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BoP Lab / Buttonwillow Raceway Park

F500 vs F5 vs FB vs SMX pace at Buttonwillow Raceway Park

F500 at every track →
Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
Reference · what % is measured against, 2 events
Track configuration

Quickest here: SMX 1:56.431 Ethan Lampe, Super Tour Feb 2025 qualifying

1:561:571:584 rule changes between Super Tour Feb 2025 and Super Tour Feb 20264 ▾SMX race best at Super Tour Feb 2025: 1:57.417 (Ethan Lampe)SMX race best at Super Tour Feb 2026: 1:57.973 (William Wallis)SMX qualifying best at Super Tour Feb 2025: 1:56.431 (Ethan Lampe)SMX qualifying best at Super Tour Feb 2026: 1:56.503 (Lincoln Larson)Super Tour Feb 2025Super Tour Feb2025Super Tour Feb 2026Super Tour Feb2026
F500F5FBSMXsolid race · dashed qualifying · slower is lower
EventF500F5FBSMX
Qual best Race best Trap Qual best Race best Trap vs F500 Qual best Race best Trap vs F500 Qual best Race best Trap vs F500 
Super Tour Feb 2026 CALCL262026-02-211:56.503Lincoln Larson · fastest of 15 · top 5 within 0.7s+0.072s (+0.06%)1:57.973William Wallis · fastest of 15 · top 5 within 0.8s+0.556s (+0.47%)141.6Joey Andrews+28.0 mph (+24.6%)
4 rule changes (SMX: 4)1 tyres & wheels · 1 wording · 2 othershowhide
  • SMX SMX Data Submission - Penalties #38248other
  • SMX SMX Penaly Clarification updated language #38337wording
  • SMX Clarify Tire Marking Regs #38004tyres & wheels
  • SMX SMX Data Submission Timeframe #38039other
Super Tour Feb 2025 CALCL252025-02-221:56.431Ethan Lampe · fastest of 15 · top 5 within 1.5s1:57.417Ethan Lampe · fastest of 15 · top 5 within 1.6s113.6Ryan Gutile
21 earlier rule changes on record, in force before Super Tour Feb 2025 (from 2019)6 engine · 3 induction · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 2 wording · 7 othershowhide
  • SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • SMX SMX Camera Rule Correction #36496wording
  • SMX AIM ECU Protocol #36556engine
  • SMX OE versus OEM Definitons #36608other
  • SMX Shifter Bushing #36611suspension & brakes
  • F5 Intake Boots Correction #33028induction
  • 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
  • F5 E&O class name #32194other
  • F5 Data Box Mounting Plate #31638other
  • F5 Clarify allowable assisted shifting systems #30871wording
  • F5 Request to correct terminology #30976tyres & wheels
  • F5 Request to Allow Rotax 593 HO Engine #30712engine
  • F5 Request to Update Suzuki Engine Years for F500 #29453engine
  • 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
  • F5 Change 600cc restrictor size #27883induction
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs
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.