BoP Lab / Buttonwillow Raceway Park
F5 vs F6 vs FX pace at Buttonwillow Raceway Park
Lap times across years say as much about the weather as the class. % of F5 is each class's best lap as a share of F5'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: F5 1:51.129 Jeff Jorgenson, Super Tour Apr 2017 race · F6 1:59.670 Jeff Jorgenson, Super Tour Feb 2024 race · FX 1:48.518 Bill Weaver, Super Tour Feb 2020 race
| Event | F5 | F6 | FX | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Qual best | Race best | Trap | Qual best | Race best | Trap | vs F5 | % of F5 | Qual best | Race best | Trap | vs F5 | % of F5 | |||
| Super Tour Feb 2024 CALCL242024-02-23 | 2:00.926Jeff Jorgenson · only car | 1:59.670Jeff Jorgenson · only car | 104.7Jeff Jorgenson | ||||||||||||
14 rule changes (F5: 5, FX: 9)3 cars added · 2 engine · 2 weight · 1 induction · 4 wording · 2 other · FX Formula Mazda specifications updated; attached table not provided. · USF2000 Van Diemen with Mazda MZR LF-DE 2.0L added to FC as spec line car; removed from FX. · FX: Remove FB and FM from combined-class preferences in GCR 1.4.2.D. · Formula Renault 2.0 (10-17) reclassified from FX to FA spec line; minimum weight reduced 1300 to 1280 lbs, restrictor removed. · 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. · F500 Rotax engines now permit Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU. · Pro Formula F2000 tube frame transmission cut to 4 forward gears; sequential carries 25 lb. weight penalty. · FX Formula Mazda minimum weight set to 1270 lb. · FX Formula Mazda drops four-port Renesis engine option; weight minimum now per notes. · F500 clarifies stepped diameter exhaust headers prohibited except at cylinder head flange area. · Formula Renault 2.0 (10-17) now requires 45mm Flat Plate Intake Restrictor; fairings before or after prohibited. · USF2000 Tube Frame adds Performance Electronics PE3-8400 ECU as alternative to Pectel T2. · F500 Rotax 593 intake boot options clarified; oil injection pump removal now permitted. · F500 Majors and Runoffs cars must install AIM part #X47KPFSOLO2R0 data box mount for Solo or Solo 2.show
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| Super Tour Feb 2022 CALCL222022-02-17 | 1:48.641Max Parker · fastest of 3 · top 3 within 5.1s-0.679s (-0.62%) | 1:50.238Max Parker · fastest of 3 · top 3 within 3.9s+1.720s (+1.58%) | 117.4Terrance Carraher-12.5 mph (-9.6%) | ||||||||||||
23 rule changes (F5: 9, FX: 14)7 cars added · 4 tyres & wheels · 2 engine · 8 wording · 2 other · Formula Mazda FX rule reference updated to current specifications document; tire marking no longer required. · FX Formula 4 tire choice unrestricted; must provide FIA certification rules upon request. · FX USF2000 Tube Frame front tyre changes from Hoosier radial 20.5 x 7.0 x 13 to any Hoosier 20.5 x 7.0 x 13. · FX Formula Renault 2.0 (00-09) and (10-17) tire choice unrestricted; no other component alterations except repairs. · 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. · FX USF2000 Tube Frame gains Hoosier radial tyre option, FC-compliant shocks, Wilwood brakes, and Bosch spark plugs. · F500 Rotax 593 HO engine now permitted; 875 lbs minimum weight, MA0242SP1020A or MA0242SP1063A restrictor, specific intake boots and piston required. · FX USF2000 Tube Frame now allows any Hoosier radial tire 20.5×7.0×13 front, 22.5×8.0×13 rear. · Formula Renault 2.0 / Fran-Am 2000 added to FX class at 1250 lbs with 8-inch front, 10-inch rear wheels, sealed engine. · FX adds 2010–2017 Formula Renault 2.0, must comply with Table 1 notes. · FX FormulaSPEED FS2.0 now references online specifications instead of requiring World Speed Inc. documentation by April 2020. · F500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. · Formula Ireland / Formula FX added to FX class, must comply with Table 1 notes. · 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. · Formula Ireland/Formula FX cars pending specification submission for possible FX table addition. · Ex-Pro Formula Super Vee added to FX with 1600cc VW engine, 1190 lb minimum weight, 6-inch front and 8-inch rear wheels. · FormulaSPEED with 2.0L Mazda MZR engine, 8in front/10in rear wheels, adjustable dual rear planes, 1350 lbs moves from FA to FX. · FX Formula Mazda no longer requires tire marking; must comply with December 2019 GCR rules.show
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| Super Tour Feb 2020 ST20FEB212020-02-21 | 1:49.320Steve Martin · fastest of 5 · top 5 within 6.7s | 1:48.518Bill Weaver · fastest of 5 · top 5 within 6.8s | 129.9Steve Martin | ||||||||||||
3 rule changes (F5: 2, FX: 1)1 induction · 1 weight · 1 wording · Pro Formula F 2000 and USF2000 Tube Frame engine and car rules simplified; FC rules and FRP MAZDA MZR F2000 specs now apply directly. · 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.show
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| Super Tour Apr 2017 BUTTRA172017-04-28 | 1:52.268Jeff Jorgenson · fastest of 2 | 1:51.129Jeff Jorgenson · 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 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.