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BoP Lab / Buttonwillow Raceway Park

F500 vs SRF vs FF 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+F6+F500×FA+FB+FC+FE+FE 2+FE2+vsFF×FM+FP+FV+FX+GT1+GT2+GT3+GT3U+GTL+GTX+HP+P+P1+P2+PX+SM+SMX+vsSRF×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: FF 1:51.118 Eric Poulsen, Cal Club 2025 race

1:511:521:531:541:556 rule changes between Cal Club 2025 and Cal Club 20266 ▾FF race best at Cal Club 2025: 1:51.118 (Eric Poulsen)FF race best at Cal Club 2026: 1:54.741 (Edward Erlandson)FF qualifying best at Cal Club 2025: 1:52.044 (Eric Poulsen)FF qualifying best at Cal Club 2026: 1:53.098 (Edward Erlandson)Cal Club 20252025Cal Club 20262026
F500SRFFFsolid race · dashed qualifying · slower is lower
EventF500SRFFF
Qual bestRace bestTrapQual bestRace bestTrapvs F500Qual bestRace bestTrapvs F500
Cal Club 2026 CALCL262026-02-211:53.098Edward Erlandson · fastest of 2+1.054s (+0.94%)1:54.741Edward Erlandson · fastest of 2+3.623s (+3.26%)133.7Edward Erlandson+19.0 mph (+16.5%)
6 rule changes (SRF: 3, FF: 3)3 tyres & wheels · 3 othershowhide
  • FF Formula F Alternative Tire Rule Proposed Clarifications #39281tyres & wheels
  • SRF Add HD Oil Cooler #38979other
  • FF Page 228, FF tire rule 9.1.1.10.e #38251tyres & wheels
  • SRF Driver Safety & Comfort #37966other
  • SRF Update SADEV transmission specs #37992other
  • FF Formula F Proposal to Invite Older Cars Via a Tire Rule Change #37802tyres & wheels
Cal Club 2025 CALCL252025-02-221:52.044Eric Poulsen · only car1:51.118Eric Poulsen · only car114.7Eric Poulsen
43 earlier rule changes on record, in force before Cal Club 2025 (from 2019)11 engine · 9 tyres & wheels · 8 suspension & brakes · 6 weight · 1 induction · 2 wording · 6 othershowhide
  • FF Change FF/FC Weight with Sequential Gearbox #36651weight
  • FF Alternative Oversize Honda Fit Pistons #37064weight
  • FF Update to FF EGR Blanking Plate Rule #36633engine
  • SRF Update SRF3 Air Filter Rule #36681other
  • SRF Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF Hoosier Tire Decal Placement #36739tyres & wheels
  • SRF Protest Fee Clarification #36540wording
  • SRF Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels
  • SRF Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • FF Honda Fit Oversize Piston Rings #35305other
  • SRF Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF SRF / SRF3 Rule Updates #35268weight
  • SRF SRF Radiator Rule Update #34805other
  • SRF Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • SRF Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • FF Add Fast Forward Part Numbers for Honda Fit Engine #33752engine
  • SRF Update SRF Brake Rule #33469suspension & brakes
  • SRF SRF Tire Rule Update #32614tyres & wheels
  • SRF Brake, seal, and air filter clarifications #32670suspension & brakes
  • SRF Three Updates to SRF Rules #31523weight
  • SRF SRF Wet Tires #30849tyres & wheels
  • SRF SADEV-SRF3 Transmission #30926other
  • SRF SRF Update Maintenance, Repairs and Seals #30961engine
  • SRF SRF3 Alternator Pulley #30684weight
  • FF Kent crankshaft clarification #30426wording
  • SRF Mandatory identification: #30223engine
  • FF Allow Optional Coolant Bleed Line to Correct a Known Problem #29673engine
  • FF Clarification regarding Honda LC1 ECU implementation date #29684engine
  • SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes
  • FF Clarification regarding Honda LC1 ECU implementation #29135engine
  • SRF SRF Bump Stop Correction #27019suspension & brakes
  • FF E&O FF Kent Engine alternator language #28204engine
  • FF Honda Racing HPD low cost ECU proposal #27563engine
  • FF Update rain tire designation #28443tyres & wheels
  • SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • SRF SRF Tire Warmer Rule #27622tyres & wheels
  • SRF SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF SRF / SRF3 Majors & Regional Class Updates #27723other
  • SRF SRF Dash Windscreen Kit #27028other
  • FF Request for Oversize Honda Fit Pistons #25810engine
  • FF Heat Shield - Fit Intake #26102induction
  • FF Request catch cans/tanks clarification #26158engine

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.