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 session is left out because the timing does not look like full laps: Cal Club 2023 Qualifying #2.
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
Swift Db6
FF
2
1:49.259Edward Erlandson
1:55.247Johnnie Crean
1:54.993Johnnie Crean
124.5Johnnie Crean
31.358Johnnie Crean
32.841Johnnie Crean
47.766Edward Erlandson
SWIFT DB-6 Honda
FF
1
1:49.259Edward Erlandson
47.766Edward Erlandson
Swift Db6
FF
1
1:54.993Johnnie Crean
1:55.247Johnnie Crean
1:54.993Johnnie Crean
124.5Johnnie Crean
31.358Johnnie Crean
32.841Johnnie Crean
50.291Johnnie Crean
Piper DL7-Honda
FF
1
1:51.118Eric Poulsen
1:52.044Eric Poulsen
1:51.118Eric Poulsen
114.7Eric Poulsen
30.276Eric Poulsen
31.650Eric Poulsen
48.818Eric Poulsen
Mazda Miata
EP/T4
3
1:52.034Joe Carr
1:59.603Joe Carr
1:59.157Joe Carr
131.6Joe Carr
31.719Joe Carr
32.405Joe Carr
49.966Joe Carr
Mazda MX-5
EP/T4
3
1:53.088Glen McCready
1:53.088Glen McCready
1:53.487Glen McCready
125.6Glen McCready
30.761Glen McCready
32.765Glen McCready
49.458Glen McCready
SWIFT DB-
FF
1
1:53.098Edward Erlandson
1:53.098Edward Erlandson
1:54.741Edward Erlandson
133.7Edward Erlandson
30.951Edward Erlandson
32.299Edward Erlandson
49.791Edward Erlandson
Mazda RX-7
EP
2
1:56.468Kurt Frietzsche
1:56.468Kurt Frietzsche
1:56.573Kurt Frietzsche
120.7Kurt Frietzsche
31.324Kurt Frietzsche
33.891Brandon Droese
50.204Kurt Frietzsche
BMW E30
EP
1
2:00.712Sean Lovett
2:00.712Sean Lovett
2:01.864Sean Lovett
127.6Sean Lovett
32.761Sean Lovett
34.806Sean Lovett
53.058Sean Lovett
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
EP/T4
2
2:01.940William Robinson
2:01.940William Robinson
2:02.887William Robinson
130.6William Robinson
32.969William Robinson
35.257William Robinson
53.408William Robinson
Mazda RX-8
T4
1
2:05.858Steven Kiratsous
2:06.604Steven Kiratsous
2:05.858Steven Kiratsous
105.7Steven Kiratsous
33.416Steven Kiratsous
35.585Steven Kiratsous
55.885Steven Kiratsous
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
FF Add Fast Forward Part Numbers for Honda Fit Engine
#33752 from Formula/Sports Racing Committee · Rule change · TB 23-03 (2023-03 Fastrack)
neutralFF Honda Fit engine adds Fast Forward part number alternatives for intake, exhaust, oil system, and scavenge pump components.
In FC/FF, GCR section 9.1.1.B.14.a.6, change as follows: "For all Honda part numbers in these specifications, superc seding part numbers are considered equivalent. In FC/FF, GCR section 9.1.1.B.14.f.5, change as follows: "Cylinder head breather restrictor must be used as supplied by HPD or Fast Forward, unmodified.: HPD PN: 15262-F21S-A200; Fast Forward PN: FF200-503." In FC/FF, GCR section 9.1.1.B.14.k.2, change as follows: "The upper manifold, air box and throttle body assembly must be used as delivered from Honda, HPD, or Fast Forward as noted below."
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In FC/FF, GCR section 9.1.1.B.14.k.2, insert as follows: "a. Intake manifold: HPD PN: 17210-F21S-A210; Fast Forward PN: FF200-201. b. Throttle body: Honda Fit: PN: 16400ZZ5024; HPD PN: 16400ZZ5024; Fast Forward PN: FF200-104. c. Throttle lever: HPD PN: 17330-F21S-A210; Fast Forward PN: FF200-101." In FC/FF, GCR section 9.1.1.B.14.k.3, change as follows: "All gaskets and sensors utilized on the inlet manifold from head to throttle body must be Honda Fit OEM, or HPD supplied or Fast Forward as noted below. a. Gasket In. manifold: HPD PN: 17105-RB0-004, Honda Fit OEM. b. Gasket, EGR chamber cover: HPD PN: 17146-RB0-004, Honda Fit OEM. c. Gasket In. port: HPD PN: 17115-RB0-007, Honda Fit OEM. d. Gasket, restrictor: HPD PN: 17399-F21S-A200, (2 required) HPD; Fast Forward PN: FF200-109. Two required." In FC/FF, GCR section 9.1.1.B.14.k.5, change as follows: "The Honda Fit engine is required to have an HPD supplied air inlet restrictor supplied by HPD or Fast Forward: HPD PN: 17344- F21S-A201; Fast Forward PN: FF200-110, with internal diameter of 30.5mm and thickness of 3.175mm (0.125 inches) correctly installed within the intake system." In FC/FF, GCR section 9.1.1.B.14.m.1, change as follows: "The exhaust manifold must be as supplied by HPD or Fast Forward:, HPD part # PN: 18150-F21S-A200 or # PN: 1818 50-F21S-B200; Fast Forward PN: FF500-001 or PN: FF500-002." In FC/FF, GCR section 9.1.1.B.14.n.1, change as follows: "The oil pan, baffle plate, and scavenge pump filter fittings must be as supplied by HP or Fast Forward as noted below. No modifications are permitted. a. Oil pan: HPD PN: 11200-F21S-A210 or PN: 11200-F21S-C240; Fast Forward PN: FF100-201A or PN: FF100-201B. b. Oil pan baffle plate: HPD PN: 11221-F21S-A210; Fast Forward PN: FF100-202. c. Oil scavenge pump filter fittings (2 required): HPD PN: 15180-F21S-A210; Fast Forward PN: FF100-204." In FC/FF, GCR section 9.1.1.B.14.n.3, change as follows: "The scavenge pump and internal scavenge pump parts must be as supplied from HPD or Fast Forward as noted below." In FC/FF, GCR section 9.1.1.B.14.n.3, change as follows: "b. Rotor outside diameter: HPD 44.400mm (1.748 inches):; Fast Forward 40.640mm (1.600 inches). c. Scavenge pump rotor set: HPD PN: 15450-F21S-A20; Fast Forward PN: FF100-110. d. Oil pump: HPD PN: 15100-F21S-A200; Fast Forward PN: FF100-100A. e. Scavenge pump cartridge: 15111-F21S-A21; Fast Forward PN: FF100-127. f. Scavenge pump port A: HPD PN: 15137-F21S-A20; Fast Forward PN: FF100-101. g. Scavenge pump port B: HPD PN: 15139-F21S-A20; Fast Forward PN: FF100-102. h. Scavenge pump shaft: HPD PN: 15510-F21S-A20; Fast Forward PN: FF100-103. i. Scavenge pump front cover: HPD PN: 15070-F21S-A21; Fast Forward PN: FF100-104."
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."
EP Investigate Parity of Z3
#33343 from Tim Schreyer · Rule change · TB 23-01 (2023-01 Fastrack)
slowerEP BMW Z3 2.5L intake restrictor reduced from 58mm to 56mm flat plate.
Effective 4/1/2023 In EP Spec Line BMW Z3 2.5L, change Notes as follows: "58 56mm Flat Plate Intake Restrictor is required with both stock or alternate throttle body."
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.
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."
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"
fasterEP Porsche 914-6 2.0L intake valves increase to 2.0 mm, exhaust valves corrected to 38.0 mm.
In EP Spec Lines, Porsche 914 - 6 2.0L, change Valves IN & EX mm/(in.) as follows: "(I) 41.9 2.0/(1.65) (E) 38.1 0/(1.50)"
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"
EP Correct Intake Valve Size on 1500cc Midget/Spitfire
#34419 from Production Committee · Rule change · TB 23-06 (2023-05 Fastrack)
neutralFP and HP Sprite, Midget, and Spitfire 1500 intake valve size corrected to 36.6/(1.44).
In FP Spec Lines, Austin-Healey Sprite Mk. I, II,III, IV MG Midget Mk I,II, III, IV & 1500, change Intake Valve Size as follows: "(I) 36.65.3/(1.44)" In FP Spec Lines, Triumph Spitfire Mk. IV & 1500, change Intake Valve Size as follows: "(I) 36.65.5/(1.440)" In HP Spec Lines, Triumph Spitfire 1500, change Intake Valve Size as follows: "(I) 36.65.5/(1.440)" In HP Spec Lines, Triumph Spitfire Mk. III & IV 1500, change Intake Valve Size as follows: "(I) 36.65.5/(1.440)"
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)
EP Hub Note Clean Up In EP TR8 Spec Line
#34649 from Jeff young · Rule change · TB 23-09 (2023-09 Fastrack)
neutralEP Triumph TR8 78-81 removes alternate front hub allowance note; stock hubs now required.
In the EP Spec Lines, Triumph TR8 (78-81), remove the following wording from Notes: "Alternate front hubs are allowed provided they are of the same external dimensions as stock and weigh no less than the stock hubs."
EP Triumph GT6 Adjustments
#34662 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)
unclearEP Triumph GT6 carburetors change from SU or Stromberg to 1.5" Auto-type.
In EP Spec Lines, Triumph GT6, change Carburetor. No. & Type as follows: "(2) 1.5” SU or Stromberg Auto-type carburetor(s)"
EP Triumph GT6 Adjustments: Brakes
#34663 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)
neutralEP Triumph GT6 brakes may now use TR-6 standard or alternate calipers and discs.
In EP Spec Lines, Triumph GT6, add the following to Brakes Alt.: mm/(in.): "(F) Calipers & discs from TR-6 (std. or alt)"
EP Porsche 944/924S Rule Change Request
#35002 from Adam Achepohl · Rule change · TB 23-12 (2023-12 Fastrack)
neutralEP Porsche 944/924S combines 2.5L and 2.7L variants with new weights: 2250–2415 lbs depending on engine and year.
In EP Spec Lines, delete the Porsche 944/924S 2.5L (2V) (83-88) spec line entirely, and create a new spec line for Porsche 944/924S 2.5L(2V) 2.7L(2V) (83-89) as follows:
A specification table follows in the original; it is not shown here.
EP Triumph GT6 Adjustments
#35054 from ANTHONY PARKER · Rule change · TB 23-12 (2023-12 Fastrack)
fasterEP Triumph GT6 minimum weight reduced to 1800 lbs.
In EP Spec Lines, Triumph GT6, change weight as follows: "1830 1800"
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
In EP spec line, Triumph GT6, make the following change in the Notes section: "Two (2) 1.75” auto-type carburetors @ 1970 40 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990 lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive. Three (3) Weber 40mm DCOE w/28mm venturi on individual runner manifold @ 2020 lb."
EP Honda S2000 throttle body
#35272 from Aaron Johnson · Rule change · TB 24-01 (2024-01 Fastrack)
fasterEP Honda S2000 fuel injected throttle body inside diameter increases from 62mm to 64mm.
In EP spec line, Honda S2000, make the following changes to its spec line: Fuel Injected Equipped Throttle Body Inside Diameter: "62 64" Notes: "Comp. Ratio limited to 12.0:1. Valve lift limited to .500”. An adaptor plate can be used to mount the 62mm throttle body from '00-05 to the '06-09 intake manifold. The adaptor plate can be no more than 1.25" thick, and its bore must not exceed the "Fuel Injected Equipped Throttle Body Inside Diameter" maximum spec of 64mm."
neutralFF Honda Fit gains Fast Forward FF800-100 oversize piston ring pack option.
In FF, GCR section 9.1.1.B.14.e.3.a, add the following: "The standard ring pack, PN 13011-RB1-004 (Riken) or 13011-RB1-006 (Nippon), or the oversize ring pack, PN 13021-RB7-Z01 (Riken), or 13021-RB7-Z02 (Nippon), or FF800-100 (Fast Forward), may be used."
EP Correction within Triumph TR8 Spec Line
#35315 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)
neutralEP Triumph TR8 dry sump allowance moved from carburetor line to notes section.
In EP spec line, Triumph TR8 (78-81), move the "Dry sump allowed" wording to the appropriate location as follows: Carburetor. No. & Type: “Zenith Stromberg carbs or fuel injection. Dry sump is allowed.” Notes: “Comp. Ratio limited to 12.0:1, Valve lift limited to .500”. Dry sump is allowed.”
EP Correction to EP 924S/944 Spec Line
#35317 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)
neutralEP Porsche 944/924S 2.5L and 2.7L weight minimums corrected: 2479cc to 2306/2363 lbs, 2681cc to 2358/2415 lbs.
In EP spec line, Porsche 944/924S 2.5L (2V) / 2.7L (2V) (83-89), change Weight as follows:
A specification table follows in the original; it is not shown here.
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."
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 MX-5 on this page: Oscar Jackson
Applies to Mazda Miata on this page: 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)
In HP Spec Lines, delete the following redundant spec lines in their entirety: Spec line #10 - VW Rabbit Cabriolet 1780 Spec line #3 - VW Scirocco 1588 Spec line #4 - VW Scirocco 1780 (8-valve) (83-88) Spec line #5 - VW Scirocco 1588
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."
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.
#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 MX-5 on this page: Oscar Jackson
Applies to Mazda Miata on this page: Kristina Etherington, Kayla Etherington
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."
EP Clean-up Multiple EP RX-8 Spec Lines In EP
#36156 from Production Committee · Rule change · TB 24-06 (2024-06 Fastrack)
neutralEP Mazda RX-8 (04-11) alternate spec line removed; one primary line remains.
Spec Lines, make the following changes to the two Mazda RX-8 spec lines. Remove spec line entirely: Mazda RX-8 (04-11) Remove the wording "alternate": Mazda RX-8 (04-11)(alternate) Spec Mazda (SM/SMX) None.
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.
#36633 from Matt Boian · Rule change · TB 24-10 (2024-10 Fastrack)
neutralFF VTEC activation valve must function; EGR blanking plate rule clarified with Fast Forward part numbers.
In FF, GCR section 9.1.1.B.14.r.1, change as follows: "All emission control devices must be removed and blocked off by the blanking plate provided by HPD or Fast Forward as noted below, except for the VTEC activation valve. The VTEC activation valve must be retained; and it must be functioning. No modifications are permitted. a. EGR Plate: Fast Forward PN: FF200-301. b. EGR Port Cover: Fast Forward PN: FF200-302."
fasterHP Sprite and Midget 1275cc and 1098cc Level 2 compression ratio raised to 12.0:1.
In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1275cc, change Notes as follows: "(Effective 11/1/2024) Compression ratio limited to 11 12.0:1" In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1098cc, change Notes as follows: "(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"
FF Change FF/FC Weight with Sequential Gearbox
#36651 from Robert Wright · Rule change · TB 24-11 (2024-11 Fastrack)
fasterFF and FC cars with sequential gearbox must add 10 lbs. to minimum weight, down from 25 lbs.
In FF, GCR section 9.1.1.B.20.A.3, change as follows: "Cars running with a sequentially shifted gear box shall must add 25 10 lbs. to minimum weight." In FC, GCR section 9.1.1.B.20.B.4, change as follows: "Cars running with a sequentially shifted gear box shall must add 25 10 lbs. to minimum weight."
EP NA Miata Track Width Correction
#36902 from Production Committee · Rule change · TB 24-11 (2024-11 Fastrack)
neutralEP Mazda Miata front and rear track widths increased to 1516/1534 mm (59.7/60.4 in.) across all generations.
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."
FF Alternative Oversize Honda Fit Pistons
#37064 from Formula/Sports Racing Committee · Rule change · TB 24-11 (2024-11 Fastrack)
neutralFF Honda Fit allows Fast Forward 0.25mm oversize pistons PN FF800-110 as alternative; piston diameter spec clarified to 2.8835 inches.
In FF, GCR section 9.1.1.B.14.e.1, change as follows: "Honda Fit OEM standard size pistons, PN: 13010-RB1-000, or Honda Fit OEM 0.25mm oversize pistons, PN: 13020-RB7-Z00, or Fast Forward 0.25mm oversize pistons, PN: FF800-110, may be used." In GCR section 9.1.1.B.14.e.2, change as follows: "a. Maximum standard piston diameter, measured at a point 16mm from the bottom of the skirt: 73.240mm (2.8834 2.8835 inches). b. Centerline of wrist pin to crown maximum: 26.21mm (1.032 inches). c. Maximum overall height from skirt to crown edge: 47.80mm (1.882 inches).
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d. Minimum weight: 198.0 grams (6.984 ounces). e. Minimum weight of piston pin: 66 grams (2.25 ounces). f. Combined minimum weight of piston, piston pin and connecting rod: 543.5 grams (18.85 ounces). g. Combined minimum weight of piston, wrist pin, and circlips: 267 grams (9.418 ounces). h. Centerline of wrist pin to crown edge: 26.289mm (1.035 inches). i. Ring groove widths: Top ring groove: 1.003mm (0.0395 inches). Middle ring groove: 1.016mm (0.0400 inches). Oil ring groove: 1.981mm (0.0780 inches). j. Ring groove distance from wrist pin center to bottom of groove: Top ring groove: 19.63mm (0.7730 inches). Middle ring groove: 15.29mm (0.6020 inches). Oil ring groove: 10.91mm (0.4295 inches)."
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."
neutralMazda 3 (19-24) newly classified in T4 at 2850 lbs with 17×8 wheels and 245 tires.
In T4 Spec Lines, classify Mazda 3 (19-24), as follows:
A specification table follows in the original; it is not shown here.
EP Triumph GT6 Adjustments
#37112 from Anthony Parker · Rule change · TB 24-12 (2024-12 Fastrack)
slowerEP Triumph GT6 switches to three Weber 40 DCOE carbs with 28mm chokes, weight rises 50 lbs to 1990.
In EP Spec Lines, make the following changes in the "Triumph GT6" spec line: Carburetor No. & Type: (2): "1.5” 1.75" Auto-type carburetor(s)" Notes: "Two (2) 1.75” auto-type carburetors @ 1940 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990 lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive."
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."
#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
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 MX-5 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 MX-5 on this page: Oscar Jackson
Applies to Mazda Miata on this page: 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.
In EP Spec Lines, add to Notes as follows: BMW Z3 2.5LL "(Effective 2/21/2025) 52mm Flat Plate Intake Restrictor is required." BMW Z3 2.8L (97-00): "(Effective 2/21/2025) 55mm Flat Plate Intake Restrictor is required." BMW 328i/is E36 (96-99): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required." BMW 328i/ci E46 (01-06): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required." BMW 325i/is E46 (01-06): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required." BMW 325i/is E-36 (92-95): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required." BMW 325is M-Technic (1994): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
Cal Club 2025 → Cal Club 2026 2025-02-22 to 2026-02-21
EP Request Competition Adjustment to BMW Z3 2.5L
#37120 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)
slowerEP BMW Z3 and 3-series models get smaller intake restrictors: Z3 2.5L to 52mm, Z3 2.8L to 55mm, 328i to 58mm, 325i to 56mm.
In EP Spec Lines, change Notes as follows: BMW Z3 2.5LL "(Effective 3/1/2025) 56mm 52mm Flat Plate Intake Restrictor is required." BMW Z3 2.8L (97-00): "(Effective 3/1/2025) 59mm 55mm Flat Plate Intake Restrictor is required." BMW 328i/is E36 (96-99): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required." BMW 328i/ci E46 (01-06): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required." BMW 325i/is E46 (01-06): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required." BMW 325i/is E-36 (92-95): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required." BMW 325is M-Technic (1994): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
EP Interpretation of Production Rules on Mirrors
#37235 from Lawrence Slivinski · Rule change · TB 25-03 (2025-03 Fastrack)
neutralEP, FP, HP: interior or exterior mirrors meeting rule 9.3.36 now permitted.
In GCR, add new rule as Section 9.1.5.E.10.f: "Any interior or exterior mirror(s) that meets rule 9.3.36 may be used."
EP Weight Reduction for Honda S2000
#37466 from Michael Unger · Rule change · TB 25-03 (2025-03 Fastrack)
fasterEP Honda S2000 1997cc base loses 75 lbs to 2375; 2157cc base loses 60 lbs to 2450.
In EP, Spec Lines make the following weight changes:
A specification table follows in the original; it is not shown here.
EP Mazda 1999 Miata 1.8L
#37488 from Joe Carr · Rule change · TB 25-03 (2025-03 Fastrack)
fasterEP Mazda MX-5/Miata 99-05 minimum weight drops to 2100 lbs, 2153 lbs with power adder, 2205 lbs with two adders.
In EP Spec Lines, make the following weight change: Mazda MX-5 /Miata (99-05): "2150 2100 *2204 2153 **2258 2205"
FF Formula F Proposal to Invite Older Cars Via a Tire Rule Change
#37802 from Anthony Stefanelli · Rule change · TB 25-03 (2025-03 Fastrack)
fasterFF allows older cars with rocker arm or outboard suspension to use bias ply slicks or VFF tires instead of radials.
In FF, GCR section 9.1.1.B.10.e, change as follows: "Formula F shall be limited to the following tires (front tires may not be used as rears): Dries: Front - Hoosier R60A Radial 43322 or F1600 Radial 43321 185/60R13 Rear - Hoosier R60A Radial 43327 or F1600 Radial 43326 205/60R13 Wets: Front - Hoosier Wet or W3 Radial 44421 185/60R13 Rear - Hoosier Wet or W3 Radial 44426 205/60R13
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Alternatively, Formula F cars with rocker arm suspension (e.g., Swift DB1, 1987-90 Reynard) and/or outboard suspension on at least one chassis end may use the following tires: Dries: Front - Hoosier H43130 R60A 20.0 x 6.0-13 or H43164 R60A 20.5 x 7.0-13 bias ply slick Rear – Hoosier H43307 R60A 22.5 x 7.2-13 bias ply slick Wets: Radial wets listed above or Front - Hoosier 44165 135/545-13 VFF Rear - Hoosier 44170 165/580-13 VFF Front tires may not be used as rears, and tires may not be mixed, i.e., radial tires may not be mixed with bias ply slick tires, bias ply slick tires may not be mixed with VFF tires, and radial tires may not be mixed with VFF tires."
EP Request for Classification of Chevrolet Spark
#37755 from Kristian Smith · Rule change · TB 25-04 (2025-04 Fastrack)
neutralChevrolet Spark 16-22 classified HP Pre at 1850 lbs minimum weight, fuel injected, 1399 cc.
In HP Spec Lines, classify the Chevrolet Spark (16-22):
A specification table follows in the original; it is not shown here.
EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS
fasterHP Ford Festiva 88-93 minimum weight drops to 1600 lbs, variants to 1640 and 1680 lbs; compression ratio raised to 11.0:1.
In HP Spec Lines "Ford Festiva (88-93)" change as follows: Weight: "1700 1600 *1743 1640 **1785 1680" Notes: "Compression ratio limited to 10.5 11.0:1. Valve lift limited to .450”."
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.”
FF Page 228, FF tire rule 9.1.1.10.e
#38251 from Anthony Stefanelli · Rule change · TB 25-05 (2025-05 Fastrack)
neutralFF adds rocker arm and outboard suspension cars optional bias ply and VFF tires; removes front-as-rear rule, adds mixing restrictions.
In FF, GCR section 9.1.1.B.10.e, change as follows: "Formula F shall be limited to the following tires (front tires may not be used as rears): Dries: Front - Hoosier R60A Radial 43322 or F1600 Radial 43321 185/60R13 Rear - Hoosier R60A Radial 43327 or F1600 Radial 43326 205/60R13 Wets: Front - Hoosier Wet or W3 Radial 44421 185/60R13 Rear - Hoosier Wet or W3 Radial 44426 205/60R13
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Alternatively, Formula F cars with rocker arm suspension (e.g., Swift DB1, 1987-90 Reynard) and/or outboard suspension on at least one chassis end may use the following tires: Dries: Front - Hoosier H43130 R60A 20.0 x 6.0-13 or H43164 R60A 20.5 x 7.0-13 bias ply slick or Hoosier 44165 135/545-13 VFF Rear – Hoosier H43307 R60A 22.5 x 7.2-13 bias ply slick or Hoosier 44170 165/580-13 VFF Wets: Radial wets or VFF tires listed above or Front - Hoosier 44165 135/545-13 VFF Rear - Hoosier 44170 165/580-13 VFF Front tires may not be used as rears, and tires may not be mixed, i.e., radial tires may not be mixed with bias ply slick tires, bias ply slick tires may not be mixed with VFF tires, and radial tires may not be mixed with VFF tires."
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
EP Base Weight Adjustment for H-Production X1/9 Spec Lines
#38255 from Matthew Brannon · Rule change · TB 25-06 (2025-06 Fastrack)
fasterHP Fiat X-1/9 base weights reduced 50–53 lbs across 1300 and 1500 spec lines.
In HP Spec Lines, change Weight as follows: Fiat X-1/9 & Bertone1500: “1790 1740 *1835 1784 **1880 1827” Fiat X-1/9 1300: “1650 1600 *1691 1640 **1733 1680” Fiat X-1/9 1300: “2060 2010” Fiat X-1/9 1500: “1950 1900”
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."
slowerEP BMW Z4 03-05 restricted to 52mm flat plate intake restrictor.
In EP Spec Lines, BMW Z4 (03-05), add to Notes the following: “52mm Flat Plate Intake Restrictor.”
EP EP Fiat 124 Spider Competition Adjustment Request
#38498 from John Baucom · Rule change · TB 25-07 (2025-07 Fastrack)
fasterEP Fiat 124 Spider 1600 & 2000 weight drops 50 lbs to 2000; carburetors gain 2mm chokes to 36mm.
In EP Spec Lines, Fiat 124 Sport Spider 1600 & 124 Spider 2000, change as follows: Weight: "2050 2000" Carburetor No. & Type: "(2) Weber 40 IDF-40IFI, (2) Solex C40P116, 34 36mm choke(s) req’d, (2) Weber 45DCOE w/ 34 36 mm choke(s) on I.R. manifold or fuel injection."
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"
EP HP Plymouth Arrow spec omission
#38995 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
neutralHP Plymouth Arrow transmission max speeds clarified to 4 or 5.
In HP Spec Lines, Plymouth Arrow (76-80), add the following wording to Trans. Speeds(max): "4 or 5"
EP Add Wheel Diameter to Appendix G
#39008 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
neutralEP, FP, HP wheel diameter added to Appendix G as absolute maximum specification.
In Appendix G.2.3, change as follows: "Rim width and diameter are is absolute maximums."
EP Add TB ID tolerance to general Prod rules
#39009 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
neutralEP, FP, HP throttle body inside dimensions must remain stock with +/-.25mm tolerance; butterfly dimensions stock in FP, HP only.
In GCR, Section 9.1.5.E., change as follows: 9.1.5.E.1.b.4: "The inside dimensions of the throttle body casting/housing (as measured at the throttle butterfly) must remain stock (tolerance of +/-.25mm), but the throttle body can otherwise be ported and polished." 9.1.5.E.2.b.4: "The inside dimensions of the throttle body casting/housing and all dimensions of the throttle butterfly must remain stock (tolerance of +/-.25mm)."
EP Please Lower Weight of 280Z
#38871 from Matthew Miller · Rule change · TB 25-09 (2025-09 Fastrack)
fasterEP Nissan 280Z minimum weight reduced from 2560 to 2400 lbs.
In EP Spec Lines, Nissan 280Z, change Weight (lbs) as follows: "(Effective 11/1/2025) 2560 2400 *2624 2460 **2688 2520"
EP Miata Weight Adjustment Follow Up
#38949 from Don Tucker · Rule change · TB 25-10 (2025-10 Fastrack)
fasterEP Mazda MX-5 1.8L 90-97 weight reduced to 2125 lbs from 2150 lbs.
In EP Spec Lines, Mazda MX-5 / Miata 1.8L (90-97), Effective 11/1/2025 make the following weight change: "2150 2125"
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"
EP Weight Break for 1098 Midget / Sprite
#38970 from Kendall Jones · Rule change · TB 25-10 (2025-10 Fastrack)
In HP Spec Lines, Austin-Healey Sprite/Midget 1098cc, Effective 11/1/2025make the following weight change: "1630 1550"
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.
EP HP Volvo 142 spec omission
#38994 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
slowerHP Volvo 142/142E gains compression ratio limit 12.0:1 and valve lift limit .425".
In HP Spec Lines, Volvo 142/142E P-1800 Engine, Effective 11/1/2025 add the following wording to Notes: "Comp. Ratio limited to 12.0:1. Valve lift limited to .425”."
EP HP Mini DOHC 1.6
#38996 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
slowerHP Mini Cooper 07-15 valve lift reduced to .390", from .450".
In HP Spec Lines, Mini Cooper (07-13) (includes 09-15 convertible and 12-15 Coupe), Effective 11/1/2025 make the following changes to the Notes: "Compression ratio limited to 11.0:1, Valve lift limited to .450”.390"."
EP Add to Rabbit description
#39019 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
neutralFP and HP Volkswagen Rabbit descriptions updated: Convertible changed to Cabriolet in FP; Cabriolet added to three HP engine variants.
In FP Spec Lines, make the following spec line correction: "Volkswagen Rabbit (Includes Convertible Cabriolet)" In HP Spec Lines, make the following spec line correction: "Volkswagen Rabbit 1588 (Includes Cabriolet)" "Volkswagen Rabbit 1715 (Includes Cabriolet)" "Volkswagen Rabbit 1780 (Includes Cabriolet)"
EP Clean-up 9.1.5.E.7e
#39025 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
neutralEP, FP, HP: rear drum brake to disc conversion clarified; rotors solid, diameter limited to largest front rotor permitted.
In GCR, Section 9.1.5.E.7., change as follows: "e. Cars fitted with rear drum brakes, can convert to rear disc brakes without penalty. Note that the “Brakes Std.” and “Brakes Alt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes stock, from converting to rear disc brakes under this rule. When converting from rear drum brakes to rear disc brakes: 1. Rear brake rotors must be solid and can be no larger in diameter than the largest permitted front brake rotor, as defined on the vehicle’s spec line. 2. Rear calipers and mounting brackets are unrestricted but must be made of a ferrous or aluminum material. The standard and alternate brake listings on a vehicle’s specification line, does not prohibit a car that was fitted with rear drum brakes as stock
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from converting to rear disc brakes under this rule. 3. The “Brakes Std.” and “Brakes Alt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes as stock from converting to rear disc brakes under this rule."
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.
EP Add TB size to Ford Mustang (94-98) Spec Line
#39130 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
neutralEP Ford Mustang (94-98) fuel injected throttle body inside diameter specified at 60.
In EP Spec Lines, Ford Mustang (94-98) add the following to the Fuel Injected Equipped Throttle Body Inside Diameter column: "60"
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 MX-5 on this page: Oscar Jackson
Applies to Mazda Miata on this page: 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 MX-5 on this page: Oscar Jackson
Applies to Mazda Miata on this page: 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 MX-5 on this page: Oscar Jackson
Applies to Mazda Miata on this page: 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 MX-5 on this page: Oscar Jackson
EP TR2 Notes E&O
#39180 from Anthony Parker · Rule change · TB 25-12 (2025-12 Fastrack)
unclearEP Triumph TR2-TR4A allows 5-speed gearbox without overdrive; removes Weber carb and weight specification.
In EP Spec Lines, Triumph TR2, 3, 3A, 4, 4A, TR4, TR4A, IRS, make the following change to the Notes: "Front apron assembly may be made of alternate material. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990 lbs. Laycock overdrive, may use 5 speed gearbox without overdrive."
EP Balance of Power
#39187 from Jim Simaras · Rule change · TB 25-12 (2025-12 Fastrack)
slowerEP BMW Z3 2.5L restrictor reduced 52mm to 50mm, weight increased to 2550 lbs base; five other BMW models get smaller restrictors.
In EP Spec Lines, make the following changes to Restrictors: BMW Z3 2.5L: "52mm 50mm Flat Plate Intake Restrictor" BMW Z3 2.8L (97-00): "55mm 53mm Flat Plate Intake Restrictor" BMW 328i/is E36 (96-99): "58mm 55mm Flat Plate Intake Restrictor" BMW 328i/ci E46 (01-06): "58mm 55mm Flat Plate Intake Restrictor" BMW 325i/is (E46) (01-06): "56mm 53mm Flat Plate Intake Restrictor" BMW 325is M-Technic (1994): "56mm 53mm Flat Plate Intake Restrictor" BMW 325i/is E-36 (92-95): "56mm 53mm Flat Plate Intake Restrictor"
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In EP Spec Lines, BMW Z3 2.5L, change Weight as follows: "2500 2550 *2563 2614 **2625 2678"
In T4 Spec Lines, classify Dodge/Plymouth Neon ACR SOHC/DOHC (2/4 door) (95-99) as follows:
A specification table follows in the original; it is not shown here.
FF Formula F Alternative Tire Rule Proposed Clarifications
#39281 from Jay Messenger · Rule change · TB 26-01 (2026-01 Fastrack)
neutralFF clarifies alternative tire eligibility for cars homologated 1989 or earlier with rocker arm or outboard suspension on all four corners.
In FF, GCR section 9.1.1.B.10.e, change as follows: "Alternatively, Formula F cars with rocker arm suspension (e.g., 1987-90 Reynard, Swift DB1,) and/or outboard suspension on at least one chassis end homologated in 1989 or earlier with any combination of rocker arm or outboard suspension on all four corners (e.g., 1987 – 1990 Reynard, Swift DB1) may use the following alternative tires. Note: This rule is intended to allow older cars with the described suspension design to use the alternative tires. It is not to be exploited by modifying cars with push-rods or pull-rods to meet the above requirements or by modifying either end of older cars to push- or pull-rod suspension to be eligible to run the alternative tires. Cars that were homologated in 1989 or earlier with push- or pull-rod suspension on no more than two corners may seek approval to run the alternative tire by utilizing the compliance process outlined in GCR section 8.1.4."
EP Request to Update E30 BMW Throttle Body Diameter Verbiage
#39363 from Tim Schreyer · Rule change · TB 26-01 (2026-01 Fastrack)
neutralEP BMW 325i/is E30 throttle body specified as 60mm in fuel injection notes.
In EP Spec Line BMW 325i/is E30 (84-91), change Drivetrain Notes as follows: "Fuel Injection, TB: 60mm"
T4 Alternate Placement of Fuse Panel and Electronics Request
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."
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.