BoP Lab / Buttonwillow Raceway Park
F6 vs F5 vs FE vs FB pace at Buttonwillow Raceway Park
Lap times across years say as much about the weather as the class. % of F6 is each class's best lap as a share of F6's on the same day, so the conditions drop out: 100% is level, less is quicker, and a move in it is the class getting faster or slower against the field.
Quickest here: F6 1:59.670 Jeff Jorgenson, Super Tour Feb 2024 race · F5 1:51.129 Jeff Jorgenson, Super Tour Apr 2017 race · FE 1:47.040 Brandon Chappell, Super Tour Apr 2018 race · FB 1:38.870 Gary Hickman, Super Tour Apr 2018 race
| Event | F6 | F5 | FE | FB | ||||||||||||||||
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs F6 | % of F6 | Qual best | Race best | Trap | vs F6 | % of F6 | Qual best | Race best | Trap | vs F6 | % of F6 | |||
| Super Tour Feb 2024 CALCL242024-02-23 | 2:00.926Jeff Jorgenson · only car | 1:59.670Jeff Jorgenson · only car | 104.7Jeff Jorgenson | |||||||||||||||||
38 rule changes (F5: 16, FE: 22)3 aero · 3 engine · 3 suspension & brakes · 2 cars added · 2 tyres & wheels · 2 weight · 1 induction · 18 wording · 4 other · 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. · FE SADEV transmission rule removes note that all ratios under review and could be updated prior to sealing. · FE drivers may now adjust brake bias manually during the race. · FE front and rear wing specifications clarified: adjustment ranges, shimming, Gurney flap sizes, mounting hardware, and measurement references refined. · F500 Rotax 493 and 593 intake boots: removed Moto Tassinari V3124-873B-2 from 493/593 non-HO allowance, added Moto Tassinari V3120-794A-2 option for non-HO. · FE engine heat shield and insulation between block and exhaust now permitted to protect fuel cell, filter, rail, lines. · F500 Rotax engines now permit Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU. · F500 clarifies stepped diameter exhaust headers prohibited except at cylinder head flange area. · F500 Rotax 593 intake boot options clarified; oil injection pump removal now permitted. · FE tires must be run as delivered in sets of 4. · FE master cylinders clarified: Girling front .700" piston WM802005, rear .750" piston WM802006. · F500 Majors and Runoffs cars must install AIM part #X47KPFSOLO2R0 data box mount for Solo or Solo 2. · F5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors and Runoffs. · F5 clarifies mechanical shifting only; throttle-cut and flat-shifter devices permitted if driver retains full control. · F5 single-seat open-wheel cars: rigid suspension becomes limited suspension in class definition. · FE removes qualifying tire marking requirements and rain tire set rules; renumbers tire warmer prohibition. · FE radiator screens may not protrude more than ¼ inch in front of the outside vertical plane of the sidepods. · F500 Rotax 593 HO engine now permitted; 875 lbs minimum weight, MA0242SP1020A or MA0242SP1063A restrictor, specific intake boots and piston required. · FE radiator screens now allowed, maximum ¼ inch from sidepod front vertical plane. · FE front springs change to 800 lbs Hypercoil WM203013 Silver; rear to 900 lbs Hypercoil WM203014 Silver. · F500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. · FE Gurney flaps clarified: front wing secondary only at 0.500" ±0.030", rear wing at 0.250" ±0.030". · F5 request to adjust external jetting device cockpit control denied; no rule change made. · F5 driver adjustable carburettor mixture: refer to separate Fastrack letter #28359 for ruling. · F5 cockpit adjustment request response published in Fastrack letter 28359. · FE Gurney flap wicker bill clarified: permitted on front wing secondary elements only, not main plane. · FE2 and FE spring part numbers WM203013 front and WM203014 rear required date moved to November 1, 2020. · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced to 28mm from 29mm. · FE2 Mazda 2.0L MZR engine now permitted in all SCCA events at 1250 lbs minimum; FE 2.3L becomes Regional Only through 2019 Runoffs. · FE minimum weight rises to 1270 lbs; FE2 minimum weight rises to 1270 lbs; new spring options added; tire warmers prohibited. · FE Hoosier wet rear tire width increases from 7.5 to 8.0 inches, part number 44196 W3. · F500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 minimum weights increase to 900 lbs. · FE removes American Racer tires, mandates Hoosier dry tires 22.0 X 8.0-13 and 22.0 X 10.0-13, wet tires 22.0 X 7.5-13 and 22.0 X 9.0-13. · FE anti-roll bar links may be removed one per end for safety, but bars must stay connected. · FE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes.show
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| Super Tour Apr 2019 ST19APR262019-04-26 | 1:49.749Jeff 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 & wheels · FE Hoosier rain tyre part numbers updated: front 44195 W3, rear 44217 W3.show
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| Super Tour Apr 2018 BUTTRA182018-04-27 | 1:47.596John 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%) | 1:39.142Gary 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 BUTTRA172017-04-28 | 1:52.268Jeff Jorgenson · fastest of 2 | 1:51.129Jeff Jorgenson · fastest of 2 | 1:48.750Brandon Aleckson · fastest of 2 | 1:48.199Brandon Aleckson · fastest of 2 | 1:42.272John LaBrie · fastest of 2 | 1:40.111Gary Hickman · fastest of 2 | ||||||||||||||
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. "% of F6" is the class's best as a share of F6'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 F6'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.