BoP Lab / Buttonwillow Raceway Park
This track has been raced on 3 configurations (The Circuit, 2.57 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.
| Pos | Car | Driver | Class | # | Lap | Theoretical | Qual | Race | 5-lap stint | Consistency | Trap | S1 | S2 | S3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Elan DP02/Mazda | Jim Devenport | P | 23, 28 | 1:32.576 A-P | 1:32.284 | 1:32.872 B-Q2 | 1:33.972 B-R2 | 1:35.195 B-R1 | +1.742 B-R1 | 171.9 A-P | 25.461 B-Q2 | 26.606 A-P | 40.217 A-P |
| 2 | Dauntless Stohr | Johnnie Crean | P | 3, 135 | 1:36.516 B-Q1 | 1:36.516 | 1:36.516 B-Q1 | 1:39.209 B-R1 | 1:40.027 B-R1 | +1.943 B-R1 | 157.4 B-P | 25.956 B-Q1 | 28.143 B-Q1 | 42.417 B-Q1 |
| 3 | Dauntless-Stohr P07d | John Manfroy | P | 08 | 1:37.287 A-R2 | 1:36.339 | 1:41.818 A-Q1 | 1:37.287 A-R2 | 1:39.027 A-R2 | +2.902 A-R2 | 160.4 A-R2 | 26.696 A-R2 | 27.257 A-R2 | 42.386 A-R2 |
| 4 | Stohr WF1 | Kevin Mitz | P | 13 | 1:38.716 A-Q2 | 1:38.667 | 1:38.716 A-Q2 | 1:39.638 A-R2 | 1:40.087 A-R2 | +0.641 A-R2 | 155.4 A-Q1 | 26.934 A-Q2 | 28.397 A-Q2 | 43.336 A-Q2 |
| 5 | Penton Norma M20FC | Joseph Moran | P | 7 | 1:39.296 A-Q2 | 1:38.868 | 1:39.296 A-Q2 | 1:40.832 A-R1 | 1:42.328 A-R1 | +3.544 A-R1 | 149.0 A-Q2 | 27.106 B-Q1 | 28.111 A-Q1 | 43.651 A-Q1 |
| 6 | 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 |
| 7 | 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 |
| 8 | 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 |
|---|---|---|---|---|---|---|---|---|---|
| Elan DP02/Mazda | P | 1 | 1:32.576Jim Devenport | 1:32.872Jim Devenport | 1:33.972Jim Devenport | 171.9Jim Devenport | 25.461Jim Devenport | 26.606Jim Devenport | 40.217Jim Devenport |
| Dauntless Stohr | P | 2 | 1:36.516Johnnie Crean | 1:36.516Johnnie Crean | 1:37.287John Manfroy | 160.4John Manfroy | 25.956Johnnie Crean | 27.257John Manfroy | 42.386John Manfroy |
| Dauntless Stohr | P | 1 | 1:36.516Johnnie Crean | 1:36.516Johnnie Crean | 1:39.209Johnnie Crean | 157.4Johnnie Crean | 25.956Johnnie Crean | 28.143Johnnie Crean | 42.417Johnnie Crean |
| Dauntless-Stohr P07d | P | 1 | 1:37.287John Manfroy | 1:41.818John Manfroy | 1:37.287John Manfroy | 160.4John Manfroy | 26.696John Manfroy | 27.257John Manfroy | 42.386John Manfroy |
| Stohr WF1 | P | 1 | 1:38.716Kevin Mitz | 1:38.716Kevin Mitz | 1:39.638Kevin Mitz | 155.4Kevin Mitz | 26.934Kevin Mitz | 28.397Kevin Mitz | 43.336Kevin Mitz |
| Penton Norma M20FC | P | 1 | 1:39.296Joseph Moran | 1:39.296Joseph Moran | 1:40.832Joseph Moran | 149.0Joseph Moran | 27.106Joseph Moran | 28.111Joseph Moran | 43.651Joseph Moran |
| 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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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"
#37606 from Club Racing Board · Rule change · TB 25-02 (2025-02 Fastrack)
In Prototype Engine Table, Spec Line B, change the notes as follows:
"Staudacher cars may run 950 lb min. wt. minimum weight with 38.5mm flat plate intake restrictor."
In Prototype Engine Table, Spec Line D, change the notes as follows:
"No restrictor required at 1150 lb min. wt. minimum weight."
#37653 from Club Racing Board · Rule change · TB 25-02 (2025-02 Fastrack)
In Categories and Classes, GCR section 9.1, change as follows:
"9.1.8. SPORTS RACING CATEGORY CLASSES
A Sports Racing (ASR) Regional Class
Prototype 1 (P1)"
In Homologation Requirements, GCR section 9.2.2, change as follows:
"All Formula, Sports Racing, and P1, and P2 cars must be constructed in strict accordance with the rules and regulations
contained in the current GCR unless specifically excepted."
In Non-Metallic Wheel/Chassis Construction, GCR section 9.3.37, change as follows:
"Non-metallic wheel construction is prohibited. Non-metallic chassis construction is prohibited, except in ASR, P1, FS and FA."
In Appendix B, GCR section 1.4.2.G, change as follows:
"It is preferable not to combine GT1, AS, T1, T2, T3, and STU with P1, P2, SRF, FP, HP, or GTL."
In Appendix C, GCR section 2.6.G, change as follows:
"A 14 or 15 year-old must complete his first SCCA driver school in a car not classed in GT1, GT2, FA, FB, F S, ITR, ASR, P1, P2, or
T1."
In Appendix E, section 1, change as follows:
"Depending on the length and banking of the oval course being used, it is recommended that Regions consider restricting the
faster classes (GT1, FA, and P 1) from competition at oval track events."
In Sports Racing Category, GCR section 9.1.8.1, change as follows:
"The SCCA Sports Racing Category shall be for automobiles which are designed and constructed for road racing competition,
offering provisions for a driver and passenger, or a driver alone (single-seater). They shall conform to the following
requirements. Sports Racers Cars except SRF & SRF3 homologated prior to 1-1-2014 are eligible to compete as P1 or P2 as long
as they meet applicable class rules,; no re-homologation is required."
"Single seat Formula car chassis (Ex.: FA, FC, FF, FV) fitted with enclosed bodies (as specified in these rules) may run in a Sports
Racing/Prototype Class (ASR, P 1, P2) provided they comply with the requirements of the Classification Specification and GCR
Section 9."
In Sports Racing Category, GCR section 9.1.8.2, change as follows:
"In an effort to control shock/damper technology and cost to a level reasonable for Road Racing, in ASR, P1, and P2, any fluid
dampers are allowed with the following restrictions:"
#37367 from Taz Harvey · Rule change · TB 25-03 (2025-03 Fastrack)
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.
#38150 from Club Racing Board · Rule change · TB 25-05 (2025-05 Fastrack)
In P Engine Table, Spec Line D notes, add the following:
"No restrictor required at 1150 lbs. minimum weight."
In P Engine Table, Spec Line G notes, add the following:
"Group CN non-composite chassis with Honda K20A-FD2 may use unrestricted individual throttle bodies at 1500 lbs. minimum
weight."
In P Table 1, Beasley B2 spec line notes, add the following:
"Engine must be Mazda 12A rotary with 40.5mm venturi. Car must comply with all other Prototype requirements."
In P Table 1, P2 cars built to 2000cc auto-based specification spec line notes, add the following:
"Car must comply with all other P2 rules applicable to cars using stock production-based four-cylinder automotive engines.
Note: Competitors are also free to modify their cars to comply with the general Prototype rules and Engine Table Spec Line H
instead."
#38929 from Club Racing Board · Rule change · TB 25-09 (2025-09 Fastrack)
Effective 8/1/25 in Prototype Engine Table, Spec Line A, change the restrictor as follows:
"40mm 38mm Restricted Venturi Size"
#38856 from Jason Vinkemulder · Rule change · TB 25-09 (2025-09 Fastrack)
Effective 9/1/25 in Prototype Engine Table, Spec Line K, change the restrictor as follows:
"40mm SIR with fuel injection or 41.5mm venturi with carburetor"
#38902 from Robert Logsdon · Rule change · TB 25-09 (2025-09 Fastrack)
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."
#38916 from Club Racing Board · Rule change · TB 25-09 (2025-09 Fastrack)
Effective 9/1/25 in Prototype Table 1 (Spec Line Cars), add the following:
#38943 from Club Racing Board · Rule change · TB 25-09 (2025-09 Fastrack)
Effective 9/1/25, in Prototype, GCR section 9.1.8.B.K, change as follows:
"P2 cars may compete in either the Prototype class or the P2 class but must participate in the Prototype class to the extentnecessary to qualify for an invitation to the Runoffs in Prototype. P2 cars may be modified to comply with the general Prototype
rules and Prototype Engine Table or may continue to run in P2 specification in the Prototype class as permitted in Table 1 below."
Table 1 (Spec Line Cars)
A specification table follows in the original; it is not shown here.
#39101 from Club Racing Board · Rule change · TB 25-10 (2025-10 Fastrack)
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)
In GT1-ST, Acura NSX GT3 EVO 22, change Weight as follows:
"3100 3000"
#39476 from Jeffrey Lederman · Rule change · TB 26-01 (2026-01 Fastrack)
In Prototype, GCR section 9.1.8.B.F.2, change as follows:
"Brake calipers may be ferrous or aluminum alloy. Effective 1/1/2026, carbon-carbon and carbon-ceramic brake rotors areprohibited and rotors must be ferrous. Brake rotor material is unrestricted."
#39322 from Erik Madsen · Rule change · TB 26-02 (2026-02 Fastrack)
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.