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BoP Lab / Buttonwillow Raceway Park

F500 vs F6 vs SM pace at Buttonwillow Raceway Park

Class · click a class to switch, + to compare alongside (up to 4)
AS+B Spec+B-Spec+BSpc+EP+F5+vsF6×F500×FA+FB+FC+FE+FE 2+FE2+FF+FM+FP+FV+FX+GT1+GT2+GT3+GT3U+GTL+GTX+HP+P+P1+P2+PX+vsSM×SMX+SRF+SRF3+STL+STU+T1+T2+T3+T4+
Reference class · the others' laps as a share of this one's at the same event, so years compare despite weather; + a class above to measure against it
Track configuration

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

2:012:025 rule changes between Cal Club 2023 and Cal Club 20255 ▾3 rule changes between Cal Club 2025 and Cal Club 20263 ▾SM race best at Cal Club 2025: 2:01.650 (Nick Leverone)SM race best at Cal Club 2026: 2:02.486 (William Rasmussen)SM qualifying best at Cal Club 2025: 2:00.831 (William Wallis)SM qualifying best at Cal Club 2026: 2:01.392 (Ryan Busk)Cal Club 20232023Cal Club 20252025Cal Club 20262026
F500F6SMsolid race · dashed qualifying · slower is lower
EventF500F6SM
Qual bestRace bestTrapQual bestRace bestTrapvs F500Qual bestRace bestTrapvs F500
Cal Club 2026 CALCL262026-02-212:01.392Ryan 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%)
3 rule changes (SM: 3)1 tyres & wheels · 1 wording · 1 othershowhide
  • SM SMX Data Submission - Penalties #38248other
  • SM Committee) SMX Penaly Clarification updated language #38337wording
  • SM Clarify Tire Marking Regs #38005tyres & wheels
Cal Club 2025 CALCL252025-02-222:00.831William Wallis · fastest of 16 · top 5 within 0.9s2:01.650Nick Leverone · fastest of 16 · top 5 within 0.3s103.9Evan Jacobs
5 rule changes (SM: 5)1 engine · 1 suspension & brakes · 1 wording · 2 othershowhide
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • SM SMX Camera Rule Correction #36496wording
  • SM Committee) AIM ECU Protocol #36556engine
  • SM Committee) OE versus OEM Definitons #36608other
  • SM Committee) Shifter Bushing #36611suspension & brakes
Cal Club 2023 CALCL232023-02-24
9 earlier rule changes on record, in force before Cal Club 2023 (from 2019)2 engine · 2 suspension & brakes · 2 weight · 1 tyres & wheels · 1 wording · 1 othershowhide
  • SM BOP for NB1 and NB2 #32309weight
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • SM Radiator E&O Clarifications #29294engine
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • SM Request to allow aftermarket fuel filters. #26370wording
  • SM Request 99-00 replacement Wire harnesses #25602engine
  • SM Organize and Clarify 9.1.7.C.1.o. #25913weight
  • 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.