BoP Lab / Buttonwillow Raceway Park

P2 + STL at Buttonwillow Raceway Park

No mapCal Club 2024, Cal Club 2023

This track has been raced on 4 configurations (The Circuit, 2.57 mi; 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.

7 laps are left out as timing errors (far too short to be a lap of this track). The rest of those sessions, sectors included, is used.

Pos	Car	Driver	Class	#	Lap	Theoretical	Qual	Race	5-lap stint	Consistency	Trap	S1	S2	S3
1	Stohr WF1 (2004)	Kevin Mitz	P2	13	1:12.573 D-Q2		1:12.573 D-Q2
2	Stohr WF1	Tim Day Jr >115%	P2	8	1:37.278 A-Q1	1:37.278	1:37.278 A-Q1	1:39.758 A-R2	1:40.037 A-R2	+1.010 A-R2	155.4 A-R2	26.848 A-Q1	28.010 A-Q1	42.420 A-Q1
3	Mazda MX-5	Jared Korth	STL	27	1:51.665 B-P	1:51.645		1:58.002 A-R2	1:58.825 A-R2	+1.245 A-R2	134.8 A-R1, A-R2	30.616 B-P	32.218 B-P	48.811 B-P
4	Mazda Miata	Wesley Mollno	STL	10, 11, 111	1:52.983 B-P	1:52.983	1:59.582 A-Q1	1:59.163 A-R1	1:59.870 B-R2	+0.510 B-R2	133.4 A-Q1	30.838 B-P	33.020 B-P	49.197 B-P
5	Mazda Miata	Jon Davies	STL	67	1:53.071 B-P	1:53.071	1:59.281 B-Q1	1:59.121 B-R1	1:59.683 B-R1	+1.145 B-R1	127.3 B-P	30.815 B-P	32.820 B-P	49.536 B-P
6	Mazda RX-8	David LeCren	STL	2	1:53.515 B-P	1:53.253	2:09.464 A-Q2	2:11.372 A-R2	2:11.978 A-R2	+5.025 A-R2	121.0 A-Q2	31.217 B-P	32.486 B-P	49.550 B-P
7	Mazda Miata	Sayo Haraishi	STL	34	1:54.120 B-P	1:54.019	2:08.265 B-Q1	2:09.190 B-R1	2:09.557 B-R1	+0.759 B-R1	105.6 B-P	31.129 B-P	33.359 B-P	49.531 B-P
8	Mazda MX-5	Ricardo Arruda	STL	16	1:54.343 B-P	1:54.343	2:00.717 B-Q2	2:01.410 B-R1	2:02.207 B-R1	+0.929 B-R1	104.3 B-P	31.248 B-P	32.888 B-P	50.207 B-P
9	Mazda MX-5	Gavin Wardle	STL	169	1:54.845 A-R1	sector data unreliable	1:58.292 A-Q2	1:54.845 A-R1	1:59.598 A-R2	+0.868 A-R2	132.7 A-R2	8.264	33.984	51.822
10	Mazda Miata	Nick Leverone	STL	137, 37	1:54.963 B-Q2	1:54.891	1:54.963 B-Q2	1:55.682 B-R1	1:56.512 B-R1	+1.038 B-R1	106.0 B-Q1	31.458 B-Q2	32.979 B-Q2	50.454 B-Q2
11	Honda Civic Si	Jonathan Lugod	STL	61	1:56.438 B-R1	1:56.128	1:57.331 B-Q2	1:56.438 B-R1	1:57.403 B-R1	+1.528 B-R1	106.8 B-P	31.787 B-P	33.468 B-P	50.873 B-P
12	Honda Prelude	Carl Young	STL	23	1:56.961 B-R1	1:56.631	1:57.917 B-Q2	1:56.961 B-R1	1:57.759 B-R1	+1.599 B-R1	104.5 B-Q2	31.994 B-R1	33.745 B-R1	50.892 B-R1
13	Mazda MX-5	Ryan Gutile	STL	116	1:57.404 B-Q1	1:57.004	1:57.404 B-Q1	1:57.483 B-R1	1:58.542 B-R1	+1.371 B-R1	128.4 A-Q2	31.829 B-R1	33.695 B-Q1	51.480 B-R1
14	Mazda Miata	Amy Mills	STL	114	1:57.757 A-Q2	1:57.494	1:57.757 A-Q2	1:58.239 B-R2	1:58.840 B-R2	+1.462 B-R2	122.6 A-R2	32.321 B-Q2	33.780 A-Q2	51.393 A-Q2
15	Mazda MX-5	Bryce Johnson	STL	15, 13	1:58.716 A-Q2	1:58.419	1:58.716 A-Q2	1:59.496 A-R2	1:59.874 A-R2	+0.878 A-R2	136.6 A-Q1	32.248 A-Q1	34.104 A-Q2	52.067 A-Q2
16	Mazda Miata	Patrick Drinkwine	STL	151	1:59.239 B-Q1	1:58.754	1:59.239 B-Q1	2:00.132 B-R1	2:00.548 B-R1	+0.505 B-R1	106.6 B-P	32.503 B-P	34.167 B-P	52.084 B-P
17	Mazda MX-5 (2015)	Adrian Comstock	STL	25	2:00.239 A-Q2	2:00.015	2:00.239 A-Q2	2:00.722 A-R1	2:01.250 A-R2	+0.672 A-R2	133.0 A-R2	32.847 A-R2	34.493 A-Q2	52.675 A-Q2
18	Mazda MX-5	Andy Chittum	STL	99	2:00.296 A-Q2	1:59.684	2:00.296 A-Q2	2:00.787 A-R1	2:01.366 A-R1	+1.093 A-R1	132.9 A-R2	32.848 A-Q1	34.467 A-Q2	52.369 A-Q2
19	Mazda Miata	Richard James	STL	191, 91	2:02.318 B-R1	2:01.786	2:02.441 A-Q1	2:02.318 B-R1	2:03.149 B-R2	+0.867 B-R2	126.7 A-R1	32.990 B-R1	35.132 A-Q1	53.664 B-R1
20	Mazda Miata	Todd Launchbaugh	STL	73	2:02.759 B-R1	2:02.624		2:02.759 B-R1	2:03.974 B-R1	+1.599 B-R1	98.5 B-R1	33.210 B-R1	35.059 B-R1	54.355 B-R1
21	Mazda Miata	Ayden Vaillancour	STL	88	2:03.022 B-R1	2:02.301	2:03.653 B-Q2	2:03.022 B-R1	2:03.841 B-R1	+0.936 B-R1	100.4 B-P	33.072 B-P	35.168 B-P	54.061 B-R1
22	Mazda Miata	Lauren Lewis >115%	STL	45	2:17.307 A-R1	2:16.162		2:17.307 A-R1	2:18.705 A-R1	+1.938 A-R1	108.6 A-R1	36.821 A-R1	39.026 A-R1	1:00.315 A-R2
23	Acura integra	Jack McEachern >115%	STL	21	2:24.310 B-Q2	2:22.511	2:24.310 B-Q2	2:24.550 B-R2	2:32.162 B-R1	+2.229 B-R1	77.6 B-Q1	38.960 B-Q1	41.141 B-Q2	1:02.410 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

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	Lap	Qual	Race	Trap	S1	S2	S3
Stohr WF1	P2	2	1:12.573Kevin Mitz	1:12.573Kevin Mitz	1:39.758Tim Day Jr	155.4Tim Day Jr	26.848Tim Day Jr	28.010Tim Day Jr	42.420Tim Day Jr
Stohr WF1 (2004)	P2	1	1:12.573Kevin Mitz	1:12.573Kevin Mitz
Stohr WF1	P2	1	1:37.278Tim Day Jr	1:37.278Tim Day Jr	1:39.758Tim Day Jr	155.4Tim Day Jr	26.848Tim Day Jr	28.010Tim Day Jr	42.420Tim Day Jr
Mazda Miata	STL	17	1:51.665Jared Korth	1:54.963Nick Leverone	1:54.845Gavin Wardle	136.6Bryce Johnson	8.264Gavin Wardle	32.218Jared Korth	48.811Jared Korth
Mazda MX-5	STL	6	1:51.665Jared Korth	1:57.404Ryan Gutile	1:54.845Gavin Wardle	136.6Bryce Johnson	8.264Gavin Wardle	32.218Jared Korth	48.811Jared Korth
Mazda Miata	STL	10	1:52.983Wesley Mollno	1:54.963Nick Leverone	1:55.682Nick Leverone	133.4Wesley Mollno	30.815Jon Davies	32.820Jon Davies	49.197Wesley Mollno
Mazda MX-5 (2015)	STL	1	2:00.239Adrian Comstock	2:00.239Adrian Comstock	2:00.722Adrian Comstock	133.0Adrian Comstock	32.847Adrian Comstock	34.493Adrian Comstock	52.675Adrian Comstock
Mazda RX-8	STL	1	1:53.515David LeCren	2:09.464David LeCren	2:11.372David LeCren	121.0David LeCren	31.217David LeCren	32.486David LeCren	49.550David LeCren
Honda Civic Si	STL	1	1:56.438Jonathan Lugod	1:57.331Jonathan Lugod	1:56.438Jonathan Lugod	106.8Jonathan Lugod	31.787Jonathan Lugod	33.468Jonathan Lugod	50.873Jonathan Lugod
Honda Prelude	STL	1	1:56.961Carl Young	1:57.917Carl Young	1:56.961Carl Young	104.5Carl Young	31.994Carl Young	33.745Carl Young	50.892Carl Young
Acura integra	STL	1	2:24.310Jack McEachern	2:24.310Jack McEachern	2:24.550Jack McEachern	77.6Jack McEachern	38.960Jack McEachern	41.141Jack McEachern	1:02.410Jack McEachern

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

2023-04-01 P2 Remove redundant effective date language and update engine table

#34012 from Club Racing Board · Rule change · TB 23-04 (2023-04 Fastrack)

neutralP2 engine table wording updated; redundant effective date language removed.

In P2 Engine Table, Spec Line B.1, change as follows:

2023-04-01 P2 E&O - Correct dimensional equivalents

#34038 from Club Racing Board · Rule change · TB 23-04 (2023-04 Fastrack)

slowerP2 motorcycle engines: 2011+ Kawasaki restrictor reduced to 34mm, minimum weight raised to 1100 lbs; 2009+ other brands weight raised to 1100 lbs.

In P2, GCR section 9.1.8.C.D.2, change as follows:
"Height: No part of the vehicle having special or significant aerodynamic function shall exceed a height of 115cm (45.275 inches)
above the ground with the car in normal racing trim, driver aboard."
In P2, GCR section 9.1.8.C.D.3, change as follows:
"However, no portion shall extend more than 10cm (3.937 inches) beyond a plane tangent to the outer face of the front and rear
wheels with tires."
P2 Engine Table
Spec

Show 1 more lines

Line Engine Series

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

2023-05-01 P2 Clarify minimum side body height requirement

#34143 from Club Racing Board · Rule change · TB 23-05 (2023-05 Fastrack)

neutralP2 side body height requirement clarified: outermost surface between wheel openings must equal front axle centerline height.

In P2, GCR section 9.1.8.C.D.6, change as follows:
"As viewed from the side, T the outermost surface of ~~side pods~~ body between the front and rear wheel openings and above the
floor must have a minimum height equal to the height of the front axle centerline."

2023-05-01 P2 Clarify closed cockpit single seat car allowance

#34144 from Club Racing Board · Rule change · TB 23-05 (2023-05 Fastrack)

neutralP2 closed cockpit single seat cars now prohibited unless specifically allowed in Table 1.

In P2, GCR section 9.1.8.C.C, add a section as follows:
"4. Closed cockpit single seat cars are not permitted unless specifically allowed by a spec line in Table 1."

2023-06-01 STL Clarify STL table B - IT spec notes on Tires

#34187 from Austin Hilliard · Rule change · TB 23-06 (2023-05 Fastrack)

neutralSTL ITA/ITS RX7 and 1985+ ITA/ITS/ITB/ITC vehicles clarified to conform to section 9.1.4.2 tire specifications.

In STL Spec Lines, Table B: Alternate Vehicle and Engine Allowances, change Notes as follows:
ITA-spec and ITS-spec RX7: "Must completely conform to ITCS specifications. Tires must conform to 9.1.4, Tires & Wheels. Tires
must also conform to 9.1.4.2.Tires."
ITS, ITA, ITB, or ITC vehicles (1985- ): "Must completely conform to ITCS specifications. Tires must conform to 9.1.4, Tires &
Wheels. Tires must also conform to 9.1.4.2.Tires."

2023-12-01 P2 Correct Table 1 for Engine Date Range Specifications

#35182 from Formula/Sports Racing Committee · Rule change · TB 23-12 (2023-09 Fastrack)

neutralP2 Table 1 corrects engine date ranges and brand specifications for Stock and Modified engines across multiple car models.

In P2 Table 1, change as follows:
P2 Table 1 (Spec Line Cars)

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

2024-01-01 STL Alternate Carburetor Request for 79-85 RX7 12a

#35181 from Dan Sheppard · Rule change · TB 24-01 (2024-01 Fastrack)

unclearSTL Mazda RX-7 12A (79-85) now allows auto-type 2 bbl with 42mm choke(s) on dual-y manifold as alternate to stock Nikki 4 bbl.

In STL Table B: Alternate Vehicle and Engine Allowances, Mazda RX-7 12A (79-85), change Notes as follows:
"Street Porting of the engine only. Bridge porting, peripheral porting, and eyelash porting are prohibited. Contact SCCA National
Office for details of Street porting. Stock Nikki 4 bbl carburetor on a stock manifold ~~only.~~ or auto-type 2 bbl w/42mm choke(s) on
a “dual-y” manifold. Allow the standard removal of emissions related components, and allow air and fuel jets to be corrected.
Modification of the water jacket in the area of the spark plug for cooling purposes is permitted."

2024-01-01 P2 E&O - Clarify B.1 modified engine range in AMAC spec lines

#35225 from Club Racing Board · Rule change · TB 24-01 (2024-01 Fastrack)

neutralP2 AMAC modified engine range clarified to 2008 and older stock engines only, restrictor 38mm, weight 1025 lbs.

In P2 Table 1, change as follows:
P2 Table 1 (Spec Line Cars)

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

2024-01-01 P2 Replacement Engine Crankcase for 07/08 Suzuki GSX-R1000 Engines

#35340 from Michael A Reupert · Rule change · TB 24-01 (2024-01 Fastrack)

unclearP2 Suzuki GSX-R1000 07/08 engine crankcase may swap to GSX-S1000 16/19 part #11301-04840.

In P2 Engine Table, Spec Line B.1, add to notes as follows:
"No modifications allowed on engines manufactured after 2008 model year. 2007-2008 Suzuki GSX-R1000 crankcase part
#11300-21860 may be replaced with 2016-2019 Suzuki GSX-S1000 crankcase part #11301-04840."

2024-02-01 STL ST Electric-Assisted Steering Systems

#35066 from Jose Osiris Pena · Rule change · TB 24-02 (2024-01 Fastrack)

neutralSTL and STU power steering rules clarified to permit electric-assisted and hydraulic-assisted steering systems.

In GCR, Section 9.1.4.M.16., change as follows:
"Power steering may be modified in any of the following ways:
a. disconnected , pump, belt, pulley, and hoses may be removed. Hoses may also be looped. Steering rack or box may be
modified internally to work without pump.
b. an OEM manual steering rack for that model may be fitted
c. an electric power steering pump may be fitted
d. an OEM electric-assisted steering system may be used or any column mounted electric steering assist may be used
e. an OEM hydraulic-assisted steering system may be used"

2024-02-01 STL BOP Adjustments

#35112 from Super Touring Committee · Rule change · TB 24-02 (2024-01 Fastrack)

fasterSTL Acura/Honda B-series and Mazda MZR restrictors reduced 2mm; minimum weights down 25–75 lbs for 1900–2000cc engines.

In GCR, 9.1.4.H.1., change as follows:
"Minimum weights for cars with normally aspirated piston engines will be determined by ~~1.35 lbs/cc displacement for~~
~~the installed engine (see~~ the following table). Displacement is the factory displacement for the installed engine. For the
purpose of weight assignment, engine displacement will be rounded to the nearest 50cc (e.g., 2176cc = 2200cc and
2175cc = 2150cc)."
In GCR, 9.1.4.H.1., change Minimum Weight on Chart as follows:
Factory Engine Displacement 1900: "Effective 3-1-24: ~~2565~~ 2540"
Factory Engine Displacement 1950: "Effective 3-1-24: ~~2633~~ 2583"

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Factory Engine Displacement 2000: "Effective 3-1-24: ~~2700~~ 2625"
In GCR, 9.1.4.H.3., change as follows:
"Front wheel drive cars with a strut type front suspension may reduce their minimum weight by 2.5 percent. Effective 3-
1-24: Front wheel drive cars with 95" or less wheelbase must add 1.25% to their minimum weight."
In STL Spec Lines, change Notes as follows:
Acura/Honda B16: "Effective 3-1-24: 53 51mm"
Acura/Honda B17: "Effective 3-1-24: 53 51mm"
Acura/Honda B18C1: "Effective 3-1-24: 53 51mm"
Acura/Honda B18C (JDM Type R), B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R):
"Effective 3-1-24:52 50mm"
Mazda MZR: "Effective 3-1-24: 52 50mm"

2024-02-01 STL Mazda 12A

#35320 from Super Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)

slowerSTL Mazda 12A must keep 5th and 6th intake port actuators and valves, no longer allowed removal or disabling.

In STL Spec Lines, Table A, Mazda 12A, change Notes as follows:
"~~The 5th and 6th intake port actuators and valves may be removed or disabled.~~"

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

2024-05-01 P2 CN Spec ECU

#35835 from Bart Wolf · Rule change · TB 24-05 (2024-05 Fastrack)

neutralP2 Spec ECU engine modifications clarified: oil system, ECU, and exhaust unrestricted only.

In P2 Engine Table, Spec Line E, change the notes as follows:
"No engine modifications except f~~or dry sump oil system, ECU mapping, and exhaust system~~ the following: oil system, ECU, and
exhaust are unrestricted."

2024-05-01 P2 E&O - Correct FIA Group CN spec line notes

#35900 from Club Racing Board · Rule change · TB 24-05 (2024-05 Fastrack)

neutralP2 FIA Group CN spec notes clarified: Series changed to Challenge, documentation requirement moved to online link.

In P2 Table 1, FIA Group CN spec line, change the notes as follows:
"FIA Group CN homologated chassis, brake calipers and discs, hub carriers, and suspension components are required. V de
V European Proto Endurance ~~Series~~ Challenge permitted bodywork, rear diffuser, wing, wheels, and assisted
shifting are allowed. Car M must comply with all other P2 requirements. ~~Competitors must have copies of~~ FIA Group CN
Technical Regulations and V de V European Proto Endurance ~~Series~~ Challenge Sporting and Technical Regulations ~~in their~~
~~possession and present them upon request~~ are available here: https://www.scca.com/pages/technical-forms-and-downloads."

2024-12-01 STL Request to Remove Miata Hubs from General category

#37138 from Christopher Childs · Rule change · TB 24-12 (2024-12 Fastrack)

neutralSTL/STU: 90-05 Mazda Miata alternate front wheel hubs moved from General to specific part approval.

In GCR, Section 9.1.4.M.18., change as follows:
"18. Allow alternate front wheel front hubs, Mazda Motorsports Development Part #0000-04-5HUB-S1, for the 90-05 Mazda
Miata~~: Mazda Motorsports Development Part #0000-04-5HUB-S1~~."

2024-12-01 P2 2000 cc Pinto Engine Car Weight

#37187 from Marvin Hodges · Rule change · TB 24-12 (2024-12 Fastrack)

slowerP2 2000cc Pinto engine car minimum weight set to 1335 lbs.

In P2 Engine Table, Line E Note 2, add the following:
"8. Minimum weight 1335 lbs."

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

2025-05-01 STL E&O: SMX Allowance in STL

#37945 from Greg Amy · Rule change · TB 25-05 (2025-05 Fastrack)

unclearSTL Mazda MX5 Challenge minimum weight now references GCR 9.1.7.1 instead of 2500 lbs; spec components removed, only alternative tires allowed.

In STL Spec Lines, Table B, Mazda Spec MX5 Challenge, change as follows:
Minimum Weight: "~~2500~~ See 9.1.7.1."
Notes: "~~Mazda MX5 Challenge car must utilize the following components: Roush CNC cylinder head 0000-01-5300,Mahle~~
~~standard or +0.005 0000-01-5310, OEM camshaft, 11:1 compression ratio, header 0000-06-5407-NC, exhaust 0000-06-5427-NC,~~
~~cold air intake 0000- 06-5150-KT, ECU flash 0000-01-5379, Pagid front brake pads 0000-03-5104-SP or endurance pads 0000-03-~~
~~5104-EN, Pagid rear brake pads 0000-03-5114-SP or endurance pads 0000-03-5114-EN, Penske front shock 0000-04-5291-SA,~~
~~Penske rear shock 0000-04-5292-SA, Penske rear mount kit 0000-04-5358, Front mount kit 0000-04-5359, Front offset bushing~~
~~0000-04-5407-NC, Eibach front springs 0000-04-9700-08, Eibach rear springs 0000-04-9400-07, Eibach helper springs 0000-04-~~

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~~9926, Eibach front sway bar 0000-04-5306-FT, Eibach rear sway bar 0000-04-5306-RR, Interior finish panels 0000-07-5822, C&R~~
~~radiator/oil cooler assembly 0000-01-5504-CR, Oil cooler adapter and lines 0000-01-5511-KT, ACT clutch 0000-02-5004-G6,~~
~~wheels 17x8 #0000-04-5706-GM, # 0000- 04-5706-SL, and Toyo RR 235-40-17 dry, Toyo RA1 235-40-17 wet. Alternative tires on~~
~~17x7 wheels per STL rules. No other Super Touring modifications or allowances permitted except as noted in this spec line.~~ Must
conform completely to GCR 9.1.7.1, except alternative tires (only) per STL regs allowed."

Applies to Mazda Miata on this page: Jared Korth, Ricardo Arruda, Gavin Wardle, Ryan Gutile, Bryce Johnson, Andy Chittum, Adrian Comstock

2025-08-01 STL Lotus Weight Reduction

#38772 from Club Racing Board · Rule change · TB 25-08 (2025-08 Fastrack)

fasterSTL/STU Lotus weight reduced: Evora GT4 to 2700 lbs, Elise Cup R to 2250 lbs, Elise/Exige SC to 2450-2550 lbs.

In 9.1.2. GT2/ST Spec Lines, Lotus Evora GT4, change Weight as follows:
"~~2750~~ 2700"
In STU Table B: Alternate Vehicle and Engine Allowances, change Weight as follows:
Lotus Elise Cup R: "~~2300~~ 2250"
Lotus Elise SC/ Lotus Exige SC: ~~"2300~~ 2550
~~2500~~ 2450"

2026-01-01 STL Weight adjustment for STL

#39579 from Super Touring Committee · Rule change · TB 26-01 (2026-01 Fastrack)

slowerSTL minimum weights increase across all classes, 1300 cc gains 195 lbs to 1950, up to 1850 cc at 2500.

In GCR, Section 9.1.4.2.H.1. change Minimum Weight on chart as follows:

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.