GT3 at Road America

2020-12-01 GT3 Mazda MZR SIR Sizing

#29555 from Christopher Howard · Rule change · TB 20-12 (2020-12 Fastrack)

In GT3, GT3 Engines - MAZDA, MZR, change Fuel Induction as follows:
"31 32"
In GT3, GT3 Engines - MAZDA, MZR/L5-VE, change Fuel Induction as follows:
"31 32"

2020-12-01 GT3 Request to Classify 1992-1997 Honda Prelude

#29687 from Keith Gillespie · Rule change · TB 20-12 (2020-12 Fastrack)

In GT3 Cars - HONDA, classify Honda Prelude as follows:
GT3 Cars - HONDA
Model Years Body Style Drive-line Wheel-base (in) Notes
Prelude 1992-1997 2dr FWD 104”

2021-05-01 GT3 Mazda MZR 2.0L Engine

#30455 from Michael Heintzman · Rule change · TB 21-05 (2021-05 Fastrack)

In GT3 Engines - MAZDA, MZR DOHC 87.38, change Fuel Induction as follows:
"31 32"

2021-05-01 GT3 Disfranchised GT3 Mazda, correct choke size

#30570 from Grand Touring Committee · Rule change · TB 21-05 (2021-05 Fastrack)

In GT3 Engines - MAZDA, Renesis Bridgeport, change Fuel Induction as follows:
"44 2mm"
In GT3 Engines - MAZDA, 13B Bridgeport, change Fuel Induction as follows:
"44 2mm"

2021-07-01 GT3 Request to Permit FP cars in GT3

#30611 from Matt Wolfe · Rule change · TB 21-07 (2021-07 Fastrack)

In GCR, Section 9.1.2.F.3. add the following:
"8. Current FP spec line cars may compete in GT3 as long as they maintain their full FP rule set."

2021-08-01 GT3 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"

2021-10-01 GT3 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.

2021-11-01 GT3 Please approve 1964-1968 Ford Cortina GT for competition in GT#

#30941 from Randall Smart · Rule change · TB 21-09 (2021-09 Fastrack)

In GT3 Cars - Ford, classify Ford Cortina GT as follows effective 11/1/2021:
GT3 Cars - Ford
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Ford Cortina GT 64-68 2dr. RWD 98.0 “

2021-12-01 GT3 31032 correction to weight

#31525 from Grand Touring Committee · Rule change · TB 21-12 (2021-12 Fastrack)

In GT3 Spec Lines, Engines - Volkswagen, “Fun Cup” Beetle Sealed, change weight as follows:
"2060 1850"

2021-12-01 GT3 Add TCR cars to GT3

#31540 from Grand Touring Committee · Rule change · TB 21-12 (2021-12 Fastrack)

In GT3 Spec Lines, classify TCR cars as follows:
GT3-TCR
Make Model Trans Power Level Weight (lbs) Notes
Audi RS3 LMS
(2016-2020)
SEQ 100% 3175 Must use 200 tread wear tires
Audi RS3 LMS
(2016-2020)

2022-02-01 GT3 Request to add Fiat to GT3 CARS

#31803 from Daniel Snow · Rule change · TB 22-02 (2022-02 Fastrack)

In GT3 Spec Lines, classify Fiat Spider 2000, Years 79-81, as follows:
GT3 Cars - FIAT
Model Years Body Style Drive-line Wheel-base (in) Notes
Fiat Spider 2000 79-81 RWD 89.76”

2022-02-01 GT3 Request to add Fiat to GT3 CARS

#31804 from Daniel Snow · Rule change · TB 22-02 (2022-02 Fastrack)

In GT3 Spec Lines, classify Fiat X-19, Years 72-89, as follows:
GT3 Cars -
Model Years Body Style Drive-line Wheel-base (in) Notes

2022-03-01 GT3 Request to Classify Ginetta G40 in GT3

#31598 from Richard Gray · Rule change · TB 22-03 (2022-03 Fastrack)

In GT3 Cars - Ginetta, classify Ginetta G40 as follows:
GT3 Cars - GINETTA
Model Years Body Style Drive-
line
Wheel-
base (in)
Notes
Ginetta G40 2010-

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

2022-03-01 GT3 Normally Aspirated 2.0L DOHC MZR Motor

#31733 from Michael Heintzman · Rule change · TB 22-03 (2022-03 Fastrack)

In GT3 Engines, classify MAZDA MZR as follows:

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

2022-03-01 GT3 Volvo S60 in GT3

#31970 from Sam Moore · Rule change · TB 22-03 (2022-03 Fastrack)

In GT3 Cars - Volvo, classify Volvo S60 as follows:
GT3 Cars - VOLVO
Model Years Body Style Drive-line Wheel-base (in) Notes
Volvo S60 2000-2009 4 Door Sports
Coupe
FWD 106.9

2022-03-01 GT3 GT3 2.0L 4V engines now unrestricted.

#32190 from Grand Touring Committee · Rule change · TB 22-03 (2022-03 Fastrack)

In GT3 Engines Spec Lines, add to Notes the following:
Acura F20C 1997cc: "May run unrestricted at 2195 lbs."
Acura K20A 1998cc: "May run unrestricted at 2195 lbs."
Audi 1984cc: "May run unrestricted at 2195 lbs."
BMW 1895cc: "May run unrestricted at 2195 lbs."
Chevrolet 1998cc: "May run unrestricted at 2195 lbs."
Chrysler/Dodge/Plymouth 1997cc: "May run unrestricted at 2195 lbs."
"Ginetta 1999cc: May run unrestricted at 2195 lbs."

2022-03-01 GT3 TB correction to wing wording

#32191 from Grand Touring Committee · Rule change · TB 22-03 (2022-03 Fastrack)

In GCR, Section 9.1.2.F.7.b.12.E., change the following:
"A single element, single plane airfoil scaled up to a maximum chord length of 10.75 inches."

2022-04-01 GT3 GT3 TCR Car Feedback

#31677 from Tim Myers · Rule change · TB 22-04 (2022-04 Fastrack)

In GT3 Spec Lines, GT3-TCR, change as follows:
Make/Model Audi RS3 LMS (2016-2020) SEQ:
Power Level: "100% 90%"
Weight: "3175 3177"
Notes: "Must use 200 tread wear tires. No tire shaving permitted. Stock TCR wheels only."
Make/Model Audi RS3 LMS (2016-2020) DSG:
Power Level: "100% 90%"
Notes: "Must use 200 tread wear tires. No tire shaving permitted. Stock TCR wheels only."

2022-05-01 GT3 wheel size addition

#32247 from Grand Touring Committee · Rule change · TB 22-05 (2022-04 Fastrack)

In Grand Touring Category Specifications, GCR Section 9.1.2.F.10.b, change as follows:
"The maximum wheel size for GT3 cars is 15 x 7”. Alternatively: GT3 cars may run up to a maximum 17" x 9" wheel with a weight
penalty equal to three (3) percent of the car's weight as listed on the specification line. The maximum vehicle weight shall be
rounded to the nearest pound.
Alternatively, a Additionally: Any wheel up to 18” with a maximum tire cross section of 12.0” and a maximum tire diameter of
26.0” may be used with a weight penalty equal to eight five (5) percent of the car’s weight as listed on the specification line. The
minimum vehicle weight shall be rounded to the nearest pound. A maximum brake rotor diameter of 13.0” may be used with
alternate wheels. Cars using 15” American Racer 23.5- 10.0-15, bias ply, non-belted tire may do so without the weight penalty."

2022-06-01 GT3 Correct Fiat Spider Years

#32149 from Daniel Snow · Rule change · TB 22-06 (2022-06 Fastrack)

In GT3 Cars - FIAT Spec Lines, classify 124 Spider Pinnafarina Spider as follows:
GT3 Cars - FIAT
Model Years Body Style Drive-line Wheel-base (in) Notes

2022-07-01 GT3 Correct Model GT3 - Fiat

#32776 from Club Racing Board · Rule change · TB 22-07 (2022-07 Fastrack)

In GT3 Spec Lines, Cars - Fiat, change model as follows:
"124 Spider Pinnafarina Pininfarina Spider"

2022-08-01 GT3 SR20VET Engine Option Request

#32648 from David Muramoto · Rule change · TB 22-08 (2022-08 Fastrack)

In GT3 Engines, Nissan, classify SR20VET Limited Prep-Turbocharged OEM Engine as follows:
GT3 Engines - NISSAN
Engine Family Engine

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

2022-09-01 GT3 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

2022-10-01 GT3 GT3 Turbo Displacement Clarification

#32952 from Chris Edens · Rule change · TB 22-10 (2022-10 Fastrack)

In GT Category Specifications, GCR Section 9.1.2.E.13.l.3., change Engine Displacement (cc) as follows:
"1401-1800 50"

2022-11-01 GT3 Add 84-87 Civic

#33091 from James Rogerson · Rule change · TB 22-11 (2022-11 Fastrack)

In GT3 Spec Lines, HONDA GT3 Cars, add as follows:
HONDA
GT3 Cars -
Model Years Body Style Drive-line Wheel-base (in) Notes
Civic 84-87 3dr FWD 86.6 Hood bulge allowed, no openings.

2022-12-01 GT3 Turbocharged Engine Rules

#33145 from Michael Heintzman · Rule change · TB 22-12 (2022-12 Fastrack)

In GT3 Engines - Mazda Spec Lines, Mazda BP4W Turbocharged OEM engine, add the following:
GT3 Engines - Mazda

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

2022-12-01 GT3 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 GT3 GT3 Nissian SR20VET unrestricted ECU change

#33432 from Grand Touring Committee · Rule change · TB 22-12 (2022-12 Fastrack)

In GT3 Engines Spec Lines, SR20VET Limited Prep-Turbocharged OEM Engine, change as follows:
Fuel Induction: "TURBO w/ 33mm TIR"
Notes: "Garrett GT2560LS GT2860RS Turbo only. OEM “stock” ECU only. ECU is open."

2023-01-01 GT3 Remove Nissan VG30 engine from GT3

#33609 from Grand Touring Committee · Rule change · TB 23-01 (2023-01 Fastrack)

In GT3 Spec Lines, Engines - NISSAN, VG30, remove Spec Line in its entirety.

2023-01-01 GT3 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 GT3 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.”

2023-05-01 GT3 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.

2023-08-01 GT3 Addendum to letter 33913, GT3 DOT tires.

#34627 from Grand Touring Committee · Rule change · TB 23-08 (2023-05 Fastrack)

In GCR section 9.1.2.F.7.c.10.b, add the following:
"Any racing tire including DOT is allowed in GT3. Cars using 15” American Racer 23.5-10.0-15, bias ply, non-belted tire may do so
without the weight penalty."

2023-10-01 GT3 Classify Honda B20 engine in GT3 CRX

#34781 from Taz Harvey · Rule change · TB 23-10 (2023-10 Fastrack)

In GT3 Engines - HONDA, classify B20 as follows:
GT3 Engines - HONDA

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

2023-11-01 GT3 GT3 TCR 200 TW tires

#34993 from Grand Touring Committee · Rule change · TB 23-11 (2023-11 Fastrack)

In GT3 Spec Lines, GT3-TCR, change Notes as follows:
Audi RS3 LMS (16-20) @ 3170 lbs: "Must use 200 tread wear any DOT tires. No tire shaving permitted. Stock TCR wheels only."
Audi RS3 LMS (16-20) @ 3100 lbs: "Must use 200 tread wear any DOT tires."
Honda Civic Type R (16-20): "Must use 200 tread wear any DOT tires."
Hyundai 130 N (16-20): "Must use 200 tread wear any DOT tires."
Volkswagen Golf GTi (16-20) @ 3177 lbs: "Must use 200 tread wear any DOT tires."
Volkswagen Golf GTi (16-20) @ 3100 lbs: "Must use 200 tread wear any DOT tires."

2023-12-01 GT3 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

2023-12-01 GT3 Toyota Engine Classification Request

#35019 from warren Montague · Rule change · TB 23-12 (2023-09 Fastrack)

In GT3 TOYOTA Engines, classify Toyota 3S as follows:
GT3 TOYOTA Engines -

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

2023-12-01 GT3 GT3 2.0L SIR & weight

#35171 from Grand Touring Committee · Rule change · TB 23-12 (2023-09 Fastrack)

In GT3 Spec Lines, GT3 Cars, change as follows:
"Acura F20C 1997cc 32mm SIR May run unrestricted at 2195lbs.
K20A 1988cc 32mm SIR May run unrestricted at 2195lbs.
Audi 1984cc 32mm SIR May run unrestricted at 2195lbs.
BMW 1895cc 32mm SIR May run unrestricted at 2195lbs.
Chevrolet 1998cc 32mm SIR May run unrestricted at 2195lbs.
Chrysler/Dodge/Plymouth 1997cc 32mm SIR May run unrestricted at 2195lbs.
Ginetta MZR 1999cc 32mm SIR May run unrestricted at 2195lbs.

2024-01-01 GT3 Disenfranchised GT2 RX7.

#35028 from Richard Smith · Rule change · TB 24-01 (2024-01 Fastrack)

In GT3 Spec Lines, reduce all disenfranchised GT2 cars from 150 lbs to 75 lbs.GT3 MAZDA: Body: RX7 NA 2 DR. RWD 95.3 /
95.5 / 95.7 SP – Please review and provide appropriate layout for GCR.
In GT3 Spec Lines, Engines - MAZDA, add to Notes as follows:
12A Peripheral Port at 2300 lbs.: "Disenfranchised GT2* add 75 lbs."
13B Bridgeport: "Disfranchised GT2 add 75 lbs."
13B Peripheral Port: "Disfranchised GT2 add 75 lbs."

2024-01-01 GT3 Turbo Help

#35042 from Chris Edens · Rule change · TB 24-01 (2024-01 Fastrack)

In GT3 Engines - Mazda Spec Lines, Mazda BP4W Turbocharged OEM engine, change Weight as follows:
"2060 1960"

2024-01-01 GT3 Competition Adjustment Request for 13B Peripheral Port

#35100 from Richardo Hollingshead · Rule change · TB 24-01 (2024-01 Fastrack)

In GT3 Engines - MAZDA Spec Lines, 13B Peripheral Port, change Weight as follows:
"2200 2100"

2024-01-01 GT3 Request to Include Toyota GR 86 in GT3

#35197 from Erik Madsen Madsen · Rule change · TB 24-01 (2024-01 Fastrack)

In GT3 Cars - TOYOTA Spec Lines, classify DR86 as follows:
GT3 Cars - TOYOTA
Model Years Body Style Driveline Wheelbase (in) Notes
DR86 2021-2024 2 DR RWD 101.3

2024-01-01 GT3 Fastrack Toyota 3S Correction

#35258 from warren Montague · Rule change · TB 24-01 (2024-01 Fastrack)

In GT3 Engines - Toyota, 3S, change as follows:
Bore: "84.2 86.0"
Stroke: "90.1 86.0"

2024-02-01 GT3 Request to Include Toyota FA24D Engine for use in GT3

#35199 from Erik Madsen Madsen · Rule change · TB 24-02 (2024-02 Fastrack)

In GT3 Engines - Toyota, classify the FA24D as follows: see attachment
GT3 Engines - TOYOTA

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

2024-02-01 GT3 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 GT3 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 GT3 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.”

2024-02-01 GT3 Edit GT3 Nissan QR25DE/DD spec line

#35442 from Grand Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)

In GT3 Engines - Nissan QR25DE/DD, change as follows:
11111’QR25 0DE/DD”

2024-03-01 GT3 Miata Turbo Clarification

#35386 from Chris Edens · Rule change · TB 24-03 (2024-03 Fastrack)

In GCR, Section 9.1.2.F.7.i.3. GT3 Turbocharged Built Engines:, 1401-1850, change as follows:
Restrictor: "34 35 mm"
Weight (lbs): "2250 2350"
In GCR, Section 9.1.2.F.7.i.3. GT3 Turbocharged Built Engines:, relocate chart to 9.1.2.F.7.h.6.d., as follows:
"d. Borg-Warner EFR6258

2024-05-01 GT3 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 GT3 Mazda MZR Engines

#35753 from Sam Fouse · Rule change · TB 24-05 (2024-05 Fastrack)

In GT3 Engines-FORD, Duratech, add to Notes as follows:
"Hood bulge allowed w/ no openings."

2024-05-01 GT3 Disenfranchised GT2 Acura RSX to Run GT3

#35773 from Robert Stratos · Rule change · TB 24-05 (2024-05 Fastrack)

In GT3 Engines -ACURA Spec Lines, K20A, add to Notes as follows:
"RSX body only. Disenfranchised GT2* add 75 lbs."

2024-05-01 GT3 Toyota 4Y Engine Request

#35885 from Scott Schick · Rule change · TB 24-05 (2024-05 Fastrack)

In GT3 Engines - TOYOTA, classify 4Y as follows:
GT3 Engines - TOYOTA
Engine
Family
Engine Type Bore x Stroke

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

2024-05-01 GT3 GT3 spec lines clean-up

#36008 from Grand Touring Committee · Rule change · TB 24-05 (2024-05 Fastrack)

In GT3 Cars - TOYOTA, change Model as follows:
"DR86 GR86"

2024-05-01 GT3 GT3 Honda spec line clean-up x 2

#36009 from Grand Touring Committee · Rule change · TB 24-05 (2024-05 Fastrack)

In GT3 Engines - HONDA Spec Lines, change Engine Family as follows:
"89mm K20C1"
"1973cc K24"

2024-05-01 GT3 GT3 Mazda spec line clean-up x2

#36010 from Grand Touring Committee · Rule change · TB 24-05 (2024-05 Fastrack)

In GT3 Cars - MAZDA Spec Lines, change as follows:
Heading: "4 Model"
"Unrestricted 323"
"2195 626"

2024-06-01 GT3 GT3 +1mm SIR add 175lbs. In

#36098 from Grand Touring Committee · Rule change · TB 24-06 (2024-06 Fastrack)

GCR, Section 9.1.2.F.7. add the following:
"m. GT3 Rules Concerning Alternate Weights and SIRs.
1. Traditional GT3 cars that that are currently required to run an SIR may run +1mm above spec line listed size size with a 175lb.
weight penalty.
2. Competitors running the alternate SIR must display "+1.mm" on the side of their car next to the new weight."

2024-06-01 GT3 Revised GT3 Built Turbocharged chart

#36100 from Grand Touring Committee · Rule change · TB 24-06 (2024-06 Fastrack)

In GCR, Section GT3 9.1.2.13.h.6. GT3 Turbocharger Built Engines, update Chart as follows:
"Engine
Displacement Valves / cyl Restrictor Weight Notes
<1400 4 33 mm 2100
1401-1850 4 35 mm 34 mm 2350 2250
1401-1850 4 35 mm 2350"

2024-07-01 GT3 Correct missed Disenfranchised weight reduction

#36237 from Grand Touring Committee · Rule change · TB 24-07 (2024-07 Fastrack)

In GT3 Cars - PONTIAC, Sunfire GT, change Notes as follows:
"150 75"

2024-07-01 GT3 errors & omissions on GT3 Mazda MZR spec lines

#36241 from Grand Touring Committee · Rule change · TB 24-07 (2024-07 Fastrack)

In GT3 Spec Lines, GT3 Engines - MAZDA, MZR, eliminate 2nd DOHC in its entirety and change Fuel Induction as
follows:
"Unrestricted"

2024-08-01 GT3 Adding Datsun B110 to List of Approved Cars

#36198 from Vaughn Cooper · Rule change · TB 24-08 (2024-08 Fastrack)

In GT3 Spec Lines, classify GT3 Cars - Nissan 1200 (B110) as follows:
GT3 Cars - Nissan
Model Years Body Style Drive-
line
Wheel-
base (in) Notes
1200 (B110) 70-73 2dr RWD 90.6 Must use an engine that is already classified to run
in GT3 or may request an alternate Nissan (Datsun)

2024-08-01 GT3 Honda Civic Type R TCR Weight Reduction Request

#36550 from Nathan Bonneau · Rule change · TB 24-08 (2024-08 Fastrack)

In GT3-TCR Spec Lines, change Weight as follows:
Audi RS3 LMS (16-20) SEQ: "31773077"
Audi RS3 LMS (16-20) DSG: "31003000"
Honda Civic Type R (16-20) SEQ: "32103110"
Hyundai I30N (16-20) SEQ: "3254 3154"
Volkswagen GTI (16-20) SEQ: "3177 3077"

2024-09-01 GT3 2024 Mazda 3 TC request for GT3

#36517 from Derrick Ambrose · Rule change · TB 24-09 (2024-09 Fastrack)

In GT3-TCR Spec Lines, Mazda, classify 3TC as follows:
TCR - MAZDA
Make Model Trans Power

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