This track has been raced on 3 configurations (Scoring Sidebar, 2.40 mi; 17 Scoring Sidebar, 2.53 mi; 16 Runoffs Scoring Sidebar, 2.26 mi). Laps on different configurations are not comparable, so only events on the 2.40 mile layout are shown; switch above to see the others.
Sectors are not comparable across all of these events. Sector times and the theoretical lap use Ohio Valley Great Lakes Champions 2025, Great Lakes Champions 2026 only. Great Lakes Champions 2024 (different number of sectors) counts towards whole-lap times and trap speed only.
2 laps are left out as timing errors (far too short to be a lap of this track). The rest of those sessions, sectors included, is used.
One row per driver and car (a driver who changed cars has a row for each). Each cell is that driver's best in that car across the selected events, with the session it was set in. Best 5-lap stint is the mean of the driver's quickest five consecutive race laps, and consistency is how far their median race lap sat behind their best in that race (small is a driver who does it every lap); both come from the race with the best stint. The fastest in each column is purple, and a car whose best lap is more than 115% of the fastest in its class is greyed (marked ">115%" beside the driver) and left out of the colour scale. Click a column to sort, a row to highlight it.
Theoretical lap is the sum of the best sectors, whichever laps they came from, and never slower than the best lap (where a car's fastest laps were recorded without sector times, its best lap is used). The 115% mark is about the car's best lap only: a car whose best lap is within 115% of the fastest in its class is never marked. Greyed sectors with no theoretical lap mean the sector times on file do not add up to a believable lap. Letters refer to the events above; Q is qualifying, R a race.
Sectors
S1 SF → In 1.19 mi
S2 In → I6A 0.56 mi
S3 I6A → SF 0.65 mi
SPd In → Out 0.02 mi
Sectors are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.
By car
Car
Class
Drivers
Lap
Qual
Race
Trap
S1
S2
S3
Lamborghini Huracan gt3 evo
GT1
1
1:24.612Michael McAleenan
1:25.015Michael McAleenan
1:24.612Michael McAleenan
158.1Michael McAleenan
34.142Michael McAleenan
24.926Michael McAleenan
25.914Michael McAleenan
Ford Mustang
GT1
2
1:26.324David Pintaric
1:26.324David Pintaric
1:26.896David Pintaric
167.0David Pintaric
34.135David Pintaric
25.393David Pintaric
26.294David Pintaric
Chevrolet Corvette
GT1
1
1:26.933Ryan McManus
1:26.933Ryan McManus
1:27.676Ryan McManus
165.6Ryan McManus
34.549Ryan McManus
25.627Ryan McManus
26.369Ryan McManus
Jaguar XKR
GT1
1
1:27.822Michael Lewis
1:28.789Michael Lewis
1:27.822Michael Lewis
Chevrolet Camaro
GT1
5
1:28.349Bryan Scheible
1:31.366Todd Peterson
1:32.861Todd Peterson
165.0Todd Peterson
35.719Bryan Scheible
26.373Todd Peterson
27.739Bryan Scheible
The best any driver of each car managed across the selected events, with who set it. Spellings and model years of the same car are grouped; click a row marked ▸ to see each version. Grouping is worked out from the names, so tell us if two cars are wrongly merged or split.
Rule changes between these events
Runoffs 2016 → Great Lakes Champions 2024 2016-09-19 to 2024-05-17
GT1 GTX Homologation table update
#26034 from Club Racing Board · Rule change · TB 19-01 (2019-01 Fastrack)
neutralGTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.
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.
neutralGT1 and GT2/GT3/LITE ride height requirements removed from GCR sections 9.1.2.D.5.a.1 and 9.1.2.F.7.b.
In GT1, GCR section 9.1.2.D.5.a.1, omit ride height and re-number section as follows: “a. Ride Height 1. No part of the car to the rear of the front tire opening, including the exhaust, may touch the ground 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 the ground when both tires on the same side of the car are deflated.”
#26141 from Michael Major · Rule change · TB 19-05 (2019-05 Fastrack)
fasterGTX tube frame cars gain fuel injection with 90mm maximum throttle body size.
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.”
neutralLigier JS2 R classified in GTX, no performance parameters specified in filing.
In GTX, classify the Ligier JS2 R as follows: GTX- MISCModel Homologation Model Restrictor Weight Notes
GT1 Clarify Trans Am Legal Bodywork and Wing
#26953 from Tony Ave · Rule change · TB 19-07 (2019-07 Fastrack)
fasterGT1 allows Trans Am rear wing, 12" chord, 72" span, 1/2" wicker, 100 sq in endplates, no weight penalty.
Effective 6-01-2019, In GT1, GCR section 9.1.2.D.8.k.2.E, make changes as follows: "In keeping in line with ˜Trans Am bodywork is legal in GT1", An alternate rear wing of 12" average chord length and maximum 72"ÂÂÂÂÂÂ long is allowed, with a maximum 1/2" tall wicker, additionally endplates having a maximum size of 100 square inches. There is no weight penalty for this wing." Effective 6-01-2019, In GT1, GCR section 9.1.2.D.8.n.1.B.2, make changes as follows: "In keeping in line with ˜Trans Am bodywork is legal in GT1", A front undertray is
Show 1 more lines
allowed, as shown in 13.15.7 of the Trans Am racing rulebook, with a 50 pound penalty."
neutralGT2/ST Ford 5.0L Coyote 3rd Gen OEM added at 3200 lbs with Boss intake manifold permitted.
Effective 01/01/2020, In GT2/ST, Ford 5.0L “Coyote” engine, add to the notes as follows: ““Boss” intake manifold permitted. Ford Coyote 3rd Gen OEM (2018-2019) Part # M-6007-M-50C @3200lbs."
GT1 Request to Adjust Transmission Penalty
#27750 from J Richard Grant · Rule change · TB 20-01 (2020-01 Fastrack)
fasterGT1 sequential shifting transmission weight penalty reduced from 75 to 50 lbs.
In GT1 Specifications, section 9.1.2.D.4.b.2., make change as follows: "Sequential shifting transmissions are permitted with a 75 50 lb. weight penalty."
GT1 Request to Reduce Additional Weight for 18
#27751 from Matthew Miller · Rule change · TB 20-01 (2020-01 Fastrack)
fasterGT1 non-18-inch-wheel cars now get 18-inch wheels with 50 lb penalty, down from 100 lb.
In GT1 Specifications, section 9.1.2.D.7.a.5., make change as follows: "For cars not specified to allow 18 inch wheels, 18 inch wheels permitted with a 100 50 pound weight penalty."
GT1 Request for Five Star Nascar Compliant Bodywork
#27756 from Tim Adolphson · Rule change · TB 20-01 (2020-01 Fastrack)
neutralGT1 Spec Lines allows 5 Star NASCAR Camaro 2018+ body for General Motors Corporation.
In GT1 Spec Lines, 9.1.2.c, General Motors Corporation, add the following: "5 Star NASCAR Camaro (2018-) body allowed"
neutralGT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications.
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).”
neutralTA2 Gurney flap wording clarified: terminology standardized to 'Gurney flap', height limits and thickness specifications remain 0.50 inch / 0.625 inch or 0.375 inch / 0.0625 inch depending on configuration.
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 the wicker 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.”
neutralSTO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules.
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 any wicker 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."
neutralGT1 Gurney flap wicker clarification: terminology standardized from lips/tabs/wicker to flaps throughout specifications.
In GT1 Specifications, section D, clarify wording as follows: "The use of fences, end rails, Gurney lips flaps, wickerbills, or other forward facing lips or aerodynamic devices is prohibited." In GT1 Specifications, section E, clarify wording as follows: "A maximum 0.50 inch Gurney tab flap is allowed at the trailing edge of the wing element." "Endplates must be flat, with no curvature or Gurney tabs flaps. The maximum width of the entire wing assembly (wing element, endplates, Gurney tab flap, and mounting hardware) is 72.00 inches. In keeping in line with ˜Trans Am body work is legal in GT1”, An alternate rear wing of 12” average chord
Show 2 more lines
length and maximum 72” long is allowed, with a maximum 1/2” tall wicker Gurney flap, additionally endplates having a maximum size of 100 square inches."
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."
GT1 Request to Allow New Trans Am Legal Engines in GT1
#29002 from Tony Ave · Rule change · TB 20-08 (2020-08 Fastrack)
slowerGT1 adds Trans Am spec engines: Chevrolet R07, Ford FR9, Dodge R7, each with 50 lbs. weight penalty.
In GT1, Weight Chart for GT-1, add to chart as follows: "Trans Am spec: Chevrolet/GM - R07 + 50 lbs. Ford - FR9 + 50 lbs. Dodge - R7 + 50 lbs."
neutralGTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix.
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"
neutralGT3 Fun Cup Beetle EVO3 classified with 1984 cc sealed SOHC engine, 2060 lbs minimum weight.
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.
GT1 Wheel Widths
#31844 from Richard Grant · Rule change · TB 22-02 (2022-02 Fastrack)
slowerGT1 allows 17-inch wheels newly; 18-inch wheels require 50 lb penalty; maximum widths 12 front/13 rear, or 13/14 for 18-inch.
In GCR, Section 9.1.2.D.7.a., change as follows: "2. Wheels may be thirteen (13), fourteen (14), fifteen (15), or sixteen (16), seventeen (17) or eighteen (18) inches in diameter, but all four (4) wheels shall be the same diameter. Use of eighteen (18) inches wheels must add 50 lb. weight penalty. 3. Wheels shall have a maximum width of twelve (12) inches in the front and thirteen (13) inches in the rear. 18" tires shall have thirteen (13) in the front and fourteen (14) inches in the rear ." SP - Tony A to consolidate response.
GT1 Mercedes Benz AMG GT3 in GT1
#31883 from THOMAS HERB · Rule change · TB 22-03 (2022-03 Fastrack)
neutralMercedes Benz AMG GT3 classified in GT1 at 3050 lbs with 40mm restrictors, prepared per FIA GT3 homologation.
In GT1 Cars - Mercedes Benz, classify Mercedes Benz AMG GT3 as follows: GT1 Cars – MERCEDES BENZ Model Years Body Style Drive-
A specification table follows in the original; it is not shown here.
GT1 Wheel Widths
#32205 from Club Racing Board · Rule change · TB 22-03 (2022-03 Fastrack)
fasterGT1 wheels: 18-inch tyres get wider rear allowance, from 13 to 14 MAX inches.
In GT1, GCR section 9.1.2.D.7.a., change as follows and renumber: "1. Wheels shall be made of steel, aluminum, magnesium, or a combination thereof. Multi-piece wheels shall utilize mechanical fasteners (bolts, rivets, etc.) for assembly. 2. Wheels may be thirteen (13), fourteen (14), fifteen (15), sixteen (16), seventeen (17), or eighteen (18) inches in diameter, but all four (4) wheels shall be of the same diameter. Use of eighteen (18) inches wheels must add 50 lb. weight penalty. 3. 1.Wheels shall have a maximum width of twelve (12) inches in the front and thirteen (13) inches in the rear. 18” tires shall have thirteen (13) MAX inches in the front and fourteen (14) MAX inches in the rear."
GT1 GT-1/TransAm rules simplification/modernizing
#32763 from Tony Ave · Rule change · TB 22-08 (2022-08 Fastrack)
slowerGT1 TransAm bodywork allowed with 100 lb. weight penalty.
In GT1 Category Specifications, GCR Section 9.1.2.D.8.a. add the following: "7. Current Trans Am bodywork is allowed with a 100lb. weight penalty."
GT1 Tail lights on all GT category race cars.
#32799 from John Mills · Rule change · TB 22-09 (2022-09 Fastrack)
neutralGT taillights may now be original style or a panel graphic with functioning red LED brake lamps; wording change only.
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."
neutralGT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870.
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."
GT1 Request to Reduce Trans Am Bodywork Weight Penalty
#33331 from David Pintaric · Rule change · TB 22-12 (2022-12 Fastrack)
fasterGT1 Trans Am bodywork weight penalty reduced from 100 lbs to 75 lbs.
In Grand Touring 1 (GT1) Specifications, GCR Section 9.1.2.D.8.a.7., change as follows: "Current Trans Am bodywork is allowed with a 100 75lb. weight penalty."
GT1 Request for Reduction in FR9 Weight Penalty
#33332 from David Pintaric · Rule change · TB 22-12 (2022-12 Fastrack)
fasterGT1 Chevrolet RO7, Ford FR9, and Dodge R7 weight penalties reduced from 50 to 25 lbs.
In GT1 (GT1) Specifications, GCR Section 9.1.2.E.1.b.1., change as follows: "Chevrolet/GM - RO7 + 50 25 lbs. Ford - FR9 + 50 25 lbs. Dodge - R7 + 50 25lbs."
GT1 Sequential Transmission Weight Penalty
#33503 from Richard Grant · Rule change · TB 23-02 (2023-02 Fastrack)
fasterGT1 sequential transmission weight penalty reduced from 50 to 25 lbs.
In GCR 9.1.2 Grand Touring 1 (GT1) Specifications, Section 9.1.2.D.4.b.2, change as follows: "Sequential shifting transmissions are permitted with a 50 25lb. weight penalty."
GT1 GT1 Porsche 992
#33730 from Grand Touring Committee · Rule change · TB 23-02 (2023-02 Fastrack)
neutralGT1-ST Porsche 992 GT3 Cup classified with 3997cc displacement, 2950 lbs minimum weight.
In GT1-ST Spec Lines, Cars - Porsche, classify Porsche 992 GT3 Cup Car as follows: GT1-ST Maximum Displacement Minimum Weight Restrictor Notes Porsche 992 GT3 Cup 3997 2950 Car must be prepared in accordance with the appropriate model/year Porsche 992 factory service manual. Factory (OEM
Show 2 more lines
manufactured) Lexan front windows allowed as delivered. ABS permitted.
GT1 Mercedes AMG GT3 Notes
#33804 from Gary D'Abate · Rule change · TB 23-04 (2023-04 Fastrack)
neutralGT1 Mercedes AMG GT3 16-19 preparation wording changed to per FIA GT3 homologation.
In GT1-ST Spec Lines, Mercedes Benz AMG GT3 (16-19), change Notes as follows: "Car must be prepared to per its FIA GT3 homologation. except as specified differently within the GT1 class rules."
GT1 Please classify Fields Cardinal V8
#33784 from James Rogersn · Rule change · TB 23-05 (2023-05 Fastrack)
neutralFields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.
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.
GT1 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)
neutralGTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL.
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
GT1 Request for Acceptance of Lamborghini Huracan GT3 in GT1-ST
#34929 from Michael McAleenan · Rule change · TB 24-01 (2024-01 Fastrack)
neutralLamborghini Huracan GT3 EVO(1) and GT3 added to GT1-ST at 3000 and 3100 lbs minimum weight respectively.
In GT1-ST Spec Lines, classify Lamborghini Huracan GT3 EVO(1) (2018-) as follows: GT1-ST Maximum Displacement Minimum Weight Restrictor Notes Lamborghini Huracan GT3 EVO(1) (2018-) 5204 3000 2 X39mm Per FIA Homologation GT3-040 In GT1-ST Spec Lines, classify Lamborghini Huracan GT3 (2019-) as follows:
Show 6 more lines
GT1-ST Maximum Displacement Minimum Weight Restrictor Notes Lamborghini Huracan GT3 2019- 5204 3100 52mm Per FIA Homologation GT3-040
GT1 Cylinder heads
#35040 from Pater Mumford · Rule change · TB 24-01 (2024-01 Fastrack)
neutralGT1 Trick Flow Specialties Ultra 18 Degree GM Cylinder Head Part #TFS-3181T001-CO1 allowed.
In GCR, Section 9.1.2.D.1.e.3., add at the end of section add the follows: "Trick Flow Specialties Ultra 18 Degree GM Cylinder Head assembly Part #TFS-3181T001-CO1 is allowed."
fasterGT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed.
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.”
GT1 GT Direct Injection allowance and rules
#35437 from Grand Touring Committee · Rule change · TB 24-02 (2024-01 Fastrack)
fasterGT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors.
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.”
GT1 GT2/3 remove Direction Injection not allowed in Spec line notes
#35439 from Grand Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)
fasterGT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E.
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.”
In GCR, Section 9.1.2. GT1 Spec Lines, GT1 Approved Automobile List, LS1 V8 engine allowed with stock intake, add the following: "LS1 Limited Prep GT1 motor 2600 # with driver Blocks : GM castings or aftermarket, no lightening, Max volume 383 cubic inches Cylinder Heads: GM LS castings or aftermarket, stock valve angle, intake and exhaust ports must be in stock location, porting and polishing allowed Valves: No titanium valves, must be stock size for head part number
Show 12 more lines
Rockers: Factory 1.7 rockers only, aftermarket trunion mod allowed Pushrods: Free Intake manifold: stock EFI for variant used or GM 525 carb intake or Edelbrock carb variants ie: Performer RPM, Victor, Victor Jr. or similar. Camshaft: Hydraulic roller only, standard journal size, lift and duration free Timing chain: single or double roller type only water pump: stock or aftermarket in stock location Harmonic dampener: SFI approved, Pistons: Factory or aftermarket flat top pistons only, valve reliefs allowed, coatings allowed Crankshaft: Factory or forged steel aftermarket, 50 lb min. weight Rods: GM stock or aftermarket forged steel Carburetor: one 4150 type 750 cfm max"
GT1 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.
GT1 GT1-ST Adjustments
#37481 from Grand Touring Committee · Rule change · TB 25-01 (2025-01 Fastrack)
unclearGT1-ST restrictor sizes removed for 13 cars; new specs not printed in letter.
In GT1-ST SPEC LINES, change as follows: Aston Martin Vantage GT3 (2012) : Restrictor: "2 x 41.5mm" Audi R8 LMS Ultra GT3 (10-14) : Restrictor: "2 x 49mm" BMW Z4 GT3 (10-13): Restrictor: "70mm" Chevrolet Corvette C8 (20-):
Show 23 more lines
Restrictor: "71mm- Flat Plate" Dodge Viper GT3R (2012-): Restrictor: "2 x 40mm" Dodge Viper, incl Comp Coupe, ACR/ACR-X Max Displacement 8400, Weight 3200: Restrictor: "68mm flat plate" Ferrari 458 GT3 (2011-): Restrictor: "2 x 43mm" Lamborghini Gallardo GT3 (2013): Restrictor: "2 x 47mm" Lamborghini Huracan GT3 EVO(1) (2018-): Restrictor: "2 X39mm" McLaren MP12C GT3 (2013-): Restrictor: "2 x 36mm 1.50 bar" Lamborghini Huracan GT3 (2019-): Restrictor: "2 x 40 mm" McLaren MP12C GT3 (2013-): Restrictor: "2 x 40 mm" Mercedes Benz SLS GT3 (2011-): Restrictor: "2 x 36 mm" Porsche 991 GT3-R (2016): Restrictor: "(2) 35 mm" Porsche 997 GT3 R (2013-): Restrictor: "65mm"
neutralAcura NSX GT3 EVO 22 classified in GT1 with 3500cc twin turbo V-6, 3100 lbs, max RPM 7500.
In GT1 Spec Lines, GT 1 Cars - ACURA, classify Acura NSX GT3 EVO 22 as follows: GT 1 Cars - ACURA Model Years Body Style Drive- line Wheel- base (in) Notes Acura NSX GT3 EVO 22 N/A 2dr RWD 103.5 Ground Clearance 50mm
Show 5 more lines
In GT1 Spec Lines, GT 1 Engines - ACURA, classify Crossflow V-6 as follows: GT 1 Engines - ACURA Engine Family Engine Type Bore x
A specification table follows in the original; it is not shown here.
Ohio Valley Great Lakes Champions 2025 → Great Lakes Champions 2026 2025-05-16 to 2026-05-15
GT1 Correction to Limited prep LS Chevy engine for GT1
#38902 from Robert Logsdon · Rule change · TB 25-09 (2025-09 Fastrack)
neutralGT1 LS Limited Prep Engine expands to include LS1, LS2, LS3, LS6 with 11:1 max compression.
In GCR, Section 9.1.2. GT1 Spec Lines, GT1 Approved Automobile List, LS1 engine allowed with stock intake, make the following change: "LS1 Limited Prep GT1 Motor Chevy LS Limited Prep Engine including LS1, LS2, LS3 and LS6." "Pistons: Factory or aftermarket flat top pistons only, valve reliefs allowed, coatings allowed. Maximum compression ratio 11:1."
GT1 RM 25-06 GT1 reclassify the Acura NSX GT3 EVO 22 to GT1-ST
#39101 from Club Racing Board · Rule change · TB 25-10 (2025-10 Fastrack)
neutralAcura NSX GT3 EVO 22 reclassified from GT1 to GT1-ST with 3100 lbs minimum weight.
IN GT1 reclassify the Acura NSX GT3 EVO 22 to GT1-ST as follows: GT1 Approved Automobile List Make/Model Wheelbase ACURA NSX GT3 EVO 22 103.5” DOHC 4v per cylinder EFI Twin Turbo Crossflow V-6 Displacement 3500cc Bore and Stroke 91x90 MAX RPM 7500 MAX BOOST 2.1 bar Weight 3100 lbs GT1-ST Maximum
Show 4 more lines
Displacement Minimum Weight Restrictor Notes ACURA NSX GT3 EVO 22 3500cc 3100 Per FIA Homologation GT3-047
GT1 NSX Parity With Other GT3s Let Alone a GT1 Car
fasterGT1-ST Acura NSX GT3 EVO 22 weight drops 100 lbs to 3000 lbs.
In GT1-ST, Acura NSX GT3 EVO 22, change Weight as follows: "3100 3000"
GT1 Request for Addition of Porsche 992.1 GT3 Cup into GT1
#39322 from Erik Madsen · Rule change · TB 26-02 (2026-02 Fastrack)
neutralGT1 adds Porsche 992.1 GT3 Cup (2022-2025) with OEM ABS, traction control, RSR bumper, canards, and any exhaust allowed.
In 9.1.2. GT1 Spec Lines, add the following: "992.1 GT3 Cup (2022-2025) OEM ABS and Traction Control allowed. Porsche OEM RSR bumper and canards allowed. Any exhaust system may be utilized."
neutralGT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height.
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:
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."
What the rules allowed changed as listed; this does not say what any particular car ran.