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.
6 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
1:12.573Kevin 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
BMW M3
STU/T1
2
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 RX-3
STU
1
1:50.913Tony Rivera
1:50.913Tony Rivera
1:52.737Tony Rivera
135.2Tony Rivera
30.415Tony Rivera
32.456Tony Rivera
47.999Tony Rivera
Mazda Miata
STU
1
1:51.602Whitfield Gregg
2:02.264Whitfield Gregg
2:01.538Whitfield Gregg
116.3Whitfield Gregg
30.652Whitfield Gregg
32.263Whitfield Gregg
48.687Whitfield Gregg
Honda S2000
STU
1
1:53.640Rylan Hazelton
1:55.834Rylan Hazelton
1:53.640Rylan Hazelton
134.8Rylan Hazelton
30.582Rylan Hazelton
32.779Rylan Hazelton
49.779Rylan Hazelton
BMW 330
STU
1
1:56.492Sean Lovett
1:56.492Sean Lovett
1:57.049Sean Lovett
133.7Sean Lovett
31.816Sean Lovett
33.669Sean Lovett
50.941Sean Lovett
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
Nissan 300ZX
STU
1
1:59.183James Slechta
1:59.183James Slechta
2:00.458James Slechta
132.0James Slechta
32.882James Slechta
34.528James Slechta
51.773James Slechta
Ford Mustang
T1
1
1:59.261Pratt Cole
1:59.261Pratt Cole
98.6Pratt Cole
32.624Pratt Cole
34.661Pratt Cole
51.577Pratt Cole
Mazda MX-5
STU
2
1:59.707Oscar Jackson
2:04.115Dale Shoemaker
1:59.707Oscar Jackson
125.9Dale Shoemaker
32.339Oscar Jackson
34.219Oscar Jackson
52.330Oscar Jackson
Mazda RX-7
STU
1
2:00.248Michael Lewis
2:00.248Michael Lewis
130.4Michael Lewis
32.729Michael Lewis
34.570Michael Lewis
52.880Michael Lewis
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."
STU E&O STU NA Weight Chart.
#33737 from Eric Heinrich · Rule change · TB 23-03 (2023-03 Fastrack)
fasterSTU minimum weight chart updated: 2450cc to 2595lbs, 2600cc to 2710lbs.
neutralSTU Mazda BP5A classified at 1839 cc maximum displacement, 2023-04-01.
In STU Spec lines, classify Mazda BP5A as follows: STU Maximum Displacement (cc's) Minimum Weight Notes Mazda BP5A 1839 Chart May use engine in its entirety or specific components from the engine.
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.
#34048 from David Mead · Rule change · TB 23-06 (2023-05 Fastrack)
neutralT1 Ford Mustang S197 (05-14) reinstated with 3550 lbs minimum weight, 75mm restrictor, Voodoo engine permitted.
In T1 Spec Lines, classify Ford Mustang S197 (05-14) Includes GT, Boss302, 302S, 302R, FR500C, FR500S as follows:
A specification table follows in the original; it is not shown here.
Applies to Ford Mustang on this page: Pratt Cole
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"
STU 2022 Toyota GR Cup for STU
#34449 from Club Racing Board · Rule change · TB 23-06 (2023-05 Fastrack)
neutralToyota GR Cup and GR86 Cup (2022-) newly classified in STU at 2700 lbs with 2387 cc engine.
In STU Spec Lines, Toyota GR Cup (2022-), classify as follows:
A specification table follows in the original; it is not shown here.
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”
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."
STU 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"
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
neutralSTU Mini Cooper S SC: alternate LEAP OMICRON hood scoop LEP-OMICRON3 permitted.
In STU Spec Lines, Mini Cooper S SC with Minimum Weight 1900 and 2100, add to Notes: "Alternate LEAP OMICRON hood scoop part # LEP-OMICRON3 is permitted."
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."
neutralMercedes AMG-C63 S (2023) classified in T1 with 4000 lbs minimum weight and 3700 restrictor.
In T1 Spec Lines, classify Mercedes AMG-C63 S (2023) as follows:
A specification table follows in the original; it is not shown here.
STU RWD Turbo Disadvantage
#36255 from David Fiorelli · Rule change · TB 24-08 (2024-08 Fastrack)
fasterSTU RWD turbo cars no longer required to reduce restrictor by 1 mm from table.
In GCR, Section 9.1.4.1.H.3 - Inlet Restrictor (mm) Minimum Weight (lbs) table, change as follows: "RWD cars must reduce restrictor 1 mm from this table"
slowerSTU Mini Cooper S SC 1900 restricts to 2.565 diameter pulley; 2100 allows 2.285 diameter pulley.
In STU Spec Lines, Mini Cooper S SC, add to notes: 1900: "Stock supercharger pulley. 2.565 diameter." 2100: "JCW Pulley permitted. May run a 2.285 diameter pulley."
T1 Changes to T1 Tires for GT4 and Other Cars
#35383 from Andrew Aquilante · Rule change · TB 24-12 (2024-12 Fastrack)
unclearT1 GT4 tire sizes adjusted across ten cars: most non-DOT rear to 305/660, Audi and McLaren 305/645, Camaro and Mustang 305/680.
In T1 GT4 Spec Lines, change Tire Size as follows: Aston Martin Vantage AMR GT4 4010: "315 DOT, 305/660 Non-DOT" Audi R8 GT4 - Spec Line #4020: "315 DOT, 305/645 Non-DOT" BMW M4 GT4 - Spec Line #4030: "315 DOT, 305/660 Non-DOT" Chevrolet Camaro GT4-R- Spec Line #4035: "315 DOT, 305/680 Non-DOT" Ford Mustang GT4 - Spec Line #4040: "315 DOT, 315/680 Non-DOT" Mclaren 570S GT4 - Spec Line #4050: "315 DOT, 305/645 Non-DOT" Mercedes AMG GT4 - Spec Line #4060: "315 DOT, 305/660 Non-DOT"
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Porsche 718 Cayman GT4 CS MR - Spec Line #4070: "315 DOT, 305/660 Non-DOT" Porsche 718 GT4 RS Clubsport - Spec Line #4080: "315 DOT, 305/660 Non-DOT" Toyota Supra GR GT4 - Spec Line #4090: "315 DOT, 305/660 Non-DOT"
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.
STU 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."
STU BMW N54/N55 Engine Allowance
#37146 from Martin Sarukhanyan · Rule change · TB 24-12 (2024-12 Fastrack)
slowerSTU BMW N54/N55 turbo inlet restrictors now required per GCR definition; turbo swapping prohibited.
"Turbo inlet restrictors designed per GCR Appendix F Technical Glossary definition of “Turbo Inlet Restrictor” may be required; see table 9.1.4.1.H.h.2 3. Swapping of turbochargers between engine makes and models is prohibited. Supercharged cars may be approved on a case-by-case basis; twin turbo engines are allowed on a case-by-case basis only. Contact the Road Racing Technical Office for details. Twin turbo engines may be converted to single turbo using one of the allowed alternate turbos (see 9.1.4.1.H.3 2). Aftermarket turbocharger and supercharger kits will be allowed on a case-by-case basis.
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."
STU Audi 1.8t Wagon STU Table B
#36685 from Mike McLaughlin · Rule change · TB 25-01 (2025-01 Fastrack)
fasterSTU Audi 1.8T wagon deleted; Porsche 944 1800 weight to Chart, turbo inlet restrictor removed.
In STU Spec Lines, Table B: Alternate Vehicle and Engine Requirements, delete Audi/VW 1.8 Turbo in its entirety. In STU Spec Lines, Table B: Alternate Vehicle and Engine Requirements, Porsche 944 w/Max Displacement 1800, change as follows: Weight: "3050 Chart" Notes: "VW/Audi 1.8L 35mm turbo engine permittedinlet restrictor required."
STU Merger GT3 to STU
#37486 from Club Racing Board · Rule change · TB 25-01 (2025-01 Fastrack)
neutralSTU-GT3 reclassified as STU-GT3U effective January 1, 2026.
In STU, Table C, change STU-GT3 charge as follows: "(Effective January 1, 2026) TABLE C: STU-GT3U"
STU GT3 TCR Tire allowance
#37494 from Club Racing Board · Rule change · TB 25-01 (2025-01 Fastrack)
slowerSTU GT3 TCR gains 275-width tire option with 100 lb weight penalty, but not in A compound.
In STU, Table C, GT3 TCR, add to Notes the following: "May run DOT approved tire with maximum section width of 275 with 100 pound weight adder. May not run A compound with 275."
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."
fasterT1 Chevrolet Corvette C8 (2023-23) minimum weight reduced from 3600 lbs to 3500 lbs.
In T1 Spec Lines, Chevrolet Corvette C8 (20- 23) - Includes Z51, Spec Line # 1210, change Min. Weight as follows: "3600 3500"
T1 Camaro Gen 5 Competitive Disadvantage
#37440 from Clark Nunes · Rule change · TB 25-02 (2025-02 Fastrack)
fasterT1 Chevrolet Camaro Gen 5 restrictor increases from 75mm to 80mm flat plate.
In T1 Spec Lines, Chevrolet Camaro Gen 5 (10-15) Including SS, Z28 Spec Line 1135, change Required Restrictor as follows: "75mm 80mm - Flat Plate"
T1 Tire Changes in the Rules for GT4
#37497 from Joe Rainey · Rule change · TB 25-02 (2025-02 Fastrack)
unclearT1 Audi R8 GT4 Spec Line #4020 maximum tyre size changes to 315 DOT, 305/645, or 30/65-18 (f), 33/68-18 (r) Non-DOT.
In T1-GT4 Spec Lines, Audi R8 GT4 Spec Line #4020, change Max Tire Size as follows: "315 DOT, 305/645, or 30/65-18 (f), 33/68-18 (r) Non-DOT"
Cal Club 2025 → Cal Club 2026 2025-02-22 to 2026-02-21
STU BMW N54/N55 Engine Allowance Follow Up
#37447 from Martin Sarukhanyan · Rule change · TB 25-03 (2025-03 Fastrack)
neutralSTU BMW N54/N55 3.0L classified at Chart +3% minimum weight; N54 twin turbo not allowed.
In STU Spec Lines, Table A, classify BMW N54/N55 as follows: STU Maximum Displacement (cc's) Minimum Weight Notes BMW N54/N55 3.0 Chart +3% (DI) Short blocks, heads, and intakes may be freely swapped within these engine designations. N54 twin turbo not allowed
STU STU Mini Cooper pulley size clarification re: letter #36980
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”
STU Question About a Weight Modifier
#37782 from Peter St Pierre · Rule change · TB 25-03 (2025-03 Fastrack)
fasterSTU Honda K20C1 Turbo I4 exempted from 3% DI weight adder in Spec Lines Table A.
In STU Spec Lines, Table A, Honda K20C1 Turbo I4, add to Notes the following: "The 3% DI weight adder does not need to be applied."
STU Increase Minimum Weight
#37919 from Club Racing Board · Rule change · TB 25-03 (2025-03 Fastrack)
slowerSTU GT3U minimum weight increases 150 to 250 pounds.
In STU Spec Lines, Table C: STU-GT3U, change Minimum Weight as follows: "150 250 pounds"
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."
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
STU Wheel Size Inconsistency
#38018 from David Fiorelli · Rule change · TB 25-05 (2025-05 Fastrack)
neutralSTU wheel width rules clarified: cars ≤2,850 lbs max 8 inches, cars >2,850 lbs max 9 inches.
In GCR, Section 9.1.4.1.F.1., change as follows: "Wheels may not exceed 18 inches in diameter. or 8.0 inches in width for vehicles 2950 lbs. and under minimum allowed race weight. Vehicles over 2850 minimum allowed race weight may use a 9 inch wide wheel. Cars equal to or less than 2,850 lbs. minimum allowed race weight may not use wheels wider than 8 inches. Cars greater than 2,850 lbs. minimum allowed race weight may not use wheels wider than 9 inches."
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.**"
STU Table C: STU-GT3U Clarification
#38268 from Club Racing Board · Rule change · TB 25-05 (2025-05 Fastrack)
fasterSTU Spec Line GT3U minimum weight reduced from plus 250 to plus 225 pounds; wheel and tire options clarified with weight adjustments.
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."
STU 2.8-3.2L N/A Engine Allowances
#38007 from Ben Slechta · Rule change · TB 25-07 (2025-07 Fastrack)
unclearSTU 2.8-3.2L N/A engines now allow 245 max tire width; over 3150 lbs may run 275 with 2% weight penalty.
In GCR, Section 9.1.4.G.1, add the following: "A maximum section width of 245 is permitted. Cars over 3150 lbs. may run a 275 tire with a 2% weight adder."
STU 2006-2015 Mazda Miata Intake Manifold
#38422 from German Candelario Candelario · Rule change · TB 25-07 (2025-07 Fastrack)
neutralSTU Mazda MZR may use Goodwin 61-2510 or Gato Performance 31972 intake manifold.
In STU, Table A, Mazda MZR (LF, L3, L5), change Notes as follows: "May use Goodwin Part # 61-2510 or Gato Performance Part #31972 Intake manifold . "
STU Requesting Approval of the JDM Honda h23a
#38489 from Eric Fiest · Rule change · TB 25-07 (2025-07 Fastrack)
neutralSTU Honda JDM H23a added, 2259cc displacement, minimum weight per Chart, must meet ST engine regulations.
In STU, Table B, classify Honda JDM H23a as follows: STU Maximum Displacement (cc's) Minimum Weight Notes Honda JDM H23a 2259 Chart Must meet all ST engine regulations.
STU STU-TCR Adjustments
#38723 from Club Racing Board · Rule change · TB 25-08 (2025-08 Fastrack)
slowerSTU-TCR tire width increases to 275 with weight adder raised from 100 to 150 pounds.
In STU Spec Lines, Table C: STU-GT3U, GT3-TCR, change as follows: Remove the current TCR spec line and add the TCR spec lines from GT3 that are being removed, adding the below to the notes. "DOT approved tire with maximum section width of 245. May run DOT approved tire with maximum section width of 275 with 100 150 pound weight adder. May not run A-compound with 275. STU-TCR spitters and side valance must comply with 9.1.4.D.3.f. STU-TCR chassis ride height must comply with 9.1.4.1.A.1."
STU 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"
STU Lotus Weight Reduction E&O
#38919 from Club Racing Board · Rule change · TB 25-09 (2025-09 Fastrack)
fasterSTU Lotus Elise SC and Exige SC weight reduced from 2450 to 2250 lbs.
In STU Table B: Alternate Vehicle and Engine Allowances, change Weight as follows: Lotus Elise SC/ Lotus Exige SC: "2450 2250"
STU Non-Homologated Engine Swaps - Specifically K24A2 w/ Honda CRZ
#38746 from William Rori · Rule change · TB 25-09 (2025-09 Fastrack)
slowerSTU Honda K24 engine swap weight increases by 2% effective November 1, 2025.
In STU Spec Lines, Table B: Alternate Vehicle and Engine Allowances, Honda K24, change Weight as follows: "(Effective 11/1/2025) Chart + 2%"
STU Turbo Inlet Restrictor Table
#38961 from John Weisberg · Rule change · TB 25-12 (2025-12 Fastrack)
slowerSTU 36mm restrictor allows 2830 lbs (up 10 lbs from 2820); 37mm allows 2980 lbs (down 5 lbs from 2985).
In GCR, Section 9.1.4.H.3, change chart as follows:
A specification table follows in the original; it is not shown here.
STU 275 Tire Rule
#38983 from Peter Federlin · Rule change · TB 25-12 (2025-12 Fastrack)
slowerSTU cars over 3150 lbs lose 275-tire option with 2% weight adder.
In GCR, Section 9.1.4.G.1., change as follows: "A maximum section width of 245 is permitted. Cars over 3150 lbs. may run a 275 tire with a 2% weight adder."
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, Honda S2000, change as follows:
STU STU Honda Engine weight penalty
#39375 from Super Touring Committee · Rule change · TB 25-12 (2025-12 Fastrack)
unclearT1 Spec Line restrictor changes from 70mm flat plate to unspecified new specification.
In T1 Spec Line, Spec line # 1132, change Restrictor as follows: "70mm - Flat Plate"
STU Request for Permission on Aftermarket Turbo Kit and Intake
#39529 from John Grim · Rule change · TB 26-01 (2026-01 Fastrack)
fasterSTU Mazda MZR (LF, L3, L5) Turbo classified; Jack Spania Racing 70 mm intake manifold and Fab9 Tuning bottom-mount turbo kit approved.
In STU Spec Lines, Table A: Alternate Vehicle and Engine Allowances, Mazda MZR (LF, L3, L5), change Notes as follows: "Short blocks, heads, and intakes may be freely swapped within these engine designations. May use Goodwin Part # 61- 2510 or, Gato Performance Part #31972 or Jack Spania Racing 70 mm sheet-metal aluminum Intake manifold. Must use stock throttle body or Acura part number 16400-PND-A17." In STU Spec Lines, Table A: Alternate Vehicle and Engine Allowances, classify Mazda MZR (LF, L3, L5) Turbo as follows: STU Maximum Displacement (cc's) Minimum Weight Notes Mazda MZR (LF, L3, L5) Turbo
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Varies Chart Short blocks, heads, and intakes may be freely swapped within these engine designations. May use Jack Spania Racing 70 mm sheet-metal aluminum Intake manifold. Must use stock throttle body or Acura part number 16400-PND- A17. Fab9 Tuning bottom-mount turbo kit approved with one of the STU approved Turbos.
T1 LS1 into Corvette C6 Spec Line Request
#39716 from Danny Kellermeyerhttps://crbscca.com/secu · Rule change · TB 26-02 (2026-02 Fastrack)
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.