BoP Lab / Buttonwillow Raceway Park

STL pace at Buttonwillow Raceway Park

STLsolid race · dashed qualifying · slower is lower

	Event	STL
	Event	Qual best	Race best	Trap
	Cal Club 2026 CALCL262026-02-21	1:57.526Jared Korth · 10 cars+2.563s (+2.23%)	1:54.845Gavin Wardle · 11 cars-0.837s (-0.72%)	136.6Bryce Johnson+26.2 mph (+23.7%)
3 rule changes (STL: 3)3 weightshowhide 2026-01-01 Weight adjustment for STL #39579weight 2025-08-01 Lotus Weight Reduction #38772weight -50 lbs 2025-05-01 E&O: SMX Allowance in STL #37945weight
	Cal Club 2025 CALCL252025-02-22	1:54.963Nick Leverone · 16 cars	1:55.682Nick Leverone · 17 cars	110.4Ryan Gutile
49 earlier rule changes on record, in force before Cal Club 2025 (from 2019)12 induction · 9 weight · 6 tyres & wheels · 5 engine · 4 suspension & brakes · 3 aero · 3 cars added · 4 wording · 3 othershowhide 2024-12-01 Request to Remove Miata Hubs from General category #37138tyres & wheels 2024-02-01 ST Electric-Assisted Steering Systems #35066other 2024-02-01 BOP Adjustments #35112weight 2024-02-01 Mazda 12A #35320induction 2024-01-01 Alternate Carburetor Request for 79-85 RX7 12a #35181induction 2023-06-01 Clarify STL table B - IT spec notes on Tires #34187tyres & wheels 2023-01-01 Spec MX5 in STL #33473tyres & wheels 2022-03-01 Single TB Weight Modifiers #31449weight 2022-03-01 Improved Touring Tires #32063tyres & wheels 2022-01-01 Throttling Device Clarification #31323induction 2022-01-01 Mazda Renesis Restriction #31467induction 2022-01-01 Clarification of 79-85 RX7 Spec line #31621wording 2021-09-01 Request to clean up Spec MX-5 Redundancy #31069other 2021-06-01 VW Engine Request #30625engine 2021-05-01 Solstice Ride Height #30183suspension & brakes 2021-05-01 Request Mazda B5 DOHC #30420cars added 2021-05-01 Honda B16A (JDM) Restrictor change #30531induction 2021-04-01 ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording 2021-03-01 GM Ecotec engines in STL #30247engine 2021-03-01 Super Touring Alternate Miata Hubs #30345tyres & wheels 2021-02-01 Brake Component Relocation #29990suspension & brakes 2021-02-01 Super Touring Wing Clarification #30111aero 2021-02-01 Transmission Options #30118other 2021-01-01 Request for FWD and RWD Parity #29728weight 2021-01-01 Request to Remove Honda F20C 2% Weight Penalty #29815weight 2021-01-01 Request for FWD and RWD Parity #30023induction 2020-12-01 Request clarification on wing measurement #29640aero 2020-08-01 Minimum Weight Determination #27695weight 2020-08-01 ST Gurney flap Wicker clarification #29012aero 2020-07-01 Request for Addition to GT3 Approved Turbo List #27576induction 2020-06-01 Request to add 2016-2019 GMX-5 Spec line #28604cars added 2020-06-01 Request to update PN for MX-5 #28622wording 2020-06-01 Correction - Clarification Honda/Acura B18B engine Letter # 26209 #28873engine 2020-05-01 STL Honda B18 restrictor changes #28794induction 2020-04-01 Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine 2020-04-01 Acura/Honda B18C engine chart. Reduce the current 54 mm flat plat #28663induction 2020-04-01 Mazda MZR engine chart. Reduce the current 55 mm flat plate to 53 #28664induction 2020-03-01 Request to add wheel part numbers #28342tyres & wheels 2019-10-01 Request to Classify Spec MX-5 Challenge in STL #27399cars added 2019-07-01 Request clarification for manifold and throttle in STU #27004induction 2019-05-31 Request Restrictor Plate correction #26779induction 2019-05-01 Request Ride Height Clarification #26597suspension & brakes 2019-03-01 Request to Allow VW 1.8L Engine #25614engine 2019-03-01 Request to reduce weight of RX8 with Renesis rotary #25781weight -100 lbs 2019-03-01 Request for Open Brake Pads On Mazda MX-5 Cup NC #25821suspension & brakes 2019-03-01 Request to clarify B18C1 GSR Honda B motor table #26209weight 2019-03-01 Port Matching #26415wording 2019-01-01 Request to equalize FPR Reduction on all B-Series Vtec Engines #24746weight 2019-01-01 Request E&O for Mazda Miata Spec Line #25955weight

Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it and how many cars set a time. With two or more classes, "vs" is the gap of each class's best to the first class's at the same event. Newest event first. The coloured figure under each value is the change from the previous event that has one (green is quicker, red slower). Whole laps only, so events with different sector layouts still compare. Weather and track condition are not accounted for.