BoP Lab / Buttonwillow Raceway Park
FE vs FM vs F5 vs FX pace at Buttonwillow Raceway Park
Quickest here: FE 1:47.040 Brandon Chappell, Super Tour Apr 2018 race · FM 1:45.954 Mike Anderson, Super Tour Apr 2018 race · F5 1:51.129 Jeff Jorgenson, Super Tour Apr 2017 race · FX 1:48.518 Bill Weaver, Super Tour Feb 2020 race
| Event | FE | FM | F5 | FX | ||||||||||||||||
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs FE | % of FE | Qual best | Race best | Trap | vs FE | % of FE | Qual best | Race best | Trap | vs FE | % of FE | |||
| Super Tour Feb 2022 CALCL222022-02-17 | 1:48.641Max Parker · fastest of 3 · top 3 within 5.1s-0.679s (-0.62%) | 1:49.461Max Parker · fastest of 3 · top 3 within 4.6s+0.943s (+0.87%) | 117.4Terrance Carraher-12.5 mph (-9.6%) | |||||||||||||||||
31 rule changes (FE: 8, F5: 9, FX: 14)7 cars added · 4 tyres & wheels · 2 aero · 2 engine · 1 suspension & brakes · 12 wording · 3 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. · 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. · 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. · FE front springs change to 800 lbs Hypercoil WM203013 Silver; rear to 900 lbs Hypercoil WM203014 Silver. · 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. · FE Gurney flaps clarified: front wing secondary only at 0.500" ±0.030", rear wing at 0.250" ±0.030". · 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. · 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. · 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 | |||||||||||||||||
9 rule changes (FE: 6, F5: 2, FX: 1)2 tyres & wheels · 2 weight · 1 aero · 1 cars added · 1 induction · 1 suspension & brakes · 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. · 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 | 1:49.608Mike Anderson · fastest of 3 · top 3 within 5.6s+3.285s (+3.09%) | 1:49.409Mike Anderson · fastest of 3 · top 3 within 4.9s+3.455s (+3.26%) | 121.2Mike Anderson | -0.723squal -0.141s | 99.3%qual 99.9% | ||||||||||||
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%) | 1:46.323Mike Anderson · fastest of 9 · top 5 within 2.1s+0.367s (+0.35%) | 1:45.954Mike Anderson · fastest of 9 · top 5 within 3.3s-0.317s (-0.30%) | -1.086squal -1.273s | 99.0%qual 98.8% | ||||||||||||||
| No rule changes on record between these events | ||||||||||||||||||||
| Super Tour Apr 2017 BUTTRA172017-04-28 | 1:48.750Brandon Aleckson · fastest of 2 | 1:48.199Brandon Aleckson · fastest of 2 | 1:45.956Mike Anderson · fastest of 8 · top 5 within 2.0s | 1:46.271Mike Anderson · fastest of 10 · top 5 within 2.1s | -1.928squal -2.794s | 98.2%qual 97.4% | 1:52.268Jeff Jorgenson · fastest of 2 | 1:51.129Jeff Jorgenson · fastest of 2 | +2.930squal +3.518s | 102.7%qual 103.2% | ||||||||||
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 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.