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:
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“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."
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.
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.”
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
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 GT3 Engines - Mazda Spec Lines, add to Notes as follows: 12A Street Port: "Contact National Office for specific details of various allowable port configurations. May machine and use 13B housing to O.E. 12A spec’s." 12A Bridge Port: "Optional choke size 42mm @2010lbs. May machine and use 13B housing to O.E. 12A spec’s." 12A Peripheral Port @ 2150lbs: "May machine and use 13B housing to O.E. 12A spec’s." 12A Peripheral Port @ 2300lbs: "Disenfranchised GT2* May machine and use 13B housing to O.E. 12A spec’s."
In GTL Cars - TOYOTA Spec Lines, classify DR86 as follows: GTL Cars - TOYOTA Model Years Body Style Drive-line Wheel-base (in) Notes DR86 2021-2024 2 DR RWD 101.3
In GCR, GTL Cars, create new sub chart as follows: In GTL change weights for unrestricted engines under 1399cc as follows: Alfa Romeo 1130cc 1605 1565 1290cc 1605 1565 1357cc 1605 1565 AMC/Renault 1289cc 1660 1619 Triumph Spitfire 1147cc 1530 1492 mini 1275cc 1570 1531
In GTL Honda Cars, classify Honda Fit as follows: GTL HONDA Cars - Model Years Body Style Drive-line Wheel-base (in) Notes FIT 2009-13 2 Dr. FWD 99.0 Alternate wheel bases 94.0” 97.0”
Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules
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
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
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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.
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."
In GT Cars - GT Light Spec Lines, add Ford Festiva as follows: GT Cars – GT Lite Model Years Body Style Drive- line Wheel- base (in) Notes Ford Festiva 1988-1993 3 Dr.
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Hatchback FWD 90.2 In GT Lite Engines, Spec Lines, add Mazda B3 as follows: GT Lite Engines -
A specification table follows in the original; it is not shown here.
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
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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."
In GT Cars - Ginetta G40 as follows: GTL Cars - GINETTA Model Years Body Style Drive- line Wheel- base (in) Notes Ginetta G40 2002-
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Present 2-Door Coupe RWD 88.6” Must comply with all GTL rules except as noted on spec line. May use FIA roll cage. Must have complete build specs in possession at all race events. In GT Engines - Ginetta/Ford Zetec as follows: GTL Engines - GINETTA Engine Family Bore x Stroke (mm) Disp. (CC) Head Type Valves / Cyl. Fuel Induction Weight (lbs) Notes Ginetta/Ford Zetec 80.6mm X 88.0mm 1796cc Crossflow 4 22.5 SIR 2050 + 51 lbs for IRS. + 26lbs. for sequential.
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"
In GTL Engines - MAZDA, Spec Lines, 12A, change as follows effective 3/1/2021: Fuel Induction: "27 29mm SIR" Weight: "1950 2000" Notes: "May use a 28mm SIR plus 175lbs."
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. “
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“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.”
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."
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
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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."
Mazda 13b Restrictor Size Follow up to Letter 28518
In Appendix F., SIR testing procedure:, change as follows: "The system is to be tested as is and the result is considered “as qualified or raced”. It is the responsibility of the competitor to present a system that can withstand every possible scenario that would or could result in a failed SIR stall test. The intake system shall be visually inspected for devices and design that could result in induction of additional air that did not pass through the SIR. Introduction of air behind the SIR by any means is prohibited. All inspections must be done in "as qualified or raced" condition."
In GT Category Specifications, section 9.1.2.F.7.b.13., add the following: “Effective 3/1/2020, F. Two wing mounting posts must be used, with each one located within 2"-20" inboard from the end of the wing. The exposed portion of the wing mounting posts must not exceed 85 square inches each. Curved brackets will be measured as if they're in a flat plane as viewed from the side. Mounting brackets are to be included in the measurement."
In GT Category Specifications, section 9.1.2.F.7.b.13., add the following effective 3/1/2020: "F. Two wing mounting posts must be used, with each one located within 2"-20" inboard from the end of the wing. The exposed portion of the wing mounting posts must not exceed 85 square inches each. Curved brackets will be measured as if they're in a flat plane as viewed from the side. Mounting brackets are to be included in the measurement."
In GTL, GCR section 9.1.2.F.7.b.13.A, change the GTL wing rules as follows: "The maximum width of the entire single element, flat plane wing assembly (wing element, endplates, and mounting hardware) is 56.0 inches, but it may be no wider than the bodywork including fender flairs. The maximum chord is 8.0 inches. Wing endplates must fit within a rectangle measuring 8.5 inches wide by 3.0 inches high. may be a maximum of 64 Sq. inches. Endplates must be flat, with no curvature or Gurney tabs. A maximum 0.5-inch wicker-bill may be employed."
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).”
In GTL, Honda CRX 84-87, change notes as follows: "Hood bulge permitted, no openings. May mount wing per hatchback-station wagon spec, but no part of the wing assembly may be above the highest point of the roof. May utilize IRS with a 2.5% weight penalty." In GTL, Honda CRX 88-91, change notes as follows: "Hood bulge permitted, no openings. May mount wing per hatchback-station wagon spec, but no part of the wing assembly may be above the highest point of the roof. May utilize IRS with a 2.5% weight penalty."
In GTL, Fun Cup Beetle, make changes to the spec line as follows: GTL Car VW Model Years Body Style Drive-line Wheel-base (in) Notes Fun Cup Beetle (1.8L) All 2 dr. RWD 94.5 1.8L “Fun Cup” VW/AUDI only (no other
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displacements permitted) 24.5mm SIR @2040 lbs. Engine seals need not be in place. Alternate engine build spec: (Production Limited Prep Level 2) Water cooled, SOHC 81.0 x 86.4, 1780cc, Alum, Non Crossflow, 1 carb restricted to 32mm venturis. @ 2040lbs. Comp Ratio limited to 12,0:1, Valve lift limited to .425”. Refer to PCS 9.1.5.E.2.a.e.f.g.h.i for Limited Prep Level 2 build specs. VW "Fun Cup" Beetle chassis as spec'd in the Fun Cup rule set, must conform to all other safety related rules per GCR or GTCS. Must have rule set in possession at event. See VW engine table for acceptable engines for this chassis.
In GTL, Honda CRZ (10-14), CRZ (15-16), Insight (00-06), make changes to the notes as follows: GTL Cars - Honda Model Years Body Style Drive-line Wheel-base (in) Notes CRZ 10-14 3DR FWD 95.9 Alternate wheelbase 90.6 in.
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CRZ 15-16 3DR FWD 103.1 Alternate wheelbase 90.6 in. Insight 00-06 3DR FWD 94.5 Alternate wheelbase 90.6 in.
In GTL, classify the Fun Cup Beetle as follows: Model Years Body Style Drive-line Wheel- base (in) Notes Fun Cup Beetle
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All 2 dr. RWD 94.5 VW “Fun Cup” Beetle chassis as spec’d in the Fun Cup rule set, must conform to all other safety related rules per GCR or GTCS. Must have rule set in possession at event. See VW engine table for acceptable engines for this chassis.
Request GTX Fuel injection for previous GT-1 tube frame cars
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.”
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.”
In GTL, Engines - BMC thru Rover Group, Mini/Sprite/Midget, 1275 1380 1399, Iron, non- Crossflow, change notes as follows: “Any mini that retains the OE common sump gearbox configuration may reduce their weight by 50 125 lbs.” In GTL, Engines - BMC thru Rover Group, Mini/Sprite/Midget, 1275 1380 1399, Alum. Crossflow, change notes as follows: “Any mini that retains the OE common sump gearbox configuration may reduce their weight by 50 125 lbs.”
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The not recommended portion of this letter can be found in letter #26020.
engines. In GTL, BMC thru Rover Group, remove these long inactive Mini engines: 948,970,1071,1098 Mini OHV 62.992 x 76.2 948 Iron, nonCrossflow 2 Unrestricted 1210 Any mini that retains the OE common sump gearbox configuration may reduce their weight by 50 lbs. Mini OHV 70.6 x 61.91 970 Iron, nonCrossflow 2 Unrestricted 1235 Any mini that retains the OE common sump gearbox configuration may reduce their weight by 50 lbs. Pierce aluminum cylinder head part #99003.843 allowed. Mini OHV 70.6 x 68.26 1071 Iron, nonCrossflow 2 Unrestricted 1330 Any mini that retains the
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OE common sump gearbox configuration may reduce their weight by 50 lbs. Pierce aluminum cylinder head part #99003.843 allowed. Mini OHV 64.516 x 83.82 1098 Iron, nonCrossflow 2 Unrestricted 1380 Any mini that retains the OE common sump gearbox configuration may reduce their weight by 50 lbs.
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
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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.
Thank you for your letter. At this time the CRB's intention is to monitor the FP/GTL cars comparing between the FP and GTL rule sets in order to achieve an accurate BOP. The CRB's goal is to get as much data as possible from the Runoff's and early 2025 season races. Participation will be paramount in achieving a proper BOP.
Thank you for your letter. The CRB's intention is to collect data starting early in 2025; if data shows that adjustments are needed for BOP they will be done quickly. The intention is an accurate BOP between both classes being combined.
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."
Request to Allow Direct Injection on Toyota G16E-GTS Engine
Thank you for your letter. May we direct you to a recent rule change concerning "direct injection" on GCR page #307 Section: n. Fuel Induction System 5.E.
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.
Thank you for your letter. All engines of 1375 cc and larger displacement must run a restrictor. You are welcome to modify your car to the full extent of the GTL rules. As for your IRS weight reduction request the current 2.5% IRS penalty has recently been reduced to 1.25%, please see letter #35012 in current 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."
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)
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!
Thank you for your letter. The CRB believes that although a weight reduction may be beneficial it is felt that other small bore cars besides the Nissans may be at their limit for what can be practically and safely removed to reach these lower weighs. Understand that this request must be applicable to all small bores.
The GT Advisory Committee is asking for help and ideas for "Modern Engines 1.9L and under" either "Full Prep" or "Limited Prep" that we can add to GTL! Please send suggestions and Spec's!
Monitor and Adjust small bore (under 1.4L) in GTLite
Thank you for your letter. One of your requests is not recommended, however, please see the "What do you think" letter #32948 that are in response to your other requests.
Request to Allow Volkswagen Direct Injected 1.4/1.6 Liter Engines
Thank you for your letter. The engines listed in your request are classified correctly within their parameters of displacement and number of valves within the GTLite class.
Thank you for your letter. This request is not recommended. Upon reviewing RUNOFF'S collected data, not all small bore GTLite cars are at the disadvantage that you refer to.
Request Use of Aftermarket Honda B16 Cylinder Head.
Thank you for your letter. Availability of the Honda B16 cylinder head seemed adequate. Additionally, it is unknown if this aftermarket part is more responsive to modification.
Request SCCA data boxes in ALL GTL cars, ALL sessions 2021 Runoff
Thank you for your letter. There will be a "Data Team" working the 2021 Runoff's. As there are 24 classes, all sharing the use of the same data boxes, data boxes being installed in one class for every track session is not possible.
Request to Allow Volkswagen Direct Injected 1.4/1.6 Liter Engines
Thank you for your letter. To date the only data that has been collected via SCCA data boxes was on Saturday 5-15-2021. During that session the Mazda's were third fasted in almost all sectors. Based on this data an adjustment is not warranted at this time. The CRB will continue to monitor the class.
Thank you for your letter. Parts may be interchanged as long as no modifications to either block or Cylinder head are necessary for fitment. VVT is not permitted.
GTL Honda B18a, B18b & B18c engine spec line correction
This is an advisory to GTL competitors using Honda B18a, B18b or B18c engines that a correction to this engines spec line has been made! It has been brought to the CRB's attention that combining heads and blocks of these three engines to build a "hybrid" engine may be taking place in GTL! It is not permitted to build such "hybrid" engines in any GT class unless it is specifically stated in the engine "spec line" notes.
Request to remove SIR restriction from Toyota 2TC in GTL
Thank you for your letter. Weight breaks or HP compensations are not given for any differences there may be between tub construction vs. tube frame cars.
In GCR, Section 9.1.2F.7.e.1., change the following: "Note that the exhaust outlet shall still be mounted as low as possible; this does not authorize exhaust outlets through the door."
Nissan MRA8DE Engine Inclusion to GTL list of Engines 1.8 liter
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).”
Thank you for your letter. The CRB does not recommend making changes to classifications based on the Runoffs track only - it does not represent the yearlong performance potential of a chosen car.
Request a weight penalty change for 15 inch wheels.
Thank you for your letter. The GTAC has reviewed these different tires with Goodyear, measured contact patch and the conclusion is the same; the 4% weight penalty is adequate as described
Thank you for your letter. The GTAC has reviewed these different tires with Goodyear, measured contact patch and the conclusion is the same; the 4% weight penalty is adequate as described.
The below items are not recommended. Request: FWD can use any type of rear suspension. The CRB does not recommend this change. Request: Allow for the reduction of the height of the upper leading edge of the roof to bring the body more into line with current GT vehicle body work and help increase straight line speed. The CRB does not recommend, since ALL cars must meet the factory silhouette as described in the GT rule set (GTCS). Request: Allow for engine updates that include a modern twin cam head such as KAD,
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Specialty Components or BMW. The CRB does not recommend this change. These cylinder heads have no corporate association to the BMC “A” series engine. It is known that BMW purchased ROVER and produces the BMW MINI but this corporate tie for using a BMW Motorcycle cylinder head is torturous.