BoP Lab / Buttonwillow Raceway Park

GTX at Buttonwillow Raceway Park

Pos	Car	Driver	Class	#	Best lap	Best theoretical lap	Best qual lap	Best race lap	Best trap speed	Best S1	Best S2	Best S3
1	Chevrolet	Bob Blizzard	GTX	9	1:49.569 B-P	1:49.051			124.2 B-P	29.869 B-P	31.704 B-P	47.478 B-P
2	Ford Mustang GT4	Rob Scholl	GTX	22	1:49.596 B-R2	1:48.800		1:49.596 B-R2	116.4 B-R2	30.070 B-R2	31.820 B-R1	46.910 B-R2
3	Porsche 981 Cayman	Moze Cowper	GTX	111	1:54.892 A-Q1	1:54.066	1:54.892 A-Q1	1:55.330 A-R2	146.0 A-R1	31.377 A-R1	32.983 A-R2	49.706 A-Q1
4	Chevrolet Camero	Michael Arnheiter	GTX	63	1:59.339 B-P	1:56.800			124.8 B-P	32.354 B-P	33.705 B-P	50.741 B-P

One row per driver and car (a driver who changed cars has a row for each). Each cell is that driver's best in that car across the selected events, with the session it was set in; the fastest in each column is purple, and a car whose best lap is more than 115% of the fastest in its class is greyed, marked ">" (with ">115%" beside the driver) and left out of the colour scale. Click a column to sort, a row to highlight it. Theoretical lap is the sum of the best sectors, whichever laps they came from, and never slower than the best lap (where a car's fastest laps were recorded without sector times, its best lap is used). The 115% mark is about the car's best lap only: a car whose best lap is within 115% of the fastest in its class is never marked. Greyed sectors with no theoretical lap mean the sector times on file do not add up to a believable lap. Letters refer to the events above; Q is qualifying, R a race.

Sectors

S1 SF → IM1 0.65 mi
S2 IM1 → IM2 0.75 mi
S3 IM2 → SF 1.17 mi
Spd In → Out 0.03 mi

Sectors are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.

By car

Car	Class	Drivers	Best lap	Best qual	Best race	Best trap	Best S1	Best S2	Best S3
Chevrolet	GTX	2	1:49.569Bob Blizzard			124.8Michael Arnheiter	29.869Bob Blizzard	31.704Bob Blizzard	47.478Bob Blizzard
Chevrolet	GTX	1	1:49.569Bob Blizzard			124.2Bob Blizzard	29.869Bob Blizzard	31.704Bob Blizzard	47.478Bob Blizzard
Chevrolet Camero	GTX	1	1:59.339Michael Arnheiter			124.8Michael Arnheiter	32.354Michael Arnheiter	33.705Michael Arnheiter	50.741Michael Arnheiter
Ford Mustang GT4	GTX	1	1:49.596Rob Scholl		1:49.596Rob Scholl	116.4Rob Scholl	30.070Rob Scholl	31.820Rob Scholl	46.910Rob Scholl
Porsche 981 Cayman	GTX	1	1:54.892Moze Cowper	1:54.892Moze Cowper	1:55.330Moze Cowper	146.0Moze Cowper	31.377Moze Cowper	32.983Moze Cowper	49.706Moze Cowper

The best any driver of each car managed across the selected events, with who set it. Spellings and model years of the same car are grouped; click a row marked ▸ to see each version. Grouping is worked out from the names, so tell us if two cars are wrongly merged or split.

Rule changes between these events

Cal Club 2025 → Cal Club 2026 2025-02-22 to 2026-02-21

2025-05-01 GTX Request to Classify Porsche GT2 RS Clubsport

#37972 from Paul Fairchild · Rule change · TB 25-05 (2025-05 Fastrack)

In GTX, Classify Porsche GT2 RS Clubsport, as follows:
GTX
Make Homologation Model Restrictor
(mm)
Weight
(lbs) Notes
Porsche GT2 RS Clubsport Must have factory specifications available at all race events

2025-06-01 GTX Ligier P3 LS Swap

#38164 from Bart Wolf · Rule change · TB 25-06 (2025-06 Fastrack)

In GTX Spec Lines, GTX-MISC., Ligier, LMP3, 3.0L, Add to Notes the following:
"Allow any normally aspirated LS Chevrolet engine may be used."

2026-01-01 GTX Please Consider Adding a Spec Line to GTX Table 4 for the RCR T70

#39470 from Peter Jankovskis · Rule change · TB 26-01 (2026-01 Fastrack)

In GTX-Misc. Table 4, classify RCR70 Coupe:
GTX – MISC. TABLE 4
Make Homologation Model Restrictor

A specification table follows in the original; it is not shown here.

What the rules allowed changed as listed; this does not say what any particular car ran.