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.
5 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.
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
1:09.928Tim Day Jr
1:09.928Tim Day Jr
1:39.758Tim Day Jr
155.4Tim Day Jr
26.848Tim Day Jr
28.010Tim Day Jr
42.420Tim Day Jr
Stohr WF1
P2
1
1:09.928Tim Day Jr
1:09.928Tim Day Jr
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
BMW M3
T1
1
1:46.465Ian Barberi
1:46.465Ian Barberi
1:47.434Ian Barberi
114.9Ian Barberi
28.992Ian Barberi
30.811Ian Barberi
46.263Ian Barberi
BMW M4 GT4
T1
1
1:47.084Drew Delmonico
1:47.084Drew Delmonico
1:47.467Drew Delmonico
161.4Drew Delmonico
29.150Drew Delmonico
30.850Drew Delmonico
46.316Drew Delmonico
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
Pontiac GTO
T1
1
1:59.123Ed Gless
1:59.760Ed Gless
1:59.123Ed Gless
120.7Ed Gless
32.383Ed Gless
34.587Ed Gless
51.370Ed Gless
Ford Mustang
T1
1
1:59.261Pratt Cole
1:59.261Pratt Cole
98.6Pratt Cole
32.624Pratt Cole
34.661Pratt Cole
51.577Pratt Cole
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
T1 Sequential Gearbox Limitations in T1
#33691 from David Mead · Rule change · TB 23-03 (2023-03 Fastrack)
neutralT1 cars with aftermarket sequential transmissions get 10-inch max bellhousing; non-sequential cars gain 100 lbs weight break.
In GCR, Section 9.1.9.1.I.4., change as follows: "Aftermarket sequential transmissions are permitted. Cars with aftermarket sequential shift transmissions shall utilize a 1:1 (or greater/overdriven) ratio in top gear. Transmission location must be OEM. Maximum bellhousing length is 10 inches. Cars that don’t use an aftermarket sequential transmission may decrease their competition weight by 100 lbs."
In T1 Spec Lines, Chevrolet Camaro Gen 5 ('10-'15) Including SS, Z28, classify Spec Line Number 1135 as follows:
A specification table follows in the original; it is not shown here.
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:
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
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Line Engine Series
A specification table follows in the original; it is not shown here.
neutralT1 GT4 weights clarified for nine cars, ranging from 3200 lbs Porsche 718 Cayman to 3575 lbs Aston Martin.
RM 23-04 – Touring 1 weights dated 3/21/2023 As an E&O to the February Fastrack, in T1-GT4 leave weights as follows: Aston Martin Vantage AMR GT4: 3575 Audi R8 GT4: 3550 BMW M4 GT4: 3500 Ford Mustang GT4: 3550 Maclaren 570S GT4: 3450 Mercedes AMG GT4: 3450
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Porsche 718 Cayman GT4 CS MR: 3200 Porsche 718 GT4 RS Clubsport: 3450 Toyota Supra GR GT4: 3350
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."
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."
T1 Touring 1 Tire Sizes
#34191 from Club Racing Board · Rule change · TB 23-05 (2023-05 Fastrack)
fasterT1-GT4 McLaren 570S and Mercedes AMG GT4 front tires widen to 315 mm.
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."
T1 Gen 5 Camaro Engine
#33875 from Matt Spicuzzi · Rule change · TB 23-06 (2023-07 Fastrack)
neutralT1 Chevrolet Camaro Gen 5 LS7 gets two spec lines: 1131 with 70mm restrictor, 1136 with 53mm restrictor, both 3450 lbs minimum.
In T1-NEW Spec Lines, Chevrolet Camaro Gen 5 (10-15) Including SS, Z28, classify Spec Line Number 1131 and 1136 as follows:
A specification table follows in the original; it is not shown here.
T1 Inquiry to letter #33682
#34071 from Andrew Aquilante · Rule change · TB 23-06 (2023-07 Fastrack)
slowerT1 Chevrolet Camaro Gen 5, Corvette C5 and C6: engine resleeve restricted to stock parameters only, no longer LS3 bore/stroke.
In T1 NEW Spec Lines, Chevrolet Camaro Gen 5 (10-15) Including SS, Z28, change Engine Notes as follows: 1130: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." 1135: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement.May resleeve to stock parameters for engine repair or replacement." In T1 NEW Spec Lines, Chevrolet Corvette C5 (‘97-’04) – Includes: Z06, Coupe, Convertible, change Engine Notes as follows: 1132: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement."
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1134: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." 1136: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." 1138: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." In T1 NEW Spec Lines, Chevrolet Corvette C6 (05-13) - Includes Z51, GrandSport, Z06, Z06 Carbon, change Engine Notes as follows: 1150: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." 1160: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." 1170: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." 1180: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement." 1190: "May resleeve any LS block to LS3 bore/ stroke for Engine replacement. May resleeve to stock parameters for engine repair or replacement."
T1 Viper Cleanup
#34107 from Scotty B White · Rule change · TB 23-06 (2023-05 Fastrack)
fasterT1 Dodge Viper ACR/ACR-X restrictor increases from 50mm to 60mm flat plate.
In T1 NEW Spec Lines, Dodge Viper ACR/ACR-X Spec Line 1360, change Required Restrictor as follows: "50mm 60mm flat plate"
T1 Viper 8300 OEM FPR Size
#34268 from Scotty B White · Rule change · TB 23-06 (2023-05 Fastrack)
unclearT1 Dodge Viper ACR/ACR-X: Spec Line 1370 restrictor increases to 55mm, Line 1390 decreases to 55mm.
In T1 NEW Spec Lines, Dodge Viper ACR/ACR-X Spec Line 1370, change Required Restrictor as follows: "(2) 47mm 55mm flat plates" In T1 NEW Spec Lines, Dodge Viper ACR/ACR-X Spec Line 1390, change Required Restrictor as follows: "(2) 60mm 55mm flat plates"
T1 Ford Mustang S197 (05-14) Clarification
#34450 from Club Racing Board · Rule change · TB 23-06 (2023-05 Fastrack)
neutralT1 Ford Mustang S197 05-14 now requires OEM 8.8 differential housing.
In T1-NEW Spec lines, Ford Mustang S197 (05-14) Includes GT, Boss302, 302S, 302R, FR500C, FR500S, change Notes as follows: "OEM 8.8 Differential Housing"
T1 C5 Approved Aero That Was Mistakenly Deleted
#34374 from Joe Aquilante · Rule change · TB 23-08 (2023-08 Fastrack)
fasterT1 Corvette C5 gains approved aero parts: carbon rear spoiler, vented front splitter, side skirts, with 50 lb weight reduction allowed.
In T1 NEW Spec Lines, Chevrolet Corvette C5 (‘97-’04) – Includes: Z06, Coupe, Convertible, Spec Lines 1132-1138, add to Notes as follows: "Any option of OEM Bodywork parts may be used as basis for aero measurements. Rear spoiler max 5” Above bumper allowed. +50lbs. The following parts are permitted, with a 50lb decrease from base weight, in lieu of the aero options permitted in 9.1.9.1.B: (C7Carbon Rear- Spoiler CCC5 EX- RSB-GB, Vented Front Splitter CCC5-FS-GB, Side Skirts CCC5 SS-GB.)"
T1 Why no Camaro?
#34421 from Scotty B White · Rule change · TB 23-08 (2023-05 Fastrack)
neutralChevrolet Camaro GT4-R classified in T1 GT4 Spec Line 4035, minimum weight 3375 lbs, 315 max tire, 63mm restrictor, ineligible for Runoffs.
In T1 GT4 Spec Lines, classify Chevrolet Camaro GT4-R as follows:
A specification table follows in the original; it is not shown here.
T1 Request to Remove Expiration from T1 spec lines #1350 & #1370
#34470 from Scotty B White · Rule change · TB 23-08 (2023-05 Fastrack)
neutralT1 Dodge Viper ACR / SRT RT-10 and ACR/ACR-X spec lines 1350 and 1370 remove 12/23 expiration.
In T1 NEW Spec Lines, Dodge Viper ACR / SRT RT-10, change Spec Line Number as follows: "1350 *Spec line Expires 12/23*" In T1 NEW Spec Lines, Dodge Viper ACR/ACR-X, change Spec Line Number as follows: "1370 *Spec line Expires 12/23*"
neutralT1 GT4 BMW M4 Spec Line Number changed from 4050 to 4030.
In T1 GT4 Spec Lines, BMW M4, change Spec Line Number as follows: "4050 4030"
T1 New T1 add spec line for C5 corvette LS2 engines (Copy from C6)
#33764 from Craig Anderson · Rule change · TB 23-12 (2023-09 Fastrack)
neutralT1 Chevrolet Corvette C5 LS2 added with 6000cc displacement, 3300 lbs minimum weight, 72mm flat plate restrictor.
In T1 Spec Lines, classify Chevrolet Corvette C5 (‘97-’04) – Includes: Z06, Coupe, Convertible as follows:
A specification table follows in the original; it is not shown here.
T1 2004 - 2006 Pontiac GTO Re-Integration Back Into T1
#34403 from Ed Gless · Rule change · TB 23-12 (2023-12 Fastrack)
neutralPontiac GTO 2006-2009 re-integrated into T1 with LS2 at 3400 lbs, 72mm restrictor, and LS3 at 3500 lbs, 61mm restrictor.
In T1 Spec Lines, classify Pontiac GTO 2006-2009 as follows:
A specification table follows in the original; it is not shown here.
Applies to Pontiac GTO on this page: Ed Gless
T1 Request to Classify Porsche 997-1 GT3 Cup
#34561 from Scotty B White · Rule change · TB 23-12 (2023-12 Fastrack)
neutralT1 Porsche 997-1 GT3 Cup added at spec line 4210, minimum weight 3050 lbs.
In T1 Spec Lines, delete the Porsche 996 GT3 Cup car from the standard spec lines and classify "Homologated car" section as follows: T1 – Homologated Cars
A specification table follows in the original; it is not shown here.
T1 C7 Corvette Rule Change Request
#34897 from Heath Karl · Rule change · TB 23-12 (2023-09 Fastrack)
neutralT1 Chevrolet Corvette C7 (14-19) including Z51, Grandsport newly classified as homologated car.
In T1 Spec Lines, classify Chevrolet Corvette C7 (14 - 19) - Includes Z51, Grandsport as follows: T1 – Homologated Cars
A specification table follows in the original; it is not shown here.
T1 Camaro Gen 5 Weight Reduction Due to Competitive Disadvantage
#35092 from Clark Nunes · Rule change · TB 23-12 (2023-09 Fastrack)
fasterT1 Gen 5 Camaro minimum weight drops 75 lbs to 3475; restrictor increases 70mm to 75mm.
In T1 Spec Lines, Gen 5 Camaro, change as follows: Spec Line 1130 - Minimum Weight "3550 3475" Spec Line 1135 - Minimum Weight "3550 3475" Restrictor Required "70mm 75mm-Flat Plate"
unclearT1-GT4 batch adjustments: five cars lighter, two heavier, restrictors and ECU maps changed, five models now eligible for Runoffs.
In GCR, Section 9.1.9.1.A.T., change as follows: "Tires- Tires must conform to GCR section 9.3.TIRES and als o must conform to spec line requirements. DOT approved tires are permitted. Slicks conforming to the spec line are permitted." In Touring 1 - Homologated Cars Spec Lines, 4100- BMW M2 ClubSport Racing, change Must Conform To as follows: "Tires conforming to SRO TCX rules allowed. Must meet factory specs." In Touring 1 - Homologated Cars Spec Lines, 4120- Ford Mustang FP350S 2017, change as follows: Must Conform To: "Tires conforming to Trans Am SGT tire rules allowed Must meet factory specs." Chassis Notes: "VIN not required. Additional permitted allowances: DOT tires required. Other consumables are open, alternate
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driveshaft permitted, aftermarket wheels and fuel cell per Touring category rules permitted. Shocks conforming to T1 rules permitted. Alternative rear toe links permitted." In T1-GT4 Spec Lines, change Chassis Notes as follows: Aston Martin Vantage AMR GT4: "**NOT YET ELLIGIBLE FOR RUNOFFS COMPETITION (Q.2)** Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Audi R8 GT4: "**NOT YET ELLIGIBLE FOR RUNOFFS COMPETITION (Q.2)**Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." BMW M4 GT4: "**NOT YET ELLIGIBLE FOR RUNOFFS COMPETITION (Q.2)**Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Chevrolet Camaro GT4-R: "**NOT YET ELLIGIBLE FOR RUNOFFS COMPETITION (Q.2)**Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Ford Mustang GT4: "**NOT YET ELLIGIBLE FOR RUNOFFS COMPETITION (Q.2)**Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Maclaren 570S GT4: "Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Mercedes AMG GT4: "Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Porsche 718 Cayman GT4 CS MR: "Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Porsche 718 GT4 RS Club-sport: "Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." Toyota Supra GR GT4: "**NOT YET ELLIGIBLE FOR RUNOFFS COMPETITION (Q.2)**Slick tires conforming to IMSA GT4 or SRO GT4 specs are permitted." In T1-GT4 Spec Lines, change as follows: Aston Martin Vantage AMR GT4: Weight: “3575 3490” Performance Control: “SRO power level ECU Map 3 IMSA Map id 11” Chevrolet Camaro GT4-R: Weight: “3375 3435” Performance Control: “63 62mm” Ford Mustang GT4: Weight: “3550 3535” Performance Control: “63 71mm SRO compliant restrictor IMSA ECU Cal” Maclaren 570S GT4: Weight: “3450 3250” Performance Control: “SRO 2019 BOP ECU map SRO Rest 1” Mercedes AMG GT4: Weight: “3450 3470” Performance Control: “Power level 2 map 5” Porsche 718 Cayman GT4 CS MR: Weight: “3200 3250” Performance Control: “54 53.7mm” Toyota Supra GR GT4: Weight: “3350 3315”
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."
In T1 Spec Lines, delete the following spec line numbers in their entirety:
A specification table follows in the original; it is not shown here.
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.
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."
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"
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"
neutralT1 NEW class removes 23 spec lines including Acura NSX, Ferrari, Porsche 996, Nissan Z cars, and others; Porsche 997 spec line 1680 expiration removed.
In GCR Contents, change as follows: "9.1.9.1 TOURING (T1) CATEGORY NEW T1 NEW" In GCR, Section 9.1.9.1.Touring (T1) NEW Category Specifications, change as follows: "9.1.9.1.Touring (T1) NEW Category Specifications" In T1 NEW Spec Lines, change as follows: "9.1.9.1.A T1 NEW Spec Lines" "T1 NEW"
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In T1 NEW Spec Lines, delete the following Spec Lines in their entirety: "Acura NSX (Spec Line 1000) Acura NSX Turbo (Spec Line 1010) Acura NSX Turbo World Challenge (Spec Line 1020) Audi TTRS (GTS 2011 Spec) (Spec Line 1040) Dodge Viper ACR/ACR-X (Spec Line 1360) Ferrari 360 (Spec Line 1400) Ferrari 430 (Spec Line 1410) Ferrari 430 Challenge (Spec Line 1420) Mazda MX-5 (06-15) (Spec Line 1520 and 1530) Mazda RX-7 (Spec Line 1540) Nissan GTR (Spec Line 1550) Nissan 350/370Z (Spec Line 1560) Nissan 370Z Supercharged (Spec Line 1570) Nissan 350Z (Spec Line 1580) Nissan 350Z/370Z (Spec Line 1590) Porsche Cayman/S/GTS (05-15) (Spec Line 1600, 1610 and 1620) Porsche Cayman GTS (2011) (Spec Line 1630) Porsche 928 S4 Porsche 928 GTS-R (Spec Line 1640) Porsche 996 (Spec Line 1650) Porsche 996 TT OEM (Spec Line 1660) Subaru WRX, WRX STI (05-2020) (Spec Line 1700) Toyota Celica All-Trac (Spec Line 1710) Toyota Supra MK4 (Spec Line 1720)" In T1 NEW Spec Lines, Porsche 997, change Spec Line Number as follows: "1680 *Spec line Expires 12/23*"
Cal Club 2024 → Cal Club 2025 2024-02-23 to 2025-02-22
T1 9.1.9.1 T1 new category item/ line 26 rule to expire Jan 1 2023
In P2 Engine Table, Spec Line E, change the notes as follows: "No engine modifications except for dry sump oil system, ECU mapping, and exhaust system the following: oil system, ECU, and exhaust are unrestricted."
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."
neutralBMW M4 GT4 (G82) added to T1 GT4 at 3525 lbs minimum weight with Red power stick control.
In T1 GT4 Spec Lines, SL#4030, change as follows: Model: "BMW M4 GT4 (F82)" Performance Control: "Gold power stick Red power stick" In T1 GT4 Spec Lines, classify BMW M4 GT4 (G82) as follows:
A specification table follows in the original; it is not shown here.
T1 Alt. Clutch Allowance
#36606 from Hugh Stewart · Rule change · TB 24-12 (2024-12 Fastrack)
neutralT1 Spec Lines now permits 5.5 inch clutch in Engine Notes.
In T1 Spec Lines, SL# 1050, change add to Engine Notes the following: "5.5 inch clutch permitted."
T1 BOP Changes Need Updates
#36667 from Joe Rainey · Rule change · TB 24-12 (2024-12 Fastrack)
fasterT1 GT4 Spec Line 4020 restrictor opens from 44mm to 45mm, minimum weight drops to 3400 lbs.
In T1 GT4 Spec Lines, Spec Line 4020, change as follows: Performance Control: Power level 2020, 44mm 45mm SRO compliant restrictor" Min. Weight with driver (LBS): "3550 3400"
T1 Request Ford Performance Darkhorse R in T1
#37136 from Christopher Childs · Rule change · TB 24-12 (2024-12 Fastrack)
neutralMustang Darkhorse R added to T1 homologated cars at 3,250 lbs minimum with 305/315 tires, ineligible for Runoffs until 3 Super Tour events.
In T1-Homologated Cars Spec Line, classify Mustang Darkhorse R (Mustang Challenge) as follows: T1 – Homologated Cars
A specification table follows in the original; it is not shown here.
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."
T1 Car Mods for T1 Corvette under line item 1150
#37173 from Thomas Napolitano · Rule change · TB 24-12 (2024-12 Fastrack)
neutralT1 Corvette may roll or flatten wheel opening lips for tire clearance; plastic fenders may remove lips if edge thickness matches basic material.
In GCR, Section 9.1.9.1.A.2,, add the following: "It is permitted to roll under or flatten any interior lip on the wheel opening for tire clearance. Cars with plastic/composite fenders may remove any interior wheel opening lip, but the resulting material edge shall be no thinner than the basic fender material thickness. Non-metallic inner fender liners may be removed. Vents may be added to fenders."
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."
T1 Increased Bore Throttle Bodies for E46 M3 S54 Engine
#37273 from Mark Pfeffer · Rule change · TB 24-12 (2024-12 Fastrack)
fasterT1 E46 M3 S54 can now use Dinan Throttle Body #D760-3400 on 3.250L engine.
In T1 Spec Lines, E46 M3 Spec Line # 1050, add to Engine Notes the following: "Dinan Throttle Body #D760-3400 allowed on the 3.250L."
T1 T1 Parity Compared to GT4
#37170 from Tony Ave · Rule change · TB 25-02 (2025-02 Fastrack)
slowerT1 Mustang gains 125 lbs to 3600, restrictor shrinks 65mm to 60mm. Corvette gains 50 lbs to 3500, restrictor shrinks 70mm to 67mm. BMW deleted.
In T1 Spec Lines, change Weight and Restrictor Required as follows: Mustang - Spec Line 1430 Weight: "3475 3600" Restrictor Required: "65mm 60mm - FPR" Corvette Spec Line 1190 Weight: "3450 3500" Restrictor Required: "70mm 67mm - Flat Plate" In T1 Spec Lines, delete Spec Line BMW # 1190 in its entirety.
T1 Clarification of Request Approval #37273
#37399 from Mark Pfeffer · Rule change · TB 25-02 (2025-02 Fastrack)
unclearT1 E46 M3 Spec Line 1050 allows VAC Motorsports throttle body VAC-TB-S54 on 3.250L engine instead of Dinan.
In T1 Spec Lines, E46 M3 Spec Line # 1050, change Engine Notes as follows: "Dinan Throttle Body #D760-3400 VAC Motorsports #VAC-TB-S54 allowed on the 3.250L."
unclearT1 Mustang Spec 1430 restrictor opens 60mm to 65mm; Spec 1460 weight rises to 3500 lbs, restrictor 70mm; Corvette 1190 restrictor opens 67mm to 70mm; BMW 1090 restrictor narrows 40mm to 35mm; BMW 1100 weight rises to 3350 lbs.
In T1 Spec Lines, change Weight, Restrictor Required and/or Notes as follows: Mustang - Spec Line 1430: Restrictor Required: "60mm 65mm - FPR" Mustang - Spec Line 1460: Weight: "3425 3500" Restrictor Required: "70mm - FPR" Corvette Spec Line 1190: Restrictor Required: "67mm 70mm - Flat Plate"
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BMW - Spec Line 1090: Required Restrictor: "(2) X 40mm 35mm diameter hole inlet restrictor plate required" Chassis Notes: "This spec line is set to expire 12/31/25." BMW - Spec Line 1100: Minimum Weight: "3150 3350”
neutralCadillac CT4-V Blackwing added to T1 Spec Line 1115, 3564cc, 3750 lbs minimum weight.
In T1 Spec Lines, classify Cadillac CT4-V Blackwing as follows:
A specification table follows in the original; it is not shown here.
T1 Acceptance of Porsche 981 GT4 Clubsport into T1
#36664 from John Brown · Rule change · TB 25-05 (2025-05 Fastrack)
neutralPorsche 981 GT4 Clubsport added to T1 as spec line 4085, minimum weight 3100 lbs with driver.
In T1-GT4 Spec Lines, classify Porsche 981 GT4 Clubsport as follows:
A specification table follows in the original; it is not shown here.
T1 Request to Restore T1 Honda S2000 to Proper Weights
#37644 from David Mead · Rule change · TB 25-05 (2025-05 Fastrack)
fasterT1 Honda S2000 minimum weight reduced from 2950 lbs to 2900 lbs.
In T1 Spec Lines, Honda S2000, Spec Line 1530, change as follows: Minimum Weight: "2950 2900" Chassis Notes: "This spec line is set to expire as of 12/31/2025 if not represented in Majors competition in 2025."
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
T1 DCT Transmission in E46
#37964 from Matt Spicuzzi · Rule change · TB 25-05 (2025-05 Fastrack)
neutralT1 BMW E46 M3 permits BMW #GS7D36SG aftermarket sequential transmission in SL# 1060 and 1070.
In T1 Spec Lines, BMW E46 M3, add to Chassis Notes the following: SL# 1060: "BMW #GS7D36SG transmission permitted as an aftermarket sequential option." SL# 1070: "BMW #GS7D36SG transmission permitted as an aftermarket sequential option."
Applies to BMW M3 on this page: Ian Barberi
T1 Reduce E92 M3 Minimum Weight to 3050
#38092 from Shane Brown · Rule change · TB 25-05 (2025-05 Fastrack)
fasterT1 BMW M3 E92 minimum weight reduced to 3300 lbs.
In T1 Spec Lines, BMW M3 E92 (08-13), Spec Line 1100, change Min. Weight as follows: "3350 3300"
fasterT1 Mustang Darkhorse R gets 315 front and rear tyres, loses 500 lbs minimum weight to 3600.
In T1 Spec Lines, Mustang Darkhorse R (Mustang Challenge) Spec Line- 4119, change as follows: Tire size: "305 315 (f) 315(r)" Performance Control: "TBD" Min. Weight with driver (LBS): "10.5 (f) 11 (r) 3600" Chassis Notes: "Must conform to Mustang Challenge Rules. Tires conforming to Mustang Challenge rules are permitted. **This car is not eligible for the Runoffs until it has competed in 3 Super Tour events.**"
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"
T1 Keep S2000 Classification
#39344 from David Mead · Rule change · TB 25-12 (2025-12 Fastrack)
unclearUnable to summarize: letter states intent but provides no actual rule changes to S2000 specification.
In T1 Spec Lines, reinstate Spec Line # 1139, Chevrolet Corvette C6 (05-13) Includes Z51, GrandSport, Z06, Z06 Carbon, as follows: Max Displ: "LS1, LS6 OEM" Min Weight: "3200" Required Restrictor: "70mm"
What the rules allowed changed as listed; this does not say what any particular car ran.