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BoP Lab / Buttonwillow Raceway Park

FE vs F5 vs SRF 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-SpecBSpcEPvsF5×F6F500FAFBFCFE×FE 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: FE 1:47.040 Brandon Chappell, Super Tour Apr 2018 race · F5 1:51.129 Jeff Jorgenson, Super Tour Apr 2017 race · SRF 1:44.060 Vince Balch, Super Tour Apr 2017 qualifying · FX 1:48.518 Bill Weaver, Super Tour Feb 2020 race

1:451:501:552:001 rule change between Super Tour Apr 2018 and Super Tour Apr 20191 ▾14 rule changes between Super Tour Apr 2019 and Super Tour Feb 202014 ▾FE race best at Super Tour Apr 2017: 1:48.199 (Brandon Aleckson)FE race best at Super Tour Apr 2018: 1:47.040 (Brandon Chappell)FE race best at Super Tour Apr 2019: 1:50.132 (Jeff Read)FE qualifying best at Super Tour Apr 2017: 1:48.750 (Brandon Aleckson)FE qualifying best at Super Tour Apr 2018: 1:47.596 (John Yeatman)FE qualifying best at Super Tour Apr 2019: 1:49.749 (Jeff Read)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)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 Apr 20192019Super Tour Feb 20202020
FEF5SRFFXsolid race · dashed qualifying · slower is lower
94%96%98%100%102%104%106%108%110%112%1 rule change between Super Tour Apr 2018 and Super Tour Apr 20191 ▾14 rule changes between Super Tour Apr 2019 and Super Tour Feb 202014 ▾FE race best at Super Tour Apr 2017: 100.0% of FE's (Brandon Aleckson)FE race best at Super Tour Apr 2018: 100.0% of FE's (Brandon Chappell)FE race best at Super Tour Apr 2019: 100.0% of FE's (Jeff Read)FE qualifying best at Super Tour Apr 2017: 100.0% of FE's (Brandon Aleckson)FE qualifying best at Super Tour Apr 2018: 100.0% of FE's (John Yeatman)FE qualifying best at Super Tour Apr 2019: 100.0% of FE's (Jeff Read)F5 race best at Super Tour Apr 2017: 102.7% of FE's (Jeff Jorgenson)F5 qualifying best at Super Tour Apr 2017: 103.2% of FE's (Jeff Jorgenson)SRF race best at Super Tour Apr 2017: 111.9% of FE's (Mike Miserendino)SRF qualifying best at Super Tour Apr 2017: 95.7% of FE's (Vince Balch)Super Tour Apr 20172017Super Tour Apr 20182018Super Tour Apr 20192019Super Tour Feb 20202020
FEF5SRFFXsolid race · dashed qualifying · each class's best lap as a share of FE's at the same event (the reference class, changeable above); 100% is level, higher is quicker
EventFEF5SRFFX
Qual bestRace bestTrapQual bestRace bestTrapvs FE% of FEQual bestRace bestTrapvs FE% of FEQual bestRace bestTrapvs FE% of FE
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
14 rule changes (FE: 6, F5: 2, SRF: 5, FX: 1)4 weight · 3 tyres & wheels · 2 induction · 2 suspension & brakes · 3 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.
  • FE Request for FE / FE2 preparation rules update #27722weight
  • SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes
  • FE FE / FE2 Update Rules #27624weight
  • SRF SRF Tire Warmer Rule #27622tyres & wheels
  • SRF SRF / SRF3 Nose Weight Reduction #27706weight
  • SRF SRF / SRF3 Majors & Regional Class Updates #27723other
  • FE FE Wet Tire E&O #27365tyres & wheels
  • 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.
  • FE FE Tire Update #27029tyres & wheels
  • SRF SRF Dash Windscreen Kit #27028other
  • FE FE Anti-Roll Bar Clarification #26912suspension & brakes
  • FE FE / FE2 Updated Bubble Tail Rule #26913other
Super Tour Apr 2019 ST19APR262019-04-261:49.749Jeff Read · only car+2.153s (+2.00%)1:50.132Jeff Read · fastest of 2+3.092s (+2.89%)119.6Joe Reppert
1 rule change (FE: 1)1 tyres & wheelsshowhide
  • FE Request to Update Hoosier Rain Tire Part Number for the FE cars #26235tyres & wheels
Super Tour Apr 2018 BUTTRA182018-04-271:47.596John Yeatman · fastest of 3 · top 3 within 13.1s-1.154s (-1.06%)1:47.040Brandon Chappell · fastest of 3 · top 3 within 11.2s-1.159s (-1.07%)
No rule changes on record between these events
Super Tour Apr 2017 BUTTRA172017-04-281:48.750Brandon Aleckson · fastest of 21:48.199Brandon Aleckson · fastest of 21:52.268Jeff Jorgenson · fastest of 21:51.129Jeff Jorgenson · fastest of 2+2.930squal +3.518s102.7%qual 103.2%1:44.060Vince Balch · fastest of 8 · top 5 within 18.6s2:01.122Mike Miserendino · fastest of 7 · top 5 within 1.8s+12.923squal -4.690s111.9%qual 95.7%

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.