BoP Lab / Buttonwillow Raceway Park
This track has been raced on 2 configurations (The Circuit, 2.57 mi; 2.92 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 | 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 |
| 2 | 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 |
| 3 | SWIFT DB-6 Honda | Edward Erlandson 2+ cars | FF | 8 | 1:49.259 A-P | 47.766 A-P | ||||||||
| 4 | Piper DL7-Honda | Eric Poulsen | FF | 48 | 1:51.118 B-R1 | 1:50.744 | 1:52.044 B-Q1 | 1:51.118 B-R1 | 1:51.583 B-R1 | +3.025 B-R1 | 114.7 B-R1 | 30.276 B-R1 | 31.650 B-R1 | 48.818 B-R1 |
| 5 | 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 | |
| 6 | SWIFT DB- | Edward Erlandson 2+ cars | FF | 54 | 1:53.098 A-Q1 | 1:53.041 | 1:53.098 A-Q1 | 1:54.741 A-R2 | 1:56.774 A-R2 | +1.819 A-R2 | 133.7 A-Q1 | 30.951 A-Q1 | 32.299 A-Q1 | 49.791 A-Q1 |
| 7 | Swift Db6 | Johnnie Crean | FF | 35 | 1:54.993 A-R2 | 1:54.490 | 1:55.247 A-Q2 | 1:54.993 A-R2 | 1:56.752 A-R2 | +1.519 A-R2 | 124.5 A-R2 | 31.358 A-Q1 | 32.841 A-R2 | 50.291 A-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 |
|---|---|---|---|---|---|---|---|---|---|
| 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 |
| 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 RX-7 | GT1 | 1 | 1:53.007Michael Lewis | 1:53.007Michael Lewis | 110.9Michael Lewis | 30.700Michael Lewis | 32.429Michael Lewis | 49.385Michael Lewis | |
| 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 |
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.
#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)"
#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."
#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."
#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."
#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).
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)."
#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.
#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
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."
#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
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 aboveorFront - Hoosier 44165 135/545-13 VFFRear - 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."
#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."
#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
#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 atleast 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."
#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.