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BoP Lab / Buttonwillow Raceway Park

FE vs FB vs FM vs SRF3 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: SRF3 1:50.233 Caleb Shrader, Super Tour Feb 2025 qualifying

1:501:511:5259 rule changes between Super Tour Apr 2019 and Super Tour Feb 202559 ▾7 rule changes between Super Tour Feb 2025 and Super Tour Feb 20267 ▾SRF3 race best at Super Tour Feb 2025: 1:50.825 (Caleb Shrader)SRF3 race best at Super Tour Feb 2026: 1:52.070 (Asad Nikadambaev)SRF3 qualifying best at Super Tour Feb 2025: 1:50.233 (Caleb Shrader)SRF3 qualifying best at Super Tour Feb 2026: 1:50.913 (Asad Nikadambaev)Super Tour Apr 2019Super Tour Apr2019Super Tour Feb 2025Super Tour Feb2025Super Tour Feb 2026Super Tour Feb2026
FEFBFMSRF3solid race · dashed qualifying · slower is lower
EventFEFBFMSRF3
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 CALCL262026-02-211:50.913Asad Nikadambaev · fastest of 27 · top 5 within 1.1s+0.680s (+0.62%)1:52.070Asad Nikadambaev · fastest of 27 · top 5 within 0.8s+1.245s (+1.12%)138.9Paul Marino+20.7 mph (+17.5%)
7 rule changes (FE: 3, SRF3: 4)2 weight · 1 engine · 4 othershowhide
  • FE FE & FE2 Rule Updates #39484engine
  • FE FE & FE2 Bubble Tail #38978other
  • SRF3 Add HD Oil Cooler #38979other
  • FE FE & FE2 Rule Updates #38901weight
  • SRF3 SRF Rule Updates #38853weight
  • SRF3 Driver Safety & Comfort #37966other
  • SRF3 Update SADEV transmission specs #37992other
Super Tour Feb 2025 CALCL252025-02-221:50.233Caleb Shrader · fastest of 33 · top 5 within 0.4s1:50.825Caleb Shrader · fastest of 32 · top 5 within 0.8s118.2John Black
59 rule changes (FE: 26, SRF3: 33)16 suspension & brakes · 15 tyres & wheels · 7 weight · 4 engine · 3 aero · 2 wording · 12 othershowhide
  • FE Brake Line to A-Arm Covers #37110suspension & brakes
  • SRF3 Update SRF3 Air Filter Rule #36681other
  • SRF3 Update SRF Brake Rotor Thickness #36687suspension & brakes
  • SRF3 Hoosier Tire Decal Placement #36739tyres & wheels
  • FE Protest Fee Clarification #36540wording
  • FE Update on Letter 36620 with new Hoosier Contingency Decal Info #36625tyres & wheels
  • SRF3 Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels
  • FE Hoosier Tire Decal Placement #36435tyres & wheels
  • SRF3 Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels
  • SRF3 SRF3 Alternator Pulley Update In #36095weight
  • FE Update FE Rain Light Rule #34707other
  • FE FE/FE2 rule update #35269other
  • SRF3 Update SRF Rain / Brake Rule #34706suspension & brakes
  • SRF3 Update SRF Brake Light Rule v1 #34853suspension & brakes
  • SRF3 SRF / SRF3 Rule Updates #35268weight
  • SRF3 SRF Radiator Rule Update #34805other
  • SRF3 Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels
  • SRF3 Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels
  • FE Update FE SADEV Transmission Rule #33883other
  • SRF3 Update SRF Brake Rule #33469suspension & brakes
  • SRF3 Update SRF Bodywork Fitment Rule #33765tyres & wheels
  • 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
  • SRF3 SRF Tire Rule Update #32614tyres & wheels
  • SRF3 Brake, seal, and air filter clarifications #32670suspension & brakes
  • FE Two FE2 Rule Updates #31524other
  • SRF3 Three Updates to SRF Rules #31523weight
  • SRF3 SRF Wet Tires #30849tyres & wheels
  • SRF3 SADEV-SRF3 Transmission #30926other
  • SRF3 SRF Update Maintenance, Repairs and Seals #30961engine
  • FE FE Tire Rule Changes #30754tyres & wheels
  • FE Radiator Screens Clarification #30792wording
  • FE FE Radiator Screens #30575other
  • SRF3 SRF3 Alternator Pulley #30684weight
  • SRF3 Mandatory identification: #30223engine
  • FE FE / FE2 Spring Updates #29689suspension & brakes
  • SRF3 SRF Shocks, Springs and Ride Height. #29688suspension & brakes
  • FE FE Gurney Flap Spec Update #29445aero
  • FE FE Gurney flap wicker clarification #28885aero
  • SRF3 SRF Shocks #28791suspension & brakes
  • FE FE spring rule update changed to November 1, 2020 #28814suspension & brakes
  • SRF3 Update Bump Stop Rule #28712suspension & brakes
  • SRF3 SRF Bump Stop Correction #27019suspension & brakes
  • FE Request for FE / FE2 preparation rules update #27722weight
  • SRF3 SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • FE FE / FE2 Update Rules #27624weight
  • SRF3 SRF Tire Warmer Rule #27622tyres & wheels
  • SRF3 SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF3 SRF / SRF3 Majors & Regional Class Updates #27723other
  • FE FE Wet Tire E&O #27365tyres & wheels
  • FE FE Tire Update #27029tyres & wheels
  • SRF3 SRF Dash Windscreen Kit #27028other
  • FE FE Anti-Roll Bar Clarification #26912suspension & brakes
  • FE FE / FE2 Updated Bubble Tail Rule #26913other
  • SRF3 New SRF Sectional Nose Rule Addition #26914other
  • SRF3 SRF Brakes and Shock Rule Changes #26629suspension & brakes
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.