BoP Lab / Buttonwillow Raceway Park

F500 vs SRF vs SM pace at Buttonwillow Raceway Park

Quickest here: SM 2:00.831 William Wallis, Cal Club 2025 qualifying

F500SRFSMsolid race · dashed qualifying · slower is lower

	Event	F500			SRF				SM
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs F500	Qual best	Race best	Trap	vs F500
	Cal Club 2026 CALCL262026-02-21								2:01.392Ryan Busk · fastest of 18 · top 5 within 0.8s+0.561s (+0.46%)	2:02.486William Rasmussen · fastest of 18 · top 5 within 1.3s+0.836s (+0.69%)	127.3Sam Rezai+23.4 mph (+22.6%)
6 rule changes (SRF: 3, SM: 3)1 tyres & wheels · 1 wording · 4 othershowhide 2025-10-01 SRF Add HD Oil Cooler #38979other 2025-06-01 SM SMX Data Submission - Penalties #38248other 2025-06-01 SM Committee) SMX Penaly Clarification updated language #38337wording 2025-05-01 SM Clarify Tire Marking Regs #38005tyres & wheels 2025-04-01 SRF Driver Safety & Comfort #37966other 2025-04-01 SRF Update SADEV transmission specs #37992other
	Cal Club 2025 CALCL252025-02-22								2:00.831William Wallis · fastest of 16 · top 5 within 0.9s	2:01.650Nick Leverone · fastest of 16 · top 5 within 0.3s	103.9Evan Jacobs
18 rule changes (SRF: 13, SM: 5)5 suspension & brakes · 5 tyres & wheels · 1 engine · 1 weight · 2 wording · 4 othershowhide 2024-12-01 SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other 2024-10-01 SRF Update SRF3 Air Filter Rule #36681other 2024-10-01 SRF Update SRF Brake Rotor Thickness #36687suspension & brakes 2024-10-01 SRF Hoosier Tire Decal Placement #36739tyres & wheels 2024-09-01 SM SMX Camera Rule Correction #36496wording 2024-09-01 SM Committee) AIM ECU Protocol #36556engine 2024-09-01 SM Committee) OE versus OEM Definitons #36608other 2024-09-01 SM Committee) Shifter Bushing #36611suspension & brakes 2024-09-01 SRF Protest Fee Clarification #36540wording 2024-09-01 SRF Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels 2024-08-01 SRF Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels 2024-01-01 SRF Update SRF Rain / Brake Rule #34706suspension & brakes 2024-01-01 SRF Update SRF Brake Light Rule v1 #34853suspension & brakes 2024-01-01 SRF SRF / SRF3 Rule Updates #35268weight 2023-10-01 SRF SRF Radiator Rule Update #34805other 2023-06-01 SRF Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels 2023-05-01 SRF Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels 2023-03-01 SRF Update SRF Brake Rule #33469suspension & brakes
	Cal Club 2023 CALCL232023-02-24
24 earlier rule changes on record, in force before Cal Club 2023 (from 2019)6 suspension & brakes · 5 weight · 4 engine · 4 tyres & wheels · 1 wording · 4 othershowhide 2023-01-01 SM BOP for NB1 and NB2 #32309weight 2022-06-01 SRF SRF Tire Rule Update #32614tyres & wheels 2022-06-01 SRF Brake, seal, and air filter clarifications #32670suspension & brakes 2022-04-01 SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes 2021-12-01 SRF Three Updates to SRF Rules #31523weight 2021-08-01 SRF SRF Wet Tires #30849tyres & wheels 2021-08-01 SRF SADEV-SRF3 Transmission #30926other 2021-08-01 SRF SRF Update Maintenance, Repairs and Seals #30961engine 2021-06-01 SRF SRF3 Alternator Pulley #30684weight 2021-04-01 SM Updates - Obsolete Parts & BOP Parts #30438other 2021-03-01 SRF Mandatory identification: #30223engine 2020-12-01 SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes 2020-10-01 SM Radiator E&O Clarifications #29294engine 2020-08-01 SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes 2020-05-01 SRF SRF Bump Stop Correction #27019suspension & brakes 202-01-01 SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes 2019-12-01 SRF SRF Tire Warmer Rule #27622tyres & wheels 2019-12-01 SRF SRF / SRF3 Nose Weight Reduction #27706weight 2019-12-01 SRF SRF / SRF3 Majors & Regional Class Updates #27723other 2019-07-01 SRF SRF Dash Windscreen Kit #27028other 2019-03-01 SM Request to allow aftermarket fuel filters. #26370wording 2019-02-01 SM Request 99-00 replacement Wire harnesses #25602engine 2019-02-01 SM Organize and Clarify 9.1.7.C.1.o. #25913weight 2019-02-01 SM Strike Tire Tread Language #26123tyres & wheels

Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it, how many cars set a time that session and how close the top five were; a best from fewer than three cars is greyed. 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.