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BoP Lab / Buttonwillow Raceway Park

FE vs FM vs F500 vs FE2 pace at Buttonwillow Raceway Park

FE at every track →

Lap times across years say as much about the weather as the class. % of FE is each class's best lap as a share of FE's on the same day, so the conditions drop out: 100% is level, less is quicker, and a move in it is the class getting faster or slower against the field.

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
Reference · what % is measured against
Track configuration

Quickest here: FE2 1:08.250 Caleb Shrader, Super Tour Feb 2023 qualifying

1:101:201:301:4021 rule changes between Super Tour Apr 2019 and Super Tour Feb 202321 ▾7 rule changes between Super Tour Feb 2023 and Super Tour Feb 20257 ▾5 rule changes between Super Tour Feb 2025 and Super Tour Feb 20265 ▾FE2 race best at Super Tour Feb 2025: 1:39.712 (Paul Marino)FE2 race best at Super Tour Feb 2026: 1:40.253 (Jon McClintock)FE2 qualifying best at Super Tour Feb 2023: 1:08.250 (Caleb Shrader)FE2 qualifying best at Super Tour Feb 2025: 1:39.358 (Paul Marino)FE2 qualifying best at Super Tour Feb 2026: 1:39.265 (Jon McClintock)Super Tour Apr 2019Super Tour Apr2019Super Tour Feb 2023Super Tour Feb2023Super Tour Feb 2025Super Tour Feb2025Super Tour Feb 2026Super Tour Feb2026
FEFMF500FE2solid race · dashed qualifying · slower is lower
EventFEFMF500FE2
Qual best Race best Trap Qual best Race best Trap vs FE % of FE Qual best Race best Trap vs FE % of FE Qual best Race best Trap vs FE % of FE 
Super Tour Feb 2026 CALCL262026-02-211:39.265Jon McClintock · fastest of 3 · top 3 within 1.5s-0.093s (-0.09%)1:40.253Jon McClintock · fastest of 3 · top 3 within 2.2s+0.541s (+0.54%)156.6Paul Marino+29.4 mph (+23.1%)
5 rule changes (FE: 3, FE2: 2)1 engine · 1 weight · 3 othershowhide
  • FE FE & FE2 Rule Updates #39484engine
  • FE FE & FE2 Bubble Tail #38978other
  • FE2 FE & FE2 Bubble Tail #38978other
  • FE FE & FE2 Rule Updates #38901weight
  • FE2 Driver Safety & Comfort #37965other
Super Tour Feb 2025 CALCL252025-02-221:39.358Paul Marino · fastest of 4 · top 4 within 1.5s+31.108s (+45.58%)1:39.712Paul Marino · fastest of 4 · top 4 within 1.7s127.2Tom Hope
7 rule changes (FE: 7)2 tyres & wheels · 1 suspension & brakes · 1 wording · 3 othershowhide
  • FE Brake Line to A-Arm Covers #37110suspension & brakes
  • FE Protest Fee Clarification #36540wording
  • FE Update on Letter 36620 with new Hoosier Contingency Decal Info #36625tyres & wheels
  • FE Hoosier Tire Decal Placement #36435tyres & wheels
  • FE Update FE Rain Light Rule #34707other
  • FE FE/FE2 rule update #35269other
  • FE Update FE SADEV Transmission Rule #33883other
Super Tour Feb 2023 CALCL232023-02-241:08.250Caleb Shrader · fastest of 4 · top 4 within 5.8s
21 rule changes (FE: 19, FE2: 2)4 suspension & brakes · 4 tyres & wheels · 3 aero · 3 weight · 2 engine · 2 wording · 3 othershowhide
  • FE Brake bias adjuster clarification #33084suspension & brakes
  • FE FE Front and Rear Wing Update & Clarification #33089aero
  • FE Engine Heat Shield & Insulation #33019engine
  • FE Update FE/FE2 Tire Rule #32613tyres & wheels
  • FE Master cylinder clarification #32669engine
  • FE Two FE2 Rule Updates #31524other
  • FE FE Tire Rule Changes #30754tyres & wheels
  • FE Radiator Screens Clarification #30792wording
  • FE FE Radiator Screens #30575other
  • FE FE / FE2 Spring Updates #29689suspension & brakes
  • FE FE Gurney Flap Spec Update #29445aero
  • FE2 FE/FE2 Oil Cooler #29293wording
  • FE FE Gurney flap wicker clarification #28885aero
  • FE FE spring rule update changed to November 1, 2020 #28814suspension & brakes
  • FE Request for FE / FE2 preparation rules update #27722weight
  • FE FE / FE2 Update Rules #27624weight
  • FE2 FE / FE2 Update Rules #27624weight
  • FE FE Wet Tire E&O #27365tyres & wheels
  • FE FE Tire Update #27029tyres & wheels
  • FE FE Anti-Roll Bar Clarification #26912suspension & brakes
  • FE FE / FE2 Updated Bubble Tail Rule #26913other
Super Tour Apr 2019 ST19APR262019-04-26
1 earlier rule change on record, in force before Super Tour Apr 2019 (from 2019)1 tyres & wheelsshowhide
  • FE Request to Update Hoosier Rain Tire Part Number for the FE cars #26235tyres & wheels
About this data
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. "% of FE" is the class's best as a share of FE's best at the same event (100% is level, less is quicker): weather and track condition move every class together, so this compares across years where the raw times do not. It still breaks when FE's own field changes or one session was wet and another dry. 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.