BoP Lab / Buttonwillow Raceway Park

FB vs SRF vs FM vs B Spec pace at Buttonwillow Raceway Park

Lap times across years say as much about the weather as the class. % of FB is each class's best lap as a share of FB'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: FB 1:38.870 Gary Hickman, Super Tour Apr 2018 race · SRF 1:44.060 Vince Balch, Super Tour Apr 2017 qualifying · FM 1:45.954 Mike Anderson, Super Tour Apr 2018 race · B Spec 2:16.080 Thomas Lepper, Super Tour Feb 2024 qualifying

% of FBLap times

FBSRFFMB Specsolid race · dashed qualifying · slower is lower

FBSRFFMB Specsolid race · dashed qualifying · each class's best lap as a share of FB's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	FB			SRF					FM					B Spec
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs FB	% of FB	Qual best	Race best	Trap	vs FB	% of FB	Qual best	Race best	Trap	vs FB	% of FB
	Super Tour Feb 2024 CALCL242024-02-23														2:16.080Thomas Lepper · fastest of 3 · top 3 within 2.3s		93.9Ali Naimi
22 rule changes (SRF: 22)7 suspension & brakes · 5 tyres & wheels · 4 weight · 2 engine · 4 othershowhide 2024-01-01 SRF Update SRF Rain / Brake Rule #34706suspension & brakes 2024-01-01 SRF Update SRF Brake Light Rule v1 #34853suspension & brakes 2024-01-01 SRF SRF / SRF3 Rule Updates #35268weight 2023-10-01 SRF SRF Radiator Rule Update #34805other 2023-06-01 SRF Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels 2023-05-01 SRF Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels 2023-03-01 SRF Update SRF Brake Rule #33469suspension & brakes 2022-06-01 SRF SRF Tire Rule Update #32614tyres & wheels 2022-06-01 SRF Brake, seal, and air filter clarifications #32670suspension & brakes 2021-12-01 SRF Three Updates to SRF Rules #31523weight 2021-08-01 SRF SRF Wet Tires #30849tyres & wheels 2021-08-01 SRF SADEV-SRF3 Transmission #30926other 2021-08-01 SRF SRF Update Maintenance, Repairs and Seals #30961engine 2021-06-01 SRF SRF3 Alternator Pulley #30684weight 2021-03-01 SRF Mandatory identification: #30223engine 2020-12-01 SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes 2020-05-01 SRF SRF Bump Stop Correction #27019suspension & brakes 202-01-01 SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes 2019-12-01 SRF SRF Tire Warmer Rule #27622tyres & wheels 2019-12-01 SRF SRF / SRF3 Nose Weight Reduction #27706weight 2019-12-01 SRF SRF / SRF3 Majors & Regional Class Updates #27723other 2019-07-01 SRF SRF Dash Windscreen Kit #27028other
	Super Tour Apr 2019 ST19APR262019-04-26									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
No rule changes on record between these events
	Super Tour Apr 2018 BUTTRA182018-04-27	1:39.142Gary Hickman · fastest of 2-3.130s (-3.06%)	1:38.870Gary Hickman · fastest of 2-1.241s (-1.24%)							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%)		+7.084squal +7.181s	107.2%qual 107.2%
No rule changes on record between these events
	Super Tour Apr 2017 BUTTRA172017-04-28	1:42.272John LaBrie · fastest of 2	1:40.111Gary Hickman · fastest of 2		1:44.060Vince Balch · fastest of 8 · top 5 within 18.6s	2:01.122Mike Miserendino · fastest of 7 · top 5 within 1.8s		+21.011squal +1.788s	121.0%qual 101.7%	1:45.956Mike Anderson · fastest of 8 · top 5 within 2.0s	1:46.271Mike Anderson · fastest of 10 · top 5 within 2.1s		+6.160squal +3.684s	106.2%qual 103.6%

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 FB" is the class's best as a share of FB'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 FB'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.