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BoP Lab / Buttonwillow Raceway Park

GT1 at Buttonwillow Raceway Park

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
Events
PosCarDriverClass#LapTheoreticalQualRace5-lap stintConsistencyTrapS1S2S3
1Lamborghini Huracan GT3 EvoMichael McAleenanGT131:39.857 A-Q11:39.4291:39.857 A-Q11:41.045 A-R21:42.375 A-R2+4.109 A-R2167.6 A-Q127.368 A-Q129.135 A-Q142.926 A-Q1
2Jaguar XKRMichael Lewis 2+ carsGT1121:39.901 A-Q11:39.9011:39.901 A-Q11:41.635 A-R11:42.703 A-R1+2.651 A-R1151.5 A-R127.895 A-Q128.765 A-Q143.241 A-Q1
3Mazda RX-7Michael Lewis 2+ carsGT1321:53.007 B-R21:52.5141:53.007 B-R21:56.277 B-R2+3.466 B-R2110.9 B-R230.700 B-R232.429 B-R249.385 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

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
Lamborghini Huracan GT3 EvoGT111:39.857Michael McAleenan1:39.857Michael McAleenan1:41.045Michael McAleenan167.6Michael McAleenan27.368Michael McAleenan29.135Michael McAleenan42.926Michael McAleenan
Jaguar XKRGT111:39.901Michael Lewis1:39.901Michael Lewis1:41.635Michael Lewis151.5Michael Lewis27.895Michael Lewis28.765Michael Lewis43.241Michael Lewis
Mazda RX-7GT111:53.007Michael Lewis1:53.007Michael Lewis110.9Michael Lewis30.700Michael Lewis32.429Michael Lewis49.385Michael 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.

Rule changes between these events

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

GT1 Request to Classify Acura NSX GT3 Evo 22

#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

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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.

GT1 Correction to Limited prep LS Chevy engine for GT1

#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."

GT1 RM 25-06 GT1 reclassify the Acura NSX GT3 EVO 22 to GT1-ST

#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 Wheelbase
ACURA
NSX GT3 EVO 22 103.5”
DOHC 4v per cylinder EFI Twin Turbo Crossflow V-6 Displacement 3500cc Bore and Stroke 91x90
MAX RPM 7500 MAX BOOST 2.1 bar Weight 3100 lbs
GT1-ST Maximum

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Displacement
Minimum
Weight Restrictor Notes
ACURA NSX GT3 EVO 22 3500cc 3100 Per FIA Homologation GT3-047

GT1 NSX Parity With Other GT3s Let Alone a GT1 Car

#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"

GT1 Request for Addition of Porsche 992.1 GT3 Cup into GT1

#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.