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BoP Lab / Buttonwillow Raceway Park

F5 vs SRF vs FB vs FX pace at Buttonwillow Raceway Park

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
ASB SpecB-SpecBSpcEPF5×F6F500FAvsFB×FCFEFE 2FE2FFFMFPFVvsFX×GT1GT2GT3GT3UGTLGTXHPPP1P2PXSMSMXvsSRF×SRF3STLSTUT1T2T3T4
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
Track configuration

Quickest here: F5 1:51.129 Jeff Jorgenson, Super Tour Apr 2017 race · SRF 1:44.060 Vince Balch, Super Tour Apr 2017 qualifying · FB 1:38.870 Gary Hickman, Super Tour Apr 2018 race · FX 1:48.518 Bill Weaver, Super Tour Feb 2020 race

1:401:451:501:552:008 rule changes between Super Tour Apr 2018 and Super Tour Feb 20208 ▾F5 race best at Super Tour Apr 2017: 1:51.129 (Jeff Jorgenson)F5 qualifying best at Super Tour Apr 2017: 1:52.268 (Jeff Jorgenson)SRF race best at Super Tour Apr 2017: 2:01.122 (Mike Miserendino)SRF qualifying best at Super Tour Apr 2017: 1:44.060 (Vince Balch)FB race best at Super Tour Apr 2017: 1:40.111 (Gary Hickman)FB race best at Super Tour Apr 2018: 1:38.870 (Gary Hickman)FB qualifying best at Super Tour Apr 2017: 1:42.272 (John LaBrie)FB qualifying best at Super Tour Apr 2018: 1:39.142 (Gary Hickman)FX race best at Super Tour Feb 2020: 1:48.518 (Bill Weaver)FX qualifying best at Super Tour Feb 2020: 1:49.320 (Steve Martin)Super Tour Apr 20172017Super Tour Apr 20182018Super Tour Feb 20202020
F5SRFFBFXsolid race · dashed qualifying · slower is lower
88%90%92%94%96%98%100%102%104%106%108%110%8 rule changes between Super Tour Apr 2018 and Super Tour Feb 20208 ▾F5 race best at Super Tour Apr 2017: 100.0% of F5's (Jeff Jorgenson)F5 qualifying best at Super Tour Apr 2017: 100.0% of F5's (Jeff Jorgenson)SRF race best at Super Tour Apr 2017: 109.0% of F5's (Mike Miserendino)SRF qualifying best at Super Tour Apr 2017: 92.7% of F5's (Vince Balch)FB race best at Super Tour Apr 2017: 90.1% of F5's (Gary Hickman)FB qualifying best at Super Tour Apr 2017: 91.1% of F5's (John LaBrie)Super Tour Apr 20172017Super Tour Apr 20182018Super Tour Feb 20202020
F5SRFFBFXsolid race · dashed qualifying · each class's best lap as a share of F5's at the same event (the reference class, changeable above); 100% is level, higher is quicker
EventF5SRFFBFX
Qual bestRace bestTrapQual bestRace bestTrapvs F5% of F5Qual bestRace bestTrapvs F5% of F5Qual bestRace bestTrapvs F5% of F5
Super Tour Feb 2020 ST20FEB212020-02-211:49.320Steve Martin · fastest of 5 · top 5 within 6.7s1:48.518Bill Weaver · fastest of 5 · top 5 within 6.8s129.9Steve Martin
8 rule changes (F5: 2, SRF: 5, FX: 1)2 induction · 2 weight · 1 suspension & brakes · 1 tyres & wheels · 2 other · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced to 28mm from 29mm. · F500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 minimum weights increase to 900 lbs.showhide
  • FX Change to FX Table 1 #28322induction
  • F5 Change 600cc restrictor size #27883inductionslower · inductionF500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced to 28mm from 29mm.
  • SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • SRF SRF Tire Warmer Rule #27622tyres & wheels
  • SRF SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF SRF / SRF3 Majors & Regional Class Updates #27723other
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbsslower · weightF500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 minimum weights increase to 900 lbs.
  • SRF SRF Dash Windscreen Kit #27028other
Super Tour Apr 2018 BUTTRA182018-04-271:39.142Gary Hickman · fastest of 2-3.130s (-3.06%)1:38.870Gary Hickman · fastest of 2-1.241s (-1.24%)
No rule changes on record between these events
Super Tour Apr 2017 BUTTRA172017-04-281:52.268Jeff Jorgenson · fastest of 21:51.129Jeff Jorgenson · fastest of 21:44.060Vince Balch · fastest of 8 · top 5 within 18.6s2:01.122Mike Miserendino · fastest of 7 · top 5 within 1.8s+9.993squal -8.208s109.0%qual 92.7%1:42.272John LaBrie · fastest of 21:40.111Gary Hickman · fastest of 2-11.018squal -9.996s90.1%qual 91.1%

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 F5" is the class's best as a share of F5'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 F5'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.