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BoP Lab / Buttonwillow Raceway Park

F5 vs FM vs FE vs FE2 pace at Buttonwillow Raceway Park

F5 at every track →
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Reference · what % is measured against
Track configuration

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

1:101:201:301:4037 rule changes between Super Tour Apr 2019 and Super Tour Feb 202337 ▾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
F5FMFEFE2solid race · dashed qualifying · slower is lower
EventF5FMFEFE2
Qual best Race best Trap Qual best Race best Trap vs F5 Qual best Race best Trap vs F5 Qual best Race best Trap vs F5 
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)2 cars added · 2 wording · 1 other · FE adds engine modification restrictions, testing requirements, and drivetrain violation penalties with competition suspension. · FE and FE2 Enterprise bubble tail part WM138014 now allowed; FE2 must use this configuration only. · FE and FE2 Enterprise bubble tail part WM138014 now allowed; FE2 must use this configuration only. · FE2 minimum weight stays 1270 lbs; intake manifold part number changes to WM301061; ECU to G992012; mandatory spec parts expanded; bubble tail WM138014 now FE only; SADEV transmission no modifications allowed; brake rotor part numbers to W… · FE2 allows pre-approved driver safety and comfort seat and control modifications for drivers with disabilities, per logbook.showhide
  • FE FE & FE2 Rule Updates #39484wordingwordingFE adds engine modification restrictions, testing requirements, and drivetrain violation penalties with competition suspension.
  • FE FE & FE2 Bubble Tail #38978cars addedaddedFE and FE2 Enterprise bubble tail part WM138014 now allowed; FE2 must use this configuration only.
  • FE2 FE & FE2 Bubble Tail #38978cars addedaddedFE and FE2 Enterprise bubble tail part WM138014 now allowed; FE2 must use this configuration only.
  • FE FE & FE2 Rule Updates #38901wordingwordingFE2 minimum weight stays 1270 lbs; intake manifold part number changes to WM301061; ECU to G992012; mandatory spec parts expanded; bubble tail WM138014 now FE only; SADEV transmission no modifications allowed; brake rotor part numbers to W…
  • FE2 Driver Safety & Comfort #37965otheraddedFE2 allows pre-approved driver safety and comfort seat and control modifications for drivers with disabilities, per logbook.
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)5 wording · 2 other · FE must use SCCA Part # WM803010 Brake Line to Control Arm covers if used, as delivered, fastened with zip ties or tape only. · FE and SRF protest fee rules redirected to GCR section 8.3.1.D for fees and procedure. · FE Hoosier contingency decal requirement reduced from five decals in specific locations to three decals on sides and front. · FE requires five Hoosier decals: one small on nose or front shock cover, one 12" on each front wing plate, one 12" on each lower floor panel before rear wheels. · FE rain light now must meet FIA Standard 8874-2019, Technical List No. 76, effective 1/1/2024. · FE allows racer's tape for crash repair, panel security, and heat exchanger opening control; seam taping banned.showhide
  • FE Brake Line to A-Arm Covers #37110otheraddedFE must use SCCA Part # WM803010 Brake Line to Control Arm covers if used, as delivered, fastened with zip ties or tape only.
  • FE Protest Fee Clarification #36540wordingwordingFE and SRF protest fee rules redirected to GCR section 8.3.1.D for fees and procedure.
  • FE Update on Letter 36620 with new Hoosier Contingency Decal Info #36625wordingwordingFE Hoosier contingency decal requirement reduced from five decals in specific locations to three decals on sides and front.
  • FE Hoosier Tire Decal Placement #36435wordingaddedFE requires five Hoosier decals: one small on nose or front shock cover, one 12" on each front wing plate, one 12" on each lower floor panel before rear wheels.
  • FE Update FE Rain Light Rule #34707wordingwordingFE rain light now must meet FIA Standard 8874-2019, Technical List No. 76, effective 1/1/2024.
  • FE FE/FE2 rule update #35269wordingwordingFE allows racer's tape for crash repair, panel security, and heat exchanger opening control; seam taping banned.
  • 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
37 rule changes (F5: 16, FE: 19, FE2: 2)7 engine · 5 tyres & wheels · 4 suspension & brakes · 4 weight · 3 aero · 3 induction · 3 wording · 8 othershowhide
  • FE Brake bias adjuster clarification #33084suspension & brakes
  • FE FE Front and Rear Wing Update & Clarification #33089aero
  • F5 Intake Boots Correction #33028induction
  • FE Engine Heat Shield & Insulation #33019engine
  • F5 Ensure availability of ECU for Rotax engines #32695engine
  • F5 Clarify stepped exhaust header references #32743engine
  • F5 593 carb boot availability and oil pump clarification #32527induction
  • FE Update FE/FE2 Tire Rule #32613tyres & wheels
  • FE Master cylinder clarification #32669engine
  • F5 E&O class name #32194other
  • F5 Data Box Mounting Plate #31638other
  • FE Two FE2 Rule Updates #31524other
  • F5 Clarify allowable assisted shifting systems #30871wording
  • F5 Request to correct terminology #30976tyres & wheels
  • FE FE Tire Rule Changes #30754tyres & wheels
  • FE Radiator Screens Clarification #30792wording
  • F5 Request to Allow Rotax 593 HO Engine #30712engine
  • FE FE Radiator Screens #30575other
  • FE FE / FE2 Spring Updates #29689suspension & brakes
  • F5 Request to Update Suzuki Engine Years for F500 #29453engine
  • FE FE Gurney Flap Spec Update #29445aero
  • FE2 FE/FE2 Oil Cooler #29293wording
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359other
  • F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine
  • F5 Re letter requesting driver adjustable carb mixture #28840other
  • F5 #28359 WDYT Request for Cockpit Adjustment #28875other
  • FE FE Gurney flap wicker clarification #28885aero
  • FE FE spring rule update changed to November 1, 2020 #28814suspension & brakes
  • F5 Change 600cc restrictor size #27883induction
  • 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
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs
  • 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. 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.