Wording removed by a change is shown struck through, as in the original. 55 changes, 133 other letters.
Changes made
Spec Line Clean Up
#40344 from Josh Smith · Rule change · TB 26-07 (2026-07 Fastrack)
In STL Spec Lines, removed Mazda MX-5 Cup in its entirety. In STL Spec Lines, Mazda Spec MX5 Challenge, change as follows: Model: "Mazda Spec MX5 Challenge" Notes: "Must conform completely to GCR 9.1.7.1, except alternative tires (only) per STL regs allowed. May run 8" spec wheel. Tires per STL rules." In STL Spec Lines, Mazda MX-5 Global Cup (16-18), change as follows: Model: Mazda MX-5 Global Cup (16-18) Notes: "Must meet all MX-5 Global Cup rules."
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In STL Spec Lines, remove Mazda MX-5 Global Cup (2019) in its entirety.
Calculating Weight
#40224 from David Wessel · Rule change · TB 26-06 (2026-06 Fastrack)
In GCR, Section 9.1.4.1.H.6., change as follows: "The minimum weight is determined by the installed engine displacement, TIR or table spec line. It is to be used as the base weight for any chassis weight related adjustments. Chassis related All positive adjustments that are percentage based are performed by adding the total of all specified percentages first and subtracting the total of all negative specified percentages second if necessar y. Final step is addition or subtraction of specified weight in pounds." In GCR, Section 9.1.4.2.H.4., change as follows: "The minimum weight is determined by the installed engine displacement or table spec line. It is to be used as the base weight for any chassis weight related adjustments. Chassis related All positive adjustments that are percentage based are performed by
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adding the total of all specified percentages first and subtracting the total of all negative specified percentages second if necessary. Final step is addition or subtraction of specified weight in pounds."
In STL, Table A: Alternate Vehicle and Engine Requirements, add the following: Model: "Mazda BP 1.6" Maximum Displacement: "1600cc" Minimum Weight: "2160"
Weight adjustment for STL
#39579 from Super Touring Committee · Rule change · TB 26-01 (2026-01 Fastrack)
In GCR, Section 9.1.4.2.H.1. change Minimum Weight on chart as follows:
A specification table follows in the original; it is not shown here.
Lotus Weight Reduction
#38772 from Club Racing Board · Rule change · TB 25-08 (2025-08 Fastrack)
In 9.1.2. GT2/ST Spec Lines, Lotus Evora GT4, change Weight as follows: "2750 2700" In STU Table B: Alternate Vehicle and Engine Allowances, change Weight as follows: Lotus Elise Cup R: "2300 2250" Lotus Elise SC/ Lotus Exige SC: "2300 2550 2500 2450"
In STL Spec Lines, Table B, Mazda Spec MX5 Challenge, change as follows: Minimum Weight: "2500 See 9.1.7.1." Notes: "Mazda MX5 Challenge car must utilize the following components: Roush CNC cylinder head 0000-01-5300,Mahle standard or +0.005 0000-01-5310, OEM camshaft, 11:1 compression ratio, header 0000-06-5407-NC, exhaust 0000-06-5427-NC, cold air intake 0000- 06-5150-KT, ECU flash 0000-01-5379, Pagid front brake pads 0000-03-5104-SP or endurance pads 0000-03- 5104-EN, Pagid rear brake pads 0000-03-5114-SP or endurance pads 0000-03-5114-EN, Penske front shock 0000-04-5291-SA, Penske rear shock 0000-04-5292-SA, Penske rear mount kit 0000-04-5358, Front mount kit 0000-04-5359, Front offset bushing 0000-04-5407-NC, Eibach front springs 0000-04-9700-08, Eibach rear springs 0000-04-9400-07, Eibach helper springs 0000-04-
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9926, Eibach front sway bar 0000-04-5306-FT, Eibach rear sway bar 0000-04-5306-RR, Interior finish panels 0000-07-5822, C&R radiator/oil cooler assembly 0000-01-5504-CR, Oil cooler adapter and lines 0000-01-5511-KT, ACT clutch 0000-02-5004-G6, wheels 17x8 #0000-04-5706-GM, # 0000- 04-5706-SL, and Toyo RR 235-40-17 dry, Toyo RA1 235-40-17 wet. Alternative tires on 17x7 wheels per STL rules. No other Super Touring modifications or allowances permitted except as noted in this spec line. Must conform completely to GCR 9.1.7.1, except alternative tires (only) per STL regs allowed."
Request to Remove Miata Hubs from General category
#37138 from Christopher Childs · Rule change · TB 24-12 (2024-12 Fastrack)
In GCR, Section 9.1.4.M.18., change as follows: "18. Allow alternate front wheel front hubs, Mazda Motorsports Development Part #0000-04-5HUB-S1, for the 90-05 Mazda Miata: Mazda Motorsports Development Part #0000-04-5HUB-S1."
ST Electric-Assisted Steering Systems
#35066 from Jose Osiris Pena · Rule change · TB 24-02 (2024-01 Fastrack)
In GCR, Section 9.1.4.M.16., change as follows: "Power steering may be modified in any of the following ways: a. disconnected , pump, belt, pulley, and hoses may be removed. Hoses may also be looped. Steering rack or box may be modified internally to work without pump. b. an OEM manual steering rack for that model may be fitted c. an electric power steering pump may be fitted d. an OEM electric-assisted steering system may be used or any column mounted electric steering assist may be used e. an OEM hydraulic-assisted steering system may be used"
BOP Adjustments
#35112 from Super Touring Committee · Rule change · TB 24-02 (2024-01 Fastrack)
In GCR, 9.1.4.H.1., change as follows: "Minimum weights for cars with normally aspirated piston engines will be determined by 1.35 lbs/cc displacement for the installed engine (see the following table). Displacement is the factory displacement for the installed engine. For the purpose of weight assignment, engine displacement will be rounded to the nearest 50cc (e.g., 2176cc = 2200cc and 2175cc = 2150cc)." In GCR, 9.1.4.H.1., change Minimum Weight on Chart as follows: Factory Engine Displacement 1900: "Effective 3-1-24: 2565 2540" Factory Engine Displacement 1950: "Effective 3-1-24: 2633 2583"
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Factory Engine Displacement 2000: "Effective 3-1-24: 2700 2625" In GCR, 9.1.4.H.3., change as follows: "Front wheel drive cars with a strut type front suspension may reduce their minimum weight by 2.5 percent. Effective 3- 1-24: Front wheel drive cars with 95" or less wheelbase must add 1.25% to their minimum weight." In STL Spec Lines, change Notes as follows: Acura/Honda B16: "Effective 3-1-24: 53 51mm" Acura/Honda B17: "Effective 3-1-24: 53 51mm" Acura/Honda B18C1: "Effective 3-1-24: 53 51mm" Acura/Honda B18C (JDM Type R), B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R): "Effective 3-1-24:52 50mm" Mazda MZR: "Effective 3-1-24: 52 50mm"
Mazda 12A
#35320 from Super Touring Committee · Rule change · TB 24-02 (2024-02 Fastrack)
In STL Spec Lines, Table A, Mazda 12A, change Notes as follows: "The 5th and 6th intake port actuators and valves may be removed or disabled."
Alternate Carburetor Request for 79-85 RX7 12a
#35181 from Dan Sheppard · Rule change · TB 24-01 (2024-01 Fastrack)
In STL Table B: Alternate Vehicle and Engine Allowances, Mazda RX-7 12A (79-85), change Notes as follows: "Street Porting of the engine only. Bridge porting, peripheral porting, and eyelash porting are prohibited. Contact SCCA National Office for details of Street porting. Stock Nikki 4 bbl carburetor on a stock manifold only. or auto-type 2 bbl w/42mm choke(s) on a “dual-y” manifold. Allow the standard removal of emissions related components, and allow air and fuel jets to be corrected. Modification of the water jacket in the area of the spark plug for cooling purposes is permitted."
In STL Spec Lines, Table B: Alternate Vehicle and Engine Allowances, change Notes as follows: ITA-spec and ITS-spec RX7: "Must completely conform to ITCS specifications. Tires must conform to 9.1.4, Tires & Wheels. Tires must also conform to 9.1.4.2.Tires." ITS, ITA, ITB, or ITC vehicles (1985- ): "Must completely conform to ITCS specifications. Tires must conform to 9.1.4, Tires & Wheels. Tires must also conform to 9.1.4.2.Tires."
Spec MX5 in STL
#33473 from Tom Bogar · Rule change · TB 23-01 (2023-01 Fastrack)
In STL, Table B: Alternate Vehicle and Engine Allowances, Mazda Spec MX5 Challenge, change notes as follows: "ACT clutch 0000-02-5004-G6, wheels 17x8 #0000-04-5706-GM, # 0000-04- 5706-SL, and Toyo RR 235-40-17 dry, Toyo RA1 235- 40-17 wet. Alternative tires on 17x7 wheels per STL rules. No other Super Touring modifications or allowances permitted except as noted in this spec line."
Single TB Weight Modifiers
#31449 from John Weisberg · Rule change · TB 22-03 (2022-03 Fastrack)
Effective 5.1.2022 In STU, GCR Section 9.1.4.H.1., change as follows: "1. Minimum weights for cars with normally aspirated piston engines will be determined by 1.1 lbs/cc displacement for the installed engine (see following table) the following table. Displacement is the stock displacement for the installed engine. For the purpose of weight assignment, engine displacement will be rounded to the nearest 50cc (e.g., 2176cc = 2200cc and 2175cc = 2150cc)." Factory Engine Displacement (cc) Minimum Weight (lbs)
A specification table follows in the original; it is not shown here.
In STU Table B, Improved Touring Vehicles (1985-), change Notes as follows: "Must completely conform to ITCS requirements. Tires must conform to 9.1.4, Tires & Wheels" In STL Table B, ITA-spec and ITS-spec RX7, change Notes as follows: "Must completely conform to ITCS requirements. Tires must conform to 9.1.4, Tires & Wheels" In STL Table B, ITS, ITA, ITB, or ITC vehicles (1985- ), change Notes as follows: "Must completely conform to ITCS requirements. Tires must conform to 9.1.4, Tires & Wheels"
Throttling Device Clarification
#31323 from Jose de Miguel · Rule change · TB 22-01 (2022-01 Fastrack)
In GCR, Section 9.1.4.1.B.4., change as follows: "The intake and exhaust porting on piston engines is free. Porting of intake manifolds and cylinder heads is free on piston engines."
Mazda Renesis Restriction
#31467 from Christopher Childs · Rule change · TB 22-01 (2022-01 Fastrack)
In STL Spec Lines, Mazda Renesis, change Notes as follows: "55 60mm flat plate restrictor required."
Clarification of 79-85 RX7 Spec line
#31621 from Daniel Sheppard · Rule change · TB 22-01 (2022-01 Fastrack)
In STL, Mazda RX-7 12A (79-85), change notes as follows: "Stock Nikki 4 bbl carburetor on a stock manifold only. Allow the standard removal of emissions related components, and allow air and fuel jets to be corrected. Modification of the water jacket in the area of the spark plug for cooling purposes is permitted."
In STL, Mazda Spec MX-5, remove redundant spec line as follows: "Mazda Spec MX-5. 2000cc. 2600lbs. Must Comply with 2014 SCCA Spec MX-5 Regulations."
VW Engine Request
#30625 from PABLO GASTALDI · Rule change · TB 21-06 (2021-06 Fastrack)
In STL Spec Lines, classify Volkswagen 2.0L TFSI, as follows: STL Maximum Displacement (cc's) Minimum Weight Notes Volkswagen 2.0 TFSI 1984 Chart Engine Permitted with turbocharger removed. Must meet all other STL specifications.
Solstice Ride Height
#30183 from Tim DeRonne · Rule change · TB 21-05 (2021-05 Fastrack)
In STL Table B, Pontiac Solstice/SaturnSky, add to notes as follows: "4" ride height allowed."
In STL Table A, classify Mazda B5 DOHC as follows: STL Maximum Displacement (cc's) Minimum Weight Notes Mazda B5 DOHC Chart Must meet ALL STL regulations.
Honda B16A (JDM) Restrictor change
#30531 from Club Racing Board · Rule change · TB 21-05 (2021-05 Fastrack)
In STL Table B, Honda B16A (JDM), change notes as follows: "54 53mm"
ST Oil Coolers E&O Correction to 9.1.4.2.H
#30388 from Philip Royle · Rule change · TB 21-04 (2021-04 Fastrack)
In ST, section 9.1.4.G.14, change as follows: "Vents, breathers, and oil filters and oil coolers may be added, or substituted. All emission control devices may be removed and the resulting holes plugged."
GM Ecotec engines in STL
#30247 from Tim DeRonne · Rule change · TB 21-03 (2021-03 Fastrack)
In STL, Table B, change GM Ecotech LNF, as follows: "GM Ecotech LNF" In STL, Table B, GM Ecotech LNF, add to Notes as follows: "Any combination of GM Ecotech engine family permitted. Must use 55mm flat plate restrictor. Must meet all other STL specifications."
Super Touring Alternate Miata Hubs
#30345 from Club Racing Board · Rule change · TB 21-03 (2021-03 Fastrack)
In ST, GCR section 9.1.4.M, add alternate front wheel hubs as follows: "18. Allow alternate front wheel front hubs for the 90-05 Mazda Miata: Mazda Motorsports Development Part #0000-04-5HUB-S1"
Brake Component Relocation
#29990 from Christopher Childs · Rule change · TB 21-02 (2021-02 Fastrack)
In ST, Section 9.1.4.N.1., add the following: "ABS actuation hardware and wiring may be relocated anywhere within the engine compartment."
In GCR, Section 9.1.4.D.g, change as follows: "The trailing edge of the rear wing, including end plates and gurney flap, may be mounted no further rearward than the center of the rearmost part approved bodywork."
Transmission Options
#30118 from John Warren · Rule change · TB 21-02 (2021-02 Fastrack)
In STL, Section 9.4.1.2.C.2, change as follows: "Either the original transmission or an alternate transmission must be used; the alternate transmission must be from the same manufacturer as the vehicle (i.e., an Acura transmission may be installed in a Honda car). Alternate transmissions must be used in their entirety; any OEM gear sets (drive and driven gear pairs) that fit w/o any modifications to gears, shafts, and/or case are permitted. Modifications to input shafts for fitment are allowed."
Request for FWD and RWD Parity
#29728 from Tom Fowler · Rule change · TB 21-01 (2021-01 Fastrack)
In STL, GCR Section 9.1.4.2.H.2, change as follows: "Rear wheel drive cars with strut front suspension must add 3 0.5 percent to their baseline STL weight. All other rear wheel drive cars must add 5.5 2.5 percent to their standard baseline STL weight."
Request to Remove Honda F20C 2% Weight Penalty
#29815 from David Mead · Rule change · TB 21-01 (2021-01 Fastrack)
In STL Spec Lines, Honda F20C, change Minimum Weight as follows: "Chart + 2%"
Request for FWD and RWD Parity
#30023 from Club Racing Board · Rule change · TB 21-01 (2021-01 Fastrack)
In STL, Table A, Acura/Honda B16, change Notes as follows: "54 53mm flat plate restrictor required." In STL, Table A, Acura/Honda B17, change Notes as follows: "54 53mm flat plate restrictor required." In STL, Table A, Acura/Honda B18C1, change Notes as follows: "54 53mm flat plate restrictor required." In STL, Table A, Acura/Honda B18C (JDM Type R), B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R), change Notes as follows:
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"53 52mm flat plate restrictor required." In STL, Table A, Mazda MZR, change Notes as follows: "53 52mm flat plate restrictor required."
Request clarification on wing measurement
#29640 from Jose De Miguel · Rule change · TB 20-12 (2020-12 Fastrack)
IN ST, GCR Section 9.1.4.D.4.e, add the following: "Unless otherwise specified in the applicable rules the measurement of aero dynamic devices and reference areas shall include end plates but not include fasteners as long as the fasteners serve no other purpose. Fasteners may protrude no more than 1/2” from the mounting surface."
Minimum Weight Determination
#27695 from David Fiorelli · Rule change · TB 20-08 (2020-08 Fastrack)
In STU, GCR section 9.1.4.10., add the following: "All weight adjustments for engines shall be applied first, then that total is to be used as the baseline for any chassis-related weight adjustments. Chassis related adjustment that are percentage based are performed by adding specified percent first and subtracting specified percentage second if necessary. Final step is addition or subtraction of specified weight in pounds." In STL, GCR Section 9.1.4.4., add the following: "All weight adjustments for engines shall be applied first, then that total is to be used as the baseline for any chassis-related weight adjustments. Chassis related adjustment that are percentage based are
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performed by adding specified percent first and subtracting specified percentage second if necessary. Final step is addition or subtraction of specified weight in pounds."
In GCR section 9.1.4.D.4, clarify wording as follows: "d. Wings shall be a single element with a maximum chord length of 8.50 inches, including any wicker Gurney flap." "f. The entire rear wing assembly, including the end plates and any wicker Gurney flap, shall be mounted a minimum of 6.0 inches below the peak of the roof or roll cage main hoop whichever is higher, measured at the highest point. Cars with a wagonback/notchback/hatchback style body may have the rear wing assembly, including the end plates and any wicker Gurney flap, mounted a maximum of 4.0inches above the highest point of the roof."
Request for Addition to GT3 Approved Turbo List
#27576 from Chris Edens · Rule change · TB 20-07 (2020-08 Fastrack)
In GT3, GCR section 9.1.2.F.7.h.6., add turbocharger as follows: "d. Borg-Warner EFR6258" In STU, GCR section 9.1.4.1.H.5, add turbocharger as follows: "- Borg-Warner EFR6258"
Request to add 2016-2019 GMX-5 Spec line
#28604 from Josh Smith · Rule change · TB 20-06 (2020-06 Fastrack)
In STL, classify the Mazda MX-5 Global Cup (16-18) as follows: STL Maximum Displacement (cc's) Minimum Weight Notes Mazda MX-5 Global Cup (16-18) 2000 2450 Must meet all MX-5 Global Cup rules. Any OEM or aftermarket
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hardtop is permitted that retains the OEM silhouette. If a hardtop is used, latches shall be replaced with positive fasteners. OBD2 requirement does not apply. Ballast box may be removed. Tires per STL rules. In STL, classify the Mazda MX-5 Global Cup (2019) as follows: STL Maximum Displacement (cc's) Minimum Weight Notes Mazda MX-5 Global Cup (2019) 2000 2550 Must meet all MX-5 Global Cup rules. Any OEM or aftermarket hardtop is permitted that retains the OEM silhouette. If a hardtop is used, latches shall be replaced with positive fasteners. OBD2 requirement does not apply. Ballast box may be removed. Tires per STL rules.
In STL, Mazda MX-5 / Club Model (06-15), make changes as follows: "Allow Mazda header part number 0000-06-5407-NC."
Correction - Clarification Honda/Acura B18B engine Letter # 26209
#28873 from Club Racing Board · Rule change · TB 20-06 (2020-06 Fastrack)
In STL, Table A, Acura/Honda B18 (except C engine) change as follows: "Acura/Honda B18 (except C1 engine)" In STL, Table A, Acura/Honda B18 (except C engine) change Notes as follows: "53 54mm" In STL, Table A, Acura/Honda B18C (JDM Type R), B18C1, B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R) change as follows: "Acura/Honda B18C (JDM Type R), B18C1, B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R)"
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In STL, Table A, Acura/Honda B18C (JDM Type R), B18C1, B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R)) change Notes as follows: "54 53mm"
STL Honda B18 restrictor changes
#28794 from Club Racing Board · Rule change · TB 20-05 (2019-05 Fastrack)
In STL Spec Lines, Honda B18, change as follows: "53mm flat plate restrictor required." In STL Spec Lines, change as follows: "Acura/Honda B18C (JDM Type R), B18C1, B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R)" In STL Spec Lines, Acura/Honda B18C (JDM Type R), B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R), change notes as follows: "Any porting and or polishing of intake and or exhaust ports outside of the 1” port matching allowance,
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factory or otherwise, is prohibited. Must meet all other STL specifications. 54 53mm flat plate restrictor required." In STL, Acura/Honda B18C1, add Spec Line as follows: STL Maximum Displacement (cc's) Minimum Weight Notes Acura/Honda B18C1 Chart 54mm flat plate restrictor required.
Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0
#27884 from David Mead · Rule change · TB 20-04 (2020-04 Fastrack)
In STU, GM Ecotech LNF Spec Lines, add to Notes as follows: “LNF Engine Permitted with turbocharger removed. LNF Engine short block with LE5 cylinder head and intake manifold permitted. Must meet all other STL specifications.”
Acura/Honda B18C engine chart. Reduce the current 54 mm flat plat
#28663 from Club Racing Board · Rule change · TB 20-04 (2020-04 Fastrack)
In STL, Mazda MZR Table A, change the restrictor size in the notes as follows: "54 53mm"
Mazda MZR engine chart. Reduce the current 55 mm flat plate to 53
#28664 from Club Racing Board · Rule change · TB 20-04 (2020-04 Fastrack)
In STL, Mazda MZR Table A, change the restrictor size in the notes as follows: "55 53mm"
In STL, Mazda Spec MX5 Challenge, add wheel part numbers to the notes as follows: "0000-04-5706-GM, 0000-04-5706-SL"
Request to Classify Spec MX-5 Challenge in STL
#27399 from Josh Smith · Rule change · TB 19-10 (2019-10 Fastrack)
In STL, classify the Mazda Spec MX5 Challenge as follows:
A specification table follows in the original; it is not shown here.
Request clarification for manifold and throttle in STU
#27004 from Jose De Miguel · Rule change · TB 19-07 (2019-07 Fastrack)
In STU, GCR section 9.1.4.1.B.3, make changes as follows: "All cars shall use the installed engine’s or vehicle's stock air throttling device (e.g., throttle body, carburetor) and intake manifold, unless noted otherwise. Alternate intake manifolds will be permitted on a case-by-case basis."
Request Restrictor Plate correction
#26779 from Jose De Miguel · Rule change · TB 19-06 (2019-06 Fastrack)
9.1.4.2 Table A, Acura/Honda B18 (except C engine), make changes to notes as follows: "53 54mm flat plate restrictor required."
In GCR Appendix K.F.5, add as follows: “Ride height will be measured without driver at the lowest point of the rocker panel, not including the pinch weld.” In GCR section 9.1.4.F.5, add as follows: “Ride height will be measured without driver at the lowest point of the rocker panel, not including the pinch weld.”
In STL, classify the VW 20V 1.8 in Table B as follows: STL Maximum Displacement (cc’s) Minimum Weight Notes VW 1.8L R4 20VT 1781 Chart Engine Permitted with turbocharger removed. Must meet all other STL specifications
Request to reduce weight of RX8 with Renesis rotary
#25781 from DAVID MEAD · Rule change · TB 19-03 (2019-03 Fastrack)
In STL, Mazda Renesis, change the weight as follows: “2800 2700”
In STL, Mazda MX-5 Cup, add to the notes as follows: “Tires per STL regulations. Brake pad compound are open.”
Request to clarify B18C1 GSR Honda B motor table
#26209 from Mike Taylor · Rule change · TB 19-03 (2019-03 Fastrack)
In STL, add Acura/Honda B18C1 to Table A as follows: STL Maximum Displacement (cc’s) Minimum Weight Notes Acura/Honda B18C1 Acura/Honda
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B18C (JDM Type R), B18C5 (USDM Type R), B18C6 (UK and Euro Type R), B18C7 (Australia Type R) Chart Any porting and or polishing of intake and or exhaust ports outside of the 1” port matching allowance, factory or otherwise, is prohibited. Must meet all other STL specifications. 54mm flat plate restrictor required.
Port Matching
#26415 from Super Touring Committee · Rule change · TB 19-03 (2019-03 Fastrack)
In STL, Mazda 12, table A, strike the wording in the notes as follows: “No porting or port matching is permitted.” In STL, Mazda 13B, table A, strike the wording in the notes as follows: “No porting or port matching is permitted.”
Request to equalize FPR Reduction on all B-Series Vtec Engines
#24746 from Eric Kutil · Rule change · TB 19-01 (2019-01 Fastrack)
In STL, Table A, Acura/Honda B17, add to the notes as follows: “54mm flat Plate restrictor required.” In STL, Table A, Acura/HondaB18C(JDM Type R),B18C5(USDM Type R),B18C6(UK and Euro Type R),B18C7(Australia Type R), make changes to weight and notes as follows: “Chart + 2% Chart” “Effective 03/01/2018, 53 54mm flat plate restrictor required.”
In STL, Mazda Miata, delete the maximum displacement (cc’s) and correct the minimum weight as follows:
Other letters
Inclusion of Letter Writer.
#40108 from John Weisberg · Not recommended · Minutes (2026-06 Fastrack)
Due to time restraints, it would not be practical to include every letter writer to the monthly zoom calls and manage bringing them in and removing them for just the discussion of their letter.
Feedback on 1.6L Miata Weight
#40065 from Rich Grunenwald · No action required · Minutes (2026-05 Fastrack)
Thank you for your comments. We're glad to hear that a 1.6L competitor feels the weight adjustment was successful in increasing parity.
Request for STL Rule Review – Aftermarket Dash Allowance
#39450 from Lisa Keyes · Recommended to the Board · Minutes (2026-01 Fastrack)
In GCR, Section 9.1.4.E.6., change as follows: "Stock d Dash/instrument panel cover (dash pad) must be used which fully encloses instrument wiring and mechanical components. Original instruments/gauges may be replaced, or supplemented, with additional engine monitoring gauges. Accessories, lights and switches may be added or removed. Box-type extensions from the dash pad may be used to mount switches and controls, in the areas where the OEM insert panels were mounted, so that they more easily accessible to the driver. Audio and video systems may be removed. In GCR, Section 9.1.4.E.8., change as follows: "8. Dash pad modification – It is permitted to modify the dash pad in order to run the roll cage tubes through the dash area as
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long as the dash pad is modified only enough for roll cage fitment. If necessary, the dash pad may be parted to ease installation around roll cage. Any such parting shall be done in such a way as to minimize the appearance that they have been separated once pieces of dash pad are installed."
STL Ride Height
#39382 from Stephen Blethen · Not recommended · Minutes (2026-01 Fastrack)
Not consistent with class philosophy.
Request weight adjustment in STL
#39318 from Charles Mathes · Taken care of · Minutes (2026-01 Fastrack)
#39243 from Jonathan Lugod · Not recommended · Minutes (2025-12 Fastrack)
We appreciate your perspective and feedback. Not consistent with class Philosophy.
Extended Ball Joints Clarification
#39199 from Matt Phillips · No action required · Minutes (2025-12 Fastrack)
We appreciate your perspective and feedback. Extended Ball Joints are not allowed in STL, however, SM cars which may run Extended Ball Joints may run in STL, must adhere to SM rules.
Wheel Width Request
#39057 from Harley Kaplan · Not recommended · Minutes (2025-12 Fastrack)
We appreciate your perspective and feedback. Not consistent with class Philosophy.
99-05 intake manifold on the BP 1.8L engines
#38501 from Nick LeVerone · No action required · Minutes (2025-09 Fastrack)
Thank you for your letter. You are allowed to run a 99-05 intake manifold that goes with the engine or the chassis as stated in 9.1.4.G.1.e.
Rear Wing Measurements
#38091 from Ethan Swindel · Not recommended · Minutes (2025-05 Fastrack)
Thank you for your letter. The rule is adequate as written.
Mazda Miata 13 B
#37968 from Raymond Philibert · Not recommended · Minutes (2025-04 Fastrack)
Thank you for your letter. We do not feel any additional actions are required.
Dash pad/ Dashboard Requirements
#37929 from Sylvester Stafford · No action required · Minutes (2025-04 Fastrack)
Thank you for your letter. Rule is adequate as written and does not specify model year.
ABS within Manufacturer
#37844 from Nick Leverone · Recommended to the Board · Minutes (2025-04 Fastrack)
In GCR, Section 9.1.4.N., add the following: "(Effective 6/1/2025) 12. Any OE ABS System from the same manufacturer may be used."
Body Parts Interchangeability
#37474 from Super Touring Committee · Recommended to the Board · Minutes (2025-04 Fastrack)
In GCR, Section 9.1.4.C.1., change as follows: "(Effective 6/1/2025) Unless otherwise allowed, standard body appearance must be strictly maintained. Different models of the same generation chassis may interchange body panels, trim and lights."
Super Touring Throttle Body Clarification
#37581 from Adam Sargis · Recommended to the Board · Minutes (2025-02 Fastrack)
In GCR, Section 9.1.4.G.8, change as follows: "(Effective 4/1/2025) Cars produced with an electronic throttle body may use the OEM electronic throttle body. The OEM electronic throttle body may be converted to manual actuation and the actuation cam on a manual throttle body may be changed to alter the opening/closing rate of the butterfly. Alternately actuated throttle bodies may be considered on a case by case basis. Vehicle/engine combinations with manual OEM throttle bodies may be converted to an OEM electronic throttle body of the same inner diameter as the original OEM throttle body. An 1" thick adapter plate may be used to facilitate mounting."
Hood Louvers in STL
#37562 from Caleb Patrie · Recommended to the Board · Minutes (2025-02 Fastrack)
In GCR, Section 9.1.4.C., add the following: "(Effective 4/1/2025) 15. Hoods may have a maximum of 2 vents installed for cooling purposes. Cars with mid or rear engines may have a maximum of 2 vents located in the hood or fenders for cooling purposes. The maximum combined total area of the vents shall not exceed 200 square inches. The 200 Square inches includes any area that deviates from the factory hood profile or fender(s). Louvers within the 200 sq. inch are allowed. Louver vents that are OEM do not count in the number of vents allowed or 200 square inch allowance." In GCR, Section 9.1.4.1.A.2. delete in its entirety and renumber. "(Effective 4/1/2025) 2. Hoods may have a maximum of 2 vents installed for cooling purposes. Cars with mid or rear engines may
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have a maximum of 2 vents located in the hood or fenders for cooling purposes. The maximum combined total area of the vents shall not exceed 200 square inches. The 200 Square inches includes any area that deviates from the factory hood profile or fender(s). Louvers within the 200 sq. inch are allowed. Louver vents that are OEM do not count in the number of vents allowed or 200 square inch allowance."
GCR STL Model Year Question
#37501 from Bryan Heitman · Not recommended · Minutes (2025-02 Fastrack)
Thank you for your letter. The car's Motorsport ABS and sequential transmission are outside of the STL class philosophy. The car is eligible in EP, STU or T3.
remove wording from 9.1.4.2 D3
#37452 from Super Touring Committee · Recommended to the Board · Minutes (2025-01 Fastrack)
In GCR Section, 9.1.4.2.D.3. change as follows: "Unless otherwise allowed in these regulations, no other relocation or reinforcement of any suspension component or mounting point is permitted."
Sunroof Wording
#37402 from John Weisberg · No action required · Minutes (2025-01 Fastrack)
Thank you for your letter. Please see GCR Section 9.3.17. DETACHABLE PANELS/SUNROOFS for clarification.
Request to add ITR to STL
#37386 from Raymond Blethen · Not recommended · Minutes (2025-01 Fastrack)
Thank you for your letter. Request is not within the class philosophy of the class.
Change Maximum Rotor Size from 300mm to 325mm
#37384 from Raymond Blethen · Not recommended · Minutes (2025-01 Fastrack)
Thank you for your letter. Request is not within the class philosophy of the class.
Fender Flare Language Revisited
#37088 from Eric Heinrich · Not recommended · Minutes (2024-12 Fastrack)
Thank you for your letter. Rule language is adequate, no action required.
Allow a weight break for competitors using 180+ treadwear tires
#36636 from John Weisberg · Not recommended · Minutes (2024-12 Fastrack)
Thank you for your letter.
Tires Allowances
#36696 from Derek Ketchie · No action required · Minutes (2024-10 Fastrack)
Thank you for your letter. This is a topic we are considering and are currently discussing.
Front End Bodywork Swaps
#36190 from Ethan Swindel · Not recommended · Minutes (2024-07 Fastrack)
Thank you for your letter. Request is not consistent with class philosophy.
Question Regarding Valve Seat Angle & Seat Spacer
#35961 from Bill Damron · Not recommended · Minutes (2024-05 Fastrack)
Thank you for your letter. We allow valve seat angle to be open but a spacer is a separate part and not encompassed in our open seat angle allowance.
Miata B6T Cylinder Head Request
#35880 from Kyle Freiheit · Not recommended · Minutes (2024-05 Fastrack)
Thank you for your letter. The use of the B6T cylinder head in STL is not consistent with class philosophy.
OEM Brake Rotor Diameter
#35688 from Caleb Patrie · Not recommended · Minutes (2024-04 Fastrack)
Thank you for your letter. Request is not consistent with class philosophy.
Opposition to Recent Changes
#35544 from Jose Osiris Pena · No action required · Minutes (2024-03 Fastrack)
Thank you for your letter. Please see letter #35492 in current Fastrack.
Against Proposed Super Touring Light Changes in Feb Prelim TB
#35499 from Jose de Miguel · No action required · Minutes (2024-03 Fastrack)
Thank you for your letter. Please see letter #35492 in current Fastrack.
Fastrack TB 24-02
#35498 from Eliezer Torres · No action required · Minutes (2024-03 Fastrack)
Thank you for your letter. Please see letter #35492 in current Fastrack.
Fastrack TB 24-02
#35497 from Eliezer Torres · No action required · Minutes (2024-03 Fastrack)
Thank you for your letter. Please see letter #35492 in current Fastrack.
BOP Adjustments in February Preliminary Tech Bulletin
#35494 from Sean Duncan · No action required · Minutes (2024-03 Fastrack)
Thank you for your letter. Please see letter #35492 in current Fastrack.
STL Honda Changes
#35493 from Javier Rodriguez · No action required · Minutes (2024-03 Fastrack)
Thank you for your letter. Please see letter #35492 in current Fastrack.
Honda Changes.
#35492 from Johan Divison · No action required · Minutes (2024-03 Fastrack)
Thank you for your letter. The STAC is confident that recent changes to the Mazda MZR and Honda vehicles are directionally correct. The STAC will continue to collect data, evaluate BOP, and make changes as needed in STL.
Request for Adjustments
#35015 from Chris Childs · Taken care of · Minutes (2024-01 Fastrack)
Thank you for your letter. Please see letter #35112 in current Fastrack.
Request for Inclusion of Spoiler in Rules for Wings
#35090 from Bill Damron · Not recommended · Minutes (2023-12 Fastrack)
Thank you for your letter.
Allow Replacement of Bumper reinforcement with Aftermarket
#35089 from Sean Duncan · Not recommended · Minutes (2023-12 Fastrack)
Thank you for your letter. Rule is adequate as written.
Request for Spec Line of Toyota 2zz in STL
#35004 from Bill Damron · No action required · Minutes (2023-12 Fastrack)
Thank you for your letter. This engine doesn't require a spec line. It falls under 2.0 L and is normally aspirated. It is 11.5:1 compression so it has to have the compression lowered when prepared or take the weight penalty of 1.5% as outlined in 9.1.4.2.B.4a. The lift on the intake cam is also greater than .425 so it could be modified to meet our spec or take the weight penalty as outlined in 9.1.4.2.B.5.a.
STU split into STU and STO
#33484 from Nick Leverone · Not recommended · Minutes (2023-05 Fastrack)
Thank you for your letter.
Clarify Base Weight Usage vs Minimum Weight Usage
#33457 from David Fiorelli · Taken care of · Minutes (2023-05 Fastrack)
Thank you for your letter. Please see letter #33888 in April 2023 Fastrack.
Engine Penalties Removal Request for the Toyota 86/FRS/BRZ
#33618 from Olivier Jean-Francois · Not recommended · Minutes (2023-03 Fastrack)
Thank you for your letter. Not consistent with class philosophy.
13B Engine- Allow Turbo Engine Intake Manifold
#33646 from Alex Lozano · Not recommended · Minutes (2023-02 Fastrack)
Thank you for your letter. Please see ST general rules 9.1.4.G.1.e.2.. If the adaptor plate solution is not possible, please send in another letter.
Allow Racing Beat Street Port on 13B Engine
#33645 from Alex Lozano · Not recommended · Minutes (2023-02 Fastrack)
Thank you for your letter. Request is against class philosophy.
LS-VTEC for STL?
#33576 from Deacon Greenfield · Not recommended · Minutes (2023-01 Fastrack)
Thank you for your letter. Your request is not allowed in STL.
Request Dash panel rule change
#33512 from George Marsanick · Not recommended · Minutes (2023-01 Fastrack)
Thank you for your letter. Your request is not consistent with ST class philosophy.
Request to clarify front bumper rule
#33245 from David Mead · Not recommended · Minutes (2022-12 Fastrack)
Thank you for your letter. Rule is adequate as written.
Ball Joint Request
#33048 from Brian Hooper · Not recommended · Minutes (2022-10 Fastrack)
Thank you for your letter. This modification is not consistent with the STL philosophy.
Alternate/Aftermarket Subframe
#32239 from Matt Rooke · Not recommended · Minutes (2022-04 Fastrack)
Thank you for your letter. Your request is inconsistent with class philosophy.
9.1.4.H Revisions
#31876 from Greg Amy · No action required · Minutes (2022-02 Fastrack)
Thank you for your letter.
Alternate Dash in STL
#31792 from Louis Boustani · Not recommended · Minutes (2022-02 Fastrack)
Thank you for your letter. Not recommended at this time.
FRS/BRZ/86 Competitive Disadvantage in STL
#31758 from Denny Stripling · Not recommended · Minutes (2022-02 Fastrack)
Thank you for your letter. Your request is not consistent with class rules, however, the committee believes there are other changes that could be made to make the car more competitive that are within class rules.
Stop Eroding the Philosophy of the Class!
#31731 from Matt Blehm · No action required · Minutes (2022-01 Fastrack)
Thank you for your letter.
Additional to #31712
#31713 from Oscar Jackson · Not recommended · Minutes (2022-01 Fastrack)
Thank you for your letter. Your request is not consistent with class philosophy.
Remove Engine Manufacturer Match Requirement
#31712 from Oscar Jackson · Not recommended · Minutes (2022-01 Fastrack)
Thank you for your letter. Your request is not consistent with class philosophy.
Requesting Super Touring U
#31710 from Greg Amy · No action required · Minutes (2022-01 Fastrack)
Thank you for your letter.
Approve BMW N45B20 2.0L 11:1 Non-USDM Engine for STL
#31648 from Eric Heinrich · Not recommended · Minutes (2022-01 Fastrack)
Thank you for your letter. Please see 9.1.4.G.2. which provides a very specific list of information (VTS, shop manual etc) which must be provided to request a non USDM engine for consideration.
Request for Intake Porting Clarification
#31646 from Eric Heinrich · No action required · Minutes (2022-01 Fastrack)
Thank you for your letter. Please see letter #31323 in current Fastrack.
Wheel Width Allowance
#31541 from Austin Hilliard · Not recommended · Minutes (2022-01 Fastrack)
Thank you for your letter. In the interest of class stability, your request is not recommended.
Air Intake for Throttle
#31322 from Jose de Miguel · No action required · Minutes (2022-01 Fastrack)
Thank you for your letter. Please see response to letter #31328 in current Fastrack.
Sr20DE Reclassification Request
#31188 from Paul McNamara · Not recommended · Minutes (2022-01 Fastrack)
Thank you for your letter. Please see 9.1.4.G.2. which provides a very specific list of information (VTS, shop manual etc) which must be provided to request a non USDM engine for consideration.
Request alternate Miata hubs
#31158 from Christopher Childs · No action required · Minutes (2022-01 Fastrack)
Thank you for your letter. Front hub was submitted in the General Rules so that it applied to both STL and STU.
Dry Sump in STL
#31157 from PABLO GASTALDI · Not recommended · Minutes (2022-01 Fastrack)
Thank you for your letter. Dry Sumps are legal in STU. The STAC and CRB does not feel Dry Sumps should be included in STL at this time.
Sunset Spec MX-5 Class Regional only ruleset
#31115 from SCCA Staff · Recommended to the Board · Minutes (2021-10 Fastrack)
In GCR section 9.1.11, remove Spec MX-5 Regional only rules from the GCR as follows: Remove Spec MX-5 ruleset and place on SCCA website in technical forms and Downloads. Former SM5 cars are classified in T4 and STL. In STL, Mazda MX-5 Cup, add link to the SM5 ruleset in the Notes as follows: "SM5 rules can be found here - https://www.scca.com/pages/technical-forms-and-downloads."
Clarification to SM Spec Line
#30681 from JJ Servis · No action required · Minutes (2021-07 Fastrack)
Thank you for your letter. You must run a Spec Miata wheel and any STL compliant tire.
Classification Request
#30404 from Tom Rogers · Not recommended · Minutes (2021-04 Fastrack)
Thank you for your letter. The ST class is built around widely available components, not designed for specialty engines.
Please fix E&O for oil coolers in ST*
#30394 from Matt Blehm · No action required · Minutes (2021-04 Fastrack)
Thank you for your letter. Please refer to letter #30388 in current Fastrack.
Move Letter #21441 to ST General
#30069 from Eric Thompson · Not recommended · Minutes (2021-04 Fastrack)
Thank you for your letter. If you have an issue with a specific model, we would consider considering issues specifically, not in general.
Alternate Miata Hubs
#30052 from Michael Kamalian · Not recommended · Minutes (2021-04 Fastrack)
Thank you for your letter. Request is not recommended due to being outside of class philosophy. Alternate material hubs are not an approved modification.
Remove Honda B16A (JDM) from Table B
#30298 from Club Racing Board · Recommended to the Board · Minutes (2021-03 Fastrack)
In STL Table B, remove the Honda B16A (JDM) spec line in its entirety.
13B Turbo Engine Clarification
#30186 from Matt Rooke · No action required · Minutes (2021-03 Fastrack)
Thank you for your letter. The rule is clear as written. The 13B Turbo engine is allowed as well as everything inside the motor.
Request to Allow Other General Motors Ecotec Engines
#30182 from Tim DeRonne · No action required · Minutes (2021-03 Fastrack)
Thank you for your letter. Please see letter #30247 in current Fastrack.
Request to add SRO TC America TCA BRZ racing in STL
#29585 from KEVIN ANDERSON · Not recommended · Minutes (2021-03 Fastrack)
Thank you for your letter. Car can be run as is in STU or in STL by being compliant with the STL ruleset.
BoP Adjustment Request in STL
#29321 from Josh Smith · No action required · Minutes (2021-03 Fastrack)
Thank you for your letter. Significant changes have been made over the last few months. We will continue to monitor the class.
Opposed to Letter #30119
#30129 from PEDRO J COLON · Not recommended · Minutes (2021-02 Fastrack)
Thank you for your letter. Rules are adequate as written.
Recent RWD weight adjustments in STL
#30119 from Christopher Childs · Not recommended · Minutes (2021-02 Fastrack)
Thank you for your letter. Recent changes are less than you originally requested. Rule is adequate as written.
Alternate Bumper Beams in Super Touring
#30114 from Greg Maloy · Not recommended · Minutes (2021-02 Fastrack)
Thank you for your letter. Your request is not consistent with class philosophy.
STL FWD Discrepancy
#29995 from Kevin Koelemeyer · No action required · Minutes (2021-02 Fastrack)
Thank you for your letter. Please refer to the January 2021 Fastrack.
ABS Brakes
#29989 from Christopher Childs · No action required · Minutes (2021-02 Fastrack)
Thank you for your letter. ABS systems may be added to cars not originally equipped. The ABS system must be of the same manufacturer as the car it is being added to and be a street car production system. Non ABS weight break does not apply.".
Adjust the Size of the Restrictor for the Honda B16, B17, and B18
#29987 from Christopher Childs · No action required · Minutes (2021-02 Fastrack)
Thank you for your letter. Please refer to January Fastrack for restrictor updates.
Request adjustments for 2021 Toyota Supra
#29659 from Ryan Saari · Not recommended · Minutes (2021-02 Fastrack)
Thank you for your letter. Your request is not consistent with the ST rule package.
Rear Wheel Drive Weight Penalty Removal Request
#29932 from Louis Boustani · Taken care of · Minutes (2021-01 Fastrack)
Thank you for your letter. Please see letter #29728 in current Fastrack.
Request for Removal of Restrictor Plate From RX8
#29800 from David Zink · Not recommended · Minutes (2021-01 Fastrack)
Thank you for your letter. We are interested in seeing the car race and collecting data for future BoP. Please request SCCA to collect data on the performance of the car in events that you will be participating in.
Reinstate 55 mm Flat Plate Restrictor
#29766 from Jose De Miguel · Not recommended · Minutes (2021-01 Fastrack)
Thank you for your letter. Please refer to letter #29728 in current Fastrack for BoP adjustments.
RX8 restrictor plate
#29720 from Kristina Etherington · Not recommended · Minutes (2021-01 Fastrack)
Thank you for your letter. We are interested in seeing the car race and collecting data for future BoP. Please request SCCA to collect data on the performance of the car in events that you will be participating in.
Remove 55mm Restrictor Plate from RX8 Renesis Motor in STL
#29675 from Steven Zink · Not recommended · Minutes (2021-01 Fastrack)
Thank you for your letter. We are interested in seeing the car race and collecting data for future BoP. Please request SCCA to collect data on the performance of the car in events that you will be participating in.
Request Car /classification
#29146 from Raphael Assuncao · No action required · Minutes (2021-01 Fastrack)
Thank you for your letter. We attempted to reach the letter writer with no response.
Tire for Spec Mx-5 Challenge
#29521 from Richard Astacio · Not recommended · Minutes (2020-12 Fastrack)
Thank you for your letter. Toyo tires are part of the Spec MX-5 Challenge ruleset.
Request to create a flat plate restrictor size/engine displ table
#26402 from John Weisberg · Member feedback requested · Minutes (2020-12 Fastrack)
The Club Racing Board requests class stakeholder input on considered throttle body changes in the ST class. Please reply via the CRB letter log system. 1. Should ST standardize a throttle body size per displacement? Or per class? 2. Should individual throttle bodies be allowed in all STU engines with a weight penalty?
Request to Remove Rear Wheel Drive Penalty
#29300 from Harley Kaplan · Not recommended · Minutes (2020-10 Fastrack)
Thank you for your letter. We will continue to monitor and collect data.
Request to Change Weight Calculation
#29190 from Christopher Childs · Not recommended · Minutes (2020-09 Fastrack)
Thank you for your letter. The committee is investigating potential BoP weight adjustments at a future time.
Request for STL Parity
#29087 from Thomas Fowler · Not recommended · Minutes (2020-09 Fastrack)
Thank you for your letter. We will continue to collect data and monitor the class. The limited racing in 2020 has not given us the amount of data to make an educated decision.
STL 13B Base Weight
#28989 from Jose Garcia · Not recommended · Minutes (2020-09 Fastrack)
Thank you for your letter. We will continue to monitor and make BoP adjustments as necessary.
Request to remove BMW S14B20 factory ported head
#28798 from Christopher Jurkiewicz · Recommended to the Board · Minutes (2020-06 Fastrack)
In STL, Table B, remove BMW S14B20.
2019 Mazda MX-5 Global Cup Miata
#28651 from Darrel Stein · Not recommended · Minutes (2020-06 Fastrack)
Thank you for your letter. Please see letter #28604 in June 2020 Fastrack.
Request to Remove Restrictor Plate From B16 and B18 Engines
#27939 from Jose De Miguel · No action required · Minutes (2020-06 Fastrack)
Thank you for your letter. Please see letter #28794 in the May 2020 Fastrack.
Request to Omit 9.1.11. SPEC MX-5 CLASS
#28598 from Josh Smith · Not recommended · Minutes (2020-04 Fastrack)
Thank you for your letter. The CRB does not recommend removing Spec MX5 from STL at this time.
Re: #27532 tire widths - smart call, support response
#28549 from Eric Heinrich · No action required · Minutes (2020-04 Fastrack)
Thank you for your letter.
Air Dam Mounting Clarification
#28391 from Spencer Clark · No action required · Minutes (2020-04 Fastrack)
Thank you for your letter. Air dams may be mounted between the splitter and bumper cover.
Radiator Ducting
#28390 from Spencer Clark · No action required · Minutes (2020-04 Fastrack)
Thank you for your letter. Radiator grills may be modified to allow more air flow.
Bumper Grille Removal
#28388 from Spencer Clark · No action required · Minutes (2020-04 Fastrack)
Thank you for your letter. Front bumper grills may be opened for ducting.
Rear Camber Arms
#28331 from Tom Fowler · Not recommended · Minutes (2020-04 Fastrack)
Thank you for your letter. Current STL control arm rules are sufficient.
Request to classify a 2006 E90 325 with S54 driveline
#26821 from Andrew Conner · No action required · Minutes (2020-04 Fastrack)
Thank you for your letter. The BMW E90 chassis and S54 engine are currently allowed in STU.
RX 7 Weight Reduction
#26621 from Darrel Stein · Not recommended · Minutes (2020-04 Fastrack)
Thank you for your letter. The CRB believes the car is classified correctly. The CRB will continue to monitor performance.
Request to clarify wicker height
#28224 from SCCA Staff · Recommended to the Board · Minutes (2020-03 Fastrack)
In ST, GCR section 9.1.4.D.4.d., add as follows: "Maximum allowable wicker height is 0.50 inches."
Request to allow polycarbonate for sunroof replacement
#28188 from Eric Heinrich · Not recommended · Minutes (2020-03 Fastrack)
Thank you for your letter. Sun roof replacement rules are adequate as written.
Request to Classify K20A
#27816 from Jacob Clark · No action required · Minutes (2020-03 Fastrack)
Thank you for your letter. The JDM and Euro K20s are STL legal with the use of the USDM intake manifold, 11.0:1 compression and 0.425 valve lift or the USDM OEM cam shaft. Aftermarket pistons are allowed in STL to achieve the 11.0:1 compression ratio.
Strut Car Weight Reduction (Existing Rule) Question
#27806 from Bill Lamkin · Not recommended · Minutes (2020-03 Fastrack)
Thank you for your letter. With the allowable STU suspension pick up point modifications, the CRB believes a front strut weight reduction is necessary. The CRB will continue to monitor performance.
PWC TCA MX5 2.0 weight revision
#27459 from Robert Tanon · Not recommended · Minutes (2020-03 Fastrack)
Thank you for your letter. PWC TC MX5 rule set is no longer available to the SCCA.
Request for RX8 Window Framework Removal
#27430 from Dale Shoemaker · Not recommended · Minutes (2020-03 Fastrack)
Thank you for your letter. Current window removal rules are adequately written.
Are all wheel drive vehicles allowed to run in any ST class?
#26962 from Jeremy Tanner · No action required · Minutes (2019-07 Fastrack)
Thank you for your letter. All Wheel Drive is permitted in Super Touring.
Right Hand Drive Integra
#26937 from Robert Paszkiewicz · No action required · Minutes (2019-07 Fastrack)
Thank you for your letter. Competitor may race JDM Integra as long as it meets this part of the ST Regulations; "Vehicles used in this category must be identifiable with the vehicles offered for sale to the public and available through the manufacturer’s distribution channels in the US."
Request to Clarify Manifold allowances
#26780 from Jose De Miguel · No action required · Minutes (2019-06 Fastrack)
Thank you for your letter. 9.1.4.G.1.e Is a general category rule and applies to both STL and STU. 9.1.4.1.B.3 is a STU specific rule applying only to STU and over riding 9.1.4.g.1.e.
FRS Weight
#28719 from Jonathan Gillean · No action required · Minutes (2019-05 Fastrack)
Thank you for your letter. Please see below BRZ calculation: 2.0L = 2700# X 1.5% for 12.5:1 compression ratio = 2740.5 pounds 2740.5 # X 5.5% rear wheel drive adder = 2891.
Request engine fairness
#26676 from Tim Auger · Taken care of · Minutes (2019-05 Fastrack)
Thank you for your letter. The Club Racing Board will continue to monitor class performance.
Addition of B18C1 GSR Motor to B Series Table
#26596 from Cliff Ira · Not recommended · Minutes (2019-04 Fastrack)
Thank you for your letter. Per Racing Memo 18-02, It was intended that you use a restrictor plate since 1/1/2018. The Club Racing Board will continue to monitor class performance.
Did You Really Mean To Add Flares to STL And STU?
#26561 from Harley Kaplan · No action required · Minutes (2019-04 Fastrack)
Thank you for your letter. Please see response to Letter #26564.
Request to be added to STAC
#26519 from Kevin Boehm · No action required · Minutes (2019-04 Fastrack)
Adding Kevin Boehm to the STAC
Request to clarify restrictor for the Honda/Acura B18B engine
#26329 from Jose De Miguel · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. Please see response to letter #26209. March 2019 Technical Bulletin.
Request B18C1 FPR: Followup to letter #26208
#26234 from Mike Taylor · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. Please see response to letter #26209. March 2019 Technical Bulletin.
Request Wing Rule Clarification
#26216 from Darren Murdock · Member advisory · Minutes (2019-03 Fastrack)
Thank you for your letter. In STL the wing in its entirety must be no higher than 6 inches below the highest point of the body or the main hoop of the roll cage. Whichever is higher.
Request B18C1 No Restrictor
#26166 from Eric Kutil · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. Please see letter #26209 for details. March 2019 Technical Bulletin.
Opposes Wing and Aero Rules
#25983 from Jose De Miguel · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. Your response has been logged.
Request to classify S2000 with K24 crank
#25798 from david mead · Not recommended · Minutes (2019-03 Fastrack)
Thank you for your letter. The Club Racing Board doesn’t support mixing and matching parts from different engine families.
Support for #25785
#25788 from Christopher DeShong · No action required · Minutes (2019-03 Fastrack)
Thank you for your letter. You are permitted to make necessary modifications to body work in order to mount an air dam.
Bumper Cover Clarification
#25785 from DAVID MEAD · No action required · Minutes (2019-03 Fastrack)
Thank you for your letter. The advisory committee feels the rule is clear as written.
Request modification of driver’s floor pan for taller drivers
#25779 from Rob Hines · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. The Miata already has allowances for floor modification in Super Touring.
Request for Clarification on 9.1.4.c.12
#25778 from Austin Hilliard · Not recommended · Minutes (2019-03 Fastrack)
Thank you for your letter. Please see 9.1.4 C. Bodywork 1. Unless otherwise allowed, standard body appearance must be strictly maintained.
Opposed to Changing Aero Rules
#25776 from Austin Hilliard · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. Your response has been logged.
Request to classify K24 in STL
#25766 from Kevin Koelemeyer · Not recommended · Minutes (2019-03 Fastrack)
Thank you for your letter. Maximum engine size in STL is 2000cc plus allowance for boring of block.
Supports Letter #25491
#25523 from Zach Grant · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. Please see the response to letter #25491.
Support of Letter 25491 and 22195
#25493 from Alan Cross · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. Please see the response to letter #25491.
Request RX-8 Spec Line Re: Factory Brake Rotor Size
#25491 from T.O. Johnson · Taken care of · Minutes (2019-03 Fastrack)
Thank you for your letter. The maximum brake rotor diameter in STL in 300mm.