BoP Lab / Buttonwillow Raceway Park

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

Quickest here: FE 1:49.749 Jeff Read, Hoosier SCCA Super Tour (Cal Club Region) qualifying · FX 1:48.518 Bill Weaver, Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park race

Lap times% of FE

FEFBF5FXsolid race · dashed qualifying · slower is lower

FEFBF5FXsolid 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

	Event	FE			FB					F5					FX
	Event	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
	Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park 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 cars added · 2 tyres & wheels · 2 weight · 1 engine · 1 induction · 1 wording · Pro Formula F 2000 Tube Frame engine now must follow current FC rules with restricted ECU map, cams, and air restrictor required. · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced from 29mm to 28mm Flat Plate Intake. · FE2 class created for 2.0L MZR engine at 1250 lbs minimum; FE 2.3L becomes Regional only through 2019 Runoffs. · FE and FE2 minimum weight increased to 1270 lbs including driver; spring options and tire warmer ban added. · FE wet tire rear width increases from 7.5 to 8.0 inches, Hoosier 44196 W3. · F500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 (03-13) minimum weight increases from 875 to 900 lbs. · FE removes American Racer tires, mandates Hoosier dry 22.0 x 8.0-13 FE front and 22.0 x 10.0-13 FE rear. · FE anti-roll bars may run disconnected; one link removable front, rear, or both for safety. · FE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes.showhide 2020-02-01 FX Change to FX Table 1 #28322engineslowerPro Formula F 2000 Tube Frame engine now must follow current FC rules with restricted ECU map, cams, and air restrictor required. 2020-01-01 F5 Change 600cc restrictor size #27883inductionslowerF500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced from 29mm to 28mm Flat Plate Intake. 2020-01-01 FE Request for FE / FE2 preparation rules update #27722cars addedcars addedFE2 class created for 2.0L MZR engine at 1250 lbs minimum; FE 2.3L becomes Regional only through 2019 Runoffs. 2019-12-01 FE FE / FE2 Update Rules #27624weightslowerFE and FE2 minimum weight increased to 1270 lbs including driver; spring options and tire warmer ban added. 2019-10-01 FE FE Wet Tire E&O #27365tyres & wheelsfasterFE wet tire rear width increases from 7.5 to 8.0 inches, Hoosier 44196 W3. 2019-08-31 F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbsslowerF500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 (03-13) minimum weight increases from 875 to 900 lbs. 2019-07-01 FE FE Tire Update #27029tyres & wheelsunclearFE removes American Racer tires, mandates Hoosier dry 22.0 x 8.0-13 FE front and 22.0 x 10.0-13 FE rear. 2019-05-31 FE FE Anti-Roll Bar Clarification #26912wordingwordingFE anti-roll bars may run disconnected; one link removable front, rear, or both for safety. 2019-05-31 FE FE / FE2 Updated Bubble Tail Rule #26913cars addedcars addedFE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes.
	Hoosier SCCA Super Tour (Cal Club Region) ST19APR262019-04-26	1:49.749Jeff Read · only car	1:50.132Jeff Read · fastest of 2	119.6Joe Reppert
1 earlier rule change on record, in force before Hoosier SCCA Super Tour (Cal Club Region) (from 2019)1 wording · FE wet tires updated: front Hoosier 44195 W3 and rear 44217 W3, WET designation removed.showhide 2019-03-01 FE Request to Update Hoosier Rain Tire Part Number for the FE cars #26235wordingwordingFE wet tires updated: front Hoosier 44195 W3 and rear 44217 W3, WET designation removed.

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.