GT2 at Road America

2020-12-01 GT2 Request for Bigger Engine in Plymouth Breeze

#29380 from Gregory Bailiff · Rule change · TB 20-12 (2020-12 Fastrack)

In GT2, classify the Chrysler/Dodge/Plymouth engine as follows:
GT2 Engines - CHRYSLER/DODGE/PLYMOUTH
Engine
Family
Engine Type Bore x
Stroke
(mm)
Disp.

2021-01-01 GT2 Request change to engine firing order rule

#29742 from Tom Patton · Rule change · TB 21-01 (2021-01 Fastrack)

In GT2/ST, Spec Lines, Ford Mustang/ Thunderbird (Boss 302), add to Notes as follows:
"Firing Order is Unrestricted" for this engine."

2021-01-01 GT2 Request E-46 BMW M3 balance of performance

#29833 from Nathan McBride · Rule change · TB 21-01 (2021-01 Fastrack)

In GT2/ST, Spec Lines, BMW E46 M3 & E36 / BMW Z3 / BMW 5000cc V8, change weight as follows:
"2600 2500"

2021-02-01 GT2 ABS Restrictions

#30064 from Grand Touring Committee · Rule change · TB 21-02 (2021-02 Fastrack)

In GT2, GCR section 9.1.2.F.7.j.1, add the following:
"ABS braking systems are allowed if shown on the individual Spec Line."

2021-02-01 GT2 RM 21-01 C6 & C7 clarification

#30192 from SCCA Staff · Rule change · TB 21-02 (2021-02 Fastrack)

In GT2/ST, clarify C6 and C7 spec lines with Race Memo 20-01.
ISSUED: January 05, 2021 NUMBER: RM 21-01
FROM: Board of Directors
TO: All Participants
SUBJECT: GT2/ST Corvette year/model clarifications Letter #30192
To address Errors & Omissions in the January 2021 Fastrack letter #30029, spec lines depicting the model/year/engine
configurations for the C6 and C7 Corvette in GT2/ST need to be split for clarification.
GT2/ST Max. Displacement Min.

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

2021-03-01 GT2 GT2-ST CORVETTE CHANGES

#30029 from Club Racing Board · Rule change · TB 21-01 (2021-01 Fastrack)

In GT2-ST, Spec Lines, classify Chevrolet Corvette (-2013) as follows:
GT2-ST Maximum Displacement Minimum Weight Restrictor Notes
Chevrolet Corvette
(-2013)
L76
5967
3000 73 mm Flat Plate GM L76. May use the
LSX cast iron block with

2021-03-01 GT2 Request underfloor clarification

#30121 from Kevin Allen · Rule change · TB 21-03 (2021-03 Fastrack)

In GCR, Section 9.1.2.F.7.b.15.E.3., remove the following:
"The rear engine opening must start after the rear edge of the rear wheel opening."

2021-03-01 GT2 29742 Change new wording to read as:

#30329 from Grand Touring Committee · Rule change · TB 21-03 (2021-03 Fastrack)

In GT2 Spec Lines, Ford Mustang/ Thunderbird (Boss 302), change Notes as follows:
"Firing order is unrestricted" for this engine. Optional engine firing order of later versions of SBF family (302) 1,3,7,2,6,5,4,8."

Applies to Ford Mustang on this page: John Atwell, Brad McAllister, Jared Odrick, Jack Stanford, Robert Kacprowicz, Stephen Sauers, Ray Mason, Frank Widmoser, Ike Keeler, Kevin Rich, Timothy Gray

2021-04-01 GT2 GT2 tiger firing order

#30421 from Grand Touring Committee · Rule change · TB 21-04 (2021-04 Fastrack)

In GT2 Engines - SUNBEAM, change as follows:
"Optional engine firing order of later versions of SBF family (302) 1,3,7,2,6,5,4,8.
May use optional firing order of later version of SBF Family (Boss 302) 1,3,7,2,6,5,4,8"

2021-07-01 GT2 Porsche Cayman Engine Modification and Engine Request

#30472 from Marvin Epps · Rule change · TB 21-07 (2021-07 Fastrack)

In GT2-ST, Porsche Cayman (05-15), change Notes as follows:
"65 75mm Flat Plate Restrictor @ 2700lbs. No variable valve timing and no direct injection. 4.2 70mm flat plat restrictor 2700
lbs."

2021-07-01 GT2 Request weight clarification Viper CC

#30565 from Scotty B White · Rule change · TB 21-07 (2021-07 Fastrack)

In GT2/ST Spec Lines, Dodge Viper, incl Comp Coupe, ACR/ ACR-X - 8300, change Min. Weight as follows:
"3275
VRL Spec -100lbs"

2021-07-01 GT2 Variance, 2021 TA2 Rules vs GCR Appendix L

#30641 from Scott Sanda · Rule change · TB 21-07 (2021-07 Fastrack)

In GCR, Appendix L., add the following:
"APPENDIX L: 2013 TA2 TECHNICAL REGULATIONS
Cars must comply with Appendix L. (prior generation TA2 rules) or current Trans Am rules at 2930 lbs. Tire make/size are free."

2021-08-01 GT2 Request the 04-06 Pontiac GTO WC Car Be Added to the GT2/ST Chart

#30339 from Keith Kimberly · Rule change · TB 21-08 (2021-08 Fastrack)

In GT2/ST, classify World Challenge Pontiac GTO (04-06) as follows:
GT2-ST Maximum Displacement Minimum Weight Restrictor Notes
04-06 World Challenge
Pontiac GTO
6062 3000 Must be prepared to
World Challenge Pontiac
GTO rules. Competitor
must have build rules in

2021-08-01 GT2 Request to Update GTA Obsolete Part Numbers

#30615 from Butch Kummer · Rule change · TB 21-08 (2021-08 Fastrack)

In GCR, Section 9.1.2.G.16., change as follows:
"0-80541-1 0-80541-2"
In GCR, Section 9.1.2.G., Appendix Z 5.a. change as follows:
"0-80541-1 0-80541-2"
In GCR, TA2 Appendix B.3.4, change as follows:
"#6010 6014X"

2021-08-01 GT2 GTX class correction to GT2/ST

#30973 from Grand Touring Committee · Rule change · TB 21-08 (2021-08 Fastrack)

In GTX Spec Lines, eliminate GRULLON line in its entirety.
In GT2/ST, classify GRULLON as follows:
GT2-ST Maximum Displacement Minimum Weight Restrictor Notes
GRULLON GT 2.0L
2003-2006 Acura K20
2350 lbs. Unrestricted Must comply with factory
specifications, must have
factory spec manual in

2021-09-01 GT2 Correct letter 30565 GT2/ST

#31088 from Grand Touring Committee · Rule change · TB 21-09 (2021-09 Fastrack)

In GT2/ST Spec Lines, Dodge Viper, incl Comp Coupe, ACR/ACR-X8300, change weight as follows:
"3275 VRL Spec Front Fascia -100lbs"

2021-10-01 GT2 Turbo Request for 13B Engine

#30656 from Luis Rivera Jr · Rule change · TB 21-10 (2021-10 Fastrack)

In GT2 Engines - Mazda Spec Lines, 13B, add to Notes as follows:
"Part# EFR 70/76 Turbocharger-42mm Turbo Inlet Restrictor (TIR), Street Port only @ 2280lbs."

2021-10-01 GT2 Request car classification

#31032 from Bryan Scheible · Rule change · TB 21-10 (2021-10 Fastrack)

In GT3 Engines - VOLKSWAGEN, classify Fun Cup Beetle EVO3 as follows:
GT3 Engines - VOLKSWAGON

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

2022-01-01 GT2 Restrictor Clarification for 2015 Cayman

#31451 from Marvin Epps · Rule change · TB 22-01 (2022-01 Fastrack)

In GT2-ST Spec Lines, Porsche Cayman (05-15) , change Notes as follows:
"4.0L 70mm Flat Plate Restrictor Throttle Body Restrictor (TBR) @ 2700lbs. No variable valve timing and no direct injection. 4.2
70mm flat plat restrictor Throttle Body Restrictor (TBR) @ 2700 lbs."

2022-02-01 GT2 GT2/ST Porsche Cayman #31451 correct TBR size error

#31991 from Grand Touring Committee · Rule change · TB 22-02 (2022-02 Fastrack)

In GT2-ST Spec Lines, Porsche Cayman (05-15), change Notes as follows:
"4.0L 70 75mm"

2022-03-01 GT2 Request to Classify Ginetta G40 in GT2

#31597 from Richard Gray · Rule change · TB 22-03 (2022-03 Fastrack)

In GT2 Cars - Ginetta, classify Ginetta G40 as follows:
GT2 Cars - GINETTA
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Ginetta G40 2002-

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

2022-03-01 GT2 2021 Supra GR GT4

#31737 from Dominic Starkweather · Rule change · TB 22-03 (2022-03 Fastrack)

In GT2-ST, classify Toyota Supra GT4 as follows:
GT2-ST Maximum Displacement Minimum Weight Restrictor Notes
Toyota Supra GT4 3000L 3000 Per factory Spec. Must have GT4 rules in
possession at all race
events.

2022-03-01 GT2 Proposed Technical Bulletin

#31900 from Alex McBain · Rule change · TB 22-03 (2022-03 Fastrack)

In GT2/ST Spec Lines, Porsche 944/924, change Notes as follows:
"May use Jayco super 50 ERC 76/70 Turbo."

2022-05-01 GT2 Typo in rules for shocks

#32308 from Richard Gray · Rule change · TB 22-05 (2022-04 Fastrack)

In GT-2, 3, LITE CATEGORY SPECIFICATIONS, GCR Section 9.1.2.F.7.c.11., change as follows:
"Shock absorbers: It is not permitted to alter the number of shock absorbers. The make of shock absorber is free and its points of
attachment may be moved."

2022-05-01 GT2 additional response to letters #31898 & 32083

#32424 from Grand Touring Committee · Rule change · TB 22-05 (2022-04 Fastrack)

In GT2 Spec Lines, Engines - PORSCHE, add to Notes as follows:
SOHC - 100 x 78.9: "2V only: May use Borg Warner EFR 76/70 42mm SIR @2280 lbs. Alt.4 valve head #944 104 013 03 NOTE: 4
valve head is not permitted to use with turbo allowance."
SOHC - 104 x 78.9: "2V only: May use Borg Warner EFR 76/70 42mm SIR @2330 lbs."
SOHC - 95.0 x 70.4: "2V only: May use Borg Warner EFR 76/70 42mm SIR @2405 lbs."
In GT2 Spec Lines, Engines - PORSCHE, change as follows:
Bore x Stroke: “95.0 x 70.4 104.0 x 88.0”
Weight: “1950 2090”

2022-08-01 GT2 Information requested for carbon roofs on BMW E36/E46 cars in GT2

#32682 from Tony Colicchio · Rule change · TB 22-08 (2022-08 Fastrack)

In GT2/ST Spec Lines, add to Notes the following:
"Lang Racing
E46 carbon roof part number E46-2DR-CFROOF
2M Automotive
E46 coupe SKU: 2ME46CR1x1 (coupe 1x1 weave)
E46 coupe SKU: 2ME46CR2x2 (coupe 2x2 weave)
E46 sedan SKU: 2ME46SR1x1 (sedan 1x1 weave)
E46 sedan SKU: 2ME46SR2x2 (sedan 2x2 weave)

2022-08-01 GT2 Request to Allow the 95mm S54 BMW Crankshaft in GT2-ST

#32698 from Ian Barberi · Rule change · TB 22-08 (2022-08 Fastrack)

In GT2/ST Spec Lines, BMW E46 M3 & E36 / BMW Z3 / BMW 5000cc V8, add to Notes the following:
"95mm S54 crankshaft @ +150lbs. Lang Racing part# S54-95mm-Stroker-Crk."

2022-08-01 GT2 Request to classify Audi R8 FIA GT4 to GT2

#32805 from Tony Ave · Rule change · TB 22-08 (2022-08 Fastrack)

In GT2 Spec Lines, classify AUDI R8 GT4 as follows:
GT2 Maximum
Displacement Minimum Weight Restrictor Notes
AUDI R8 GT4 5.2L 3000 Per factory
specs.
Must have GT4 rules in possession
at all race events.

2022-09-01 GT2 Tail lights on all GT category race cars.

#32799 from John Mills · Rule change · TB 22-09 (2022-09 Fastrack)

In GT, GCR Section 9.1.2.F.7.a.6:
"Glass and/or plastic headlights, front parking lights, front signal lights, lenses, and bulbs shall be removed. Headlight openings
shall be covered with a wire mesh screen or panel having the same contour as the original lens, mounted so that the headlight
bezel/rim remains in place, maintaining the standard appearance of the Production automobile. Side marker light assemblies
shall be removed and the resulting openings covered with a plate whose dimensions do not exceed those of the original parts;
side marker lights that are an integral part of the taillight assembly cannot be removed. Other lighting parts and operating
mechanisms may be removed. In the case of pop-up headlights, the entire assembly may be removed and the opening covered
with a screen or plate (as above, without the headlight bezel/rim requirement) which provides a stock appearance. It is not

2022-09-01 GT2 Addendum to letter #32514 Ginetta GTA G56

#33076 from Grand Touring Committee · Rule change · TB 22-09 (2022-09 Fastrack)

In GT2 Spec Lines, classify Ginetta GTA G56 as follows:
GT Cars - Ginetta
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Ginetta G56 GTA 2021-22 2dr Coupe RWD 96.6” Weight 2600lbs. 3.7L Ford V6 (Sealed)

2022-10-01 GT2 Request for C5/C6 Corvette Restrictor Size Review

#32982 from Jorge A Nazario · Rule change · TB 22-10 (2022-10 Fastrack)

In GT2/ST Spec Lines, Chevrolet Corvette (-2013), GM L76 5967, change Restrictor as follows:
"73 4mm"

2022-11-01 GT2 Allow the MAShaw Body Kit on the GT2/ST Spec Line for BMW E36/E46

#32447 from Ian Barberi · Rule change · TB 22-11 (2022-11 Fastrack)

In GT2/ST Spec Lines, BMW E46 M3 & E36 / BMW Z3 / BMW 5000cc V8, change Notes as follows:
"In the US, MA Shaw a company that also builds BMW body kits has both E36 and E46 carbon/ composite door offerings
E36/E46: https://www.mashaw.com/html/product_info_BMW.html.
-BMW E-36 PTG style wide body kit
-M-3 front bumper with splitter
-Front fenders
-Side rockers
-Rear flairs

2022-12-01 GT2 GT2 (TA2)/GTA Part Number Update

#33315 from Butch Kummer · Rule change · TB 22-12 (2022-12 Fastrack)

In GCR Appendix L-TA2 rules, Addendum A, change A.2. as follows:
"The throttle body must be either a GM 90mm, electronic, part #1257 → 0790, or Edelbrock 90mm, mechanical, part 33869 or
#3870."
In GTA, GCR Section 9.1.2.G.3., change as follows:
"The throttle body must be either a GM 90mm, electronic, part #1257 → 0790, or Edelbrock 90mm, mechanical, part 33869 or
#3870."

2022-12-01 GT2 Ginetta G56 GTA - Optional Wheels

#33357 from Baer Connard · Rule change · TB 22-12 (2022-12 Fastrack)

In GT Cars - Ginetta Spec Lines, Ginetta G56 GTA, add to Notes as follows:
"Optional: May use 18” x 9’’ and 18” x 10” Wheels."

2023-01-01 GT2 Request Permission to Use a Substitute Turbo

#33337 from Evan Slater · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2 Engines - Porsche, Engine Type SOHC with 2478 Displacement, change Notes as follows:
"2V only: May use Borg Warner EFR 76/70 42 44mm SIR TIR or Garrett G30-660 w/44mm TIR @2280 lbs."
In GT2 Engines - Porsche, Engine Type SOHC with 2681 Displacement, change Notes as follows:
"2V only: May use Borg Warner EFR 76/70 42 44mm SIR TIR or Garrett G30-660 w/44mm TIR @2330 lbs."
In GT2 Engines - Porsche, Engine Type SOHC with 2992 Displacement, change Notes as follows:
"2V only: May use Borg Warner EFR 76/70 42 44mm SIR TIR or Garrett G30-660 w/44mm TIR @2405 lbs."

2023-01-01 GT2 Request to Reduce Restriction on C7 GT2 Corvette

#33342 from Joe Aquilante · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2-ST, Chevrolet Corvette (14-19) w/ Maximum Displacement L76 5967, change Restrictor as follows:
"70 73"

2023-01-01 GT2 Toyota 4A-F and 4A-FE 1.6L DOHC 16V Engine Request

#33415 from Scott Schick · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2 Spec Lines, Engines - Toyota, add the following Spec Line:
Engines - TOYOTA
Engine
Family
Engine Type Bore x

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

2023-01-01 GT2 GT2 Mazda 13b turbocharger part # update

#33437 from Grand Touring Committee · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2 Spec Lines, Engines - MAZDA, 13B Street / Bridge Port, change Notes as follows:
"Part# EFR 70/76 76/70 Turbocharger-42 46mm"

2023-01-01 GT2 GT2-ST BMW E36/46 spec line remove

#33610 from Grand Touring Committee · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2-ST Spec Lines, BMW E36/46, add to Notes as follows:
"In the US. MA Shaw a company that also builds BMW body kits has both E36 and E46 carbon/composite door offerings E36/46:
https;//www.mashaw.com/html/product_info_BMW.html.
-BMW E-36 PTG style wide body kit
-M-3 front bumper with splitter
-Front fenders
-Side rockers
-Rear flairs

2023-01-01 GT2 GT3 Choke option effective 1-01-2023

#33669 from Grand Touring Committee · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2, 3, LITE Category Specifications, GCR Section 9.1.2.F.13.m., add the following:
" For GT3 only:
1. As an option, induction system "Chokes" may be used where a SIR is required.
Said chokes shall be fitted to each barrel of carburetor/throttle body and all airflow into engine must pass through them. Choke
size will be the same as listed SIR unless noted.
This option is for normally aspirated cars with SIRs only and does not apply to turbo cars with TIRs."

2023-01-01 GT2 GT3 2.0L choke/weight option

#33670 from Grand Touring Committee · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2, 3, LITE Category Specifications, GCR Section 9.1.2.F.13.m., add the following:
“2. All 2.0 liter 4-valve non-turbo engines currently listed in GT3 shall be permitted to run without any restriction (SIR or chokes)
at 2060lbs.”

2023-01-01 GT2 BOP adjustment for GT2 & GT2-ST

#33681 from Grand Touring Committee · Rule change · TB 23-01 (2023-01 Fastrack)

In GT2, Porsche 991.1 GT3 Cup, make changes as follows:
70 72mm Throttle body Restrictor (TBR)
ABS is allowed with a 100lb. penalty.
In GT2, Porsche 991.2 GT3 Cup, make Changes as follows:
3100 3000lbs. 65 67mm Throttle Body Restrictor (TBR)
In GT2, Porsche 996/997.1 GT3 Cup, make Changes as follow:
ABS is allowed with a 100lb. penalty.
In GT2, Porsche 997.2 GT3 Cup, make changes as follows:

2023-02-01 GT2 GT2 Mazda 13B Turbo

#33729 from Grand Touring Committee · Rule change · TB 23-02 (2023-02 Fastrack)

In GT2 Spec Lines, Engines - Mazda, 13B Street / Bridge Port, change Notes as follows:
"Part# EFR 76/70 BW7670 or Garrett G30-660 Turbocharger-46mm Turbo Inlet Restrictor (TIR), Street Port only @ 2280lbs."

2023-04-01 GT2 Adding Ginetta G56 GTA Factory ProTune for GT2 Class

#33825 from Robert Mueller · Rule change · TB 23-04 (2023-04 Fastrack)

In GT Cars - Ginetta, Ginetta G56 GTA, add to Notes as follows:
"May use Factory installed ProMap ECU Map."

2023-05-01 GT2 Request to class 2011 Porsche Cayman S

#33771 from Coyote Black · Rule change · TB 23-05 (2023-05 Fastrack)

In GT Cars - Porsche, classify Porsche Cayman ‘S’ as follows:
GT Cars - Porsche
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Porsche Cayman ‘S’ 09-12 2 dr. Coupe RWD 95.08 3.4L No PDK Transmission

2023-05-01 GT2 Please classify Fields Cardinal V8

#33784 from James Rogersn · Rule change · TB 23-05 (2023-05 Fastrack)

In GT Spec Lines, GT1 Cars - Fields Cardinal, classify Fields Cardinal V8 as follows:
GT1 Cars – Fields Cardinal
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Fields Cardinal V8 2023 2 Dr. RWD 92.0 Roll Cage MUST be modified to comply with

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

2023-07-01 GT2 appendix letter #33635

#34206 from Ian Barberi · Rule change · TB 23-06 (2023-07 Fastrack)

In GT2-ST Spec Lines, BMW E46 M3 & E36 / BMW Z3 / BMW 5000cc V8, change notes as follows:
"The 3.4 liter 6 cyl. (87.0 bore x 93.0 stroke) is permitted at 2575lbs. 4.0L V8 permitted at 2900lbs. 4.5L V8 permitted at 2950lbs.
5.0L V8 permitted at 3000lbs. Flossman body kit permitted as found at http://www.racingpartsbmw.de/start/eng/start.htm.
Trans Am SGT spec: Regular shifter 3000 lbs., paddle shifter plus 150 lbs. 95mm S54 crankshaft @ +150lbs. Lang Racing part#
S54-95mm-StrokerCrk.
S54 engine is permitted a 97mm stroke crankshaft (part #VAC-SC-S54) @2800lbs."

2023-07-01 GT2 Remove Weight and Restrictor Penalty for Corvette C7 Body

#34342 from Jorge A Nazario · Rule change · TB 23-06 (2023-07 Fastrack)

In GT2/ST, Chevrolet Corvette (2014-2019) change as follows:
Restrictor: "73 7mm flat plate"

2023-09-01 GT2 GT2 Mazda 20B 3 rotor ENO

#34765 from Grand Touring Committee · Rule change · TB 23-09 (2023-09 Fastrack)

In GT2 Spec Lines, Engines - MAZDA, combine both 20B to one spec lines and keep the following:
Weight: "2500 2280"
Notes: "Must run +100 lbs. for Grand Am transaxle and independent rear suspension. Must comply with all other GT2 rules."

2023-10-01 GT2 Late E & O

#34966 from Scotty B White · Rule change · TB 23-10 (2023-10 Fastrack)

RM 23-10 GT2-ST Dodge Viper, incl Comp Coupe, ACR/ACR-X VRL Front Fascia
As an Errors and omissions fix to what was originally intended for these cars, the Club Racing Board and Board of Directors have
approved the following:
In GT2-ST, Dodge Viper, incl Comp Coupe, ACR/ACR-X add VRL front fascia -100lbs to all Spec Lines.

2023-12-01 GT2 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules

#34453 from David Gomberg · Rule change · TB 23-12 (2023-12 Fastrack)

from the current (or before) Table of Contents (TOC), to what is shown in the after TOC.
GTL spec lines will now be contiguous with GT2 and 3 spec lines.
GTA category and spec lines will be moved and renumbered behind GTL. GTA Section will not change but page numbers will, (as
shown in Red italics).
9.1.2.F. GT-2, 3, LITE Category Specifications 314
GT2 Cars 327
GT2/ST 341
GT3 Cars 348

2024-01-01 GT2 Dodge Viper Gen 3 hybrid Kit Update Request

#35200 from Sean McCann · Rule change · TB 24-01 (2024-01 Fastrack)

In GT2-ST Spec Lines, Dodge Viper, incl Comp Coupe, ACR/ ACR-X change NOTES as follows:
8300 OEM: "Stock OEM engine. Engine long block, valve train, and intake system must meet stock, shop manual specifications.
Hybrid update including Mopar Performance Part #P5156137. May use Mopar part #5038554AF (Gen 5 Intake Manifold
manifold allowed with (2) 55mm flat plates) and 8.4L mechanical throttle body allowed. VRL Front Fascia -100lbs."
8300: "Hybrid update including Mopar Performance Part # P5156137, Mopar part #5038554AF manifold and 8.4L mechanical
throttle body allowed using (2) 50 45mm flat plate restrictors. VRL Front Fascia –100lbs."
8400: "Intake and Throttle Body from Mopar Performance Part # P5156137allowed using (2) 50 45mm flat plate
restrictors. , Mopar part #5038554AF manifold (Gen 5 Intake Manifold allowed with (2) 50mm flat plates) VRL Front Fascia -

2024-02-01 GT2 Rear Blade Spoiler Clarification

#35261 from Butch Kummer · Rule change · TB 24-02 (2024-01 Fastrack)

In GCR Section 9.1.2.G (GTA Category Specifications), change as follows:
“9.1.2.G.III.I
The single-plane rear spoiler must be mounted at an angel angle from 50 to 75 degrees (perpendicular to the ground
being 90 degrees) and may not extend beyond the rear bumper when viewed from directly above the rear
bumper. Spoilers must be a minimum of .063 aluminum or Lexan and may vary in overall height to match the contours
of the bodywork. The rear spoiler dimensions shall not exceed 59.0 inches wide by 5.0 inches in height, (measured on
the material surface) , or 295.0 square inches total surface area. Braces to prevent spoiler deflection are allowed, but
may serve no other purpose.”

2024-02-01 GT2 REDUCE C6 CORVETTE WEIGHT WITH OEM 7 LITER ENGINE REDUCE BY 150LB

#35385 from Mike McGinley · Rule change · TB 24-02 (2024-02 Fastrack)

In GT2/ST Chevrolet Corvette 7011 OEM change weight as follows:
“3275 3125“

2024-02-01 GT2 GT Direct Injection allowance and rules

#35437 from Grand Touring Committee · Rule change · TB 24-02 (2024-01 Fastrack)

In GCR, Section 9.1.2.F.7.5.E. change as follows:
“Direct Injection is not permitted only if it came OE and must be installed using only OE high pressure pump(s), hard and
soft hoses and injectors.”

2024-02-01 GT2 GT2/3 remove Direction Injection not allowed in Spec line notes

#35439 from Grand Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)

In GT2/3 modify Spec Line notes as follows:
GT2:
Nissan: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
GT3:
Mazda: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
Mitsubishi 4G93: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E. ”
Nissan QR25DE/DD 1988cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”
Nissan QE25DE/DD 2489cc: “Direct Injection not permitted, may be used per 9.1.2.F.7.5.E.”

2024-03-01 GT2 Classify Corvette C8 (2020- ) into GT2/ST

#33759 from Andrew Aquilante · Rule change · TB 24-03 (2024-03 Fastrack)

In GT2 Spec Lines, classify Chevrolet Corvette C8 (20-) as follows:
GT2-ST Maximum Displacement Minimum Weight Restrictor Notes
Chevrolet Corvette C8
(20-)
6162 3300 71mm -
Flat Plate
LT2 engine.

Applies to Chevrolet Corvette on this page: Andrew Aquilante, Jorge Nazario, Michael Quattlebaum, Dominic Starkweather, Lou Gigliotti, Oli Thordarson

2024-03-01 GT2 Requesting classification for a 2015 Mitjet ST in GT2

#35408 from Jim Froula · Rule change · TB 24-03 (2024-03 Fastrack)

In GT2 Spec Lines, GT Cars - MITJET ST, classify MITJET ST as follows:
GT Cars – MITJET ST
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
MITJET ST 2015 RWD 94.5 Must run per VTS specifications. Must have

2024-05-01 GT2 Request for Spec Line 1010 Reconsideration

#35009 from Kristofer Olson · Rule change · TB 24-05 (2024-05 Fastrack)

In GT2-ST Spec Lines, Acura NSX, change as follows:
Minimum Weight: "2700 3000"
Restrictor: "43 45mm TIR"

2024-05-01 GT2 Request to Eliminate the FPR from the Corvette (-2013) with LS2

#35878 from Michael Quattlebaum · Rule change · TB 24-05 (2024-05 Fastrack)

In GT2-ST Spec Lines, Chevrolet Corvette (14-19), change Restrictor as follows:
"78 80mm flat plate"

2024-07-01 GT2 GT2-ST Rule Clarification

#36093 from Dominic Starkweather · Rule change · TB 24-07 (2024-07 Fastrack)

In GCR Section, Appendix K. 2012.M2, add the following:
"After market replacement differential housings are permitted as long as they are an exact equivalent."

2024-07-01 GT2 GT4 cars may run in GT2-ST

#36235 from Grand Touring Committee · Rule change · TB 24-07 (2024-07 Fastrack)

In 9.1.2. GT2 Spec Lines, GT3 Cars, change Note as follows:
"Note: All GT4 cars are permitted to compete in GT2-ST provided they use a factory supplied power stick or Pro Series
required restrictor. Must have GT4 rules in possession at all race events. Cars must comply with 2012 STO rules as
stated in Appendix K of the GCR. Engine Displacements in this table are nominal. Each competitor shall have available
definitive documentation (e.g., factory manual) of the original displacement for the engine used. Slicks allowed on all
GT2/ST cars with a 100-pound weight penalty."

2025-01-01 GT2 Panoz Esperante GTS BOP

#36686 from Brian Goldburg · Rule change · TB 25-01 (2025-01 Fastrack)

In GT2 SPEC LINES, GT Engines - PANOZ, classify 2013-2016 Ford EcoBoost Twin Turbo as follows:
GT Engines – PANOZ
Engine
Family
Engine Type Bore x
Stroke
(in.)
Disp.

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

2025-01-01 GT2 Correct language regarding OEM Areo Devices

#37137 from Christopher Childs · Rule change · TB 25-01 (2025-01 Fastrack)

In GCR, Section APPENDIX L. 2013 TA2 TECHNICAL REGULATIONS, B.2.c., change as follows:
"B. Aerodynamic Devices
2. Rear wing
c. The entire rear wing assembly, including the end plates and any Gurney flap, shall be mounted level
with, or below, the peak of the roof. OEM aerodynamic devices do not need to adhere to the height rule."

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

2025-01-01 GT2 GT2 Sunbeam Tiger Alternate Carburetor

#37198 from Tom Patton · Rule change · TB 25-01 (2025-01 Fastrack)

In GT2 Spec Lines, GT Engines - SUNBEAM, add to Fuel Induction as follows:
"Carburetors(s) Holly 650 cfm PN #80541-1 and PN #80541-2"

2025-02-01 GT2 GT2/ST - Remove Aftermarket/Racing ABS penalty

#36538 from Jorge A Nazario · Rule change · TB 25-02 (2025-02 Fastrack)

In GCR, Appendix K. 2012 STO Rules, O.9., change as follows:
"May run OEM ABS or convert to an aftermarket ABS controller with 100 50 lb. weight penalty."

2025-03-01 GT2 Hood Bulge allowed

#37000 from Gordon Leslie · Rule change · TB 25-03 (2025-03 Fastrack)

In GT2 Spec Lines, GT2 Cars - PONTIAC, Fiero, change as follows:
Drive-line: "FWD RWD"
Add to Notes: "Hood bulge permitted as requested for front engine relocation only."

2025-03-01 GT2 OEM Wing Adjustment

#37590 from Christopher Childs · Rule change · TB 25-03 (2025-03 Fastrack)

In GCR, Section APPENDIX L. 2013 TA2 TECHNICAL REGULATIONS, B.2.c., change as follows:
"The entire rear wing assembly, including the end plates and any Gurney flap, shall be mounted level with, or below, the peak of
the roof. OEM aerodynamic devices do not need to adhere to the height rule."
In GCR, Section APPENDIX K. 2012 STO GENERAL TECHNICAL REGULATIONS, D.4.b., add the following:
"Factory wings, and spoilers, and roof vortex generators are permitted, but must be removed if an approved aftermarket wing is
installed. OEM aerodynamic devices do not need to adhere to the height rule."

2025-08-01 GT2 Rear Deck Lid for Older Air-Cooled Porsche

#38506 from Justin Erion · Rule change · TB 25-08 (2025-08 Fastrack)

In GT2 Spec Lines, GT2 Cars-Porsche, 911 Coupe & Targa., add to Notes the following:
"Porsche 911-based race cars (911,963,994), the use of the 993 3.8 RSR rear deck lid/spoiler is permitted. Aftermarket
reproductions of the original Porsche Motorsports deck lid provided they faithfully replicate OEM dimensions and functionality,
are acceptable for use."

2026-01-01 GT2 Additional Body Options to Replace Older Stock Car Bodies

#39086 from Samuel Daniels · Rule change · TB 26-01 (2026-01 Fastrack)

In GCR, Section 4.8.4.2.1., add the following:
"Cars in the class must use 1997, through current year, commercially available stock car bodywork. The following make/model
bodies are allowed:
1. Cadillac CTS
2. Chevrolet Impala
3. Chevrolet Malibu
4. Chevrolet Monte Carlo
5. Chevrolet SS

2026-01-01 GT2 GT3 Turbo to GT2?

#39365 from Chris Edens · Rule change · TB 26-01 (2026-01 Fastrack)

In GT2 Spec Lines, Engines - MAZDA, classify Engine Family BP as follows:
GT2 Engines - MAZDA
Engine
Family
Engine Type Bore x Stroke
(mm)
Disp.
(CC)

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

2026-01-01 GT2 Tech Bulletins for GT2 and GT2-ST

#39537 from Grand Touring Committee · Rule change · TB 26-01 (2026-01 Fastrack)

In GT2 Spec Lines, GT2 Cars – Porsche, classify 992.1 GT3 Cup as follows:
GT2 Cars – Porsche
Model Year Body
Style Driveline Wheel Base Notes
992.1
GT3 Cup
(22-25) 2 Dr RWD 4.0L flat six. 3250lbs. w/60mm Throttle Body Restrictor (TBR).
Cars must be prepared in accordance with the appropriate

2026-02-01 GT2 Allow Larger Air Cooled Engines in Porsche 911 GT2

#39249 from Justin Erion · Rule change · TB 26-02 (2026-02 Fastrack)

In GT Spec Lines, create GT Cars - PORSCHE and classify SC as follows:
GT Cars - PORSCHE
Model Years Body Style Drive- line Wheel- base
(in)
Notes
SC 1978 2 Dr. Rear engine/RWD 89.45 May use alternate engine bore.
4.0L 2V @2275 lbs. 4.0L 4V @ 2350 lbs.

2026-02-01 GT2 Classify T1 BMW in GT2

#39408 from Jared Lendrum · Rule change · TB 26-02 (2026-02 Fastrack)

In GT Spec Lines, classify M3 E92 in GT Cars - BMW as follows:
GT Cars - BMW
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
M3 E92 (08-13) 2 Dr. RWD 108.7 Cannot be built to any other rule set.

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

2026-03-01 GT2 Classification Request - Ginetta G56 GT4 (V8)

#39625 from Kevin Park · Rule change · TB 26-03 (2026-03 Fastrack)

In GT2 Spec Lines, GT Cars - GINETTA, classify Ginetta G56 GT4 (V8) as follows:
GT Cars - GINETTA
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Ginetta G56 GT4 (V8) N/A 2 dr. RWD N\A

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

2026-03-01 GT2 Remove GT3U from GCR as it is now in STU

#39862 from SCCA Staff · Rule change · TB 26-03 (2026-03 Fastrack)

In GCR, change as follows:
9.1.2 Page 68: "GT-3U (GT3U)"
9.1.2.F page 320: "9.1.2.F. GT-2, 3, 3U LI TE CATEGORY SPECIFICATIONS"
9.1.3.9 Page 320: "9. 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 including the 225 lbs. TCR cars are ineligible for GT3/GT3U.
Table B: Alternate Vehicle and Engine Allowances Page 461:

2026-03-01 GT2 Audi R8 GT4 remove spec line notes

#39864 from Grand Touring Committee · Rule change · TB 26-03 (2026-03 Fastrack)

In GT2/ST Spec Lines, AUDI R8 GT4, change Notes as follows:
"Must have GT4 rules in possession at all race events. Please see note at top of GT2-ST Header."

2026-04-01 GT2 Corvette C7 (14-19) L76 Specline Errors/Missing Changes

#39838 from Andrew AQUILANTE · Rule change · TB 26-04 (2026-04 Fastrack)

In GT2-ST Spec Lines, Chevrolet Corvette (14-19), change as follows:
Minimum Weight: "3100 3000"
Restrictor "80 83mm FPR"

2026-04-01 GT2 GT2 Porsche 997.2 GT3 Cup

#39936 from Grand Touring Committee · Rule change · TB 26-04 (2026-04 Fastrack)

In GT2 Cars - PORSCHE, 997.2 GT3 Cup, change Notes as follows:
"3.8L flat six. 2800 lbs. Aftermarket header allowed. Cars must be prepared in accordance with the appropriate model/year
Porsche factory 911 GT3 Cup parts catalog/service manual. Cars may not be altered in any way except as authorized below.
Drivers must have the correct year manuals as they apply to their specific car in their possession. Safety, drivers comfort, driver
control and instrumentation items may be modified per the GCR. Original factory installed Matter/IMV roll cages are allowed.
The stock unmodified fuel tank is allowed. Windshield clips must be installed per GCR 9.3 Windshield Clips/Rear Window Straps.
All other SCCA safety standards apply. The following additional modifications are authorized: Alternate hood provided it is a
facsimile of the stock part. Any wheel, including 5 bolt (and the required 5 bolt modification to the hubs). Tires per GCR 9.3 Tires.

2026-05-01 GT2 Panoz Esperante GTS Letter ID Number: #38494 - Additional Info

#38584 from Brian Goldburg · Rule change · TB 26-05 (2026-05 Fastrack)

In GT2 Spec Lines, GT Cars - PANOZ, Esperante GTS, change Notes as follows:
"Cars must be prepared to Panoz Esperante GTS specifications and competitors must have a copy of the current GTS rules in
their possession. Wheels: (F) 18x10 (R) 18x11. Track (F) 64.0 (R) 67.8. Any tire with a diameter of 17” or 18” may be used
provided the tire does not exceed a maximum cross section width of 11.5” in the front and 12.5” in the rear; or may use
conventional GT2 tires and wheels per GTCS 9.1.2.F.4.c.10. Internal modification to stock Penske 7500 shocks are permitted.
Shock seals are not required. Brakes are unrestricted. Front and rear anti-roll bars are unrestricted. Shock and springs are free,
transmission type and ratios are free, differential gear ratio only is free (all GT2 transmission rules apply), roof vents allowed per
GTCS.

2026-05-01 GT2 Appendix L Update

#39923 from Butch Kummer · Rule change · TB 26-05 (2026-05 Fastrack)

In GCR, Section APPENDIX L. 2013 TA2 TECHNICAL REGULATIONS, 4.8.2.1., change as follows:
"Shock Absorbers: $850$1005 each
Front Brake Calipers: $715 each
Rear Brake Calipers: $550$585 each
Brake Pads: $250/axle$330 per axle
Wheels: $175$165 each"

2026-05-01 GT2 GT2 Porsche 997.2 GT3 Cup EDIT

#40125 from Grand Touring Committee · Rule change · TB 26-05 (2026-05 Fastrack)

In GT2 Spec Lines, GT2 Cars - PORSCHE, 991.1 GT3 Cup, change Notes as follows:
"Modifications listed in Grand Am, IMSA Cup and World Challenge or any other rules, except those listed above, are specifically
not allowed are permitted. Factory (OEM manufacturer) Lexan front windows allowed as delivered. ABS is allowed."