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BoP Lab / Buttonwillow Raceway Park

GT3U + FC at Buttonwillow Raceway Park

No mapCal Club 2024, Cal Club 2023

Track map: sectors and speed trap

Track map with timing sectors and speed trap
Shown for: Cal Club 2026 (practice, qualifying, race) · Cal Club 2025 (practice, qualifying, race)
Class · click a class to switch, + to compare alongside
Track configuration
Events

This track has been raced on 4 configurations (The Circuit, 2.57 mi; 19, 2.92 mi; 1.83 mi; 3.02 mi). Laps on different configurations are not comparable, so only events on the 2.57 mile layout are shown; switch above to see the others.

One session is left out because the timing does not look like full laps: Cal Club 2023 Qualifying #2.

PosCarDriverClass#LapTheoreticalQualRace5-lap stintConsistencyTrapS1S2S3
1Van Diemen DP-08Robert ArmingtonFC111:45.137 A-Q21:44.9431:45.137 A-Q21:45.314 A-R21:46.641 A-R2+1.552 A-R2143.5 A-Q229.106 A-Q230.109 A-R145.728 A-Q2
2Van Diemen RF96Shawn SarbackerFC31:47.570 A-R21:47.2051:47.741 A-Q21:47.570 A-R21:48.139 A-R2+2.423 A-R2146.2 A-Q229.351 A-Q230.778 A-R247.076 A-R2
3Van Diemen RF97Bill WallschlaegerFC01:47.993 A-R21:47.7661:51.040 A-Q11:47.993 A-R21:48.553 A-R2+1.107 A-R2147.5 A-R229.638 A-R230.895 A-R247.233 A-R2
4Van Diemen RF01Paul MacFarlaneFC531:48.522 B-R11:48.4811:50.067 B-Q11:48.522 B-R11:49.143 B-R1+2.405 B-R1114.4 B-R229.050 B-R131.137 B-R148.294 B-R1
5Mazda RX-7Michael LewisGT3U321:55.650 B-R21:55.4402:00.536 B-Q11:55.650 B-R21:56.657 B-R2+2.951 B-R2129.8 B-P31.468 B-R233.670 B-R250.302 B-R2
6Van Diemen RF (2000)Greg PizzoFC141:58.213 A-R21:57.3332:10.106 A-Q21:58.213 A-R22:01.052 A-R2+4.196 A-R2127.3 A-R232.045 A-R234.162 A-R251.126 A-R2
7Mazda RX-7Justin GrahamGT3U502:03.073 B-R22:03.0732:07.538 B-Q12:03.073 B-R22:07.183 B-R1+2.448 B-R1101.0 B-R133.001 B-R235.220 B-R254.852 B-R2

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. Best 5-lap stint is the mean of the driver's quickest five consecutive race laps, and consistency is how far their median race lap sat behind their best in that race (small is a driver who does it every lap); both come from the race with the best stint. 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 ">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

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

CarClassDriversLapQualRaceTrapS1S2S3
Van Diemen RF01FC21:45.137Robert Armington1:45.137Robert Armington1:45.314Robert Armington143.5Robert Armington29.050Paul MacFarlane30.109Robert Armington45.728Robert Armington
Van Diemen RF96FC11:47.570Shawn Sarbacker1:47.741Shawn Sarbacker1:47.570Shawn Sarbacker146.2Shawn Sarbacker29.351Shawn Sarbacker30.778Shawn Sarbacker47.076Shawn Sarbacker
Van Diemen RF97FC11:47.993Bill Wallschlaeger1:51.040Bill Wallschlaeger1:47.993Bill Wallschlaeger147.5Bill Wallschlaeger29.638Bill Wallschlaeger30.895Bill Wallschlaeger47.233Bill Wallschlaeger
Mazda RX-7GT3U21:55.650Michael Lewis2:00.536Michael Lewis1:55.650Michael Lewis129.8Michael Lewis31.468Michael Lewis33.670Michael Lewis50.302Michael Lewis
Van Diemen RFFC11:58.213Greg Pizzo2:10.106Greg Pizzo1:58.213Greg Pizzo127.3Greg Pizzo32.045Greg Pizzo34.162Greg Pizzo51.126Greg Pizzo

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 2023 → Cal Club 2024 2023-02-24 to 2024-02-23

FC USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC

#34329 from Formula/Sports Racing Committee · Rule change · TB 23-06 (2023-06 Fastrack)

Summary

cars addedUSF2000 Van Diemen with Mazda MZR LF-DE 2.0L added as spec line car in FC; removed from FX.

As printed in Fastrack

RM 23-07, USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC, GCR section 9.1.1.B.1, add a new section and re-letter the
following sections accordingly:
"c. The USF2000 tube frame Van Diemen car powered by the Mazda MZR LF-DE 2 liter engine is added as a "spec line" car in
Formula Continental. Additional "spec line" cars are disfavored, and Balance of Performance (BoP) adjustments to keep "spec
line" cars competitive with cars that meet the class formula are likewise disfavored."
In FC, GCR section 9.1.1.B.11, add the following:
"The only permitted engines are:
a. The Ford 2 liter single overhead camshaft "NE" series engine or the 1971-74 Pinto/Capri 2 liter single overhead camshaft

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engine. The specifications are contained in B.15.
b. The Ford Zetec ZX3 2 liter dual overhead camshaft engine. The specifications are contained in B.16.
c. The Mazda MZR LF-DE 2 liter for use only in USF2000 cars, as described in the Spec Line Cars Table below."
In FC, GCR section 9.1.1.B, add the following:
In FX, GCR section 9.1.1.J.B, change as follows and renumber the remaining lines accordingly:
"3. USF2000 (tube frame) – Shall comply with FRP F2000 Technical Specifications (2018)
4. Pro Formula F2000 (tube frame) – Engine must be prepared to current FC rules."
In FX Table 1, remove the USF2000 Tube Frame and Pro Formula F2000 Tube Frame spec lines in their entirety.
Spec Line Cars Table

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

FC Review FC Runoffs Tire Marking Rule

#34274 from SCCA Staff · Rule change · TB 23-06 (2023-05 Fastrack)

Summary

wordingFC tire marking rule clarified: four dry and wet tires for Regionals, eight each for Runoffs; damaged tire replacement procedures revised.

As printed in Fastrack

In FC, GCR section 9.1.1.B.10.h, change as follows:
"FC shall be is permitted a maximum of four (4) dry tires and four (4) wet tires for all Regional, Major, and Super Tour events;
eight (8) dry tires and eight (8) wet tires are permitted for the Runoffs. This rule shall be is effective beginning with the first (1st)
qualifying session of the event. Marked tires are not required for testing or practice. It is the competitor's responsibility to
ensure that the tires are declared, marked, and logged by Tech in advance of the tire(s) being used in a qualifying session or
race. Failure to participate on marked tires will result in a penalty.
1. Use of an undeclared tire shall automatically result in all times being disallowed in that session or finishing position in that
race.

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2. If a tire is damaged during a qualifying session or a race, the competitor may replace the damaged tire with a used tire upon
approval by the Chief Steward without loss of time or finishing position. Second or subsequent damaged tires may similarly be
replaced upon approval by the Chief Steward, however but such shall will result in the loss of grid position in the subsequent race
or session; the competitor shall will start at the back of the grid. Replacement of a damaged tire with a new tire upon approval by
the Chief Steward will result in loss of grid position in the subsequent race or session."

FC Please correct omitted punctuation

#34890 from Club Racing Board · Rule change · TB 23-10 (2023-09 Fastrack)

Summary

engineF600 Rotax 494, 493, 593 engines now require single expansion chamber and pull starter; electric starter optional.

As printed in Fastrack

In Cars and Equipment, GCR section 9.3.33.B.2, add the following:
"(Effective 1/1/2024) A red taillight meeting FIA Standard 8874-2019, Technical List No. 76, is required on all Formula (open
wheel) and Sports Racing cars."
In Appendix F. Technical Glossary, Minimum Weight, change as follows:
"Minimum Weight: – Weight specified with driver, exactly as they come off the race circuit, at the conclusion of any race or
qualifying session."
In FA Table 1, Spec Line E notes, add the following:
"Any BD series iron or alloy cylinder block and alternate crankshaft permitted."

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In FC, GCR section 9.1.1.B.11.c, change as follows:
"The Mazda MZR LF-DE 2 liter for use only in USF2000 cars, as described in the Spec Line Cars Table below.""
In F600, GCR section 9.1.1.D.14, add the following:
"Rotax Model 494, Model 493, and Model 593 must use a single expansion chamber and must be equipped with a pull starter;
an electric starter may be added."
In P1, GCR section 9.1.8.B.J.2, add the following:
"Where a flat plate intake restrictor, restricted venturi, or Single Inlet Restrictor (SIR) is required, all intake air for each cylinder
or the entire fuel-air mixture, if prepared before this point, must pass through the restrictor."

Cal Club 2024 → Cal Club 2025 2024-02-23 to 2025-02-22

FC Four Pot Calipers

#35481 from Steve Jenks · Rule change · TB 24-04 (2024-04 Fastrack)

Summary

cars addedFC adds F2000 Metrik ZF2 with Ford Zetec engine and four-piston Brembo calipers as spec-line car.

As printed in Fastrack

In FC Table FC Charts, add the following:
In FC, GCR section 9.1.1.B.1.c, change as follows:
"The USF2000 tube frame Van Diemen car powered by the Mazda MZR LF-DE 2 liter engine and the F2000 Metrik ZF2 car
equipped with 4-piston calipers is are added as a "spec line" cars in Formula Continental. Additional "spec line" cars are
disfavored, and Balance of Performance (BoP) adjustments to keep "spec line" cars competitive with cars that meet the class
formula are likewise disfavored."
FC Charts
Car Engine Wheel Width

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(in) ± .060 Aero Transmission Weight Notes

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

FC 9.1.1.10.h. FC Tire Rule

#36533 from SCCA Staff · Rule change · TB 24-09 (2024-09 Fastrack)

Summary

slowerFC tire limit reduced to four dry and four wet for Regional/Major/Super Tour, eight for Runoffs.

As printed in Fastrack

In FC, GCR section 9.1.1.B.10.h, change as follows:
"(Effective 11/1/2024) FC is permitted a maximum of four (4) dry tires and four (4) wet tires for all Regional, Major, and Super
Tour events; eight (8) dry tires and eight (8) wet tires are permitted for the Runoffs. This is effective beginning with the first (1st)
qualifying session of the event. Marked tires are not required for The tire limit does not apply to testing or practice. It is the
competitor's responsibility to ensure that the tires are declared, marked, and logged by Tech immediately upon conclusion of the
first qualifying session, as provided in the event supplemental regulations, or per the instructions of the Race Director or Chief
Steward. in advance of the tire(s) being used in a qualifying session or race. Failure to participate on marked Use of tires in
excess of the number allowed will result in a penalty. Failure to participate on declared/marked/logged tires after the time

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prescribed for the same may result in a penalty. If a tire is damaged during a qualifying session or a race, the competitor may
replace the damaged tire with a used tire upon approval by the Race Director or Chief Steward without loss of time or finishing
position. Second or subsequent damaged tires may similarly be replaced upon approval by the Race Director or Chief Steward,
but such will result in the loss of grid position in the subsequent race or session; the competitor will start at the back of the grid.
Replacement of a damaged tire with a new tire upon approval by the Race Director or Chief Steward will result in loss of grid
position in the subsequent race or session; the competitor will start at the back of the grid."

FC Change FF/FC Weight with Sequential Gearbox

#36651 from Robert Wright · Rule change · TB 24-11 (2024-11 Fastrack)

Summary

fasterFF and FC cars with sequential gearbox must add 10 lbs. to minimum weight, down from 25 lbs.

As printed in Fastrack

In FF, GCR section 9.1.1.B.20.A.3, change as follows:
"Cars running with a sequentially shifted gear box shall must add 25 10 lbs. to minimum weight."
In FC, GCR section 9.1.1.B.20.B.4, change as follows:
"Cars running with a sequentially shifted gear box shall must add 25 10 lbs. to minimum weight."

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

GT3U Increase Minimum Weight

#37919 from Club Racing Board · Rule change · TB 25-03 (2025-03 Fastrack)

Summary

slowerSTU GT3U minimum weight increases 150 to 250 pounds.

As printed in Fastrack

In STU Spec Lines, Table C: STU-GT3U, change Minimum Weight as follows:
"150 250 pounds"

GT3U TCR Rulesets

#37981 from Club Racing Board · Rule change · TB 25-04 (2025-04 Fastrack)

Summary

fasterSTU-GT3U non-TCR cars may reduce weight by 4% after all other modifiers.

As printed in Fastrack

In STU-GT3U Spec Lines, Table C, add the following:
"Table C: STU-GT3U
Refer to section 9.1.2."
In GCR, Section 9.1.4.H.7, change as follows:
"All current STU cars, except TCR cars, may reduce their weight by 4% after all other modifiers"

GT3U Table C: STU-GT3U Clarification

#38268 from Club Racing Board · Rule change · TB 25-05 (2025-05 Fastrack)

Summary

fasterSTU Spec Line GT3U minimum weight reduced from plus 250 to plus 225 pounds; wheel and tire options clarified with weight adjustments.

As printed in Fastrack

In STU Spec Line, Table C: STU-GT3U, change as follows:
Minimum Weight: “Current GT3 race weight plus 250 225 pounds”
Notes: "DOT approved tire with maximum section width of 245. GT3 cars base wheel is a maximum of 15”x9”. 18”x9” wheels
allowd with a 3% weight addition. GT3 cars utilizing 15”x7” wheels are limited to a maximum section width of 225 with a 25
pound weight reduction"
"All GT3U (Majors and Runoffs) cars using up to 15"x7" wheels limited to 225 section width tires shall run at current GT3 race
weight plus 225lbs. All Gt3U cars shall run a DOT approved tire with a maximum section width of 245. GT3U cars are allowed
optional 15"x9" wheels with a 1.5% weight addition or up to 18"x9" wheels with a 3.0% weight addition to the total weight

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including the 225 lbs."

FC F2000 MZR Spec Line Clarity/Revision Requested

#38927 from Rock Beauchamp · Rule change · TB 26-01 (2026-01 Fastrack)

Summary

wordingFC USF2000 Tube Frame may use Hewland LD200 4-speed H-pattern as alternative to Hewland JL-200 5-speed sequential.

As printed in Fastrack

In FC Charts table, USF2000 Tube Frame spec line, add the following to the Notes:
"Cars originally built with the Hewland LD200 4-speed H-pattern may use that transmission as an alternative to the Hewland JL-
200 5-speed sequential transmission."

FC Adjust F2000 Metrik ZF2 weight

#39612 from Club Racing Board · Rule change · TB 26-01 (2026-01 Fastrack)

Summary

fasterFC F2000 Metrik ZF2 minimum weight reduced to 1220 lbs.

As printed in Fastrack

In FC Charts table, F2000 Metrik ZF2 spec line, change the Weight as follows:
"1240 1220"

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