BoP Lab / Buttonwillow Raceway Park
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.
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.
| Pos | Car | Driver | Class | # | Lap | Theoretical | Qual | Race | 5-lap stint | Consistency | Trap | S1 | S2 | S3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Formula Enterprise (2023) | Blake Pigeon | FE2 | 108 | 1:12.402 D-Q2 | 1:12.402 D-Q2 | ||||||||
| 2 | SCCA Ent FE2 (2007) | John Yeatman | FE2 | 22 | 1:13.988 D-Q2 | 1:13.988 D-Q2 | ||||||||
| 3 | SCCA Ent FE2 (2010) | Thomas W Burt | FE2 | 45 | 1:14.003 D-Q2 | 1:14.003 D-Q2 | ||||||||
| 4 | SCCA Ent FE2 | Jon McClintock >115% | FE2 | 23 | 1:39.265 A-Q2 | 1:39.265 | 1:39.265 A-Q2 | 1:40.253 A-R1 | 1:40.602 A-R1 | +1.377 A-R1 | 152.6 A-Q2 | 27.464 A-Q2 | 28.773 A-Q2 | 43.028 A-Q2 |
| 5 | SCCA Ent FE2 | Paul Marino >115% | FE2 | 44 | 1:39.358 B-Q2 | 1:39.209 | 1:39.358 B-Q2 | 1:39.712 B-R1 | 1:40.188 B-R1 | +0.849 B-R1 | 156.6 A-Q1 | 27.234 B-Q2 | 28.582 B-R1 | 43.393 B-Q2 |
| 6 | SCCA Ent FE2 | Tom Hope >115% | FE2 | 18 | 1:39.452 B-Q2 | 1:39.393 | 1:39.452 B-Q2 | 1:39.992 B-R1 | 1:40.186 B-R1 | +0.531 B-R1 | 125.6 B-Q1 | 27.375 B-Q2 | 28.661 B-Q2 | 43.357 B-Q1 |
| 7 | Lamborghini Huracan GT3 Evo | Michael McAleenan | GT1 | 3 | 1:39.857 A-Q1 | 1:39.429 | 1:39.857 A-Q1 | 1:41.045 A-R2 | 1:42.375 A-R2 | +4.109 A-R2 | 167.6 A-Q1 | 27.368 A-Q1 | 29.135 A-Q1 | 42.926 A-Q1 |
| 8 | Jaguar XKR | Michael Lewis 2+ cars | GT1 | 12 | 1:39.901 A-Q1 | 1:39.901 | 1:39.901 A-Q1 | 1:41.635 A-R1 | 1:42.703 A-R1 | +2.651 A-R1 | 151.5 A-R1 | 27.895 A-Q1 | 28.765 A-Q1 | 43.241 A-Q1 |
| 9 | SCCA Ent FE2 | Tom Burt >115% | FE2 | 45 | 1:40.774 B-Q1 | 1:40.569 | 1:40.774 B-Q1 | 1:40.955 B-R1 | 1:41.516 B-R1 | +0.989 B-R1 | 154.7 A-R1 | 27.836 B-R1 | 29.021 A-Q2 | 43.712 B-Q1 |
| 10 | SCCA Ent FE2 | Noah Hambayi >115% | FE2 | 64 | 1:40.848 B-Q2 | 1:40.673 | 1:40.848 B-Q2 | 1:41.416 B-R2 | 1:41.703 B-R2 | +1.034 B-R2 | 142.4 B-P | 27.646 B-R2 | 28.966 B-Q2 | 44.061 B-P |
| 11 | Mazda RX-7 | Michael Lewis 2+ cars | GT1 | 32 | 1:53.007 B-R2 | 1:52.514 | 1:53.007 B-R2 | 1:56.277 B-R2 | +3.466 B-R2 | 110.9 B-R2 | 30.700 B-R2 | 32.429 B-R2 | 49.385 B-R2 |
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 are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.
| Car | Class | Drivers | Lap | Qual | Race | Trap | S1 | S2 | S3 |
|---|---|---|---|---|---|---|---|---|---|
| Formula Enterprise | FE2 | 1 | 1:12.402Blake Pigeon | 1:12.402Blake Pigeon | |||||
| SCCA Ent FE2 | FE2 | 7 | 1:13.988John Yeatman | 1:13.988John Yeatman | 1:39.712Paul Marino | 156.6Paul Marino | 27.234Paul Marino | 28.582Paul Marino | 43.028Jon McClintock |
| SCCA Ent FE2 (2007) | FE2 | 1 | 1:13.988John Yeatman | 1:13.988John Yeatman | |||||
| SCCA Ent FE2 (2010) | FE2 | 1 | 1:14.003Thomas W Burt | 1:14.003Thomas W Burt | |||||
| SCCA Ent FE2 | FE2 | 5 | 1:39.265Jon McClintock | 1:39.265Jon McClintock | 1:39.712Paul Marino | 156.6Paul Marino | 27.234Paul Marino | 28.582Paul Marino | 43.028Jon McClintock |
| Lamborghini Huracan GT3 Evo | GT1 | 1 | 1:39.857Michael McAleenan | 1:39.857Michael McAleenan | 1:41.045Michael McAleenan | 167.6Michael McAleenan | 27.368Michael McAleenan | 29.135Michael McAleenan | 42.926Michael McAleenan |
| Jaguar XKR | GT1 | 1 | 1:39.901Michael Lewis | 1:39.901Michael Lewis | 1:41.635Michael Lewis | 151.5Michael Lewis | 27.895Michael Lewis | 28.765Michael Lewis | 43.241Michael Lewis |
| Mazda RX-7 | GT1 | 1 | 1:53.007Michael Lewis | 1:53.007Michael Lewis | 110.9Michael Lewis | 30.700Michael Lewis | 32.429Michael Lewis | 49.385Michael Lewis |
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.
#33804 from Gary D'Abate · Rule change · TB 23-04 (2023-04 Fastrack)
neutralGT1 Mercedes AMG GT3 16-19 preparation wording changed to per FIA GT3 homologation.In GT1-ST Spec Lines, Mercedes Benz AMG GT3 (16-19), change Notes as follows:
"Car must be prepared to per its FIA GT3 homologation. except as specified differently within the GT1 class rules."
#33784 from James Rogersn · Rule change · TB 23-05 (2023-05 Fastrack)
neutralFields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.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
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.
#34453 from David Gomberg · Rule change · TB 23-12 (2023-12 Fastrack)
neutralGTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL.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
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.
#34929 from Michael McAleenan · Rule change · TB 24-01 (2024-01 Fastrack)
neutralLamborghini Huracan GT3 EVO(1) and GT3 added to GT1-ST at 3000 and 3100 lbs minimum weight respectively.In GT1-ST Spec Lines, classify Lamborghini Huracan GT3 EVO(1) (2018-) as follows:
GT1-ST Maximum Displacement Minimum Weight Restrictor Notes
Lamborghini Huracan
GT3 EVO(1)
(2018-)
5204 3000 2 X39mm Per FIA Homologation
GT3-040
In GT1-ST Spec Lines, classify Lamborghini Huracan GT3 (2019-) as follows:
GT1-ST Maximum Displacement Minimum Weight Restrictor Notes
Lamborghini
Huracan GT3
2019-
5204 3100 52mm Per FIA Homologation
GT3-040
#35040 from Pater Mumford · Rule change · TB 24-01 (2024-01 Fastrack)
neutralGT1 Trick Flow Specialties Ultra 18 Degree GM Cylinder Head Part #TFS-3181T001-CO1 allowed.In GCR, Section 9.1.2.D.1.e.3., add at the end of section add the follows:
"Trick Flow Specialties Ultra 18 Degree GM Cylinder Head assembly Part #TFS-3181T001-CO1 is allowed."
#35261 from Butch Kummer · Rule change · TB 24-02 (2024-01 Fastrack)
fasterGT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed.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.”
#35437 from Grand Touring Committee · Rule change · TB 24-02 (2024-01 Fastrack)
fasterGT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors.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.”
#35439 from Grand Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)
fasterGT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E.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.”
#35009 from Kristofer Olson · Rule change · TB 24-05 (2024-05 Fastrack)
slowerGT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR.In GT2-ST Spec Lines, Acura NSX, change as follows:
Minimum Weight: "2700 3000"
Restrictor: "43 45mm TIR"
#35652 from John Bodnar · Rule change · TB 24-05 (2024-05 Fastrack)
neutralGT1 Camaro 1993-2002 classification updated; 2010- model separately classified.In GCR, Section 9.1.2.E.1.b.3., change as follows:
"Camaro (1993-2002)"
#36230 from Wayne Graham · Rule change · TB 24-09 (2024-09 Fastrack)
neutralGT1 Mazda 26B engine classified at 2850 lbs minimum weight.In GT1 Spec Lines, GT1 Approved Automobile List, Mazda, add the following:
"(Effective 11/1/2024) 26B engine = 2850 lbs."
#36254 from Michael McAleenan · Rule change · TB 24-12 (2024-12 Fastrack)
fasterGT1-ST Lamborghini Huracan GT3 Evo and 2019+ GT3 both shift to Unrestricted from 39mm and 52mm restrictors.In GT1-ST Spec Lines, Lamborghini Huracan GT3 EVO(1) (2018-), change Restrictor as follows:
"2 X 39mmUnrestricted"
In GT1-ST Spec Lines, Lamborghini Huracan GT3 (2019-), change Restrictor as follows:
"52mm Unrestricted"
#37045 from Robert Logsdon · Rule change · TB 25-01 (2025-01 Fastrack)
neutralGT1 LS1 Limited Prep engine added, 2600 lbs with driver, 383 cubic inches max, hydraulic roller cam, 750 cfm carb.In GCR, Section 9.1.2. GT1 Spec Lines, GT1 Approved Automobile List, LS1 V8 engine allowed with stock intake, add the
following:
"LS1 Limited Prep GT1 motor
2600 # with driver
Blocks : GM castings or aftermarket, no lightening, Max volume 383 cubic inches
Cylinder Heads: GM LS castings or aftermarket, stock valve angle, intake and exhaust ports must be in stock location, porting
and polishing allowed
Valves: No titanium valves, must be stock size for head part number
Rockers: Factory 1.7 rockers only, aftermarket trunion mod allowed
Pushrods: Free
Intake manifold: stock EFI for variant used or GM 525 carb intake or Edelbrock carb variants ie: Performer RPM, Victor, Victor Jr.
or similar.
Camshaft: Hydraulic roller only, standard journal size, lift and duration free
Timing chain: single or double roller type only
water pump: stock or aftermarket in stock location
Harmonic dampener: SFI approved,
Pistons: Factory or aftermarket flat top pistons only, valve reliefs allowed, coatings allowed
Crankshaft: Factory or forged steel aftermarket, 50 lb min. weight
Rods: GM stock or aftermarket forged steel
Carburetor: one 4150 type 750 cfm max"
#37137 from Christopher Childs · Rule change · TB 25-01 (2025-01 Fastrack)
neutralTA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement.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.
#37481 from Grand Touring Committee · Rule change · TB 25-01 (2025-01 Fastrack)
unclearGT1-ST restrictor sizes removed for 13 cars; new specs not printed in letter.In GT1-ST SPEC LINES, change as follows:
Aston Martin Vantage GT3 (2012) :
Restrictor: "2 x 41.5mm"
Audi R8 LMS Ultra GT3 (10-14) :
Restrictor: "2 x 49mm"
BMW Z4 GT3 (10-13):
Restrictor: "70mm"
Chevrolet Corvette C8 (20-):
Restrictor: "71mm- Flat Plate"
Dodge Viper GT3R (2012-):
Restrictor: "2 x 40mm"
Dodge Viper, incl Comp Coupe, ACR/ACR-X Max Displacement 8400, Weight 3200:
Restrictor: "68mm flat plate"
Ferrari 458 GT3 (2011-):
Restrictor: "2 x 43mm"
Lamborghini Gallardo GT3 (2013):
Restrictor: "2 x 47mm"
Lamborghini Huracan GT3 EVO(1) (2018-):
Restrictor: "2 X39mm"
McLaren MP12C GT3 (2013-):
Restrictor: "2 x 36mm 1.50 bar"
Lamborghini Huracan GT3 (2019-):
Restrictor: "2 x 40 mm"
McLaren MP12C GT3 (2013-):
Restrictor: "2 x 40 mm"
Mercedes Benz SLS GT3 (2011-):
Restrictor: "2 x 36 mm"
Porsche 991 GT3-R (2016):
Restrictor: "(2) 35 mm"
Porsche 997 GT3 R (2013-):
Restrictor: "65mm"
#37367 from Taz Harvey · Rule change · TB 25-03 (2025-03 Fastrack)
neutralAcura NSX GT3 EVO 22 classified in GT1 with 3500cc twin turbo V-6, 3100 lbs, max RPM 7500.In GT1 Spec Lines, GT 1 Cars - ACURA, classify Acura NSX GT3 EVO 22 as follows:
GT 1 Cars - ACURA
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Acura NSX GT3 EVO 22 N/A 2dr RWD 103.5 Ground Clearance 50mm
In GT1 Spec Lines, GT 1 Engines - ACURA, classify Crossflow V-6 as follows:
GT 1 Engines - ACURA
Engine
Family
Engine Type Bore x
A specification table follows in the original; it is not shown here.
#37965 from Robey Clark · Rule change · TB 25-04 (2025-04 Fastrack)
neutralFE2 allows driver safety and comfort modifications for disabled drivers with SCCA approval, not transferable to other drivers.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."
#38902 from Robert Logsdon · Rule change · TB 25-09 (2025-09 Fastrack)
neutralGT1 LS Limited Prep Engine expands to include LS1, LS2, LS3, LS6 with 11:1 max compression.In GCR, Section 9.1.2. GT1 Spec Lines, GT1 Approved Automobile List, LS1 engine allowed with stock intake, make the following
change:
"LS1 Limited Prep GT1 Motor Chevy LS Limited Prep Engine including LS1, LS2, LS3 and LS6."
"Pistons: Factory or aftermarket flat top pistons only, valve reliefs allowed, coatings allowed. Maximum compression ratio
11:1."
#38978 from Robey Clark · Rule change · TB 25-10 (2025-10 Fastrack)
neutralFE and FE2 Enterprises must use bubble tail P/N WM138014; FE2 allows only this configuration.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."
#39101 from Club Racing Board · Rule change · TB 25-10 (2025-10 Fastrack)
neutralAcura NSX GT3 EVO 22 reclassified from GT1 to GT1-ST with 3100 lbs minimum weight.IN GT1 reclassify the Acura NSX GT3 EVO 22 to GT1-ST as follows:
GT1 Approved Automobile List
Make/Model WheelbaseACURANSX GT3 EVO 22 103.5”DOHC 4v per cylinder EFI Twin Turbo Crossflow V-6 Displacement 3500cc Bore and Stroke 91x90MAX RPM 7500 MAX BOOST 2.1 bar Weight 3100 lbs
GT1-ST Maximum
Displacement
Minimum
Weight Restrictor Notes
ACURA NSX GT3 EVO 22 3500cc 3100 Per FIA Homologation GT3-047
#39311 from Taz Harvey · Rule change · TB 26-01 (2026-01 Fastrack)
fasterGT1-ST Acura NSX GT3 EVO 22 weight drops 100 lbs to 3000 lbs.In GT1-ST, Acura NSX GT3 EVO 22, change Weight as follows:
"3100 3000"
#39322 from Erik Madsen · Rule change · TB 26-02 (2026-02 Fastrack)
neutralGT1 adds Porsche 992.1 GT3 Cup (2022-2025) with OEM ABS, traction control, RSR bumper, canards, and any exhaust allowed.In 9.1.2. GT1 Spec Lines, add the following:
"992.1 GT3 Cup (2022-2025)
OEM ABS and Traction Control allowed. Porsche OEM RSR bumper and canards allowed. Any exhaust system may be utilized."
What the rules allowed changed as listed; this does not say what any particular car ran.