) must be used. d. The minimum weight of the wrist pin must not be lighter than 80 grams. e. Modification of the piston ring end gap width is permitted. 6.6. Cylinder Head a. Mazda Motorsports’ competition cylinder head (part # 0000-01-5300) must be used; no modi- fications to the cylinder head are permitted outside of the gasket face surface outlined below in Table 6. b. Intake runner CC volume is 182cc +/- 1cc. c. Exhaust runner CC volume is 114cc +/- 1cc. d. Combustion chamber volume may not be below 41cc. e. The gasket face of the cylinder head may be resurfaced provided the maximum allowed compression ratio is not exceeded. I. Surfacing of the head gasket surfaced must be in a flat plane. II. Cylinder head gasket surface distortion may not exceed .010mm or 0.004”. f. The minimum height of the cylinder head as measured must be at least (TBA) g. The following head gaskets in Table 6 below are permitted; no other gaskets may be used. Table 6: Head Gasket Measurements Description Thickness Mazda Part # OE Gasket 0.017” approximate crush depth L3G2-10-271A Competition Gasket 0.55mm (0.021”) 0000-01-5319-21 Competition Gasket 0.75mm (0.030”) 0000-01-5319-30 Competition Gasket 1.0mm (0.040”) 0000-01-5319-40 Competition Gasket 1.3mm (0.051”) 0000-01-5319-51 6.7. Camshaft and Camshaft Timing a. Camshafts must not be modified; see Table 7 for OE camshaft part numbers. Table 7: Camshaft part numbers Description Mazda Part # Intake Cam L3E3-12-420 Exhaust Cam L309-12-441B b. Camshaft and crankshaft sprockets must not be modified; see Table 8 for part numbers. shaft Sprocket Part #s t # 4X0C 425 c. Cam timing must not be altered; chain must be installed as stated in the Mazda Factory Service Manual. d. OE timing chain (Mazda part # LF7A-12-201) is required; no modification is permitted. e. OE timing chain components must be used; see Table 9 for Mazda part numbers. Table 9: Timing Chain Guide Part #s Description Mazda Part # Fixed Guide LF01-12-614 Tensioner Guide LF01-12-671 6.8. Valves a. OE valves must not be modified (including reshaping); see Table 10 for Mazda part numbers. le 10: Valve Part #s b. Valve location or angle must not be moved. c. Valve guides may not be replaced. d. Valve job measurements must be as follows: 1. Intake 35 top 45 seat 65 bottom 77 bottom seating angle width is 1.0mm 2. Exhaust 40 top 45 seating to radius seating angle width 1.2 mm. 3. Valve stem installed height must be per the Mazda Factory Service Manual. 4. Valve stem seals must be OE. 6.9. Valve Springs a. Mazda Motorsports’ competition valve springs (part # 0000-01-5319-SP) are required. 6.10. Intake Manifold a. OE intake manifold (Mazda part # LF9G-13-130B) is required; no modification is permitted (e.g., no material may be added or removed; no painting or coating on the exterior or interior permitted). b. All air entering the engine must pass through the throttle body and metered by the mass airflow sensor. c. Removal of these factory EGR components is permitted: Valve, crossover pipe, coolant lines (EGR DELETE KIT 0000-06-5447) d. If factory EGR components are removed, the following ports must be blocked: 1. Intake manifold cross over pipe port. 2. Cylinder head cross over pipe port. 3. EGR valve port on back of cylinder head. 6.11. Intake System a. Cars must replace OE air box with the Mazda competition cold air intake kit (part # 0000-06- 5150-KT); no modification (e.g., ducting or baffling of air, venturi cones) to the cold air intake kit is permitted. b. No alteration to the intake tube length, diameter, or shape is permitted. c. The air filter supplied in the Mazda Motorsports competition cold air intake kit may be refreshed with the Mazda Motorsports’ competition air filter (part # 0000-06-5204). 6.12. Fuel System a. Fuel must comply with SCCA GCR section 9.3.25 b. OE fuel pump (Mazda part # LFG1-13-350) is required; no modification is permitted. c. It is permitted to remove the unleaded fuel restrictor from the filler neck. (GCR 9.3.26) d. Mazda Motorsports’ competition fuel rail that includes fuel pressure gauge, and fuel sampling test port and hose kit (part # 0000-06-5207) is optional. 1. Fuel pressure sensor integrated into the required AIM data acquisition system is required. It must be operational and able to be viewed when pulling a competitor on track data. 2. The addition of a switch or jumper located in the under-hood fuse box is allowed to acti- vate the fuel pump. This modification may serve no other purpose. 3. One operational fuel sample test port is required. Fuel sample test ports shall be made from dry break fuel rated quick disconnects. No other style of fuel sample test port is allowed (e.g., Schrader valves). 4. No other modifications permitted. e. OE fuel pressure regulator (Mazda part # LFB6-13-280) is required. 1. Vehicle must run between 54 and 63 PSI of fuel pressure. f. OE injectors (Mazda part # L3G5-13-250) are required; no modification is permitted. 1. Flow rates for the injectors must fall within the factory tolerance of 204-216ml (204-216 cc, 12.5-13.1 cu in/minute). 6.13. Lubrication System a. OE engine oil filter is required; no substitutions permitted. b. OE oil pump PT# L310-14-100J is required and no modifications are permitted. c. Mazda Motorsports’ competition oil cooler adaptor kit with lines (part # 0000-01-5100KT) is required; no modification is permitted. d. Oil pressure sensor integrated into the required AIM data acquisition system is required. It must be operational and able to be viewed when pulling a competitor on track data. e. Oil and lubricants are unrestricted. 6.14. Engine Control Unit (ECU) a. Reference penalties for non-compliance of the Spec ECU flash in Section 21 below. Modifica- tion or attempted modification of the Spec ECU flash will result in a 12-month suspension from competition and $1,000.00 fine. b. Mazda Motorsports’ competition ECU (part # 0000-01-5379) is required; serial number must be visible; external or internal modification is not permitted. c. ECU calibrations and inputs must not be modified. d. OE engine electrical harness (part # NH18-67-020A) is required; no modification is permitted. e. OBDII diagnostics port must be operational in all cars. 1. The check engine light must be operational and perform the function test at start up. 2. The OBDII port must be available at all times (including during the race) for tech officials to install test equipment as necessary. 3. If a competitor uses the OBDII port to power any type of data acquisition system, he/she would be responsible for providing the splitter cable to plug in both units or unplug the data acquisition system. f. Instrument panel clusters must be operational and unmodified OE parts. g. Temporary data acquisition devices may be installed by the sanctioning body for technical compliance. h. Removal of Mazda ECU insulator PT# LFG1-13-3C1 is permitted (diagram below) 6.15. Miscellaneous a. The factory air conditioning system and all associated lines, compressor, condenser and evap- orator must be removed. 1. Once the AC compressor is removed, the OE AC pulley delete kit (Mazda part # LF17-15- 940E) is required. b. Serpentine belt Gates PT# 6PK-2170 or same size equivalent is required. 7. Exhaust a. OE exhaust manifold and OE heat shield must be replaced with Mazda Motorsports’ competi- tion part # 0000-06-5407-NC; no modification is permitted (e.g., internal or external wraps, coatings, paints, metal treatments, thermal barriers etc.). b. OE exhaust system must be replaced with Mazda Motorsports’ competition part # 0000-06- 5427-NC; no modification is permitted (e.g., internal or external wraps, coatings, paints, metal surface treatment, thermal barriers etc.). c. The forward oxygen (O2) sensor (OE Lambda Sensor) must remain in the factory location and in full working order. Mazda Motorsports’ competition O2 sensor installation kit wiring extender (part # 0000-10-5320) is permitted. d. The secondary post catalytic oxygen (O2) sensor must be removed. e. Heat shielding 1. OE heat shield protecting ABS unit from header may not be removed or modified. 2. OE muffler heat shield may not be removed or modified. 3. It is permitted to wrap the exhaust pipe from the mid connection flange to the muffler. (see red arrows in picture below) 4. Use of heat shielding material on transmission tunnel to replace OE heat shielding is permitted. OE heat shielding must be removed from transmission tunnel. (see diagram below) 8. Cooling System (cooling system checklist) a. Mazda Motorsports’ competition radiator and oil cooler assembly (part # 0000-01-5504-CR) is required (e.g., OE is not permitted). b. The radiator using the OE mounting brackets must be installed in its original location. c. The oil cooler may not be moved or altered from the pre-assembled mounting location. d. Radiator ducting may be placed on each side of the radiator tanks and the undertray to force air through the radiator fins. The gap between the top and sides of the radiator may be sealed but shall not perform any other function. e. The unmodified OE cooling fan must be maintained in full working order and mounted in the stock location. Axillary control of the radiator cooling fan may be added to activate the fan independent of the ECU, OE control of the fan must remain intact. f. Thermostats may be modified, removed or replaced. g. The OE water pump (Mazda part # 1F70-15-100) is required; no modification is permitted. h. The OE water pump pulley (Mazda part # L327-15-131) is required; no modification is permitted. i. Engine cooling system hoses and clamps may be substituted. j. The heater core may be removed along with HVAC evaporator core including all associated hard pipes and hoses. This is to include OE water to oil cooler lines as well as throttle body coolant lines. (Rear coolant pipe 0000-01-5514, bottom coolant pipe 0000- 01-5515) k. The OE engine coolant expansion tank may be replaced with any aftermarket part but and must not serve another purpose. 9. Clutch, Pressure Plate and Flywheel a. Vehicle may use any combination of the options listed in Table 11 below. Table 11: Clutch Component Part Numbers Description Mazda Part # Mazda Factory Clutch Disc LF05-16-460A ACT Sprung Clutch Disc 0000-02-5420-AC ACT Pressure Plate 0000-02-5405-AC ACT Clutch and PP Kit 0000-02-5004-G6 Mazda Factory Pressure Plate LF04-16-410A b. The unmodified pressure plate must be bolted directly to the stock, unmodified flywheel. c. OE flywheel (Mazda part # LF9G-11-500) is required. Factory Service Manual resurfacing specification is permitted; no other modification is permitted. d. Alternate clutch lines are permitted but must not serve another purpose. e. Clutch components must adhere to the minimum weights listed in Table 12 below: Table 12: Clutch Component Part Numbers Description Minimum Weight (lb.) Clutch disc 3.5 Pressure Plate 9.4 Flywheel 15.80 10. Transmission a. OE 2006-2015 6-speed gearbox and 4.10 final drive ratio are required. b. No modification of the internal parts and ratios are permitted except the installation of the unmodified parts contained in the Mazda Motorsports MX-5 transmission upgrade kit (part # 0000-02-5700). c. Mazda Motorsports Competition gear set 0000-02-6000 is allowed. Gear ratios are as follows: 1st - 3.82; 2nd - 2.26; 3rd - 1.64; 4th - 1.18; 5th - 1.00; 6th - 0.83/0.79. There are two (2) production 6th gears; either one is permitted. d. Alternate shift knobs are permitted. e. Nomex or aftermarket fireproof shift boots are permitted. Removal of the factory rubber shift boot is not permitted. f. No treating, coating, polishing or modification of any transmission or components are permitted. g. Fluids and/or lubricants may be substituted with any lubricant. h. Updating or backdating of transmissions from 2006–2015 is permitted; unmodified OE shifters must be retained. The use of short throw shifters is prohibited. i. An single inspection hole (not to exceed 1.5” in diameter) in the bottom of the bell housing is permitted for the sole purpose of technical inspection of the flywheel. It is permitted to plug or tape over theat hole. j. Transmission cooler(s) are permitted. 11. Differential a. Only the Following differentials are allowed. 1. Mazda Motorsports, unmodified, Torsen limited slip differential – 0000-02-5564 2. OE, unmodified, limited slip differential - Mazda part # MS03-27-200B 3. OE, unmodified, open differential are permitted. b. RX-8 differential mounting bracket (Mazda part # F151-39-730B) is permitted. c. Mazda Comp diff bushings 0000-04-5510 is permitted (MX-5 diff mount) d. Polishing, metal treatment or coating of differential or axle components are not permitted. e. Removal of metal/rubber isolator on the pinion flange is permitted. f. Differential cooler(s) are permitted. 12. Suspension and Steering: Suspension Modifications are limited to the addition of the Mazda Motorsports Spec MX-5 kit; details are as follows (including all modifications permitted): a. OE control arms are required; no modification is permitted. b. Mazda Motorsports’ TSB MX-5-002 must be followed re: the rear shock thread protector found in the “Spec MX-5: Four Pillars” page on MazdaMotorsports.com. The thread protector must measure 1.250”. (The TSB will not be applicable to the supply from Mazda Motorsports received after 7.15.2020 as they will have the updated thread protector.) c. Anti-roll bar links may be replaced with Mazda part # 0000-04-5597-KT 1. Cockpit adjustability is not permitted. d. Mazda Motorsports’ competition sway bars are required, mounting guidelines: 1. Metal shims up to 1/8” total thickness are permitted between each anti-roll bar mount shackle and the stock mounting point on the chassis. 2. One end of the sway bar(s) may be disconnected as a suspension tuning aid. 3. The bar must remain in place and be solidly attached to the suspension on one end. 4. Sway bar end links must be installed on the unmodified stock attachment points. e. Camber, caster, and toe are unrestricted within the limits of the unmodified factory adjust- ments in conjunction with Mazda Motorsports front offset bushing (part # 000-04-5407-NC). f. Minimum ride height is unrestricted. g. Nuts & bolts may be replaced by similar items performing the same fastening function(s). h. Relocation or reinforcement of any suspension parts or mounting points is not permitted, with the following exceptions: 1. Addition of spacers or washers on a horizontal plane is permitted at the rear lower shock mount to the spindle per the shock installation instructions. 2. Updating to RX-8 rear toe link and rear trailing arm is permitted. See Table 13 below. Table 13: Permitted RX-8 Trailing Arm and Toe Link Part #s Description Mazda Part # RX-8 Trailing Arm F189-28-200A RX-8 Toe Link F189-28-45XA i. OE power steering pump with pulley (Mazda part # NE51-32-650D) is required; Mazda Motor- sports Power steering flow restrictor PT#- 0000-04-5532 is permitted; no other modification is permitted. j. OE power steering rack (Mazda part #: NE51-32-110C) is required; no modification or reloca- tion is permitted. k. Factory power steering reservoir may be replaced. l. Wheel center caps must be removed. m. All chassis, structural and electrical repairs must follow factory procedures, specifications, and dimensions as described in the applicable service manual. Reinforcement (e.g., seam welding, material addition, etc.) is not permitted. n. Steering lock mechanisms must be removed. o. The distance from the outside of the wheel rim to outside of the opposing wheel rim for both the front and rear of the vehicle must not exceed 69.5”. I. The distance Measurement is obtained by measuring the distance between the wheel lips by going through the wheel spokes at the bottom of the wheel at its widest point via tape measure. (Measure the outside wheel lip of one wheel to outside wheel lip of the other wheel on same axle.) p. Mazda Motorsports’ competition rear toe link (part # 0000-04-5426) is permitted; no modification is permitted. q. Mazda Motorsport’s Spec MX-5 Suspension Kit includes the items set forth in Items in Table 14. seen below are components within this kit. No substitutions or modifications of parts are permitted. The unmodified kits must be used in their entirety, except as specified. Table 14: Spec MX-5 Suspension Kit (All parts are required; no modification is permitted.) Description Location Mazda Part # Shocks Front 0000-04-5291-SA Rear 0000-04-5292-SA Springs Front 0000-04-9700-08 Rear 0000-04-9400-07 Helper Springs Front/Rear 0000-04-9926 Front Penske Mount Kit Front 0000-04-5359 Rear Penske Mount Kit Rear 0000-04-5358 Sway Bar Kit Front and Rear 0000-04-5306-EB Offset Bushings Front 0000-04-5407-NC 13. Hubs a. OE RX-8 front hub (Mazda part # F189-33-04X) may be substituted in place of the OE Miata 2006-2015 front hub. b. Mazda Motorsports’ competition RX-8 rear hub upgrade kit (part # 0000-04-5811-KT) may be substituted in place of the OE MX- 5 rear hubs; this unmodified kit must be used in its entirety. c. OE RX-8 rear uprights, bearings, hubs, and hybrid axel may be used in place of OE MX-5 parts. 14. Brakes a. OE brake rotors must be used and adhere to the specifications below in Table 15. Table 15: Brake Rotor Dimensions Location Diameter Notes Front 290mm (11.4”) Vented Rear 280mm (11.0”) Solid Front backing plates/dirt shields may be removed. (see see red arrow in diagram below) b. Rear backing plates/dirt shields may be removed. (see red arrow in diagram below) c. Brake lines may be replaced with competition braided steel lines; option: Mazda Motorsports’ part # 0000-03-5212. d. The Factory ABS system must remain intact, unmodified, and in full working order. e. Brake slider pin may be used in either/both front location B25D-33-694. (This prevents a stuck sliding caliper due to the rubber grommet) f. Parking brake mechanisms and actuating components may be removed. g. Brake fluid is unrestricted. h. Mazda Motorsports’ competition brake duct kit (part # 0000-03-5301) is permitted. i. The forward vertical inner fender panels may be modified to fit the brake kit hose to the fog light openings but may not be modified to serve any additional purpose. j. Mazda Motorsports’ competition brake pads are required; see eligible brake pad compounds in Table 16. No other brake pads are permitted. Table 16: Brake Pad part numbers Pad Style Mazda Part # Notes Front Pad 0000-03-5104-SP RST-3 compound Rear Pad 0000-03-5116-29 RSL-29 compound 15. Wheels The following unmodified wheel options below in Table 17 are permitted for use. Table 17: WHEELS Description Color Mazda Part # 17x7” OE Wheel Gun Metallic 99656-47070 17x7” OE Wheel Silver 99656-77070 Mazda Motorsports’ Competition MX-5 Wheel Gun Metallic 0000-04-5706-GM Mazda Motorsports’ Competition MX-5 Wheel Silver 0000-04-5706-SL a. Wheels may be painted. b. Aftermarket (any) wheel studs and lug nuts are permitted., provided that a minimum of two he threads must protrude beyond the lug nut with the wheel installed with a minimum of two (2) full threads showing; Wheel studs may not be gun drilled. c. Wheel spacers are not permitted. 16. Tires a. Dry tires: Toyo RR P235/40/ZR17 b. Wet tires: Toyo RA1 P235/40/ZR17. 17. Electrical Equipment a. OE ignition coils (Mazda part # L3G2-18-100B) are required; no modification is permitted. b. Mazda’s competition spark plugs (part # 0000-10-R7IX-11) are required; no modification is permitted. c. The crankshaft position sensor and crankshaft pulley relationship must be as specified in the 2006- 2015 MX-5 Factory Service Manual. d. One of the two OE alternators (Mazda part # LF9H-18-300R-OA, L3P9-18-300D) is required; no modification is permitted. e. The alternator must not be externally regulated or disabled in any way other than by the OE production ECU/wiring circuit and master kill switch. f. The electronic control module (ECM) control circuit for alternator charging must be OE - unmodified and operational. g. One of the two OE alternator drive pulley part # AJ51-18-W10 (60mm), Part# L813-18- W11(55mm) is required; no modification is permitted. h. All sensors related to engine operating parameters must be used and must be stock, unmodi- fied Mazda parts for the correct year of the vehicle on which they are installed. i. Any and all sensors and their respective locations, mounts, and wiring harness leads may not be altered except as elsewhere in this rule set. e Spec-MX-5 rules. j. Any sensors required for non-OE gauges must be in addition to the Mazda sensors. k. All alternate gauge and sensors must have independent wiring. Splicing, tapping, or altering of the factory engine wiring harnesses is prohibited with the exception of adding an aftermarket tachom- eter/shift light as follows: 1. It is permitted to splice into the yellow wire with the black stripe (pin 2BA - Ignition Coil 1 control circuit) in the engine harness to obtain the tachometer signal for an aftermarket tachometer or shift light. 2. Splicing must be done within 5” of the ECU. l. Data acquisition’s sensor(s) may be added, provided they do not require splicing or alteration to the factory engine wiring harness. m. Batteries 1. Batteries may be replaced with those of an alternate manufacturer, provided they are of similar amp-hour capacity, and size, including lead acid or AGM.; lLithium batteries are not permitted. 2. Batteries must weigh no less than 18.0lb and no more than 35.0lb 3. Additional battery hold-down devices are recommended. 4. Battery MUST be moved from the original location to the passenger side in the upper trunk area in front of the tail lamp. This will require the use of a bulkhead that separates the driver / passenger compartment completely from the trunk and the battery location. See section 5.I for reference. 18. Roll Cage a. Roll cage must adhere to SCCA’s current GCR Section 9.4 for Touring 4 cars; with the following exceptions: 1. One tube not to exceed 1.75” in diameter may be added which extends from the door bars to the rocker panel on each side. The landing plate for this tube can be no longer than 5” in length. The landing plates must be centered between the front and rear landing plates for the lower NASCAR or X brace bar. 2. Main hoop mounting plates may be on multiple planes; however, they must not be greater than 19” on any side. b. Playboy MX-5 Cup car cages manufactured by Racing Cages, Inc. with the official serial number plate on the main hoop are allowed to retain the lower door bar and two 3” attachment points to the rocker panel on both the driver’s side and passenger side. No additional seam welding or lengthening of the original attachment points is allowed. 19. Safety a. An electrical master (“kill”) switch is required. See current GCR Section 9.3 Master Switch. b. Vehicle must be equipped with a driver’s restraint system meeting the specifications of current GCR Section 9.3 Drivers Restraint System. c. Installation of a fire extinguisher or fire system is required. See current GCR 9.3 Fire System. d. Vehicle must have a driver’s side window safety net complying with current GCR Section 9.3 Window Safety Nets. Nets must be mounted to provide protection in the event the driver’s door opens. 20. Data Acquisition 1 A technical evaluation process for cars is available from the Series. Part of this process is the required download of AiM Data files after each timed session (Qualifying 1 & 2, Races 1 & 2). Within 30 minutes of each timed session end, all Series Competitors MUST send the AiM Data file (.XRK) for all timed laps of that session to the secure email address (data@specmx-5.com), where data will be reviewed by AiM directly. Failure to adhere to this guideline from the Series, or having non- functioning data, may be grounds for penalty or disqualification by the Series. a. Vehicle must be equipped with current generation AiM data acquisition system (configurable in Race Studio 3) that can provide on track data to AiM race studio 3. The data acquisition system may only read the OBDII/ECU data stream. It is not permitted to alter/manipulate data to and from the ECU. The AiM system may be utilized to trigger a switch I.E., cooling fans or diff cooler pumps but must be wired via a separate analog circuit. Refer to Section 17: Electrical Equipment above for installation requirements. b. The connection at the OBDII port for the AiM system may be made in either one of two ways: 1. Through a dedicated OBDII AiM adaptor. 2. By direct wiring to the back of the OBDII port within 3” of the ODBII connector. c. Fuel pressure datalogging is required. d. Oil pressure datalogging is required. e. All cars must run the latest AIM Data Logger Spec MX-5 ECU Protocol 21. Mandatory Video Camera Cars running in Spec MX-5 must have a functioning video recorder/camera during all qualifying and race sessions as described in 9.3.11. Upon request by an SCCA official, competitors must provide their video recording/data, which may be used by the SCCA for any purpose including but not limited to rule enforcement and marketing. Failure to comply with a video request from an official, or having a non-functioning video recorder/camera may will be grounds for penalty or disqualification. 22. Parts Confiscation a. Tech officials may confiscate competitors’ parts for the purpose of verification of tech compliance. 23. Penalties Clarification – Non-Compliant Parts Level Infraction Penalty 1 Non-compliant modification to any of the spec parts, engine components, ECU/Elec- tronics or modification to the chassis. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 12 months following the suspension. A level 1 infraction carries a $1,000 fine. 2 Non-compliant modification to the suspen- sion or drivetrain outside of level one infrac- tions: engine, fuel system, charging system, exhaust, and intake system. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 6 months following the suspension. A level 2 infraction carries a $500 fine. 3 Use of an unauthorized or non-compliant part, engine component, ECU/Electronics or chassis or chassis part. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 12 months following the suspension. A level 3 infraction carries a $1,000 fine 4 Non-compliance (non-modification such as incorrect part)Use of an unauthorized or non- compliant for any of the suspension or drive- train part or component outside of level one infractions: engine, fuel system, charging system, exhaust, and intake system. May suspend the driver (i.e. suspend) of the non- compliant Spec MX-5 from competing in SCCA events for the 6 months following the suspension. A level 4 infraction carries a $500 fine
wordingSRF Hoosier decal requirement reduced from four decals in specific locations to three decals with simpler placement rules.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.f.3, change as follows: "Four (4) "Hoosier" decals are required in the following locations: Two (2) 11" X 3" decals on the vertical plane of the front nose to the outside of the cooling opening on each side and two (2) 18" X 5" decals, one on each side of the engine cover or above the rear wheel openings on the vertical plane. Hoosier decals are available, free of charge, from all Hoosier tire distributors including SCCA Enterprises Per Hoosier's contingency program, three (3) decals are required to qualify for contingency awards. One (1) decal must be located on each side of the car and one (1) decal must be visible on the front."
slowerSRF brake rotor minimum thickness increases from 12.20mm to 13.25mm, Wilwood vented rotor P/N 800065.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.X.g, change as follows: "Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 shall must be used as delivered with no machining of any kind. Minimum thickness 12.20mm (0.481”) 13.25mm (0.522”)."
wordingSRF3 Hoosier logo placement changes from four decals to three decals in different locations.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.2.B, change as follows: "Mandatory identification: "SRF3" near the side car numbers. "Hoosier" logo (4) on both sides front lower outer corners of the nose and each side of the tail. Three (3) "Hoosier" logos, one (1) on each side of the car and one (1) on the center front of the car."
wordingSMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted.
As printed in Fastrack
In GCR, Section 9.1.7.D.5.u-w, change as follows: "u. Alternate guages and instuments may be added. The original OE instrument cluster must remain unmodified, connected and functional. However, it may be relocated to allow the mounting of an aftermarket dash such as an AIM. The wiring to relocated the dash may not be cut or extended, it may only be re-routed. The remainder of teh dashboard or panel must remain intact. v. Alternate gauges and instuments may be added. w. Modifications may be made to the foot pedals to improve the comfort and accessibility to the driver; relocation of mounting points is not permitted. 1. Dead pedal/footrest and heel stop may be added.
wordingSMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted.
As printed in Fastrack
In GCR, Section 9.1.7.D.5.u-w, change as follows: "u. Alternate guages and instuments may be added. The original OE instrument cluster must remain unmodified, connected and functional. However, it may be relocated to allow the mounting of an aftermarket dash such as an AIM. The wiring to relocated the dash may not be cut or extended, it may only be re-routed. The remainder of teh dashboard or panel must remain intact. v. Alternate gauges and instuments may be added. w. Modifications may be made to the foot pedals to improve the comfort and accessibility to the driver; relocation of mounting points is not permitted. 1. Dead pedal/footrest and heel stop may be added.
In GCR, Section APPENDIX L. 2013 TA2 TECHNICAL REGULATIONS, B.2.c., change as follows: "B. Aerodynamic Devices 2. Rear wing c. The entire rear wing assembly, including the end plates and any Gurney flap, shall be mounted level with, or below, the peak of the roof. OEM aerodynamic devices do not need to adhere to the height rule."
A specification table follows in the original; it is not shown here.
Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta → Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta 2025-03-07 to 2026-03-06
wordingSRF drivers with disabilities may modify seat and controls for safety and comfort with approval and logbook notation.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.D, add the following: "f. Driver Safety and Comfort modifications to seat and controls for drivers with disabilities may be made only by approval. These modifications must be reported to SCCA Enterprises and noted in the car logbook. The modifications are approved only for the noted driver with disabilities. If the car is used by or sold to another driver, it must be returned to the previous standard configuration."
wordingSMX Toyo RR P235/40/ZR17 tire rules clarified: one set per weekend, marking after first session, damage replacement procedures revised.
As printed in Fastrack
In GCR, Section 9.1.7.1.D.16.c., change as follows: "1. Cars in SMX are limited to running 1 (one) new (sticker) set, used tires or any of those combinations, of class specified Toyo tires (Toyo RR P235/40/ZR17) per regular season Hoosier Super Tour event weekend during qualifying and races (not including any test day sessions). Before the first dry qualifying or race (if rain in qualifying) session competitors will supply four Toyo RR P235/40/ZR17 tires for marking to use during the entire weekend. Class specified rain tires will not be marked. SMX cars are limited to one set of Toyo RR P235/40/ZR17 per Hoosier Super Tour event weekend for all dry qualifying and race sessions. This limitation does not include testing or practice sessions. Approved rain tires will not be required to be marked. 2. A mandatory impound for all SMX competitors is required after the first dry qualifying or race (if rain in qualifying) session. It
Show 11 more lines
is the competitor’s responsibility to ensure their tires are marked prior to going on track for the next session. A mandatory impound for all SMX competitors will occur after the first dry qualifying or race session. All tires will be marked for the remainder of the race weekend. It is the competitor’s responsibility to report to impound and ensure their tires are marked prior to leaving impound. 3. If a competitor damages a tire or wheel, and there is a safety concern, the competitor must find the Hoosier Super Tour Series Tech Chief or SMX CCC, if assigned, for inspection. At the direction of the Hoosier Super Tour Series Tech Chief or SMX CCC, the compet- itor will be allowed to substitute alternate used tire(s) to replace the damaged tire(s). New tires are not an option as a replacement tire for a damaged tire. If a competitor damages a tire or wheel and there is a safety concern, the competitor must find the Hooseir Super Tour Series Tech Chief or SMX CCC, if assigned, for inspection. At the discretion of the Hoosier Super Tour Series Tech Chief of SMX CCC the competitor may be allowed to substitute alternate used tires(s) to replace the damaged tire(s). New tires are not an option as a replacement tire for a damaged tire."
wordingSM cars limited to one set of Hoosier SM 7.5 P205/50/ZR17 per Super Tour event weekend for dry sessions.
As printed in Fastrack
In GCR Section 9.1.7.C.1.6.c., change as follows: "1. A mandatory impound for all SMX competitors will occur after the first dry qualifying or race session. All tires will be marked for the remainder of the race weekend. It is the competitor’s responsibility to report to impound and ensure their tires are marked prior to leaving impound. SM cars are limited to one set of Hoosier SM 7.5 P205/50/ZR17 per Hoosier Super Tour event weekend for all dry qualifying and race sessions. This limitation does not include testing or practice sessions. Approved rain tires will not be required to be marked. 2. A mandatory impound for all SM competitors is required after the first dry qualifying or race (if rain in qualifying) session. It is the competitor’sresponsibility to ensure their tires are marked prior to going on track for the next session. A mandatory impound
Show 10 more lines
for all SM competitors will occur after the first dry qualifying or race session. All tires will be marked for the remainder of the race weekend. It is the competitor’s responsibility to report to impound and ensure their tires are marked prior to leaving impound. 3. If a competitor damages a tire or wheel, and there is a safety concern, the competitor must find the Hoosier Super Tour Series Tech Chief or SM CCC, if assigned, for inspection. At the direction of the Hoosier Super Tour Series Tech Chief or SM CCC, the competitor will be allowed to substitute alternate used tire(s) to replace the damaged tire(s). New tires are not an option as a replacement tire for a damaged tire If a competitor damages a tire or wheel and there is a safety concern, the competitor must find the Hooseir Super Tour Series Tech Chief or SMX CCC, if assigned, for inspection. At the discretion of the Hoosier Super Tour Series Tech Chief of SMX CCC the competitor may be allowed to substitute alternate used tires(s) to replace the damaged tire(s). New tires are not an option as a replacement tire for a damaged tire."
wordingSMX data submission deadline extended from 30 to 60 minutes after each timed session.
As printed in Fastrack
RM 25-04 Please update the data acquisition timeframe in GCR section 9.1.7.1.D.20 "20. Data Acquisition 1. A technical evaluation process for cars is available. Part of this process is the required download of AiM Data files after each timed session (Qualifying 1 & 2, Races 1 & 2). Within 30 60 minutes of each timed session end, all competitors MUST send the AiM Data file (.XRK) for all timed laps of that session to the secure email address (data@specmx-5.com), where data will be reviewed by AiM directly. Failure to adhere to this guideline, or having non-functioning data, may be grounds for penalty or disqualification."
wordingSMX drivers must submit data acquisition files on time or face suspension and $250 fine.
As printed in Fastrack
In GCR, Section 9.1.7.1.23 add new level 5 infraction as follows: Level: "5" Infraction: "Failure to successfully submit (received by data@specmx-5.com) data acquisition file to data@specmx-5 per the timeframes outlined in GCR section 9.1.7.1.20." Penalty: "May suspend the driver (i.e. suspend) of the Spec MX-5 that failed to submit data on time or at all from competing in SCCA events for the 3 months following the suspension. A level 5 infraction may carry a $250.00 fine."
wordingSMX drivers must submit data acquisition files on time or face suspension and $250 fine.
As printed in Fastrack
In GCR, Section 9.1.7.1.23 add new level 5 infraction as follows: Level: "5" Infraction: "Failure to successfully submit (received by data@specmx-5.com) data acquisition file to data@specmx-5 per the timeframes outlined in GCR section 9.1.7.1.20." Penalty: "May suspend the driver (i.e. suspend) of the Spec MX-5 that failed to submit data on time or at all from competing in SCCA events for the 3 months following the suspension. A level 5 infraction may carry a $250.00 fine."
SMX Committee) SMX Penaly Clarification updated language
wordingSMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine.
As printed in Fastrack
In GCR, Section 9.1.7.1.23. change as follows: Rename as follows: "Penalties Clarification – Non-Compliant Parts SMX Penalty Guidelines" Change the Penalty language for level 1 to the following: "A level 1 infraction carries may carry a $1,000 fine." Change the penalty language for level 2 to the following: "A level 2 infraction carries may carry a $500 fine." Change the penalty language for level 3 to the following: "A level 3 infraction carries may carry a $1,000 fine." Change the penalty language for level 4 to the following: "A level 4 infraction carries may carry a $500 fine."
SM Committee) SMX Penaly Clarification updated language
wordingSMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine.
As printed in Fastrack
In GCR, Section 9.1.7.1.23. change as follows: Rename as follows: "Penalties Clarification – Non-Compliant Parts SMX Penalty Guidelines" Change the Penalty language for level 1 to the following: "A level 1 infraction carries may carry a $1,000 fine." Change the penalty language for level 2 to the following: "A level 2 infraction carries may carry a $500 fine." Change the penalty language for level 3 to the following: "A level 3 infraction carries may carry a $1,000 fine." Change the penalty language for level 4 to the following: "A level 4 infraction carries may carry a $500 fine."
Effective 9/1/25 in SRF, GCR section 9.1.8.D.1.V.ff, add the following: "SRF3 Oil Cooler, P/N G480503 may be used as mounted per the GEN3 Assembly Manual. No fan permitted for SRF. HD Oil Cooler kit P/N G1148500 may be used as mounted per the GEN3 Conversion Manual." Effective 9/1/25 in SRF, GCR section 9.1.8.D.X.g, change as follows: "Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 must be used as delivered with no machining of any kind. Minimum thickness 13.25mm (0.522”). The Renault Alliance solid front rotors may not be used. Rubber caliper bushings may be replaced with bronze bushings P/N 1196185 or P/N 1196185. Original caliper pistons may be replaced with vented caliper piston P/N 1196184; no other modification allowed. Wilwood caliper with bracket universal fit P/N 800038
Show 11 more lines
may be used as delivered with no modification of any kind. Wilwood knock back spring (2.63 lbs.) P/N 800045 may be used as delivered with no modification of any kind; maximum of one spring per caliper. 1. Hawk Blue pads P/N 801993 only 2. Wilwood Vented Rotor P/N 800065 only, as delivered, with no machining of any kind. Minimum thickness 13.25mm (0.522") 3. Wilwood universal caliper Kit P/N 1180008 as delivered, caliper only P/N 800038; Wilwood knock back spring P/N 800045 may be used as delivered, with no machining of any kind, and only one spring per caliper 4. Renault caliper rubber bushings may be replaced with bronze bushings P/N 1196185 or P/N 1196185A 5. Renault caliper piston may be replaced with P/N 1196184 vented piston as delivered, with no machining of any kind 6. Girling .750" Master Cylinder P/N 880358 as delivered, with no machining of any kind 7. Wilwood .750" Master Cylinder P/N 880357 as delivered, with no machining of any kind 8. Tilton .750" Master Cylinder P/N 880360 as delivered, with no machining of any kind"
otherSRF3 adds HD Oil Cooler P/N G1148500 as alternative to standard cooler P/N G480503.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.1.V.ff, change as follows: "SRF3 Oil Cooler, P/N G480503 or HD Oil Cooler P/N G1148500 may be used as mounted per the GEN3 Assembly Manual. No fan permitted for SRF. HD Oil Cooler kit P/N G1148500 may be used as mounted per the GEN3 Conversion Manual."
cars addedGT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height.
As printed in Fastrack
In GCR, change as follows: 9.1.2 Page 68: "GT-3U (GT3U)" 9.1.2.F page 320: "9.1.2.F. GT-2, 3, 3U LI TE CATEGORY SPECIFICATIONS" 9.1.3.9 Page 320: "9. All GT3U (Majors and Runoffs) cars using up to 15”x7” wheels limited to 225 section width tires shall run at current GT3 race weight plus 225lbs. All Gt3U cars shall run a DOT approved tire with a maximum section width of 245. GT3U cars are allowed optional 15”x9” wheels with a 1.5% weight addition or up to 18”x9” wheels with a 3.0% weight addition to the total weight including the 225 lbs. TCR cars are ineligible for GT3/GT3U. Table B: Alternate Vehicle and Engine Allowances Page 461:
Show 3 more lines
“Increase the minimum weight of all GT3/GT3U 2.0 liter unrestricted engines to +75 lbs. All GT3 cars running in STU must meet the minimum ride height of 3.0” for the main frame rails not including rub blocks and a 2” minimum for the front spoiler and splitter."
wordingSRF3 spark plugs restricted to NGK LTR7IX-11 P/N G301041 only, washers and sealing rings prohibited.
As printed in Fastrack
In SRF, GCR section 9.1.8.D.2.H.18, add the following: "Spark Plugs: P/N G301041 ONLY NGK LTR7IX-11 / Washers or sealing rings are not allowed for any purpose."
What the rules allowed changed as listed; this does not say what any particular car ran.