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BoP Lab / Buttonwillow Raceway Park

F500 vs F5 pace at Buttonwillow Raceway Park

Class · click a class to switch, + to compare alongside (up to 4)
AS+B Spec+B-Spec+BSpc+EP+vsF5×F6+F500×FA+FB+FC+FE+FE 2+FE2+FF+FM+FP+FV+FX+GT1+GT2+GT3+GT3U+GTL+GTX+HP+P+P1+P2+PX+SM+SMX+SRF+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

Quickest here: F500 1:58.561 Lance Spiering, Cal Club 2022 race · F5 1:51.129 Jeff Jorgenson, Buttonwillow Raceway Park 2017 race

1:501:521:541:561:582:002:022:0411 rule changes between Buttonwillow Raceway Park 2017 and Cal Club 202211 ▾F500 race best at Cal Club 2022: 1:58.561 (Lance Spiering)F500 qualifying best at Cal Club 2022: 2:03.309 (Lance Spiering)F5 race best at Buttonwillow Raceway Park 2017: 1:51.129 (Jeff Jorgenson)F5 qualifying best at Buttonwillow Raceway Park 2017: 1:52.268 (Jeff Jorgenson)Buttonwillow Raceway Park 20172017Cal Club 20222022
F500F5solid race · dashed qualifying · slower is lower
100%11 rule changes between Buttonwillow Raceway Park 2017 and Cal Club 202211 ▾F500 race best at Cal Club 2022: 100.0% of F500's (Lance Spiering)F500 qualifying best at Cal Club 2022: 100.0% of F500's (Lance Spiering)Buttonwillow Raceway Park 20172017Cal Club 20222022
F500F5solid race · dashed qualifying · each class's best lap as a share of F500's at the same event (the reference class, changeable above); 100% is level, higher is quicker
EventF500F5
Qual bestRace bestTrapQual bestRace bestTrapvs F500% of F500
Cal Club 2022 CALCL222022-02-172:03.309Lance Spiering · only car1:58.561Lance Spiering · only car111.9Lance Spiering
11 rule changes (F5: 11)1 cars added · 1 engine · 1 induction · 1 weight · 5 wording · 2 other · F5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors Races and Runoffs. · F5 clarifies assisted shifting: mechanical only, no solenoids or air-shifters; throttle/ignition devices allowed if driver controls initiation. · F5 single-seat open-wheel cars: rigid suspension terminology changed to limited suspension. · F500 Rotax 593 HO engine added at 875 lbs with MA0242SP1020A or MA0242SP1063A restrictor. · F500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. · F5 request to adjust external jetting devices cockpit control denied by Club Racing Board. · Unable to summarize: letter references response in separate Fastrack document not provided. · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced from 29mm to 28mm Flat Plate Intake. · F500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 (03-13) minimum weight increases from 875 to 900 lbs.showhide
  • F5 Data Box Mounting Plate #31638otherotherF5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors Races and Runoffs.
  • F5 Clarify allowable assisted shifting systems #30871wordingwordingF5 clarifies assisted shifting: mechanical only, no solenoids or air-shifters; throttle/ignition devices allowed if driver controls initiation.
  • F5 Request to correct terminology #30976wordingwordingF5 single-seat open-wheel cars: rigid suspension terminology changed to limited suspension.
  • F5 Request to Allow Rotax 593 HO Engine #30712cars addedcars addedF500 Rotax 593 HO engine added at 875 lbs with MA0242SP1020A or MA0242SP1063A restrictor.
  • F5 Request to Update Suzuki Engine Years for F500 #29453wordingwordingF500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019.
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359wordingwordingF5 request to adjust external jetting devices cockpit control denied by Club Racing Board.
  • 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 #28875wordingunclearUnable to summarize: letter references response in separate Fastrack document not provided.
  • F5 Change 600cc restrictor size #27883inductionslowerF500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced from 29mm to 28mm Flat Plate Intake.
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbsslowerF500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 (03-13) minimum weight increases from 875 to 900 lbs.
Buttonwillow Raceway Park 2017 BUTTRA172017-04-281:52.268Jeff Jorgenson · fastest of 21:51.129Jeff Jorgenson · fastest of 2

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 F500" is the class's best as a share of F500'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 F500'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.