This track has been raced on 4 configurations (The Circuit, 2.57 mi; 2.92 mi; 1.83 mi; 3.02 mi). Laps on different configurations are not comparable, so only events on the 2.57 mile layout are shown; switch above to see the others.
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): Tom Burt in Cal Club 2025 PM (1:42.300; the car's best in any other session was 1:52.334 and the rest of the class's best all week 1:50.233).
5 laps are left out as timing errors (far too short to be a lap of this track). The rest of those sessions, sectors included, is used.
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 0.65 mi
S2 IM1 → IM2 0.75 mi
S3 IM2 → SF 1.17 mi
Spd In → Out 0.03 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
Stohr WF1
P2
2
1:09.928Tim Day Jr
1:09.928Tim Day Jr
1:39.758Tim Day Jr
155.4Tim Day Jr
26.848Tim Day Jr
28.010Tim Day Jr
42.420Tim Day Jr
Stohr WF1
P2
1
1:09.928Tim Day Jr
1:09.928Tim Day Jr
1:39.758Tim Day Jr
155.4Tim Day Jr
26.848Tim Day Jr
28.010Tim Day Jr
42.420Tim Day Jr
Stohr WF1 (2004)
P2
1
1:12.573Kevin Mitz
1:12.573Kevin Mitz
SCCA Ent SRF3
SRF3
38
1:50.233Caleb Shrader
1:50.233Caleb Shrader
1:50.825Caleb Shrader
138.9Paul Marino
30.136Caleb Shrader
31.672Caleb Shrader
44.841Tom Burt
Mazda Miata
STL/T4
20
1:51.665Jared Korth
1:54.963Nick Leverone
1:54.845Gavin Wardle
136.6Bryce Johnson
8.264Gavin Wardle
32.218Jared Korth
48.811Jared Korth
Mazda MX-5
STL/T4
7
1:51.665Jared Korth
1:57.404Ryan Gutile
1:54.845Gavin Wardle
136.6Bryce Johnson
8.264Gavin Wardle
32.218Jared Korth
48.811Jared Korth
Mazda Miata
STL/T4
12
1:52.983Wesley Mollno
1:54.963Nick Leverone
1:55.682Nick Leverone
133.4Wesley Mollno
30.815Jon Davies
32.820Jon Davies
49.197Wesley Mollno
Mazda MX-5 (2015)
STL
1
2:00.239Adrian Comstock
2:00.239Adrian Comstock
2:00.722Adrian Comstock
133.0Adrian Comstock
32.847Adrian Comstock
34.493Adrian Comstock
52.675Adrian Comstock
Mazda RX-8
STL/T4
2
1:53.515David LeCren
2:06.604Steven Kiratsous
2:05.858Steven Kiratsous
121.0David LeCren
31.217David LeCren
32.486David LeCren
49.550David LeCren
Honda Civic Si
STL
1
1:56.438Jonathan Lugod
1:57.331Jonathan Lugod
1:56.438Jonathan Lugod
106.8Jonathan Lugod
31.787Jonathan Lugod
33.468Jonathan Lugod
50.873Jonathan Lugod
Honda Prelude
STL
1
1:56.961Carl Young
1:57.917Carl Young
1:56.961Carl Young
104.5Carl Young
31.994Carl Young
33.745Carl Young
50.892Carl Young
Toyota FRS
T4
1
2:01.157Izzy Sanchez
2:01.678Izzy Sanchez
2:01.157Izzy Sanchez
135.5Izzy Sanchez
32.955Izzy Sanchez
34.751Izzy Sanchez
52.742Izzy Sanchez
Scion FR-S
T4
1
2:01.843Tony Kiratsous
2:01.843Tony Kiratsous
2:03.865Tony Kiratsous
133.6Tony Kiratsous
32.895Tony Kiratsous
34.958Tony Kiratsous
53.933Tony Kiratsous
Porsche Boxster
T4
1
2:05.833Lynne Griffiths
2:05.833Lynne Griffiths
2:07.226Lynne Griffiths
122.0Lynne Griffiths
33.699Lynne Griffiths
36.036Lynne Griffiths
55.879Lynne Griffiths
Acura integra
STL
1
2:24.310Jack McEachern
2:24.310Jack McEachern
2:24.550Jack McEachern
77.6Jack McEachern
38.960Jack McEachern
41.141Jack McEachern
1:02.410Jack McEachern
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
Cal Club 2023 → Cal Club 2024 2023-02-24 to 2024-02-23
SRF3 Update SRF Brake Rule
#33469 from Robey Clark · Rule change · TB 23-01 (2023-01 Fastrack)
slowerSRF Renault Alliance solid front rotors banned; restrictor reduced 35mm to 34mm for 2011+ Kawasaki; minimum weight increased to 1100 lbs for 2009+ stock engines.
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 shall be used as delivered with no machining of any kind. Minimum thickness 12.20mm (0.481"). The 1985 Renault Alliance solid front rotor (Reference: Bendix PRT1318 or Centrix 121.11004) may be used on front, rear, or both axles, but each axle must be paired to the same type rotor. 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 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;
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maximum of one spring per caliper." P2 Engine Table Spec Line Engine Series
A specification table follows in the original; it is not shown here.
T4 BMW 320I intercooler
#33762 from Chi Ho · Rule change · TB 23-03 (2023-03 Fastrack)
fasterT3 BMW 320I now permitted to use aftermarket intercooler.
In T3 Spec Lines, BMW- 320I, add to Notes the following: "Aftermarket intercooler permitted."
SRF3 Update SRF Bodywork Fitment Rule
#33765 from Robey Clark · Rule change · TB 23-03 (2023-03 Fastrack)
neutralSRF3 tail sections allowed on SRFs with GEN3 airbox shimming up to 19 mm; alternate dash panel P/N 180100 or 180101 relocated in rules.
In Spec Racer Ford, GCR section 9.1.8.D.1.E, change as follows: "j. Optional Bodywork Modification: Viewing the tail section of the car from behind, draw a vertical line at the left and right ends of the outer vents from the bottom edge of the bodywork up to a point two (2) inches below the crease at the lower edge of the vented panel. Make a vertical cut at each line. The horizontal cut is to be one (1) inch below the crease at the base of the vented panel. Leave a one (1) inch radius at each corner. Air Scoop (P/N 190000) must be installed in conjunction with rear cutout per Enterprises installation instructions. SRF3 tail sections are allowed on SRFs. For purposes of tail section to center section fitment with the GEN3 airbox, shimming is allowed at the rear of the center section. Shim material may be up to 19 mm (0.75") thick along the 1" upper square sidepod
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tube. Mounting location cannot be modified or added. Shim material must be securely attached, but must not be welded. An alternate dash panel has been approved for use in Spec Racer Fords. The dash will be furnished by Enterprises only. P/N 180100 or 180101 k. Required Bodywork Modification: A 22.5" diameter wheel arch shall be cut in each side of the tail section. Viewing the tail section from the side, draw a vertical line at the drive axle centerline. Locate the top of the wheel arch at a point measured from the bottom edge of the tail section 9.25" vertically along the centerline. The 22.5" diameter circle intersects the bottom edge of the tail section 11.1" either side of the centerline. The tail section may be reinforced in the forward and aft portions of the wheel arch. Dimension tolerance is +/- 0.75". l. An alternate dash panel has been approved for use in Spec Racer Fords. The dash will be furnished by Enterprises only. P/N 180100 or 180101."
T4 Request to Classify 2004-2008 Acura TSX in T4
#33590 from William Phee · Rule change · TB 23-04 (2023-04 Fastrack)
neutralAcura TSX 2004-2008 newly classified in T4 at 3000 lbs minimum weight with 2354cc engine.
In T4 Spec lines, classify Acura TSX (2004-2008) as follows:
A specification table follows in the original; it is not shown here.
P2 Remove redundant effective date language and update engine table
#34012 from Club Racing Board · Rule change · TB 23-04 (2023-04 Fastrack)
neutralP2 engine table wording updated; redundant effective date language removed.
In P2 Engine Table, Spec Line B.1, change as follows:
T4 T4 Mustang Brakes/Swaybar
#34036 from Scotty B White · Rule change · TB 23-04 (2023-04 Fastrack)
fasterT4 Mustang rear sway bar increases from 22mm to 28mm permitted.
In T4 Spec Lines, Ford Mustang (2005-2010), change Notes as follows: "Any sway bar up to F: 35mm and R: 22mm 28mm permitted."
P2 E&O - Correct dimensional equivalents
#34038 from Club Racing Board · Rule change · TB 23-04 (2023-04 Fastrack)
slowerP2 motorcycle engines: 2011+ Kawasaki restrictor reduced to 34mm, minimum weight raised to 1100 lbs; 2009+ other brands weight raised to 1100 lbs.
In P2, GCR section 9.1.8.C.D.2, change as follows: "Height: No part of the vehicle having special or significant aerodynamic function shall exceed a height of 115cm (45.275 inches) above the ground with the car in normal racing trim, driver aboard." In P2, GCR section 9.1.8.C.D.3, change as follows: "However, no portion shall extend more than 10cm (3.937 inches) beyond a plane tangent to the outer face of the front and rear wheels with tires." P2 Engine Table Spec
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Line Engine Series
A specification table follows in the original; it is not shown here.
SRF3 Update SRF Front W2 Rain Tire Part Number
#34118 from Robey Clark · Rule change · TB 23-05 (2023-05 Fastrack)
neutralSRF Hoosier front rain tyre part number changes from 46100 to 46101 P185/65R13 W2.
In SRF, GCR section 9.1.8.D.1.X.f, change as follows: "Front – Hoosier P/N 46100 1 P185/65R13 W2"
P2 Clarify minimum side body height requirement
#34143 from Club Racing Board · Rule change · TB 23-05 (2023-05 Fastrack)
neutralP2 side body height requirement clarified: outermost surface between wheel openings must equal front axle centerline height.
In P2, GCR section 9.1.8.C.D.6, change as follows: "As viewed from the side, T the outermost surface of side pods body between the front and rear wheel openings and above the floor must have a minimum height equal to the height of the front axle centerline."
P2 Clarify closed cockpit single seat car allowance
#34144 from Club Racing Board · Rule change · TB 23-05 (2023-05 Fastrack)
neutralP2 closed cockpit single seat cars now prohibited unless specifically allowed in Table 1.
In P2, GCR section 9.1.8.C.C, add a section as follows: "4. Closed cockpit single seat cars are not permitted unless specifically allowed by a spec line in Table 1."
fasterT4 Mini Cooper S all years now run 17-inch wheels, up from 16, with wider rims to 8 inches.
In T4 Spec Lines, Mini Cooper S (02-04), change as follows: Wheel Size: "16 x 7 17 x 8" Add to Notes: "Wheels conforming to B-spec rules are permitted." In T4 Spec Lines, Mini Cooper S (05-06), change as follows: Wheel Size: "16 x 7 17 x 8" Add to Notes: "Wheels conforming to B-spec rules are permitted." In T4 Spec Lines, Mini Cooper S (07-13), change as follows: Wheel Size: "17 x 7 8"
neutralSTL ITA/ITS RX7 and 1985+ ITA/ITS/ITB/ITC vehicles clarified to conform to section 9.1.4.2 tire specifications.
In STL Spec Lines, Table B: Alternate Vehicle and Engine Allowances, change Notes as follows: ITA-spec and ITS-spec RX7: "Must completely conform to ITCS specifications. Tires must conform to 9.1.4, Tires & Wheels. Tires must also conform to 9.1.4.2.Tires." ITS, ITA, ITB, or ITC vehicles (1985- ): "Must completely conform to ITCS specifications. Tires must conform to 9.1.4, Tires & Wheels. Tires must also conform to 9.1.4.2.Tires."
SRF3 Hoosier SRF Wet Front Tire Rule Update
#34189 from Robey Clark · Rule change · TB 23-06 (2023-06 Fastrack)
unclearSRF Hoosier wet front tire updated to P/N 46100 P185/60R13 H20 or W2.
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."
T4 96-01 Audi a4 2.8 Spring Rate
#34217 from Michael Gordhamer · Rule change · TB 23-06 (2023-05 Fastrack)
fasterT4 Audi A4 2.8 V6 wheels grow to 17x8, tyres to 245, springs now 800lb with 32mm sway bars.
In T4 Spec Lines, Audi A4 V-6 (96-01) / Volkswagen Passat 2.8 V6 (96-05), change as follows: Wheel Size: "16 x 7 17 x 8" Tire Size: "225 245" Notes: "The following items must remain stock: shock/struts (including mounts), original wheels, and transmission differential - unless specified below. 800lb springs allowed. Front and rear sway bars permitted 32mm max."
fasterT4 Mini Cooper S R53 loses 50 lbs, to 2700 for both 02-04 and 05-06 model years.
In T4 Spec Lines, Mini Cooper S (02-04), change Weight as follows: "2750 2700" In T4 Spec Lines, Mini Cooper S (05-06), change Weight as follows: "2750 2700"
T4 Rules Clarification for Mazda RX8 Spec Line
#34395 from Colin Koehler · Rule change · TB 23-08 (2023-08 Fastrack)
neutralT3 Mazda RX-8 removes transmission/final drive pairing requirement; T4 removes same requirement, adds Mazdaspeed radiator and coil spring kit.
In T3 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change notes as follows: "Use of 2009 R3 transmission is permitted with alternate gear ratios as listed. R3 transmission must be paired with the listed alternate final drive. Front sway bar permitted 32mm MAX rear sway bar 19 MAX, Front springs max 750, 500 rear. Cold air intake permitted. Header permitted. Aftermarket flywheel and single disc clutch permitted with no weight penalty." In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change notes as follows: "Mazdaspeed radiator #0000-01-8501 allowed. Use of 2009 R3 transmission is permitted with alternate gear ratios as listed. R3 transmission must be paired with the listed alternate final drive. Mazdaspeed coil spring kit #QSEA-34-01Z allowed. 60mm flat plate restrictor required. OE Rear spoiler allowed #F151-V4-920F. OE front air dam allowed #F151-V4-900f-BB. Springs Allowed:
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(F) Mazda Motorsports- 0000- 04-9700-08 or Eibach- 0800.250.0700 (R) Mazda Motorsports- 0000-04-9400-07 or Eibach 0700.250.0400, and helper 0000-04-9926 allowed. Alternate sway bars allowed max 32mm (f) 19mm (r)."
T4 rule book corrections
#34437 from Chi Ho · Rule change · TB 23-08 (2023-08 Fastrack)
fasterT3 BMW 320i (14-15) gains aftermarket intercooler permission; T4 loses it.
In T3 Spec Lines, BMW 320i (14-15), add to Notes the following: "Aftermarket intercooler permitted." In T4 Spec Lines, BMW 320i (14-15), remove from Notes the following: "Aftermarket intercooler permitted."
T4 Ride Height Correction for the T3 Solstice.
#34615 from Joe Aquilante · Rule change · TB 23-08 (2023-08 Fastrack)
neutralT3 Pontiac Solstice GXP minimum ride height set to 3 inches.
In T2 Spec Lines, Pontiac Solstice GXP Coupe / Convertible (07-09), add to Notes the following: "Minimum ride height is 3 inches." In T3 Spec Lines, Pontiac Solstice GXP Coupe / Convertible (07-09), add to Notes the following: "Minimum ride height is 3 inches."
T4 Inclusion of similar car. (CLK 320)
#34626 from Patrick Morgan · Rule change · TB 23-09 (2023-09 Fastrack)
neutralT4 Mercedes Benz CLK 320 Coupe model years expand to 2000-2007, C320 Sedan added.
In T4 Spec Lines, Mercedes Benz CLK 320 Coupe (2004), change as follows: "Mercedes Benz CLK 320 Coupe, C320 Sedan (2004 2000-2007)
SRF3 SRF Radiator Rule Update
#34805 from Robey Clark · Rule change · TB 23-10 (2023-10 Fastrack)
neutralSRF radiator rule clarified: P/N 480466 replaceable with Automotive P/N 1R698, CU698 or manufacturer equivalent with documentation.
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."
P2 Correct Table 1 for Engine Date Range Specifications
#35182 from Formula/Sports Racing Committee · Rule change · TB 23-12 (2023-09 Fastrack)
neutralP2 Table 1 corrects engine date ranges and brand specifications for Stock and Modified engines across multiple car models.
In P2 Table 1, change as follows: P2 Table 1 (Spec Line Cars)
A specification table follows in the original; it is not shown here.
T4 Mazda MX-5 ND1 Spec Line Request
#34232 from Josh Smith · Rule change · TB 24-01 (2024-01 Fastrack)
slowerT4 Mazda MX-5 ND1 minimum weight increases 50 lbs to 2700; suspension springs now allow up to 500 lb front, 300 lb rear.
In T4 Spec Lines, Mazda MX-5 Miata/Club/ RF (16-18), change as follows: Weight: "2650 2700" Notes: "Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must remain stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from moving action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars allowed. Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000-04-9700-08, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR-EB (optional). Up to 500lb front and 300lb rear
#34706 from Robey Clark · Rule change · TB 23-09 (2023-09 Fastrack)
neutralSRF rain/brake light now requires Super Bright LEDs Inc. P/N PT-STRB-R24 with specific connector and rain light switch.
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."
SRF3 Update SRF Brake Light Rule v1
#34853 from Robey Clark · Rule change · TB 23-10 (2023-10 Fastrack)
neutralSRF requires Super Bright LEDs P/N PT-STRB-R24 rain/brake light with strobing capability and specific wiring.
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."
T4 BRZ/FRS/86 Spring Allowance
#35038 from Luis Goncalves · Rule change · TB 24-01 (2024-01 Fastrack)
neutralT4 BRZ/FRS/86 spring allowance clarified: 225 lb front and 300 lb rear springs permitted; non-OEM LSD allowed with +50 lbs penalty.
In T4 Spec Lines, Scion FR-S/10 series (13-16), change Notes as follows: "Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f) and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17” wheels permitted." In T4 Spec Lines, Subaru BRZ/ BRZ Limited (13-16), change Notes as follows: "Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f) and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top
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permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17” wheels permitted." In T4 Spec Lines, Subaru BRZ (17-21), change Notes as follows: "Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f) and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17” wheels permitted." In T4 Spec Lines, Toyota 86, GT (17-21), change Notes as follows: "Eibach 82105.320, 4.10582 and SPC 67660 allowed. Eibach 82105.320 sway bar kit allowed. Eibach 4.10582 springs or 225 lb (f) and 300 lb (r) springs allowed. SPC 67660 allowed. Front strut tower brace allowed. Raceseng, part # raceseng-ft86-r-shock-top permitted. Non-OEM limited slip differential allowed with +50 lbs. weight penalty. 55mm flat plate restrictor required. Only 17” wheels permitted."
STL Alternate Carburetor Request for 79-85 RX7 12a
#35181 from Dan Sheppard · Rule change · TB 24-01 (2024-01 Fastrack)
unclearSTL Mazda RX-7 12A (79-85) now allows auto-type 2 bbl with 42mm choke(s) on dual-y manifold as alternate to stock Nikki 4 bbl.
In STL Table B: Alternate Vehicle and Engine Allowances, Mazda RX-7 12A (79-85), change Notes as follows: "Street Porting of the engine only. Bridge porting, peripheral porting, and eyelash porting are prohibited. Contact SCCA National Office for details of Street porting. Stock Nikki 4 bbl carburetor on a stock manifold only. or auto-type 2 bbl w/42mm choke(s) on a “dual-y” manifold. Allow the standard removal of emissions related components, and allow air and fuel jets to be corrected. Modification of the water jacket in the area of the spark plug for cooling purposes is permitted."
T4 TSX Allowance
#35219 from Oscar Jackson · Rule change · TB 24-01 (2024-01 Fastrack)
fasterT4 Acura TSX 2004-2008 now allows header.
In T4 Spec Lines, Acura TSX (2004-2008), add to Notes the following: "Header allowed."
P2 E&O - Clarify B.1 modified engine range in AMAC spec lines
#35225 from Club Racing Board · Rule change · TB 24-01 (2024-01 Fastrack)
neutralP2 AMAC modified engine range clarified to 2008 and older stock engines only, restrictor 38mm, weight 1025 lbs.
In P2 Table 1, change as follows: P2 Table 1 (Spec Line Cars)
A specification table follows in the original; it is not shown here.
T4 Requested Update of Model Years of 370Z
#35231 from Richard Kulach · Rule change · TB 24-01 (2024-01 Fastrack)
neutralT3 Nissan 370Z model years expanded to include NISMO Edition through 2022.
In T3 Spec Lines, Nissan 370Z (09-16) / 370Z NISMO Edition (09-13), change model as follows: "Nissan 370Z (09-16) / 370Z NISMO Edition (09-13) ,incl. Nismo (2009-2022)"
SRF3 SRF / SRF3 Rule Updates
#35268 from Robey Clark · Rule change · TB 24-01 (2024-01 Fastrack)
neutralSRF 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.
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:
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"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.
P2 Replacement Engine Crankcase for 07/08 Suzuki GSX-R1000 Engines
#35340 from Michael A Reupert · Rule change · TB 24-01 (2024-01 Fastrack)
unclearP2 Suzuki GSX-R1000 07/08 engine crankcase may swap to GSX-S1000 16/19 part #11301-04840.
In P2 Engine Table, Spec Line B.1, add to notes as follows: "No modifications allowed on engines manufactured after 2008 model year. 2007-2008 Suzuki GSX-R1000 crankcase part #11300-21860 may be replaced with 2016-2019 Suzuki GSX-S1000 crankcase part #11301-04840."
STL ST Electric-Assisted Steering Systems
#35066 from Jose Osiris Pena · Rule change · TB 24-02 (2024-01 Fastrack)
neutralSTL and STU power steering rules clarified to permit electric-assisted and hydraulic-assisted steering systems.
In GCR, Section 9.1.4.M.16., change as follows: "Power steering may be modified in any of the following ways: a. disconnected , pump, belt, pulley, and hoses may be removed. Hoses may also be looped. Steering rack or box may be modified internally to work without pump. b. an OEM manual steering rack for that model may be fitted c. an electric power steering pump may be fitted d. an OEM electric-assisted steering system may be used or any column mounted electric steering assist may be used e. an OEM hydraulic-assisted steering system may be used"
STL BOP Adjustments
#35112 from Super Touring Committee · Rule change · TB 24-02 (2024-01 Fastrack)
fasterSTL Acura/Honda B-series and Mazda MZR restrictors reduced 2mm; minimum weights down 25–75 lbs for 1900–2000cc engines.
In GCR, 9.1.4.H.1., change as follows: "Minimum weights for cars with normally aspirated piston engines will be determined by 1.35 lbs/cc displacement for the installed engine (see the following table). Displacement is the factory displacement for the installed engine. For the purpose of weight assignment, engine displacement will be rounded to the nearest 50cc (e.g., 2176cc = 2200cc and 2175cc = 2150cc)." In GCR, 9.1.4.H.1., change Minimum Weight on Chart as follows: Factory Engine Displacement 1900: "Effective 3-1-24: 2565 2540" Factory Engine Displacement 1950: "Effective 3-1-24: 2633 2583"
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Factory Engine Displacement 2000: "Effective 3-1-24: 2700 2625" In GCR, 9.1.4.H.3., change as follows: "Front wheel drive cars with a strut type front suspension may reduce their minimum weight by 2.5 percent. Effective 3- 1-24: Front wheel drive cars with 95" or less wheelbase must add 1.25% to their minimum weight." In STL Spec Lines, change Notes as follows: Acura/Honda B16: "Effective 3-1-24: 53 51mm" Acura/Honda B17: "Effective 3-1-24: 53 51mm" Acura/Honda B18C1: "Effective 3-1-24: 53 51mm" Acura/Honda B18C (JDM Type R), B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R): "Effective 3-1-24:52 50mm" Mazda MZR: "Effective 3-1-24: 52 50mm"
T4 More Car Lightening Stuff
#35319 from Scotty B White · Rule change · TB 24-02 (2024-02 Fastrack)
In GCR, Section 9.1.9.2.D.1.g.3., change as follows: "Batteries may be replaced provided the replacement is capable of starting the car. Batteries may not be relocated unless noted on the spec line. Batteries must be adequately secured. Battery labeling must conform to 9.3.35.D. with those of an alternate manufacturer, provided they are of similar amp-hour capacity, size and within 10% of OEM weight."
STL Mazda 12A
#35320 from Super Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)
slowerSTL Mazda 12A must keep 5th and 6th intake port actuators and valves, no longer allowed removal or disabling.
In STL Spec Lines, Table A, Mazda 12A, change Notes as follows: "The 5th and 6th intake port actuators and valves may be removed or disabled."
neutralT4 Mazda MX-5 Miata/Club (16-18) and (19-21) permitted to replace 3rd and 4th gears with specific parts.
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), add to Notes the following: "3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804- 02, 0000-02-5804-01)." In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), add to Notes the following: "3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804- 02, 0000-02-5804-01)."
Applies to Mazda Miata on this page: Oscar Jackson, Kristina Etherington, Kayla Etherington
neutralT4 now permits C-Spec cars to compete alongside B-Spec cars.
In GCR, Section 9.1.9.2., change as follows: "Touring car eligibility: Cars are eligible for the class they are listed with a specification line and with the specific allowances permitted. In addition, T2-T4 cars may race one class up in touring classes above their specification line class as long as they are a legal T2-T4 car and conform to their specification line allowances as classified. Cars conforming to C-Spec rules are permitted to compete in Touring 4."
neutralT2-T4 spec lines for 46 cars expire 12/31/24; appeal required to continue.
In T2-T4 Spec Lines, add **This Spec line will expire 12/31/24, Please submit to appeal** to Notes to the following Spec Lines: T2: Acura TL SHAWD (10-13) Audi S4 (12-14) Audi S5 (13-14) Audi TT RS (2018-) Cadillac ATS-V (16-17)
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Cadillac CTS-V (06-07) Chevrolet Camaro SS (98-02) Honda Civic (2017-) Saturn Sky / Convertible (07-09) Subaru Impreza WRX STi (03-07) Subaru Impreza WRX STi (08-11) T3: Audi S4 (10-11) Audi S4 (12-14) Audi TTS Coupe (10-11) Cadillac ATS (2015) Chevrolet Cobalt (05-07) Dodge SRT-4 (03-05) Ford Fiesta ST (2014-) Hyundai Genesis Coupe (2010-) Hyundai Veloster Turbo (18-21) Mazda RX-8 Base/R3/Sport/ GT (04-12) Mini Cooper S (2016-) Subaru WRX (02-05) Toyota Camry (11-15) T4: Acura Integra GS-R VTEC (3 or 4 door) (94-01) Audi A4 V-6 (96-01) / Volkswagen Passat 2.8 V6 (96-05) BMW 320i (14-15) Chevrolet Cobalt SS, Sport Coupe (06-10) Chevrolet Sonic RS (2011-) Chrysler/Dodge Neon ACR SOHC (4 door) (01-02) Dodge Dart (14-15) Dodge/Plymouth Neon ACR SOHC/DOHC (2/4 door) (95-99) Fiat 500 Abarth (12-14) Ford Focus SVT (02-04) Ford Focus ZX4 ST (05-06) Ford Focus (08-11) Ford Mustang V-6 (01-04) Honda Accord LX & EX (03-07) Honda Accord LX-S/EX/EX-L (08-12) Honda Civic Coupe Si (99-00) Honda Civic SI (02-03) Hyundai Elantra GLS (11-12) Hyundai Tiburon V-6 (03-08) Hyundai Veloster Turbo/ R-Spec (14-15) Kia Forte Koup and Sedan LX/EX (10-13) Kia Forte Koup and Sedan SX (10-13) Kia Forte Koup (14-15) Mazda Protégé ES (2000) Mazda Protégé 5 (02-03)
Cal Club 2024 → Cal Club 2025 2024-02-23 to 2025-02-22
neutralT4 Mazda RX-8 allows Mazdaspeed radiator, coil spring kit, OE rear spoiler, front air dam, springs to 700 lb front/400 lb rear, oil metering pump bypass, sway bars to 32 mm front/19 mm rear.
In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), change Notes as follows: "Mazdaspeed radiator #0000-01-8501 allowed. Mazdaspeed coil spring kit #QSEA-34-01Z allowed. OE Rear spoiler allowed #F151-V4-920F. OE front air dam allowed #F151-V4-900f-BB. Springs allowed 700lb (f) max, 400(r) max. Oil metering pump may be bypassed. Alternate sway bars allowed max 32mm (f) 19mm (r)."
T4 Allow T4 and T3 RX8 to Disable/Remove Factory Oil Inj.
#35761 from David Mead · Rule change · TB 24-05 (2024-05 Fastrack)
unclearT3 and T4 Mazda RX-8 may remove or disable factory oil injection system.
In T3 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), add to Notes as follows: "OEM oil injection system may be removed or disabled." In T4 Spec Lines, Mazda RX-8 Base/R3/Sport/ GT (04-12), add to Notes as follows: "OEM oil injection system may be removed or disabled."
P2 CN Spec ECU
#35835 from Bart Wolf · Rule change · TB 24-05 (2024-05 Fastrack)
In P2 Engine Table, Spec Line E, change the notes as follows: "No engine modifications except for dry sump oil system, ECU mapping, and exhaust system the following: oil system, ECU, and exhaust are unrestricted."
T4 2023 ND2 Miata Classification and Allowances
#35837 from Coyote Black · Rule change · TB 24-05 (2024-05 Fastrack)
slowerT4 Mazda MX5 Miata/Club/RF year range extended to 2024, suspension package permitted with 100 lbs weight increase.
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), change Year as follows: "(19-21 24)" In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-21), add to Notes as follows: "Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000-04-9700- 08, springs up to 500lb front and 300lb rear allowed. Mazda tower brace 0000-04-5626 allowed."
T4 Errors and Omissions for 06-09 VW Rabbit Rotor
#35851 from Andrew Burke · Rule change · TB 24-05 (2024-05 Fastrack)
fasterT4 Volkswagen Rabbit 2.5 (06-09) front brakes increase from 228 to 288 vented disc.
#35900 from Club Racing Board · Rule change · TB 24-05 (2024-05 Fastrack)
neutralP2 FIA Group CN spec notes clarified: Series changed to Challenge, documentation requirement moved to online link.
In P2 Table 1, FIA Group CN spec line, change the notes as follows: "FIA Group CN homologated chassis, brake calipers and discs, hub carriers, and suspension components are required. V de V European Proto Endurance Series Challenge permitted bodywork, rear diffuser, wing, wheels, and assisted shifting are allowed. Car M must comply with all other P2 requirements. Competitors must have copies of FIA Group CN Technical Regulations and V de V European Proto Endurance Series Challenge Sporting and Technical Regulations in their possession and present them upon request are available here: https://www.scca.com/pages/technical-forms-and-downloads."
T4 Driveshafts
#35916 from Scotty B White · Rule change · TB 24-05 (2024-05 Fastrack)
slowerT2, T3, T4 driveshafts may use alternative materials or one-piece units; non-OEM adds 25 lbs.
In GCR Section 9.1.9.2.D.4.b., add the following: "6. T2-T3- Driveshafts may be replaced with alternative materials ie. carbon fiber, aluminum, steel. Two-piece driveshafts may be replaced with one-piece units. If non-OEM driveshaft is used, add 25 lbs."
fasterT4 Mazda MX-5 Miata/Club 16-18 removes differential stock requirement, allows up to 500lb front and 300lb rear springs.
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Notes as follows: "Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must remain stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from moving action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars allowed. Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000- 04-9700-08, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR-EB (optional). Up to 500lb front and 300lb rear springs allowed. Mazda Motorsports Header part #0000-06-5410 allowed. Mazda tower brace 0000-04-5626 allowed."
Applies to Mazda Miata on this page: Oscar Jackson, Kristina Etherington, Kayla Etherington
T4 Allow OEM Front Spoiler 06-08 Miata in T4
#35941 from David Mead · Rule change · TB 24-06 (2024-06 Fastrack)
fasterT4 Mazda MX-5 Club 06-15 now permits OEM front spoiler NF51-V4-900F.
In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), add to Notes the following: "Front spoiler permitted (NF51-V4-900F)."
Applies to Mazda Miata on this page: Oscar Jackson
T4 T4 Mustang Weight Reduction In T4 Spec
#36051 from Scotty B White · Rule change · TB 24-06 (2024-06 Fastrack)
fasterT4 Ford Mustang V6 (05-10) weight reduced 50 lbs to 3225.
Lines, Ford Mustang V6 (05-10), change as follows: Weight: "3275 3225" Notes: "14” Brembo Brake Kit#M-2300-S permitted."
fasterT4 Mini Cooper S 02-04 and 05-06 now allow Milltek exhaust manifold #SSXM459 and 25mm rear sway bar.
T4 Spec Lines, Mini Cooper S (02-04), add to Notes the following: "Milltek exhaust manifold #SSXM459 allowed. 25mm rear sway bar allowed." T4 Spec Lines, Mini Cooper S (05-06), add to Notes the following: "Milltek exhaust manifold #SSXM459 allowed. 25mm rear sway bar allowed."
SRF3 SRF3 Alternator Pulley Update In
#36095 from Robey Clark · Rule change · TB 24-06 (2024-06 Fastrack)
fasterSRF3 alternator pulley minimum weight reduced from 12 oz to 11 oz.
SFR3, GCR section 9.1.8.D.2.H.17, change as follows: "Alternator Pulley: P/N G902130, or P/N G902130A, or P/N G902131 (six row). 12 11 oz minimum weight."
T4 Mustang T2/T3
#35877 from Scotty B White · Rule change · TB 24-07 (2024-07 Fastrack)
unclearFord Mustang GT 5.0L and V6 now permit Track/Performance Package parts in T2 and T3.
In T2 Spec Lines, Ford Mustang GT 5.0L (15-17), add to Notes as follows: "Track/Performance Package parts permitted." In T2 Spec Lines, Ford Mustang GT 5.0L (2018-), add to Notes as follows: "Track/Performance Package parts permitted." In T3 Spec Lines, Ford Mustang V6 (15-17), change Notes as follows: "Track/Performance package allowed."
T4 Homologation of car to T4
#36030 from Patrick E Morgan · Rule change · TB 24-07 (2024-07 Fastrack)
neutralMercedes C300 4Matic 2008-2011 homologated to T4 at 3,725 lbs with 18x8.5 wheels, 245 max tires, 3.27 final drive.
In T4 Spec Lines, Mercedes C300 4Matic (2008-2011), classify as follows:
A specification table follows in the original; it is not shown here.
T4 T2-T4 Driveshaft Mistake...?
#36050 from Scotty B White · Rule change · TB 24-07 (2024-07 Fastrack)
fasterT2-T4 Ford Mustangs: remove 25 lbs penalty for non-OEM driveshaft, clarify alternate driveshaft allowances.
In GCR Section 9.1.9.2.D.4.b.6., remove as follows: "If non-OEM driveshaft is used, add 25 lbs." In T2 Spec Lines, Ford Mustang V6 (11-14), change Notes as follows: "Driveshaft from Alternate metallic driveshaft is allowed." In T2 Spec Lines, Ford Mustang Boss 302 (12-13), change Notes as follows: "Alternate metallic driveshaft is allowed." In T2 Spec Lines, Ford Mustang GT 5.0L (11-14)ki, change Notes as follows: "Alternate metallic driveshaft is allowed."
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In T2 Spec Lines, Ford Mustang GT 5.0L (15-17), change Notes as follows: "Alternate metallic driveshaft is allowed." In T2 Spec Lines, Ford Mustang GT 5.0L (2018-), change Notes as follows: "Alternate metallic driveshaft is allowed." In T2 Spec Lines, Ford Mustang Coupe GT & Shelby GT 4.6L (05-10), change Notes as follows: 'An Aluminum driveshaft is allowed." "Alternate metallic driveshaft is allowed." In T3 Spec Lines, Ford Mustang Coupe GT & Shelby GT 4.6L & Cal. Special (05-10), change Notes as follows: "An Aluminum driveshaft is allowed." "Alternate metallic driveshaft is allowed." In T3 Spec Lines, Ford Mustang V6 (11-14), change Notes as follows: "Driveshaft from Alternate metallic driveshaft is allowed."
T4 MINI Cooper S Spec Lines Corrections.
#36086 from David Oliveira · Rule change · TB 24-07 (2024-07 Fastrack)
neutralT4 Mini Cooper S (02-04) deleted; (05-06) model year corrected to R53; (07-13) R56 simplified specs; (2014-2023) added with spring rates.
In T4 Spec Lines, Mini Cooper S (02-04), delete spec line in its entirety. In T4 Spec Lines, Mini Cooper S (05-06), change Model as follows: "Mini Cooper S R53 (0205-06)" In T4 Spec Lines, Mini Cooper S (07-13), change Model and Notes as follows: "Mini Cooper S R56 (07-13)" Notes: "The following items must remain stock: shock/struts (including mounts), original wheels, and transmission differential - unless specified below. Convertible model not allowed. Factory optional limited slip differential allowed. JCW struts (F) 31 31 6 768 410 (R)33 52 6 768 412, springs (F)31 33 6 768 415 (R)33 53 6 768 418. May de-camber
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wheels by the use of slotted adjusters at the top of the strut mounting plates. They shall be located on the existing chassis structure, utilizing the manufacturers original bolt holes and may not serve as reinforcement for that structure. Any spring up to a maximum spring rate of 500 lbs. front and 800 lbs. rear may be used. Wheels conforming to B-spec rules are permitted." In T4 Spec Lines, Mini Cooper S (2016-), change Model and add to Notes as follows: "Mini Cooper S (20142016-2023)" Notes: "Convertible model not allowed. Any spring up to a maximum spring rate of 500lbs. front and 800lbs. rear may be used."
T4 Allow Removal of Sound Tubes
#36130 from Coyote Black · Rule change · TB 24-07 (2024-07 Fastrack)
fasterT4 OEM intake chambers, resonators and acoustic devices may be removed if ports sealed and before restrictor.
In GCR Section 9.1.9.2.D.1.b., add the following: "2. OEM intake- Chambers, resonators and acoustic devices may be removed, provided; that their ports are located prior to any required restrictor, their ports are completely sealed, and that the part serves no other purpose."
T4 B8/8.5 Audi S4 T3 and T2
#36195 from Brian Leib · Rule change · TB 24-07 (2024-07 Fastrack)
neutralAudi S4 (2000-2002) moves to T3 with 3400 lbs minimum weight, 38mm turbo inlet restrictor required.
In T3 Spec Lines, Classify Audi S4 (2000-2002) as follows and allow the T2 spec line to expire.
A specification table follows in the original; it is not shown here.
SRF3 Update Rain Tire Rule and Hoosier Decal Placement
#36436 from Robey Clark · Rule change · TB 24-08 (2024-08 Fastrack)
slowerSRF wet tires: P185/60R13 H20/W2 option removed; P185/65R13 W2 front now required with P205/60R13 W2 rear.
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
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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."
SRF3 Update to Letter 36619 with new Hoosier Contingency Decal Info
#36624 from Robey Clark · Rule change · TB 24-09 (2024-09 Fastrack)
neutralSRF Hoosier decal requirement reduced from four decals in specific locations to three decals with simpler placement rules.
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."
SRF3 Update SRF3 Air Filter Rule
#36681 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)
unclearSRF3 air filter rule removes K&N RC-9160 option, leaving only P/N WM301020 allowed.
In SRF, GCR section 9.1.8.D.2.H.23, change as follows: "Air Filter: P/N WM301020 or K&N RC-9160"
SRF3 Update SRF Brake Rotor Thickness
#36687 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)
slowerSRF brake rotor minimum thickness increases from 12.20mm to 13.25mm, Wilwood vented rotor P/N 800065.
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”)."
SRF3 Hoosier Tire Decal Placement
#36739 from Robey Clark · Rule change · TB 24-10 (2024-10 Fastrack)
neutralSRF3 Hoosier logo placement changes from four decals to three decals in different locations.
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."
neutralT4 Honda Civic Si 06-11 permitted to use LSD per category rules.
In T4 Spec Lines, Honda Civic Si (06-11), add to Notes the following: "LSD is permitted according to category rules."
T4 Redundant Verbiage Regarding Mustang Spec Lines for Driveshaft
#36484 from David Mead · Rule change · TB 24-12 (2024-12 Fastrack)
neutralT2 and T3 Mustang spec lines remove redundant driveshaft alternate/aluminum allowance wording.
In T2 Spec Lines, change Notes as follows: Ford Mustang V6 (11-14): "Alternate driveshaft is allowed." Ford Mustang Boss 302 (12-13): "Alternate driveshaft is allowed." Ford Mustang GT 5.0L (11-14): "Alternate driveshaft is allowed." Ford Mustang GT 5.0L (15-17): "Alternate driveshaft is allowed." Ford Mustang GT 5.0L (2018-): "Alternate driveshaft is allowed. Springs up to 800#/in front and rear permitted. Alternate metallic driveshaft permitted." Ford Mustang Coupe GT & Shelby GT 4.6L (05-10): "Alternate driveshaft is allowed."
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In T3 Spec Lines, change Notes as follows: Ford Mustang Coupe GT & Shelby GT 4.6L & Cal. Special (05-10): "Alternate driveshaft is allowed." Ford Mustang V6 (11-14): "Alternate driveshaft is allowed." Ford Mustang V6 (05-10): "An Aluminum driveshaft is allowed."
fasterT4 Mini Cooper S R53 now allows Alta 15% Pulley #AMPENG20X.
In T4 Spec Lines, Mini Cooper S R53 (02-06), add to Notes as follows: "Alta 15% Pulley #AMPENG20X allowed."
T4 Allowable Wheel Offset
#36855 from Robert Maples · Rule change · TB 24-12 (2024-12 Fastrack)
neutralT4 removes restriction on aftermarket wheel weight minimum of 15 lbs.
In GCR Section 9.1.9.2.D.7. Wheels and Tires, change as follows: "a. Wheels 1. Any type wheel suitable for competition may be used, provided: a. Any wheel not exceeding the specified diameter and rim width on the vehicle’s specification line may be used. Each wheel, measured without weights, must weigh at least 15 lbs. b. Wheels are permitted any offset provided the tire tread (that portion of the tire that contacts the ground) does not protrude beyond the fender opening when viewed from 9.1.9.2.Touring (T2-T4) Category Specifications GCR - 660 the top perpendicular to the ground, unless specified differently on the individual spec line for that car. To determine compliance the vehicle should be
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rolled through a powdered substance, as raced with driver, in order to indicate the tire tread contact patch under static conditions. When a maximum tire size is listed on a vehicle’s specification line, aspect ratio is open and any tire may be used that does not exceed the stated maximum section width. c. Cars equipped with lug bolts may convert to wheel studs and lug nuts. d. Wheel studs may be replaced with longer studs as necessary to fit optional wheels. Wheel spacers may be used for purposes of adjusting track. e-T4 only: (unless specified on spec line) Any aftermarket wheel with a minimum weight of 15 lbs allowed."
neutralT2, T3, T4 fuel cell installations may remove charcoal canisters, emissions valves, and sensors.
In GCR, Section 9.1.9.2.D.1.c. add the following: "5. Removal of ancillary fuel tank equipment charcoal canisters, emissions valves, and sensors allowed for OEM or aftermarket fuel cell installations."
neutralT2, T3, T4 brake component wording clarified: 2-piece rotors allowed in T2 within 5% OE diameter, T3 within 2% OEM diameter.
In GCR, Section, 9.1.9.2.D.6. Brakes, change as follows: "a. Components 1. The make and material of brake pads and linings may be changed. 2. Brake fluid may be substituted with any brake fluid. 3. Brake rotor dust shields may be removed or replaced to accommodate brake ducts. 4. Flexible rubber brake lines may be replaced with Teflon lined, metal braided hoses. 5. Any brake ducts are permitted, but they must serve no other purpose. Fender liners may be modified solely for routing and attachment of brake ducts. Duct intake openings may be created by the opening of 2 sections up to 14.5 square inches each in
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the front fascia. The stock headlamp location is not permitted for brake ducting. Two alternative duct openings may be created by the removal of the fog lights or 2 sections up to 14.5 square inches each of stock false grills originally located in the front fascia. 6. Stock replacement brake rotors may be obtained from sources other than the manufacturer provided they are the exact equivalent of the stock rotors. In T2 only - 2-piece rotors with ferrous metal rotor disks and aluminum hats are allowed, must be within 5% of OE diameter. In T3 only - 2-piece front rotors with ferrous metal rotor disks and aluminum hats are allowed, must be within 2% of OEM diameter. Drilled and slotted rotors are permitted. 7. Parking brakes, mechanisms, and actuating components may be removed. 8. Brake vacuum reservoirs sized 0.50 gallons or smaller are permitted. The port or fitting at the vacuum source may not be modified, enlarged or relocated. The vacuum reservoir and brake booster must be a closed system."
neutralT2, T3, T4 fuel cell cars may remove charcoal canisters, emissions valves, and sensors.
In GCR, Section, 9.1.9.2.D.1.c., add the following: "5. Removal of ancillary fuel tank equipment; charcoal canisters, emissions valves, and sensors allowed for OEM or aftermarket fuel cell installations."
STL Request to Remove Miata Hubs from General category
#37138 from Christopher Childs · Rule change · TB 24-12 (2024-12 Fastrack)
neutralSTL/STU: 90-05 Mazda Miata alternate front wheel hubs moved from General to specific part approval.
In GCR, Section 9.1.4.M.18., change as follows: "18. Allow alternate front wheel front hubs, Mazda Motorsports Development Part #0000-04-5HUB-S1, for the 90-05 Mazda Miata: Mazda Motorsports Development Part #0000-04-5HUB-S1."
#37140 from Chris Braunlich · Rule change · TB 24-12 (2024-12 Fastrack)
neutralT3 and T4 Mazda RX-8 and MX-5 permit transmission kit #0000-02-5700.
In T4 Spec Lines, add the following to Notes: Mazda RX-8 Base/R3/Sport/ GT (04-12): "Transmission kit # 0000-02-5700 permitted. Mazda MX-5 / Club Model (06-15): "Transmission kit # 0000-02-5700 permitted." In T3 Spec Lines, add the following to Notes: Mazda MX-5 / Club Model (06-15): "Transmission kit # 0000-02-5700 permitted." Mazda RX-8 Base/R3/Sport/ GT (04-12): "Transmission kit # 0000-02-5700 permitted."
T4 Move Spec Boxster to T4
#37158 from Rob Piekarczyk · Rule change · TB 24-12 (2024-12 Fastrack)
neutralPorsche Spec Boxster moves to T4, minimum weight 2750 lbs, requires 3 Super Tour events before Runoffs eligibility.
In T4 Spec Lines, classify Porsche Spec Boxster, as follows:
A specification table follows in the original; it is not shown here.
Applies to Porsche Boxster on this page: Lynne Griffiths
slowerP2 2000cc Pinto engine car minimum weight set to 1335 lbs.
In P2 Engine Table, Line E Note 2, add the following: "8. Minimum weight 1335 lbs."
T4 3.7 Mustangs to T4
#37188 from Scotty B White · Rule change · TB 24-12 (2024-12 Fastrack)
neutralFord Mustang V6 (05-14) newly classified to T4 with 50mm restrictor, 3400 lbs minimum weight.
In T4 Spec Lines, classify Ford Mustang V6 (05-14), as follows:
A specification table follows in the original; it is not shown here.
T4 BMW 320i Spec Line
#37204 from chi ho · Rule change · TB 24-12 (2024-12 Fastrack)
neutralT4 BMW 320i 14-15 Spec Line expires 12/31/24 removed; Turner Motorsports intercooler #024703TMS02 allowed.
In T4 Spec Lines, BMW 320i (14-15), change Notes as follows: "**This Spec line will expire 12/31/24, Please submit to appeal** Turner Motorsports intercooler #024703TMS02 allowed."
T4 MX5 2006-2015 NC Help
#37221 from Richard Mooney · Rule change · TB 24-12 (2024-12 Fastrack)
unclearUnable to summarize: rule changes specified in letter #37281, not provided.
Thank you for your letter. Please see changes in letter #37281 in current Fastrack.
T4 Classification for a 2005 Cadillac CTS 3.6 liter 6 speed manual
fasterT4 Honda Civic Si 06-11 minimum weight drops 50 lbs to 2900, restrictor clarified.
In T4 Spec Lines, Honda Civic Si (06-11), change as follows: Required Restrictor: "55mm flat plate restrictor required." Min Weight: "2950 2900" Notes: "The following items must remain stock: transmission differential - unless specified below. 55mm flat plate restrictor required. LSD IS PERMITTED ACCORDING TO CATEGORY RULES"
neutralT4 NC MX-5 06-15 removes SM5 suspension allowance, clarifies Mazda Motorsports LSD part number, adds weight penalty for other LSDs.
In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), change Notes as follows: "Factory bolt-in roll bar/cross member may be removed to facilitate roll cage installation. MSR option permitted. Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front spring mount PT#-0000-04-5259, front springs #0000-04-9700-08, rear spring mount PT#-0000-04-5258, rear springs #0000-04-9400-07, helper springs #0000-04-HLPR- EB (optional), Swaybar kit – PT#-0000-04-5306-EB that includes (front sway bar kit PT#0000-04- 5306-FT, rear sway bar kit PT#- 0000-04-5306-RR), offset front camber bushing PT#-0000-04- 5407-NC. Mazda Motorsports cold air intake part #0000-06-5150- KT allowed. Mazda Motorsport RX8 rear Hub Conversion kit part number 0000-04-5811-KT allowed, RX8 front hubs PT# F189-33- 04X allowed. The SM5 suspension (only) is allowed with a 100 lbs. weight increase. Allow Mazda header part numbers 0000-06-
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5407 or 0000-06-5407-NC. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop and part #0000-07-5901- CC. Aftermarket power steering reservoir is allowed. Mazda Transmission kit part # 0000-02- 5700. Mazda Motorsports LSD #3265 5 0000-02-5564 permitted without penalty. Any other non-OEM limited slip differential allowed with +50 lbs. weight penalty. Front spoiler permitted (NF51-V4-900F)."
Applies to Mazda Miata on this page: Oscar Jackson
T4 ND MX-5 wheel allowance
#37279 from Josh Smith · Rule change · TB 24-12 (2024-12 Fastrack)
unclearT4 Mazda MX-5 Miata/Club (16-18) wheel size changes to 17 x 7.5 inches.
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Wheel Size as follows: "17 x 7.5"
Applies to Mazda Miata on this page: Oscar Jackson, Kristina Etherington, Kayla Etherington
In T2, Effective 1/1/2025, delete for following Spec Lines in their entirety: "Acura TL SHAWD (10-13) Audi S4 (12-14) Audi S5 (13-14) Audi TT RS (2018-) Cadillac ATS-V (16-17) Cadillac CTS-V (06-07) Chevrolet Camaro SS (98-02)
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Honda Civic Type-R (2017-) Saturn Sky / Convertible (07-09)" In T3, Effective 1/1/2025, delete for following Spec Lines in their entirety: "Audi TTS Coupe (10-11) Cadillac ATS (2015) Chevrolet Cobalt (05-07) Dodge SRT-4 (03-05) Ford Fiesta ST (2014-) Hyundai Genesis Coupe (2010-) Hyundai Veloster Turbo (18-21) Mini Cooper S (2016-) Toyota Camry (11-15)" In T4, Effective 1/1/2025, delete for following Spec Lines in their entirety: "Acura Integra GS-R VTEC (3 or 4 door) (94-01) Audi A4 V-6 (96-01) / Volkswagen Passat 2.8 V6 (96-05) Chevrolet Cobalt SS, Sport Coupe (06-10) Chevrolet Sonic RS (2011-) Chrysler/Dodge Neon ACR SOHC (4 door) (01-02) Dodge Dart (14-15) Dodge/Plymouth Neon ACR SOHC/DOHC (2/4 door) (95-99) Fiat 500 Abarth (12-14) Ford Focus SVT (02.5-04) Ford Focus ZX4 ST (05-06) Ford Focus (08-11) Ford Mustang V-6 (01-04) Honda Accord LX & EX (03-07) Honda Accord LX-S/EX/EX-L (08-12) Honda Civic Coupe Si (99-00) Honda Civic SI (02-03) Hyundai Elantra GLS (11-12) Hyundai Tiburon V-6 (03-08) Hyundai Veloster Turbo/ R-Spec (14-15) Kia Forte Koup and Sedan LX/EX (10-13) Kia Forte Koup and Sedan SX (10-13 Kia Forte Koup (14-15) Mazda Protégé ES (2000) Mazda Protégé 5 (02-03) Mazda6 s (03-07) Mitsubishi Eclipse GT (00-05) Nissan Sentra SER (02-03) Pontiac Firebird V-6 (96-02) Scion tC (03-07) Subaru Impreza (non-turbo) (04-06) Toyota Celica GT (00-05) Toyota Celica GTS/GT (00-05) Volkswagen Golf TDI (2010) Volkswagen Passat (12-14) Volkswgen Passat TDI (12-14) Volkswgen Passat 1.8T (2014-)"
neutralT4 Ford Mustang V6 (05-14) final drive set to 3.45, GT/CS front bumper cover permitted with front fascia.
In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows: Final drive: "3.45" Notes: "GT/CS front bumper cover #AR3Z-17D957-BA, allowed if used with front fascia."
T4 Request to Classify Club Spec in Appropriate Touring Classes
#37523 from Andrew Benagh · Rule change · TB 25-02 (2025-02 Fastrack)
neutralFord SCCA Club Spec Mustang classified T3 at 3350 lbs with driver; Mazda SCCA Club Spec MX-5 classified T4 at 2500 lbs with driver.
In T3 Spec Lines, classify Ford SCCA Club Spec Mustang (CSM) as follows:
A specification table follows in the original; it is not shown here.
Applies to Mazda Miata on this page: Oscar Jackson
Cal Club 2025 → Cal Club 2026 2025-02-22 to 2026-02-21
SRF3 Driver Safety & Comfort
#37966 from Robey Clark · Rule change · TB 25-04 (2025-04 Fastrack)
neutralSRF drivers with disabilities may modify seat and controls for safety and comfort with approval and logbook notation.
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."
SRF3 Update SADEV transmission specs
#37992 from Club Racing Board · Rule change · TB 25-04 (2025-04 Fastrack)
unclearSTL Mazda MX5 Challenge minimum weight now references GCR 9.1.7.1 instead of 2500 lbs; spec components removed, only alternative tires allowed.
In STL Spec Lines, Table B, Mazda Spec MX5 Challenge, change as follows: Minimum Weight: "2500 See 9.1.7.1." Notes: "Mazda MX5 Challenge car must utilize the following components: Roush CNC cylinder head 0000-01-5300,Mahle standard or +0.005 0000-01-5310, OEM camshaft, 11:1 compression ratio, header 0000-06-5407-NC, exhaust 0000-06-5427-NC, cold air intake 0000- 06-5150-KT, ECU flash 0000-01-5379, Pagid front brake pads 0000-03-5104-SP or endurance pads 0000-03- 5104-EN, Pagid rear brake pads 0000-03-5114-SP or endurance pads 0000-03-5114-EN, Penske front shock 0000-04-5291-SA, Penske rear shock 0000-04-5292-SA, Penske rear mount kit 0000-04-5358, Front mount kit 0000-04-5359, Front offset bushing 0000-04-5407-NC, Eibach front springs 0000-04-9700-08, Eibach rear springs 0000-04-9400-07, Eibach helper springs 0000-04-
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9926, Eibach front sway bar 0000-04-5306-FT, Eibach rear sway bar 0000-04-5306-RR, Interior finish panels 0000-07-5822, C&R radiator/oil cooler assembly 0000-01-5504-CR, Oil cooler adapter and lines 0000-01-5511-KT, ACT clutch 0000-02-5004-G6, wheels 17x8 #0000-04-5706-GM, # 0000- 04-5706-SL, and Toyo RR 235-40-17 dry, Toyo RA1 235-40-17 wet. Alternative tires on 17x7 wheels per STL rules. No other Super Touring modifications or allowances permitted except as noted in this spec line. Must conform completely to GCR 9.1.7.1, except alternative tires (only) per STL regs allowed."
Applies to Mazda Miata on this page: Jared Korth, Ricardo Arruda, Gavin Wardle, Ryan Gutile, Bryce Johnson, Andy Chittum, Adrian Comstock
T4 Correct Ring and Pinion Ratio to T3, Sorry I Mean T4 3.7 V6 Stang
#38041 from David Mead · Rule change · TB 25-05 (2025-05 Fastrack)
neutralT4 Ford Mustang V6 05-14 allows GT 8.8 rear axle or 7.5 axle with 3.45:1 ratio.
In T4 Spec Lines, Ford Mustang V6 (05-14), add to Notes the following: "GT 8.8 rear axle assembly allowed. 3.45 or 3.55 final drive ratio allowed. 7.5 rear axle assembly with 3.45:1 final drive allowed."
T4 T4 Mustang
#38058 from Scotty B White · Rule change · TB 25-05 (2025-05 Fastrack)
neutralT4 Ford Mustang V6 05-14 now permits OEM style rear deck spoiler similar to Laguna/CS packages.
In T4 Spec Lines, Ford Mustang V6 (05-14), add to Notes as follows: "OEM style rear deck spoiler similar to Laguna/CS packages permitted.”
T4 T4 Mustang
#38059 from Scotty B White · Rule change · TB 25-06 (2025-06 Fastrack)
fasterT4 Ford Mustang V6 05-14 weight drops from 3400 to 3300 lbs.
In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows: Final Drive: "3.45 or 3.31" "Weight: "3400 3300"
T4 SSC tire allowance
#38216 from Benjamin Bunk · Rule change · TB 25-06 (2025-06 Fastrack)
neutralT4 Scion FR-S and Subaru BRZ Solo Spec allow any 200TW 225/45/17 or 215/45/17 DOT tire.
In T4 Spec Lines, Scion FR-S Solo Spec Coupe (13-16), change Notes as follows: "Any 200TW 225/45/17 or 215/45/17 DOT tire permitted." In T4 Spec Lines, Subaru BRZ Solo® Spec Coupe (13-16), change Notes as follows: "Any 200TW 225/45/17 or 215/45/17 DOT tire permitted."
Applies to Scion FR-S on this page: Tony Kiratsous
neutralT4 now permits B-Spec and C-Spec cars to compete in the class.
In GCR, Section 9.1.9.2, Touring car eligibility, change as follows: "Touring car eligibility: Cars are eligible for the class they are listed with a specification line and with the specific allowances permitted. In addition T2-T4 cars may race one class up in touring classes above their specification line class as long as they are a legal T2-T4 car and conform to their specification line allowances as classified. Cars conforming to B-Spec or C-Spec rules are permitted to compete in Touring 4."
T4 Incorrect Touring Heading
#38451 from Terry Hanushek · Rule change · TB 25-08 (2025-08 Fastrack)
neutralT2, T3, T4 Spec Lines table header changed from T2 to ET.
In T2-T4 Spec Lines, change Table Header as follows: "T2 ET"
STL Lotus Weight Reduction
#38772 from Club Racing Board · Rule change · TB 25-08 (2025-08 Fastrack)
fasterSTL/STU Lotus weight reduced: Evora GT4 to 2700 lbs, Elise Cup R to 2250 lbs, Elise/Exige SC to 2450-2550 lbs.
In 9.1.2. GT2/ST Spec Lines, Lotus Evora GT4, change Weight as follows: "2750 2700" In STU Table B: Alternate Vehicle and Engine Allowances, change Weight as follows: Lotus Elise Cup R: "2300 2250" Lotus Elise SC/ Lotus Exige SC: "2300 2550 2500 2450"
SRF3 SRF Rule Updates
#38853 from Robey Clark · Rule change · TB 25-09 (2025-09 Fastrack)
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
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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"
SRF3 Add HD Oil Cooler
#38979 from Robey Clark · Rule change · TB 25-10 (2025-10 Fastrack)
neutralSRF3 adds HD Oil Cooler P/N G1148500 as alternative to standard cooler P/N G480503.
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."
unclearT4 Mini Cooper S R53 02-06 gear ratios changed to 12.79, 7.79, 5.65, 4.62, 3.83, 3.13 or 11.42, 7.18, 5.39, 4.40, 3.65, 2.96.
In T4 Spec Lines, Mini Cooper S R53 (02-06), change Gear Ratios as follows: "12.79, 7.79, 5.65, 4.62, 3.83, 3.13 or overall- 11.42, 7.18, 5.39, 4.40, 3.65, 2.96"
T4 Reinstatement of the 2005-2010 Cobalt into T4
#38987 from Tim Little · Rule change · TB 25-11 (2025-11 Fastrack)
neutralChevrolet Cobalt SS Sport Coupe 06-10 reinstated to T4 with 2384cc engine, 2628 restrictor, 2700 lbs minimum weight.
In T4 Spec Lines, classify Chevrolet Cobalt SS, Sport Coupe (06-10) as follows:
A specification table follows in the original; it is not shown here.
T4 Request to Classify Mercedes C230K
#39080 from Patrick Morgan · Rule change · TB 25-11 (2025-11 Fastrack)
neutralMercedes C230 Kompressor 2002-2005 classified in T4 at 3240 lbs with 17-inch wheels and 300/290 mm brakes.
In T4 Spec Lines, classify Mercedes C230 Kompressor (2002-2005) as follows:
A specification table follows in the original; it is not shown here.
T4 ND Gearset Request for T4
#39166 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)
neutralT3 and T4 Mazda MX-5 Miata models add approved gear kit PT#-0000-02-6100 to notes.
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), add to Notes the following: "Gear kit Kit PT#- 0000-02-6100." In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), add to Notes the following: "Gear kit Kit PT#- 0000-02-6100." In T3 Spec Lines, Mazda MX-5 Miata (16-18), add to Notes the following: "Gear kit Kit PT#- 0000-02-6100." In T3 Spec Lines, Mazda MX-5 Global Cup Miata (2016-2021) ND1, ND, add to Notes the following: "Gear kit Kit PT#- 0000-02-6100."
Applies to Mazda Miata on this page: Oscar Jackson, Kristina Etherington, Kayla Etherington
T4 E&O wheel size on ND
#39168 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)
unclearT4 Mazda MX-5 Miata/Club 16-18 wheel size changed to 17 x 7.5 inches.
In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Wheel Size (in.) as follows: "17 x 7.5"
Applies to Mazda Miata on this page: Oscar Jackson, Kristina Etherington, Kayla Etherington
T4 ND Spec Lines Wrong PT#'s
#39170 from Josh Smith · Rule change · TB 25-11 (2025-11 Fastrack)
neutralT4 Mazda MX-5 Miata/Club/RF (19-24) and (16-18) remove discontinued hardtop part #0000-07-5901; T3 MX-5 Miata (16-18) and Global Cup ND (16-21) same.
In T4 Spec Lines, Mazda MX5 Miata/Club/ RF (19-24), change Notes as follows: "Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. The following item(s) must remain stock: transmission differential unless specified below. Retractable hardtop option permitted but must be disabled from moving action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars allowed. 3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-02, 0000-02-5804-01). Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front springs #0000-04-9700-08, springs up to 500lb front and 300lb rear allowed. Mazda tower brace 0000-04-5626 allowed. Mazda header
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0000-06-5410 allowed." In T4 Spec Lines, Mazda MX-5 Miata/Club (16-18), change Notes as follows: "Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. Retractable hardtop option permitted but must be disabled from moving action and positively fastened. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop part #0000-07-5902-ND and part #0000-07-5901 (discontinued DG Motorsports). 29mm (f) 16mm (r) sway bars allowed. Up to 500lb front and 300lb rear springs allowed. Mazda Motorsports Header part #0000-06-5410 allowed. Mazda tower brace 0000-04-5626 allowed. 3rd and 4th gear may be replaced with the following parts- (0000-02-5803-02, 0000-02-5803-01, 0000-02-5804-02, 0000-02-5." In T3 Spec Lines, Mazda MX-5 Miata (16-18), change Notes as follows: "Factory bolt-in roll bar/ cross member may be removed to facilitate roll cage installation. Header permitted. Cold air intake permitted. Front strut brace permitted. Front and rear sway bars permitted up to 35mm, Springs 800 front and 800 Rear max permitted. Any OEM or aftermarket hardtop permitted that retains the OEM roof silhouette including Mazda hardtop part #0000-07-5902- ND and part #0000-07-5901 (discontinued DG Motorsports top). If a hardtop is used, latches shall be replaced with positive fasteners. Retractable hardtop option permitted but must be disabled from moving action and positively fastened. In T3 Spec Lines, Mazda MX-5 Global Cup Miata (2016-2021) ND1, ND, change Notes as follows: "Shoulder harness installation must conform to FIA mounting specifications that are approved for this vehicle per section 6.2 FIA article 253, safety equipment. Must meet all ND2 MX-5 Global Cup rules. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop Mazda hardtop part #0000-07-5902-ND and #0000-07-5902-ND part #0000- 07-5901 (discontinued DG Motorsports). If a hardtop is used, latches shall be replaced with positive fasteners. OBD2 requirement does not apply. Ballast box may be removed. ND2s with sequential gearbox allowed +100 lbs.
Applies to Mazda Miata on this page: Oscar Jackson, Kristina Etherington, Kayla Etherington
T4 Touring 4 Post-Runoffs BOP Adjustments and Changes
In T4 Spec Lines, Acura RSX/ RSX Type-S (02-06), change Restrictor as follows: "55mm FPR" In T4 Spec Lines, Acura TSX (2004-2008), change Restrictor as follows: "47mm FPR 52mm FPR" In T4 Spec Lines, BMW Z4 2.5L (03-05) , change Weight as follows: "3050 2950" In T4 Spec, BMW 320i (14-15), remove this spec line in its entirety. In T4 Spec Lines, BMW 323 (98-00), change as follows:
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Tire size: "225 245" Weight: "3250 3150" In T4 Spec Lines, Ford Mustang V6 (05-14), change as follows: Restrictor: "50mm 43mm" Weight: "3300 3400" In T4 Spec Lines, Honda Civic Si (06-11), change Restrictor as follows: "55mm" In T4 Spec Lines, Honda Civic Si (12-15), change as follows: Restrictor: "47mm 52mm Notes: "Transmission and Differential must be stock." In T4 Spec Lines, Mazda MX-5 / Club Model (06-15), change as follows: Weight: "2550 2500" Notes: "Factory bolt-in roll bar/cross member may be removed to facilitate roll cage installation. MSR option permitted. Suspension package permitted with a 100 lbs. weight increase that includes the following parts: front spring mount PT#-0000- 04-5259, front springs #0000-04-9700-08, rear spring mount PT#-0000-04-5258, rear springs #0000- 04-9400-07, helper springs #0000-04-HLPR-EB (optional), Swaybar kit – PT#-0000-04-5306-EB that includes (front sway bar kit PT#0000-04-5306-FT, rear sway bar kit PT#-0000-04-5306-RR), offset front camber bushing PT#- 0000-04-5407-NC. Mazda Motorsports cold air intake part #0000-06-5150-KT allowed. Mazda Motorsport RX8 rear Hub Conversion kit part number 0000-04-5811-KT allowed, RX8 front hubs PT# F189-33-04X allowed. Allow Mazda header part numbers 0000-06-5407 or 0000-06-5407-NC. Any OEM or aftermarket hardtop is permitted that retains the OEM roof silhouette, including Mazda hardtop and part #0000-07-5901-CC. Aftermarket power steering reservoir is allowed. Mazda Transmission kit part # 0000-02-5700. Mazda Motorsports LSD #32655 permitted without penalty. Any other non-OEM limited slip differential allowed with +50 lbs. weight penalty. Front spoiler permitted (NF51-V4-900F). Transmission kit # 0000-02-57 In T4 Spec Lines, Pontiac Solstice / Saturn Sky (06-09), change as follows: Weight: "2800 2700" Brakes: "(F) 296 315 Vented Disc max (R) 278 Solid Disc" Notes: "GM calipers #22720705, and #25900764 permitted" In T4 Spec Lines, Scion FRS/10 series (13-16), change Weight as follows: "2925 2875" In T4 Spec Lines, Subaru BRZ/ BRZ Limited (13-16), change Weight as follows: "2925 2875" In T4 Spec Lines, Subaru BRZ (17-21), change Weight as follows: "3000 2950" In T4 Spec Lines, Toyota 86, GT (17-21), change Weight as follows: "3000 2950" SCCA Runoffs
Applies to Mazda Miata on this page: Oscar Jackson
neutralT2, T3, T4 cars may relocate under-dash electronics and fuse boxes for access after roll cage installation.
In GCR, Section 9.1.9.2.D.9.d, add the following: "8. Under-dash electronics including computers, modules and fuse boxes may be relocated so they can be easily accessed after roll cage installation."
T4 Clarify T4 Brake Rotor Allowance
#39503 from David Mead · Rule change · TB 26-01 (2026-01 Fastrack)
neutralT4 Performance now permits 1-piece alternative rotors matching spec line sizes; alternate brake kits allowed same.
In GCR, Section 9.1.9.2.D.6.a.6., change as follows: "In T2-Performance alternative rotors, including 2 piece rotors are permitted. Rotors must be within 5% of OE diameter or a maximum diameter of 360mm. In T3- Performance alternative rotors, including 2 piece rotors are permitted with a maximum diameter of 360mm. T4- Performance alternative 1-piece rotors are permitted but rotors must meet the sizes listed in the spec line. Spec lines showing alternate brake kits are also permitted to use 1-piece performance alternative rotors of the same size."
STL Weight adjustment for STL
#39579 from Super Touring Committee · Rule change · TB 26-01 (2026-01 Fastrack)
slowerSTL minimum weights increase across all classes, 1300 cc gains 195 lbs to 1950, up to 1850 cc at 2500.
In GCR, Section 9.1.4.2.H.1. change Minimum Weight on chart as follows:
A specification table follows in the original; it is not shown here.
T4 T4 and T3 Feedback
#39230 from Tim Myers · Rule change · TB 26-02 (2026-02 Fastrack)
neutralFord Mustang V6 (05-14) removed from T4 Spec Lines.
In T4 Spec Lines, remove Ford Mustang V6 (05-14) in its entirety.
T4 T4 Mustang 4.0
#39489 from Scotty B White · Rule change · TB 26-02 (2026-02 Fastrack)
fasterT4 Mustang 4.0 V6 tire size increases from 245 to 255.
In T4 Spec Lines, Ford Mustang V6 (05-10), change as follows: Tire: "245 255" Notes: "ABS (option code 552) allowed. FR3 Handling Pack #M-2007-FR3V6 allowed (kit does not need to be run in its entirety). The kit includes: Dampers M-18000-A, Lowering Springs M-5300-N, Sway Bars M- 5490-C, Strut Tower Brace M-20201-F. Ford Positraction LSD part #M-4204-C75 is allowed. Any springs max F: 500 and R: 400 permitted. Any sway bar up to F: 35mm and R: 28mm permitted. Aftermarket Shocks conforming to T4 rules allowed. Panhard bar, part # BAR-M-4264-A permitted, or any pan hard bar permitted must be set at same length as a stock bar, center mounting hole to center mounting hole +/- 0.25 inch. An alternative steel drive shaft is permitted; this drive shaft is otherwise unrestricted, but no modifications to other components
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are permitted to facilitate its installation. An Aluminum driveshaft is allowed. Any LSD permitted. Ford brake kit M-2300-D allowed. Aftermarket header allowed. GT 8.8 rear axle assembly allowed. 3.45 or 3.55 Alternate final drive ratio allowed. 7.5 rear axle assembly with 3.45:1 final drive allowed. Cold Air Intake allowed. Koni part numbers 8741-1494SPORT (front) and 8241-1240SPORT (rear). Spec clutch #SF661 and flywheel #SF66A permitted. 14” Brembo Brake Kit#M-2300-S permitted."
T4 Allow Alt Bushing Material in Toe Links
#39607 from David Mead · Rule change · TB 26-02 (2026-02 Fastrack)
fasterT2-T4 adjustable toe links now allow performance alternative bushings and spherical bearings, previously prohibited except in specified examples.
In GCR, Section 9.1.9.D.5.a.1., change as follows: "T2-T4: A maximum of 3.5 degrees of negative camber is allowed on front and rear suspensions. Spec line part(s) may not be modified to increase caster and camber. Strut suspensions may adjust camber and caster by the use of eccentric bushings, eccentric bolts (crash bolts) at the strut-to-spindle, and/or by use of slotted adjustment plates at the top of the strut mounting plate. If upper strut slotted adjustment plates are used, they shall be located on existing chassis structure, utilizing the unmodified manufacturer’s original bolt holes and may not serve as reinforcement for that structure. Slotted adjustment plates (strut camber plates) may incorporate a single spherical bearing (spherical bushing) and a ball thrust bearing per strut tower. On other forms of suspension, camber and caster adjustment may be achieved by the use of shims and/or eccentric
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bushings. Adjustable toe links with spherical bearings are permitted and may serve no purpose other than adjusting toe angle. Adjustable toe links are permitted. They are allowed to have performance alternative bushings and spherical bearings. They may serve no purpose other than adjusting toe angle. Spherical bearings/bushings are not permitted in T2-T4 except for the specific examples listed in the class rules or vehicle spec line."
What the rules allowed changed as listed; this does not say what any particular car ran.