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BoP Lab / Buttonwillow Raceway Park

FF + GTX + FE2 at Buttonwillow Raceway Park

No mapCal Club 2024, Cal Club 2023

Track map: sectors and speed trap

Track map with timing sectors and speed trap
Shown for: Cal Club 2026 (practice, qualifying, race) · Cal Club 2025 (practice, qualifying, race)
Class · click a class to switch, + to compare alongside
Track configuration
Events

This track has been raced on 4 configurations (The Circuit, 2.57 mi; 19, 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.

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.

PosCarDriverClass#LapTheoreticalQualRace5-lap stintConsistencyTrapS1S2S3
1Formula Enterprise (2023)Blake PigeonFE21081:12.402 D-Q21:12.402 D-Q2
2SCCA Ent FE2 (2007)John YeatmanFE2221:13.988 D-Q21:13.988 D-Q2
3SCCA Ent FE2 (2010)Thomas W BurtFE2451:14.003 D-Q21:14.003 D-Q2
4SCCA Ent FE2Jon McClintock >115%FE2231:39.265 A-Q21:39.2651:39.265 A-Q21:40.253 A-R11:40.602 A-R1+1.377 A-R1152.6 A-Q227.464 A-Q228.773 A-Q243.028 A-Q2
5SCCA Ent FE2Paul Marino >115%FE2441:39.358 B-Q21:39.2091:39.358 B-Q21:39.712 B-R11:40.188 B-R1+0.849 B-R1156.6 A-Q127.234 B-Q228.582 B-R143.393 B-Q2
6SCCA Ent FE2Tom Hope >115%FE2181:39.452 B-Q21:39.3931:39.452 B-Q21:39.992 B-R11:40.186 B-R1+0.531 B-R1125.6 B-Q127.375 B-Q228.661 B-Q243.357 B-Q1
7SCCA Ent FE2Tom Burt >115%FE2451:40.774 B-Q11:40.5691:40.774 B-Q11:40.955 B-R11:41.516 B-R1+0.989 B-R1154.7 A-R127.836 B-R129.021 A-Q243.712 B-Q1
8SCCA Ent FE2Noah Hambayi >115%FE2641:40.848 B-Q21:40.6731:40.848 B-Q21:41.416 B-R21:41.703 B-R2+1.034 B-R2142.4 B-P27.646 B-R228.966 B-Q244.061 B-P
9SWIFT DB-6 HondaEdward Erlandson 2+ carsFF81:49.259 A-P47.766 A-P
10ChevroletBob BlizzardGTX91:49.569 B-P1:49.051124.2 B-P29.869 B-P31.704 B-P47.478 B-P
11Ford Mustang GT4Rob SchollGTX221:49.596 B-R21:48.8001:49.596 B-R21:50.003 B-R2+0.917 B-R2116.4 B-R230.070 B-R231.820 B-R146.910 B-R2
12Piper DL7-HondaEric PoulsenFF481:51.118 B-R11:50.7441:52.044 B-Q11:51.118 B-R11:51.583 B-R1+3.025 B-R1114.7 B-R130.276 B-R131.650 B-R148.818 B-R1
13SWIFT DB-Edward Erlandson 2+ carsFF541:53.098 A-Q11:53.0411:53.098 A-Q11:54.741 A-R21:56.774 A-R2+1.819 A-R2133.7 A-Q130.951 A-Q132.299 A-Q149.791 A-Q1
14Porsche 981 CaymanMoze CowperGTX1111:54.892 A-Q11:54.0661:54.892 A-Q11:55.330 A-R21:55.654 A-R2+0.622 A-R2146.0 A-R131.377 A-R132.983 A-R249.706 A-Q1
15Swift Db6Johnnie CreanFF351:54.993 A-R21:54.4901:55.247 A-Q21:54.993 A-R21:56.752 A-R2+1.519 A-R2124.5 A-R231.358 A-Q132.841 A-R250.291 A-R2
16Chevrolet CameroMichael ArnheiterGTX631:59.339 B-P1:56.800124.8 B-P32.354 B-P33.705 B-P50.741 B-P

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

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

CarClassDriversLapQualRaceTrapS1S2S3
Formula EnterpriseFE211:12.402Blake Pigeon1:12.402Blake Pigeon
SCCA Ent FE2FE271:13.988John Yeatman1:13.988John Yeatman1:39.712Paul Marino156.6Paul Marino27.234Paul Marino28.582Paul Marino43.028Jon McClintock
Swift Db6FF21:49.259Edward Erlandson1:55.247Johnnie Crean1:54.993Johnnie Crean124.5Johnnie Crean31.358Johnnie Crean32.841Johnnie Crean47.766Edward Erlandson
ChevroletGTX21:49.569Bob Blizzard124.8Michael Arnheiter29.869Bob Blizzard31.704Bob Blizzard47.478Bob Blizzard
Ford Mustang GT4GTX11:49.596Rob Scholl1:49.596Rob Scholl116.4Rob Scholl30.070Rob Scholl31.820Rob Scholl46.910Rob Scholl
Piper DL7-HondaFF11:51.118Eric Poulsen1:52.044Eric Poulsen1:51.118Eric Poulsen114.7Eric Poulsen30.276Eric Poulsen31.650Eric Poulsen48.818Eric Poulsen
SWIFT DB-FF11:53.098Edward Erlandson1:53.098Edward Erlandson1:54.741Edward Erlandson133.7Edward Erlandson30.951Edward Erlandson32.299Edward Erlandson49.791Edward Erlandson
Porsche 981 CaymanGTX11:54.892Moze Cowper1:54.892Moze Cowper1:55.330Moze Cowper146.0Moze Cowper31.377Moze Cowper32.983Moze Cowper49.706Moze Cowper

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)

Summary

wordingFF Honda Fit engine adds Fast Forward part number alternatives for intake, exhaust, oil system, and scavenge pump components.

As printed in Fastrack

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."

GTX Please classify Fields Cardinal V8

#33784 from James Rogersn · Rule change · TB 23-05 (2023-05 Fastrack)

Summary

cars addedFields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.

As printed in Fastrack

In GT Spec Lines, GT1 Cars - Fields Cardinal, classify Fields Cardinal V8 as follows:
GT1 Cars – Fields Cardinal
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Fields Cardinal V8 2023 2 Dr. RWD 92.0 Roll Cage MUST be modified to comply with

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GCR Section 9.4.
In GT Spec Lines, GT1Engines - classify Ford V8 as follows:
GT1 Engines - Ford
Engine
Family
Engine Type Bore x

A specification table follows in the original; it is not shown here.

GTX Request Ligier LMP3 Classification

#34043 from Alex Kirby · Rule change · TB 23-06 (2023-07 Fastrack)

Summary

cars addedGTX Ligier LMP3 3.7L NA classified at 2203 lbs with 22 mm restrictor.

As printed in Fastrack

In GTX Spec Lines, classify Ligier LMP3 as follows:
GTX - MISC
Make Model Engine Restrictor
(mm) Weight (lbs) Notes
Ligier LMP3 3.7L NA 2203

GTX Ligier JSP4 Request

#34173 from Bob Monette · Rule change · TB 23-06 (2023-07 Fastrack)

Summary

cars addedGTX Ligier JSP4 newly classified as GTX Misc with restrictor and weight specified.

As printed in Fastrack

In GTX Spec Lines, classify Ligier JSP4 as follows:
GTX - MISC
Make Model Engine Restrictor
(mm) Weight (lbs) Notes

GTX Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules

#34453 from David Gomberg · Rule change · TB 23-12 (2023-12 Fastrack)

Summary

wordingGTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL.

As printed in Fastrack

from the current (or before) Table of Contents (TOC), to what is shown in the after TOC.
GTL spec lines will now be contiguous with GT2 and 3 spec lines.
GTA category and spec lines will be moved and renumbered behind GTL. GTA Section will not change but page numbers will, (as
shown in Red italics).
9.1.2.F. GT-2, 3, LITE Category Specifications 314
GT2 Cars 327
GT2/ST 341
GT3 Cars 348

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GTL Cars 364
GTA Cars 377
P2 Engine Table B.1
2010 and older
Stock Kawasaki
38.5mm
minimum width 52 inches. AMAC-AM5:
minimum width 54 inches.
P2 Engine Table B.1
2008 and older
Stock Engine 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 37mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 39mm
Stock Engine
1050 lbs.

GTX KTM X Bow GTX

#34956 from Demetrio Bilbatua · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

cars addedGTX adds KTM X-Bow classification with restrictor and weight specifications effective 2024-01-01.

As printed in Fastrack

In GTX Spec Lines, classify KTM as follows:
GTX – KTM
Make Homologation Model Restrictor
(mm) Weight (lbs) Notes

FF Honda Fit Oversize Piston Rings

#35305 from Doug Learned · Rule change · TB 24-01 (2024-01 Fastrack)

Summary

wordingFF Honda Fit gains Fast Forward FF800-100 oversize piston ring pack option.

As printed in Fastrack

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."

GTX Rear Blade Spoiler Clarification

#35261 from Butch Kummer · Rule change · TB 24-02 (2024-01 Fastrack)

Summary

fasterGT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed.

As printed in Fastrack

In GCR Section 9.1.2.G (GTA Category Specifications), change as follows:
“9.1.2.G.III.I
The single-plane rear spoiler must be mounted at an angel angle from 50 to 75 degrees (perpendicular to the ground
being 90 degrees) and may not extend beyond the rear bumper when viewed from directly above the rear
bumper. Spoilers must be a minimum of .063 aluminum or Lexan and may vary in overall height to match the contours
of the bodywork. The rear spoiler dimensions shall not exceed 59.0 inches wide by 5.0 inches in height, (measured on
the material surface) , or 295.0 square inches total surface area. Braces to prevent spoiler deflection are allowed, but
may serve no other purpose.”

GTX GT Direct Injection allowance and rules

#35437 from Grand Touring Committee · Rule change · TB 24-02 (2024-01 Fastrack)

Summary

fasterGT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors.

As printed in Fastrack

In GCR, Section 9.1.2.F.7.5.E. change as follows:
“Direct Injection is not permitted only if it came OE and must be installed using only OE high pressure pump(s), hard and
soft hoses and injectors.”

GTX GT2/3 remove Direction Injection not allowed in Spec line notes

#35439 from Grand Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)

Summary

fasterGT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E.

As printed in Fastrack

In GT2/3 modify Spec Line notes as follows:
GT2:
Nissan: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
GT3:
Mazda: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
Mitsubishi 4G93: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E. ”
Nissan QR25DE/DD 1988cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
Nissan QE25DE/DD 2489cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”

Cal Club 2024 → Cal Club 2025 2024-02-23 to 2025-02-22

GTX Request for Spec Line 1010 Reconsideration

#35009 from Kristofer Olson · Rule change · TB 24-05 (2024-05 Fastrack)

Summary

slowerGT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR.

As printed in Fastrack

In GT2-ST Spec Lines, Acura NSX, change as follows:
Minimum Weight: "2700 3000"
Restrictor: "43 45mm TIR"

FF Update to FF EGR Blanking Plate Rule

#36633 from Matt Boian · Rule change · TB 24-10 (2024-10 Fastrack)

Summary

wordingFF VTEC activation valve must function; EGR blanking plate rule clarified with Fast Forward part numbers.

As printed in Fastrack

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."

FF Change FF/FC Weight with Sequential Gearbox

#36651 from Robert Wright · Rule change · TB 24-11 (2024-11 Fastrack)

Summary

fasterFF and FC cars with sequential gearbox must add 10 lbs. to minimum weight, down from 25 lbs.

As printed in Fastrack

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."

FF Alternative Oversize Honda Fit Pistons

#37064 from Formula/Sports Racing Committee · Rule change · TB 24-11 (2024-11 Fastrack)

Summary

wordingFF Honda Fit allows Fast Forward 0.25mm oversize pistons PN FF800-110 as alternative; piston diameter spec clarified to 2.8835 inches.

As printed in Fastrack

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)."

GTX Correct language regarding OEM Areo Devices

#37137 from Christopher Childs · Rule change · TB 25-01 (2025-01 Fastrack)

Summary

wordingTA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement.

As printed in Fastrack

In GCR, Section APPENDIX L. 2013 TA2 TECHNICAL REGULATIONS, B.2.c., change as follows:
"B. Aerodynamic Devices
2. Rear wing
c. The entire rear wing assembly, including the end plates and any Gurney flap, shall be mounted level
with, or below, the peak of the roof. OEM aerodynamic devices do not need to adhere to the height rule."

A specification table follows in the original; it is not shown here.

Cal Club 2025 → Cal Club 2026 2025-02-22 to 2026-02-21

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)

Summary

fasterFF allows older cars with rocker arm or outboard suspension to use bias ply slicks or VFF tires instead of radials.

As printed in Fastrack

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."

FE2 Driver Safety & Comfort

#37965 from Robey Clark · Rule change · TB 25-04 (2025-04 Fastrack)

Summary

wordingFE2 allows driver safety and comfort modifications for disabled drivers with SCCA approval, not transferable to other drivers.

As printed in Fastrack

In FE2, GCR section 9.1.1.G.2.E, add the following:
"g. 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."

GTX Request to Classify Porsche GT2 RS Clubsport

#37972 from Paul Fairchild · Rule change · TB 25-05 (2025-05 Fastrack)

Summary

cars addedGTX Porsche GT2 RS Clubsport classified with factory specifications required at all race events.

As printed in Fastrack

In GTX, Classify Porsche GT2 RS Clubsport, as follows:
GTX
Make Homologation Model Restrictor
(mm)
Weight
(lbs) Notes
Porsche GT2 RS Clubsport Must have factory specifications available at all race events

FF Page 228, FF tire rule 9.1.1.10.e

#38251 from Anthony Stefanelli · Rule change · TB 25-05 (2025-05 Fastrack)

Summary

tyres & wheelsFF adds rocker arm and outboard suspension cars optional bias ply and VFF tires; removes front-as-rear rule, adds mixing restrictions.

As printed in Fastrack

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."

GTX Ligier P3 LS Swap

#38164 from Bart Wolf · Rule change · TB 25-06 (2025-06 Fastrack)

Summary

unclearGTX Ligier LMP3 now allows any normally aspirated LS Chevrolet engine.

As printed in Fastrack

In GTX Spec Lines, GTX-MISC., Ligier, LMP3, 3.0L, Add to Notes the following:
"Allow any normally aspirated LS Chevrolet engine may be used."

FE2 FE & FE2 Bubble Tail

#38978 from Robey Clark · Rule change · TB 25-10 (2025-10 Fastrack)

Summary

wordingFE and FE2 Enterprises must use bubble tail P/N WM138014; FE2 allows only this configuration.

As printed in Fastrack

In FE, GCR section 9.1.1.G.2.F.k, change as follows:
"Enterprises bubble tail P/N: WM138014 is allowed for FE and is the only configuration for FE2."

FF Formula F Alternative Tire Rule Proposed Clarifications

#39281 from Jay Messenger · Rule change · TB 26-01 (2026-01 Fastrack)

Summary

wordingFF clarifies alternative tire eligibility for cars homologated 1989 or earlier with rocker arm or outboard suspension on all four corners.

As printed in Fastrack

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."

GTX Please Consider Adding a Spec Line to GTX Table 4 for the RCR T70

#39470 from Peter Jankovskis · Rule change · TB 26-01 (2026-01 Fastrack)

Summary

cars addedGTX Misc Table 4 adds RCR T70 Coupe with 2200 lbs minimum weight, no restrictor specified.

As printed in Fastrack

In GTX-Misc. Table 4, classify RCR70 Coupe:
GTX – MISC. TABLE 4
Make Homologation Model Restrictor

A specification table follows in the original; it is not shown here.

What the rules allowed changed as listed; this does not say what any particular car ran.