Ferrari 296 GT3 Classification Request
#39873 from Demetrio Bilbatua · Rule change · TB 26-04 (2026-04 Fastrack)
In GTX-MISC Spec Lines, classify Ferrari as follows:
GTX - MISC
Make Homologation Model Restrictor
(mm) Weight (lbs) Notes
GTX: rule changes
In our results from 2025-01-10 to 2026-08-29.
Wording removed by a change is shown struck through, as in the original. 43 changes, 36 other letters.
Changes made
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 atcurrent GT3 race weight plus 225lbs. All Gt3U cars shall run a DOT approved tire with a maximum section width of 245. GT3Ucars 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 thetotal weight including the 225 lbs. TCR cars are ineligible for GT3/GT3U.
Table B: Alternate Vehicle and Engine Allowances Page 461:
Show 3 more lines
“Increase the minimum weight of all GT3/GT3U 2.0 liter unrestricted engines to +75 lbs. All GT3 cars running in STU must meet
the minimum ride height of 3.0” for the main frame rails not including rub blocks and a 2” minimum for the front spoiler and
splitter."
Please Consider Adding a Spec Line to GTX Table 4 for the RCR T70
#39470 from Peter Jankovskis · Rule change · TB 26-01 (2026-01 Fastrack)
In GTX-Misc. Table 4, classify RCR70 Coupe:
GTX – MISC. TABLE 4
Make Homologation Model Restrictor
A specification table follows in the original; it is not shown here.
Ligier P3 LS Swap
#38164 from Bart Wolf · Rule change · TB 25-06 (2025-06 Fastrack)
In GTX Spec Lines, GTX-MISC., Ligier, LMP3, 3.0L, Add to Notes the following:
"Allow any normally aspirated LS Chevrolet engine may be used."
Request to Classify Porsche GT2 RS Clubsport
#37972 from Paul Fairchild · Rule change · TB 25-05 (2025-05 Fastrack)
In GTX, Classify Porsche GT2 RS Clubsport, as follows:
GTX
Make Homologation Model Restrictor
(mm)
Weight
(lbs) Notes
Porsche GT2 RS Clubsport Must have factory specifications available at all race events
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.
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"
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.”
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.”
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.”
KTM X Bow GTX
#34956 from Demetrio Bilbatua · Rule change · TB 24-01 (2024-01 Fastrack)
In GTX Spec Lines, classify KTM as follows:
GTX – KTM
Make Homologation Model Restrictor
(mm) Weight (lbs) Notes
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
Show 24 more lines
GTL Cars 364
GTA Cars 377
P2 Engine Table B.1
2010 and older
Stock Kawasaki
38.5mm
minimum width 52 inches. AMAC-AM5:
minimum width 54 inches.
P2 Engine Table B.1
2008 and older
Stock Engine Suzuki,
Yamaha,
Honda, BMW
38.5mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 38.5mm
Modified Engine
950 lbs.
1005cc max
P2 Engine Table B.1 37mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 39mm
Stock Engine
1050 lbs.
Request Ligier LMP3 Classification
#34043 from Alex Kirby · Rule change · TB 23-06 (2023-07 Fastrack)
In GTX Spec Lines, classify Ligier LMP3 as follows:
GTX - MISC
Make Model Engine Restrictor
(mm) Weight (lbs) Notes
Ligier LMP3 3.7L NA 2203
Ligier JSP4 Request
#34173 from Bob Monette · Rule change · TB 23-06 (2023-07 Fastrack)
In GTX Spec Lines, classify Ligier JSP4 as follows:
GTX - MISC
Make Model Engine Restrictor
(mm) Weight (lbs) Notes
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
Show 6 more lines
GCR Section 9.4.
In GT Spec Lines, GT1Engines - classify Ford V8 as follows:
GT1 Engines - Ford
Engine
Family
Engine Type Bore x
A specification table follows in the original; it is not shown here.
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."
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
Show 8 more lines
permitted to relocate the standard headlight, parking light, signal light, etc., openings. Traditional GT cars only. Not allowed with
any "Spec Car, GT2-ST, or any other added non Traditional GT car. Taillights shall be in the original location and shall may be the
original style/type of taillight for the make, model, and year of car. A rear body panel having the same contour as the original
lens area and in the original location, may be fitted with a tail-light graphic of the original style/type frame/lens adhered to it. If
side marker lights are an integral part of the tail-light assembly they must be represented by the panel graphic. These
panel/graphics shall have a functioning red LED lamp assembly fitted through them on both sides of the car to serve as brake
lights. A 15-watt or equivalent rain light may be included with-in this LED assembly or may be a separately mounted single or
dual LED assembly."
Classify 992 GT3 Cup
#32649 from SCCA Staff · Rule change · TB 22-06 (2022-06 Fastrack)
In GTX, classify the Porsche 992 GT3 Cup Car as follows:
GTX – MISC.
Make Model Engine
Restrictor
(mm)
Add Classification to the accepted Model Table
#31981 from Henry Hill · Rule change · TB 22-05 (2022-04 Fastrack)
In GTX Table 4, add a spec line as follows:
Table 4
Marque Model Engine Restrictor Min Weight (lbs) Notes
Wolf GB08 F1 Ford 52XS V8 NA 1725
Must comply with specifications found here:
https://www.scca.com/pages/
technical-forms-and-downloads
Request to classify C7 Corvette Grand Sport IN GTX Misc
#32254 from Joe Aquilante · Rule change · TB 22-05 (2022-04 Fastrack)
In GTX Spec Lines, classify C7 Corvette Grand Sport as follows:
GTX - MISC
Make Homologation Model
Restrictor
(mm)
Weight
(lbs) Notes
C7 Corvette Grand Sport NA 3200 May remove “displacement on demand” valve train system
E&O list of eligible prototypes
#32511 from Club Racing Board · Rule change · TB 22-05 (2022-04 Fastrack)
In GTX, GCR section 9.1.2.H.B, change as follows:
"10. IMSA GTP (1994-1998 1981-1993)
11. - IMSA Camel Lights (1985-1993)
12. - Le Mans Prototype 1 (1999-2013)
13. - Le Mans Prototype 2 (1999-Present)
14. - Le Mans Prototype 3 (2017-Present)
15. - Le Mans Prototype Challenge (2009-2018)
16. - World Sports Car (1994-1998)
Show 1 more lines
11. 17. Vehicles listed in Table 4 below."
McLaren 720s GT3
#31955 from Demetrio Bilbatua · Rule change · TB 22-03 (2022-03 Fastrack)
In GTX - FIA GT3, classify McLaren as follows:
GTX – FIA GT3
Make Homologation Model
Restrictor
(mm)
Weight (lbs) Notes
McLaren GT3-N/A GT3 720s 3000 lbs.
Remove restrictions from GTX-FIA GT3
#32039 from Club Racing Board · Rule change · TB 22-02 (2022-02 Fastrack)
In GTX-FIA GT3 Spec Lines, remove all Restrictor (mm) as follows:
Acura: "(2) 35 TIR"
Aston Martin: "(2) 41.5"
Audi GT3-038: "(2) 39"
Audi GT3-017: "(2) 40 TIR"
Bentley: "(2) 38"
BMW GT3-043: "(2) 34 TIR"
BMW GT3-023: "70"
Show 11 more lines
Chevrolet: "52"
Dodge: "(2) 39"
Ferrari GT3-029: "(2) 40 TIR"
Ferrari GT3-044: "(2) 35 TIR"
Lamborghini: "(2) 39"
Mclaren: "(2) 36 TIR"
Mercedes: "(2) 41.5"
Porsche: "(2) 41.5"
Nissan: "(2) 40 TIR"
In GTX-FIA GT3 Spec Lines, correct name as follows:
"Mcl Laren"
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.
Request to classify 2020 Porsche 718 GT4 Clubsport MR
#30956 from Tyler Hoffman · Rule change · TB 21-09 (2021-09 Fastrack)
In GTX-SRO-GT4, classify Porsche 718 Club Sport MR GT4:
GTX – SRO-GT4
Make Homologation Model
Restrictor
(mm)
Weight (lbs) Notes
Porsche 718 Club Sport MR GT4 Unrestricted 2900lbs. Must run GT4 Spec.
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"
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
Show 1 more lines
possession at each event.
Request classification of Grullon
#30481 from Diego Grullon · Rule change · TB 21-07 (2021-07 Fastrack)
In GTX Spec Lines, classify Grullon, as follows:
GTX -
Make Homologation Model
Restrictor
(mm)
Weight
(lbs) Notes
GRULLON GT Unrestricted 2350 Must comply with factory specifications, must have
Show 1 more lines
factory spec manual in possession at each event.
GT Category Wording
#29193 from Randall Smart · Rule change · TB 20-09 (2020-09 Fastrack)
In GCR, Section 9.1.2.F.3.5., Specifications, change as follows:
"Turbocharging/supercharging is not permitted. unless listed on the spec line."
Request Car classification
#28935 from Ryan Lesher · Rule change · TB 20-08 (2020-08 Fastrack)
In GTX, classify the Chevrolet Camaro ZL1 as follows:
A specification table follows in the original; it is not shown here.
X-Bow GT4
#29088 from Grand Touring Committee · Rule change · TB 20-08 (2020-08 Fastrack)
In GTX, KTM, add new classification as follows:
GTX – SRO GT4
Make Homologation Model
Restrictor
(mm)
Weight
(lbs) Notes
KTM GT4 X-Bow NA 2000 Turbocharged 2.5L Audi TFSI I5
TA2 Gurney flap wicker clarification
#28874 from SCCA Staff · Rule change · TB 20-07 (2020-07 Fastrack)
In Appendix L TA2 Rules, clarify wording as follows:
“4.8.4.1.10.1.1: The maximum height of the wing, including end plates and wicker Gurney flap, can be
no greater than the highest point on the roof. The roof may not be altered or pushed up to increase its
height.”
“4.8.4.1.10.1.5: The wing end plates must fit within a rectangle measuring 11.00 inches long by 4.00
inches tall. All wing elements, including the wicker bill Gurney flap, must be kept within the profile of the
end plates. The endplates must be mounted parallel to the vehicle centerline, and must be
perpendicular to the ground. Endplates must be flat, with no curvature or Gurney tabs flap. “
Show 23 more lines
“4.8.4.1.10.1.6: A wicker bill (Gurney) Gurney flap may be added to the wing element. It must be a
uniform shape across the complete width of the wing. No air may pass between the wicker bill Gurney
flap and the wing. It must form a 90 degree angle with the wing surface. The size of the wicker bill
Gurney flap cannot exceed 0.50 inch high as measured from the wing surface. The thickness of thewicker Gurney flap material must be 0.625 inch.”
“4.8.4.1.10.2.4: The dog leg style Howe endplates must be used without modification. All wing
elements, including the wicker bill Gurney flap, must be kept within the profile of the end plates. The
endplates must be mounted parallel to the vehicle centerline, and must be perpendicular to the ground.
Endplates must be flat, with no curvature or Gurney tabs flap. “
“4.8.4.1.10.2.5: A wicker bill (Gurney) Gurney flap may be added to the upper wing element. It must be
a uniform shape across the complete width of the wing. No air may pass between the wicker bill Gurney
flap and the wing. It must form a 90 degree angle with the wing surface. The size of the wicker bill
Gurney flap cannot exceed 0.375 inch. The thickness of the wicker bill Gurney flap must be 0.0625
inches.”
“4.8.4.2.10.3.4: The dog leg style Howe endplates must be used without modification. All wing
elements, including the wicker bill Gurney flap, must be kept within the profile of the end plates. The
endplates must be mounted parallel to the vehicle centerline, and must be perpendicular to the ground.
Endplates must be flat, with no curvature or Gurney tabs flap. “
“4.8.4.2.10.3.5: A wicker bill (Gurney flap) Gurney flap may be added to the upper wing element. It must
be a uniform shape across the complete width of the wing, and must be kept within the profile of the
end plates. It must form a 90 degree angle with the wing surface. The size of the wicker bill Gurney flap
cannot exceed 0.375 inch high as measured from the wing surface. The thickness of the wicker Gurney
flap material must be 0.0625 inch.”
STO Gurney flap wicker clarification
#28883 from SCCA Staff · Rule change · TB 20-07 (2020-07 Fastrack)
In Appendix K, STO, clarify wording as follows:
B.2.a.: "Wings shall be a single element with a maximum chord length of 12.00 inches, including anywicker Gurney flap."
B.2.c.: "The entire rear wing assembly, including the end plates and any wicker Gurney flap, shall be
mounted level with, or below, the peak of the roof."
GT Gurney flap wicker clarification
#28909 from SCCA Staff · Rule change · TB 20-07 (2020-07 Fastrack)
In GT, GCR section 9.1.2.F.7.b.12., clarify Gurney flap as follows:
"D. The use of fences, end rails, Gurney flaps, wickerbills,or other forward facing lips or aerodynamic
devices is prohibited."
"E. A maximum 0.50 inch Gurney tab flap is allowed at the trailing edge of the wing element. The tab
must be mounted 90 degrees to the upper wing surface. No air may pass between the tab and the wing.
The endplates must be mounted parallel to the vehicle centerline, and must be perpendicular to the
ground. Endplates must be flat, with no curvature or Gurney tabs flaps."
"GT3: The maximum width of the entire wing assembly (wing element, endplates, Gurney tab flap and
Show 9 more lines
mounting hardware) is 64.00 inches, but no wider than the rear body width including fender flares."
In GT, GCR section 9.1.2.F.7.b.13., clarify Gurney flap as follows:
"A. Endplates must be flat, with no curvature or Gurney tabs flap. A maximum 0.5-inch wicker-bill Gurney flap may be employed."
In GT, GCR section 9.1.2.F.7.b.15.D., clarify Gurney flap as follows:
"2. Rear Wing: Wings shall be a single element with a maximum chord length of 12.00 inches, including
any wicker Gurney flap."
"4. The entire rear wing assembly, including the end plates and any wicker Gurney flap, shall be
mounted level with, or below, the peak of the roof."
Request to Re-classify SP Stock car to GTX
#28333 from Robert Blizzard · Rule change · TB 20-06 (2020-06 Fastrack)
In GTX, 9.1.2.H.B.4., change as follows:
"GTX tube frame cars will consist of currently classified GT1 cars with improved aerodynamics, wheels,
brakes and limited fuel injection systems. Stock car bodies permitted. GTX tube frame cars must weigh
2780 pounds."
Request to Classify Lotus Evora GTS
#27057 from William Goodro · Rule change · TB 20-05 (2019-05 Fastrack)
In GTX, classify the Lotus Evora GTS as follows:
GTX - MISC
Make Model Engine Restrictor
(mm)
Weight
(lbs) Notes
Lotus Evora GTS 3.5L 2GR-FE N/A 2950 OEM Supercharger Pulleys.
Windshield Clips
#27323 from Todd Oppermann · Rule change · TB 20-02 (2020-02 Fastrack)
In GCR section 9.1.2.F.6.c.1, add as follows:
Alternatively, the bottom may be captured in a channel.
"No clips or straps are required if bonded-glass factory windshields and/or rear windows are attached to
chassis per original specifications (i.e., glass-bonding adhesive).”
Request Factory Five Daytona coupe classification
#26308 from Andrew Wickline · Rule change · TB 20-01 (2020-01 Fastrack)
In GTX - MISC., Classify and add as follows:
GTX – MISC.
Make Model Engine Restrictor
mm Weight (lbs) Notes
Factory Five Type 65
Coupe R
Ford
302/351
Show 2 more lines
NA 2600
Factory Five Type 65
A specification table follows in the original; it is not shown here.
Request GTX Fuel injection for previous GT-1 tube frame cars
#26141 from Michael Major · Rule change · TB 19-05 (2019-05 Fastrack)
In GTX, GCR section 9.1.2.H.I.3, add throttle body size as follows:
“GTX tube frame cars may install fuel injection system, maximum throttle body
size TBD 90mm.”
Request to Classify Ligier JS2 R
#26535 from Jeffery Smisek · Rule change · TB 19-05 (2019-05 Fastrack)
In GTX, classify the Ligier JS2 R as follows:
GTX- MISCModel Homologation Model Restrictor Weight Notes
Request Ride Height Clarification
#26600 from SCCA Staff · Rule change · TB 19-04 (2019-04 Fastrack)
In GT1, GCR section 9.1.2.D.5.a.1, omit ride height and re-number section as follows:
“a. Ride Height1. No part of the car to the rear of the front tire opening, including the exhaust, may touch theground when two (2) tires on the same side of the vehicle are deflated.”
In GT-2, 3, LITE, GCR section 9.1.2.F.7.b, remove and re-number section as follows:
“3. No part of the bodywork or chassis, to the rear of the front wheel opening, shall touch theground when both tires on the same side of the car are deflated.”
Replace FIA references with SRO
#26427 from SCCA Staff · Rule change · TB 19-03 (2019-03 Fastrack)
In GTX, strike all references to FIA GT4 and replace with SRO GT4.
GTX Homologation table update
#26034 from Club Racing Board · Rule change · TB 19-01 (2019-01 Fastrack)
In GTX, FIA GT3, classify the Audi R8, BMW Z4, and Ferrari 488 Challenge as follows:
FIA GT3 -
Make Homologation Model Restrictor
mm Weight (lbs) Notes
Acura GT3- 047 NSX (2) 35 TIR 3015
Aston Martin GT3-O32 Vantage (2) 41.5 2980
Audi GT3-017 R8 (2) 40 TIR 2900
Audi GT3-038 R8 LMS (2) 39 TIR 2980
Show 12 more lines
Bentley GT3-035 Continental (2) 38 TIR 3070
BMW GT3-043 M6 (2) 34 TIR TBD
BMW GT3-023 Z4 70 2800
Chevrolet GT3-045 Corvette C7 52 3070
Dodge GT3-036 Viper (2) 39 3120
Ferrari GT3-029 458 (2) 40 3025
Ferrari GT3-044 488 (2) 35 TIR 3025
Lamborghini GT3-040 Huracan (2) 39 TIR 3015
Mclaren GT3-037 650S (2) 36 TIR 2915
Mercedes GT3-042 AMG GT (2) 34.5 TIR 3090
Porsche GT3-041 991 (2) 41.5 2960
Nissan GT3-030 GT-R (2) 40 TIR 3050
A specification table follows in the original; it is not shown here.
Other letters
GTX Category
#39342 from Javier Delgado · No action required · Minutes (2026-01 Fastrack)
In GTX-Misc. there are no specific years for either of the cars in question.
Response to letter 37919
#37950 from Armen Megregian · Not recommended · Minutes (2025-07 Fastrack)
Thank you for your letter. The balance of performance (BOP) is based on the performance potential of any car in any given class.
Add choke size wording to GCR
#36511 from Ken Gassin · Recommended to the Board · Minutes (2024-09 Fastrack)
In GCR, Section 9.1.2.F.7.k., change the following:
"k. GTLite Rules Concerning Alternate Weights, Chokes and SIRs"
In GCR, Section 9.1.2.F.7.k., add the following:
"Competitors running the alternate choke option must display the word "CHOKE" as well as size in mm next to the weight."
Saleen S1 Cup car to Compete in GTX
#33829 from Dominic Starkweather · No action required · Minutes (2024-05 Fastrack)
Thank you for your letter. Please the CRB response to your request letter #33522.
Adding BSPEC cars and engines to GTL
#35228 from Jonathan Stalzer · Not recommended · Minutes (2024-01 Fastrack)
Thank you for your letter. As an already classified SCCA class with rules of their own the Bspec cars do not comply with the GTL
rules.
9.1.2.10 Sequential Shifted Transmission Request
#35196 from Erik Madsen Madsen · Not recommended · Minutes (2024-01 Fastrack)
Thank you for your letter. The CRB feels that this request is inappropriate for the class.
GT Committee Application and Resume
#35118 from Ken Gassin · Member feedback requested · Minutes (2024-01 Fastrack)
Thank you for your resume. The GTAC would like to accept your offer to join the GT Advisory Committee.
DATE: December 20, 2023
KTM X Bow GTX
#35050 from Demetrio Bilbatua · No action required · Minutes (2024-01 Fastrack)
Thank you for your letter. Please see response to letter #34956 in current Fastrack.
Public Data
#34954 from Steve Davis · Not recommended · Minutes (2024-01 Fastrack)
Steve- The "data" that is compiled from the SOLO boxes is available only to the Data Team who prepare reports for review by
the AC's and CRB. We do not believe that putting that information into the public domain would result in any appreciable
improvement in the road racing program. Thank you for your interest in the program.
Follow-up on Letter 34453
#35170 from David Gomberg · Taken care of · Minutes (2023-12 Fastrack)
Thank you for your letter. Please see letter #34453 in current Fastrack.
Makes no sense
#34713 from Philip Di Pippo · No action required · Minutes (2023-11 Fastrack)
Thank you for your letter. Please see letter #34815 in current Fastrack.
Verifying GTX Class Eligibility and Restrictions
#34605 from Daniel Speer · No action required · Minutes (2023-11 Fastrack)
Thank you for your letter. This car is already classified in GTX Tube Frame @2780 lbs.
GT4RS Clubsport in GTX
#34665 from Kelsey Karanges · No action required · Minutes (2023-09 Fastrack)
Thank you for your letter. This car is already classified in T1 with DOT tires and GTX with slicks.
Requesting BMW GC10 Classification in GTX Class.
#33387 from Christopher Shelhart · Not recommended · Minutes (2023-01 Fastrack)
Thank you for your letter. Using a BMW body with a Chevrolet engine is not consistent with class philosophy
9.1.2.F.7.n.4.D
#33170 from Peter Zekert · Recommended to the Board · Minutes (2022-12 Fastrack)
In GT-2, 3, LITE CATEGORY SPECIFICATIONS, GCR section 9.1.2.F.7.n.4.D, add as follows:
"Carburetors shall incorporate a butterfly-type throttle plate for engine speed control. For GTLite only: Carburetors shall
incorporate a butterfly or slide-type throttle plate for engine speed control."
9.1.2.F.7.c.1
#33169 from Peter Zekert · Not recommended · Minutes (2022-11 Fastrack)
Thank you for your letter. The CRB feels that the current method of competitors requesting an alternate wheel base be added
to their "spec line" is the best way to deal with this!
Supplement and Correction to letter #32699 (Ginetta G56)
#32702 from Philip Di Pippo · No action required · Minutes (2022-11 Fastrack)
Thank you for your letter. Please see letter #33076 in September 2022 Fastrack.
Response and Further Request Following Letter 32514 (Ginetta G56)
#32699 from Philip Di Pippo · No action required · Minutes (2022-10 Fastrack)
Thank you for your letter. Please see letter #33076 in September 2022 Fastrack.
Lack of Mirrors on GT cars
#32837 from Andrew Aquilante · Not recommended · Minutes (2022-09 Fastrack)
Thank you for your letter. The wording as shown in 9. Cars and Equipment: 9.3.35 is satisfactory wording for all GT car mirror
placement if used and enforced!
McLaren 720S
#32310 from Randall Smart · No action required · Minutes (2022-04 Fastrack)
Thank you for your letter. Please see letter #31955 in March 2022 Fastrack.
Reclass original PX cars into GTX
#31694 from SCCA Staff · No action required · Minutes (2022-02 Fastrack)
Thank you for your letter. Please see letter #31948 in January 2022 Fastrack.
Allow SRO TC cars as-is
#31643 from Chris Taylor · Not recommended · Minutes (2022-02 Fastrack)
Chris, thank you for your letter. The CRB believes that such change is unnecessary at this time. The classes will continue to be
monitored.
Prototypes added to GTX
#31948 from Club Racing Board · Recommended to the Board · Minutes (2022-01 Fastrack)
In GTX, Section 9.1.2.H., add Prototypes as follows:
9.1.2.H. GTX CATEGORY SPECIFICATIONS
“A. Purpose and Philosophy
The intent of the GTX category is to allow competition of production-based vehicles that compete in professional road racing
series in the United States.
The GTX class will have annual balance of performance (BOP) changes. Weights may be adjusted, or cars may be subject to
changes in intake restrictors to meet periodic professional series changes. Cars may be required to carry data acquisition
equipment for review of performance.
Show 143 more lines
B. Eligibility
Vehicles meeting one of the following criteria may compete in the GTX category:
1. FIA GT3:
- Cars will be approved on a case-by-case basis with supporting documentation.
- Competitors must have the FIA GT3 sheet, as approved, available for scrutineers when requested.
- Cars approved to run in accordance with their FIA GT3 specifications must adhere to those specifications.
- See GTX spec line for eligible FIA GT3 cars.
2. SRO GT4:
- Cars will be approved on a case-by-case basis with supporting documentation.
- Competitors must have the SRO GT4 sheet, as approved, available for scrutineers when requested.
- Cars approved to run in accordance with their SRO GT4 specifications must adhere to those specifications.
- See GTX spec line for eligible SRO GT4 cars.
3. TCR:
- Cars will be approved on a case-by-case basis with supporting documentation.
- Competitors must have the TCR sheet, as approved, available for scrutineers when requested.
- Cars approved to run in accordance with their TCR specifications must adhere to those specifications.
- SS ee GTX spec line for eligible TCR cars.
4. GTX Tube Frame:
- GTX tube frame cars will consist of currently classified GT1 cars with improved aerodynamics, wheels, brakes
and limited fuel injection systems. Stock car bodies permitted. GTX tube frame cars must weigh 2780 pounds.
5. GTX Grand Am Tube Frame:
- GTX Grand Am tube frame cars will consist of fuel injected tube frame cars classified in the Grand Am Road
Racing series from 2007-2013. GTX Grand Am tube frame cars must provide their Grand Am rule set and
specifications.
6. Daytona Prototype Gen # 1 (2003-2007):
7. Daytona Prototype Gen # 2 (2008-2011):
8. Daytona Prototype Gen # 3 (2012-2016):
9. Daytona Prototype International (2017-):
10. IMSA GTP (1994-1998):
- IMSA Camel Light (1985-1993)
11. Le Mans Prototype
- Le Mans Prototype 1 (1999-2013)
- Le Mans Prototype 2 (1999-Present)
- Le Mans Prototype 3 (2017-Present)
- Le Mans Prototype Challenge (2009-2018)
12. World Sports Car (1994-1998)
13. Vehicles listed in Table 4 below
C. Bodywork
1. FIA or TCR standard bodywork must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
4. Prototype standard bodywork must comply with their associated specifications.
D. Aerodynamic Devices
1. FIA or TCR aerodynamic devices must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications. Trans Am splitter tunnels and rear wing rules are
permitted. Under panning may be installed under the engine bay and rear end housing.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
4. Prototype aerodynamic devices must comply with their associated specifications.
E. Interiors
1. FIA or TCR interiors must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
4. Prototype interiors must comply with their associated specifications.
F. Chassis
1. FIA or TCR chassis must comply with their associated specifications.
2. FIA or TCR chassis weight must meet the vehicle weight listed on the associated specification line.
3. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
4. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
5. Prototype chassis must comply with their associated specifications.
G. Engine
1. FIA or TCR engines must comply with their associated specifications.
2. FIA GT3 cars must compete with the listed restriction in the specification lines.
3. SRO GT4 cars are permitted to compete without restriction.
4. TCR cars are permitted to compete with 100% engine management.
5. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications. Additionally, the following engines are permitted.
Engine Management is unrestricted.
362 cubic inch engines include:
- Chevrolet R07
- Ford FR9
- Dodge R6
- Toyota Phase 11
6. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
7. Prototype engines specifications are open.
H. Cooling System
1. FIA or TCR cooling systems must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
I. Fueling, Piping and Fuel Tanks
1. FIA or TCR fueling, piping and fuel tanks must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. GTX tube frame cars may install fuel injection system, maximum throttle body size 90mm.
4. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
5. Prototype fueling, piping and fuel tanks must comply with their associated specifications.
J. Oil System
1. FIA or TCR oil systems must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
K. Exhaust System
1. FIA or TCR exhaust systems must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
4. Prototype exhaust systems must comply with their associated specifications.
L. Electrical
1. FIA or TCR electrical systems must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
4. Prototype electrical systems specifications are open.
M. Drivetrain
1. FIA or TCR drivetrains must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
4. Prototype electrical systems specifications are open.
N. Suspension and Steering
1. FIA or TCR suspension and steering must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
7. Prototype suspension and steering must comply with their associated specifications.
O. Brakes
1. FIA or TCR brakes must comply with their associated specifications.
2. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications, except brake calipers and rotors do not have a
size limit.
3. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
4. Prototype brakes specifications are open.
P. Tires and Wheels
1. Tires must conform to 9.3. Tires.
2. FIA or TCR wheels must comply with their associated specifications.
3. GTX tube frame cars shall refer to 9.1.2 GT1 category specifications, wheels may be increased to 12.5” front and 13”
rear.
4. Grand Am tube frame cars must comply with the 2007-13 GA specifications.
5. Prototype wheels must comply with their associated specifications.
Table 4
Marque Model Engine Restrictor
Min Weight
(lbs) Notes
Radical SR8 RPE 2.7L V8 NA 1775
Radical SR10
Ford Ecoboost 2.3LHigh
Output 4 cyl.
Turbo NA 1825
Radical RXC
Spyder
Ford Ecoboost 3.5LV6 Turbo
/ RPE 2.7L V8 NA 2400
Radical RXC 600R Ford Ecoboost 3.5LV6 Turbo NA 2675
Revolution A-One Ford 3.7L V6 NA 1925
Superlite Aero Sealed Katech GMLS3 6.2L
V8 NA 2180
Superlite SL-C GM LS7 7.2L V8 NA 2625
Must comply with specifications
foundhere: https://www.
scca.com/pages/ technical-
forms-and-downloads
“
Allow GTX as Runoffs Class in 2022
#30667 from Joe Aquilante · No action required · Minutes (2021-10 Fastrack)
Thank you for your letter. Please see the response to letter #30665 that will appear in current Fastrack.
Make GTX a Runoffs Class
#30665 from Michael Pettiford · Not recommended · Minutes (2021-10 Fastrack)
Thank you for your letter. The CRB has considered your request but does not wish to make GTX a RUNOFF"S eligible class at this
time.
Request aftermarket ECU allowance
#30593 from Nathan McBride · No action required · Minutes (2021-06 Fastrack)
Thank you for your letter. All GT2 and ST cars with the exception of various GT2 "spec" classifications can already have
an ECU of their choice!
Request to Require OEM Sized Side Mirrors
#29840 from Andrew Aquilante · Not recommended · Minutes (2021-01 Fastrack)
Thank you for your letter. The rule is adequate as written "Mirrors shall provide driver visibility to the rear of both sides of the
car."
Request for Clarification on Bridge Porting for Rotary
#26004 from Luis Rivera · Taken care of · Minutes (2021-01 Fastrack)
Thank you for your letter. Please refer to Technical Forms and Downloads on the SCCA website.
GTX Fuel Injection Component Approval Request
#29508 from Chris Ludwig · Recommended to the Board · Minutes (2020-12 Fastrack)
In GTX, GCR Section 9.1.2.H.G.5, change as follows:
"GTX tube frame cars shall refer to 9.1.2 GT1 category specifications. Additionally, the following engines are permitted
362 cubic inch engines include:, Engine Management is unrestricted.
- Chevrolet R07
- Ford FR9
- Dodge R6
- Toyota Phase 11"
Clarification of GTX B.4
#29354 from Chris Ludwig · No action required · Minutes (2020-10 Fastrack)
Thank you for your letter. The procedure is to write a letter requesting "fuel injection system part # XYZ" and the CRB will
review your request with an approval or denial.
Resume for GT
#28181 from Samuel Fouse · Member feedback requested · Minutes (2020-03 Fastrack)
Thank you for your resume. We will keep your resume on file for future needs on the GTAC AdCom.
DATE: February 20, 2020
Windshield Clips
#27323 from Todd Oppermann · Recommended to the Board · Minutes (2020-01 Fastrack)
In GCR section 9.1.2.F.6.c.1, add as follows:
Alternatively, the bottom may be captured in a channel.
"No clips or straps are required if bonded-glass factory windshields and/or rear windows are attached to
chassis per original specifications (i.e., glass-bonding adhesive).”
Request to Allow E85 Race Fuel
#27058 from Joe Harlan · Not recommended · Minutes (2019-08 Fastrack)
Thank you for your letter. Allowing alternate fuel sources is beyond the GTAC's ability.
Request to Classify Mercedes Benz AMG in GT3
#25958 from Matt Jensen · Not recommended · Minutes (2019-01 Fastrack)
Thank you for your letter. The CRB does not plan to classify this car in GT3. It is currently
classified in GTX.
Request to Classify Ferrari 488 Challenge Car
#25957 from Matt Jensen · Taken care of · Minutes (2019-01 Fastrack)
Thank you for your request. This car is being classified in GTX in letter #26034, Technical
Bulletin.
Request to Classify 2016+ Shelby 5.2 350GTR
#23944 from Scotty B White · Taken care of · Minutes (2019-01 Fastrack)
Thank you for your request. Please see the response to letter #21466, Technical Bulletin.