BoP Lab / Buttonwillow Raceway Park

F6 vs SRF vs FB vs FC pace at Buttonwillow Raceway Park

Quickest here: FC 1:11.935 Peter West, Cal Club 2023 qualifying

F6SRFFBFCsolid race · dashed qualifying · slower is lower

	Event	F6			SRF				FB				FC
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs F6	Qual best	Race best	Trap	vs F6	Qual best	Race best	Trap	vs F6
	Cal Club 2026 CALCL262026-02-21												1:45.137Robert Armington · fastest of 4 · top 4 within 25.0s-4.930s (-4.48%)	1:45.314Robert Armington · fastest of 4 · top 4 within 12.9s-3.208s (-2.96%)	147.5Bill Wallschlaeger+33.0 mph (+28.9%)
5 rule changes (SRF: 3, FC: 2)1 weight · 4 othershowhide 2026-01-01 FC F2000 MZR Spec Line Clarity/Revision Requested #38927other 2026-01-01 FC Adjust F2000 Metrik ZF2 weight #39612weight -20 lbs 2025-10-01 SRF Add HD Oil Cooler #38979other 2025-04-01 SRF Driver Safety & Comfort #37966other 2025-04-01 SRF Update SADEV transmission specs #37992other
	Cal Club 2025 CALCL252025-02-22												1:50.067Paul MacFarlane · only car+38.132s (+53.01%)	1:48.522Paul MacFarlane · only car	114.4Paul MacFarlane
19 rule changes (SRF: 13, FC: 6)7 tyres & wheels · 5 weight · 4 suspension & brakes · 1 wording · 2 othershowhide 2024-11-01 FC 9.1.1.10.h. FC Tire Rule #36533tyres & wheels 2024-11-01 FC Change FF/FC Weight with Sequential Gearbox #36651weight 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 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 2024-04-01 FC Four Pot Calipers #35481weight 2024-01-01 FC Please correct omitted punctuation #34890weight 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 2023-07-01 FC Review FC Runoffs Tire Marking Rule #34274tyres & wheels 2023-06-01 FC USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC #34329weight 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												1:11.935Peter West · fastest of 3 · top 3 within 2.6s
28 earlier rule changes on record, in force before Cal Club 2023 (from 2019)8 engine · 7 weight · 4 suspension & brakes · 4 tyres & wheels · 1 induction · 1 wording · 3 othershowhide 2023-01-01 FC E&O 9.1.1.B.16.j #33634engine 2022-07-01 FC Add Specification to Performance Electronics ECU for Ford Zetec #32761engine 2022-06-01 SRF SRF Tire Rule Update #32614tyres & wheels 2022-06-01 SRF Brake, seal, and air filter clarifications #32670suspension & brakes 2022-01-01 FC Clean up Chassis/Frame section #31867engine 2021-12-01 FC Clarify Zetec ECU requirements #31554engine 2021-12-01 SRF Three Updates to SRF Rules #31523weight 2021-11-01 FC Clarify composite anti-intrusion panel language #31426wording 2021-11-01 FC Clarify tire marking requirements #31455tyres & wheels 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 2021-03-01 FC Request for FC Weight Change #30171weight 2021-03-01 SRF Mandatory identification: #30223engine 2020-12-01 SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes 2020-10-01 FC Urgent: SCCA PE3 map unsuitable #29475induction 2020-08-01 FC Request for weight adjustments to equalize FC competition. #28888weight 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 FC Request for Better Zetec Connecting Rods #27710engine 2019-12-01 FC Add Alternate Piston #27795engine 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 2019-05-01 FC E&O Wiseco piston and Crower connecting rod #26659weight 2019-01-01 FC Correct Wiseco piston and connecting rod #25809weight

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.