GTL vs SM vs SMX vs P1 pace at Michelin Raceway Road Atlanta
Quickest here:GTL 1:36.868 Chris Bovis, Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta race · SM 1:42.324 Skyler Cottrell, Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta qualifying · SMX 1:24.667 Tyler Gonzales, Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta race · P1 1:18.122 Todd Vanacore, Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta qualifying
GTLSMSMXP1solid race · dashed qualifying · slower is lower
GTLSMSMXP1solid race · dashed qualifying · each class's best lap as a share of GTL's at the same event (the reference class, changeable above); 100% is level, higher is quicker
Event
GTL
SM
SMX
P1
Qual best
Race best
Trap
Qual best
Race best
Trap
vs GTL
% of GTL
Qual best
Race best
Trap
vs GTL
% of GTL
Qual best
Race best
Trap
vs GTL
% of GTL
Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta ST26MAR062026-03-06
1:42.324Skyler Cottrell · fastest of 52 · top 5 within 0.4s-0.524s (-0.51%)
1:42.611Charles Mactutus · fastest of 51 · top 5 within 0.2s-0.014s (-0.01%)
112.2James Newell+5.2 mph (+4.9%)
1:38.517Jarrett Jones · fastest of 20 · top 5 within 0.7s-0.145s (-0.15%)
1:24.667Tyler Gonzales · fastest of 21 · top 5 within 15.4s-14.098s (-14.27%)
120.7Elivan Goulart+3.7 mph (+3.2%)
8 rule changes (GTL: 1, SM: 3, SMX: 4)1 cars added · 7 wording · GT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height. · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine. · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine. · SM cars limited to one set of Hoosier SM 7.5 P205/50/ZR17 per Super Tour event weekend for dry sessions. · SMX Toyo RR P235/40/ZR17 tire rules clarified: one set per weekend, marking after first session, damage replacement procedures revised. · SMX data submission deadline extended from 30 to 60 minutes after each timed session.showhide
GTL Remove GT3U from GCR as it is now in STU #39862cars addedneutralGT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height.
SM SMX Data Submission - Penalties #38248wordingneutralSMX drivers must submit data acquisition files on time or face suspension and $250 fine.
SM Committee) SMX Penaly Clarification updated language #38337wordingneutralSMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine.
SMX SMX Data Submission - Penalties #38248wordingneutralSMX drivers must submit data acquisition files on time or face suspension and $250 fine.
SMX Committee) SMX Penaly Clarification updated language #38337wordingneutralSMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine.
SM Clarify Tire Marking Regs #38005wordingneutralSM cars limited to one set of Hoosier SM 7.5 P205/50/ZR17 per Super Tour event weekend for dry sessions.
SMX Clarify Tire Marking Regs #38004wordingneutralSMX Toyo RR P235/40/ZR17 tire rules clarified: one set per weekend, marking after first session, damage replacement procedures revised.
SMX SMX Data Submission Timeframe #38039wordingneutralSMX data submission deadline extended from 30 to 60 minutes after each timed session.
Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta ST25MAR072025-03-07
1:42.848Sean Noonan · fastest of 35 · top 5 within 0.2s+0.228s (+0.22%)
1:42.625Sean Noonan · fastest of 33 · top 5 within 0.6s-0.370s (-0.36%)
107.0Sean Noonan+1.8 mph (+1.7%)
1:38.662Camden Gruber · fastest of 30 · top 5 within 0.2s-0.302s (-0.31%)
1:38.765Skyler Cottrell · fastest of 30 · top 5 within 0.5s-1.159s (-1.16%)
117.0Cam Ebben+1.0 mph (+0.9%)
20 rule changes (GTL: 9, SM: 5, SMX: 5, P1: 1)3 cars added · 2 weight · 1 induction · 14 wording · TA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement. · SMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted. · SMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted. · GTL Toyota G16E-GTS removes direct injection ban wording, effective 11/1/2024. · GTL Nissan L16 limited prep gains alternate 32mm choke option at 1910 lbs minimum weight. · GTL adds Toyota GR86 2021-2023, 2dr RWD, 101.3 in wheelbase. · GTL adds Spec Miata 1990-2005 with legal Spec Miata engine and intake system. · Mazda MX5 RF 2017- added to GTL with 91.0 inch wheelbase. · SMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification. · SMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance. · SMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1. · SM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed. · SMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification. · SMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance. · SMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1. · SM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed. · GTL added to GT3 choke option line for induction control. · GT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR. · GTL Datsun 510 L16 Limited Prep allows 34 mm chokes, minimum weight rises to 2000 lbs. · P1 now encourages unspecified engines including Diesel, hybrid, or electric via case-by-case request to Club Racing Board.showhide
GTL Correct language regarding OEM Areo Devices #37137wordingneutralTA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement.
SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070wordingneutralSMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted.
SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070wordingneutralSMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted.
GTL G16E-GTS Fuel Injection Spec Line Change #36588wordingunclearGTL Toyota G16E-GTS removes direct injection ban wording, effective 11/1/2024.
GTL GTL Alternate Weight and Choke Option for L16 engine #36653inductionfasterGTL Nissan L16 limited prep gains alternate 32mm choke option at 1910 lbs minimum weight.
GTL Request to Include Toyota GR86 in GTL #36324cars addedneutralGTL adds Toyota GR86 2021-2023, 2dr RWD, 101.3 in wheelbase.
GTL Inclusion of Modified Spec Miata for GTL competition #36325cars addedneutralGTL adds Spec Miata 1990-2005 with legal Spec Miata engine and intake system.
GTL Include Mazda MX5 RF 2017- in GTL #36428cars addedneutralMazda MX5 RF 2017- added to GTL with 91.0 inch wheelbase.
SM SMX Camera Rule Correction #36496wordingneutralSMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification.
SM Committee) AIM ECU Protocol #36556wordingneutralSMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance.
SM Committee) OE versus OEM Definitons #36608wordingneutralSMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1.
SM Committee) Shifter Bushing #36611wordingneutralSM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed.
SMX SMX Camera Rule Correction #36496wordingneutralSMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification.
SMX Committee) AIM ECU Protocol #36556wordingneutralSMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance.
SMX Committee) OE versus OEM Definitons #36608wordingneutralSMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1.
SMX Committee) Shifter Bushing #36611wordingneutralSM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed.
GTL Add GTL to GT3 choke option line. #36236wordingunclearGTL added to GT3 choke option line for induction control.
GTL Request for Spec Line 1010 Reconsideration #35009weight +300 lbsslowerGT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR.
GTL Allow 34 mm chokes for the Datsun 510 #35661weight +50 lbsslowerGTL Datsun 510 L16 Limited Prep allows 34 mm chokes, minimum weight rises to 2000 lbs.
P1 Update GCR section 9.1.8.B.J.7 #35907wordingneutralP1 now encourages unspecified engines including Diesel, hybrid, or electric via case-by-case request to Club Racing Board.
Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta ST24MAR082024-03-08
1:38.327Chris Bovis · fastest of 5 · top 5 within 8.7s-10.718s (-9.83%)
1:36.868Chris Bovis · fastest of 5 · top 5 within 10.5s-12.160s (-11.15%)
118.0Peter Shadowen+14.0 mph (+13.4%)
1:42.620Danny Steyn · fastest of 47 · top 5 within 0.4s+0.001s (+0.00%)
1:42.995Charles Mactutus · fastest of 46 · top 5 within 0.1s+0.442s (+0.43%)
105.2Tyler Brown-6.9 mph (-6.2%)
+6.127squal +4.293s
106.3%qual 104.4%
1:38.964Michael Tinis · fastest of 33 · top 5 within 0.5s
1:39.924Will Robusto · fastest of 33 · top 5 within 1.1s
116.0Jack Murchison
+3.056squal +0.637s
103.2%qual 100.6%
1:19.119Todd Vanacore · fastest of 3 · top 3 within 18.1s+0.997s (+1.28%)
1:19.924John Mcaleer · fastest of 3 · top 3 within 17.8s-0.010s (-0.01%)
139.8John Mcaleer-12.4 mph (-8.2%)
-16.944squal -19.208s
82.5%qual 80.5%
20 rule changes (GTL: 11, P1: 9)3 cars added · 3 weight · 2 engine · 1 aero · 1 induction · 10 wording · P1 removes redundant effective date language from engine stalling prohibition during SIR testing. · P1 Honda K20A-FD2 engine terminology corrected from 'spec' to proper series designation. · GT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed. · GT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors. · GT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E. · GTL Mazda 12A rotary engines may machine and use 13B housing to O.E. 12A specifications. · GTL Toyota GR86 (DR86, 2021-2024, 2-door RWD, 101.3-inch wheelbase) newly classified. · GTL BMW Mini years corrected to 2002-2013. · F600 Rotax 494, 493, 593 engines now require single expansion chamber and pull starter; electric starter optional. · P1 4-cycle 2000cc restrictor increases to 32mm, weight rises to 1450 lbs; 2300cc restrictor to 31mm, weight to 1475 lbs. · P1 Group CN Honda K20A-FD2 removes engine modification restrictions; CRB may add intake restrictor. · GTL small unrestricted engines under 1399cc lose 40-50 lbs across Alfa, AMC, Triumph, Mini, Sprite, Fiat, Ford, Honda, Mazda, Nissan, Subaru, Toyota, Volkswagen. · GTL Honda Fit 2009-13 2-door FWD classified with wheelbase options 94.0, 97.0, or 99.0 inches. · GTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL. · GTL Nissan Sentra/200SX A14 engine weight reduced from 1850 lbs to 1800 lbs. · P1 SIR testing procedure modified: vehicle deemed compliant if stalls within 3 seconds. · P1 Single Inlet Restrictor wording clarified; all intake air or fuel-air mixture must pass through it. · P1 ducted air rule clarified: cockpit opening, fender louvers, and engine bay heat escape devices exempt from heat exchanger requirement. · Fields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight. · P1 cockpit length dimension corrected from 23.662 to 23.622 inches; height and extension limits clarified with metric-imperial equivalents.showhide
P1 Remove redundant effective date language in GCR 9.1.8.B.J.4 #35693wordingneutralP1 removes redundant effective date language from engine stalling prohibition during SIR testing.
P1 Correct engine series terminology #35694wordingneutralP1 Honda K20A-FD2 engine terminology corrected from 'spec' to proper series designation.
GTL Rear Blade Spoiler Clarification #35261aerofasterGT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed.
GTL GT Direct Injection allowance and rules #35437enginefasterGT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors.
GTL GT2/3 remove Direction Injection not allowed in Spec line notes #35439inductionfasterGT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E.
GTL Rotary Engine 12A Rotor Housings #35131wordingneutralGTL Mazda 12A rotary engines may machine and use 13B housing to O.E. 12A specifications.
GTL Request to Include Toyota GR86 in GTL #35198cars addedneutralGTL Toyota GR86 (DR86, 2021-2024, 2-door RWD, 101.3-inch wheelbase) newly classified.
GTL Errors and Omissions, GTL engines & Cars #35226wordingneutralGTL BMW Mini years corrected to 2002-2013.
P1 Please correct omitted punctuation #34890engineneutralF600 Rotax 494, 493, 593 engines now require single expansion chamber and pull starter; electric starter optional.
P1 Adjust restrictors and weights for Engine Table lines H and I #35229weightslowerP1 4-cycle 2000cc restrictor increases to 32mm, weight rises to 1450 lbs; 2300cc restrictor to 31mm, weight to 1475 lbs.
P1 Revise Group CN Honda K20A-FD2 Spec Line #35337wordingunclearP1 Group CN Honda K20A-FD2 removes engine modification restrictions; CRB may add intake restrictor.
GTL Small Engines in GT Lite #34842weightfasterGTL small unrestricted engines under 1399cc lose 40-50 lbs across Alfa, AMC, Triumph, Mini, Sprite, Fiat, Ford, Honda, Mazda, Nissan, Subaru, Toyota, Volkswagen.
GTL Request to Classify Honda Fit body in GTL #35020cars addedneutralGTL Honda Fit 2009-13 2-door FWD classified with wheelbase options 94.0, 97.0, or 99.0 inches.
GTL Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453wordingneutralGTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL.
GTL Weight for Nissan Sentra/200SX A 1400's #34918weight -50 lbsfasterGTL Nissan Sentra/200SX A14 engine weight reduced from 1850 lbs to 1800 lbs.
P1 SIR Testing #34354wordingneutralP1 SIR testing procedure modified: vehicle deemed compliant if stalls within 3 seconds.
P1 E&O Single Inlet Restrictor abbreviation, etc. #34369wordingneutralP1 Single Inlet Restrictor wording clarified; all intake air or fuel-air mixture must pass through it.
P1 E&O Clean up ducted air provision #34410wordingneutralP1 ducted air rule clarified: cockpit opening, fender louvers, and engine bay heat escape devices exempt from heat exchanger requirement.
GTL Please classify Fields Cardinal V8 #33784cars addedneutralFields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.
P1 E&O - Correct dimensional equivalents #34018wordingneutralP1 cockpit length dimension corrected from 23.662 to 23.622 inches; height and extension limits clarified with metric-imperial equivalents.
Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta ST23MAR102023-03-10
1:49.045David Blain · only car
1:49.028David Blain · only car
104.0David Blain
1:42.619Charles Mactutus · fastest of 48 · top 5 within 0.7s
1:42.553Charles Mactutus · fastest of 47 · top 5 within 0.4s
112.2Jonathan Neudorf
-6.475squal -6.426s
94.1%qual 94.1%
1:18.122Todd Vanacore · fastest of 5 · top 5 within 13.9s
1:19.934Jean-Luc Liverato · fastest of 3 · top 3 within 1.0s
152.2Jean-Luc Liverato
-29.094squal -30.923s
73.3%qual 71.6%
91 earlier rule changes on record, in force before Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta (from 2019)16 cars added · 7 aero · 7 induction · 6 engine · 5 weight · 3 removed · 1 suspension & brakes · 46 wording · P1 suspension covers must have symmetrical upper and lower surfaces, no airfoil shaping, cannot angle for downforce. · GTL Toyota 3K, 4K, 5K engines now permitted to use 4Y block only. · GT2 Toyota 4A-F and 4A-FE 1.6L DOHC 16V engines newly classified in spec line. · SM Mazda MX-5 Miata 01-05 weight increases to 2450 lbs, or 2465 with alternate bore. · GTL Fiat 1500 Limited Prep X1/9 weight increases to 2000 lbs. · GT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870. · Ford Festiva 1988-1993 added to GTL with Mazda B3 1324cc engine. · GTL Toyota G16E-GTS 3-cylinder engine added: 1618cc, 1945 lbs, naturally aspirated with SIR fuel induction. · P1 aerodynamic devices limited to 1cm below lower surfaces rear of front axle; body panels covering suspension cannot be airfoil-shaped. · P1 forced induction banned: turbocharging and supercharging no longer allowed. · GT taillights may now be original style or a panel graphic with functioning red LED brake lamps; wording change only. · P1 motorcycle-based engines with individual throttle bodies must install flat plate restrictors within 4 inches of primary butterfly. · P1 bodywork rules clarified: cycle fenders prohibited, side body minimum height at front axle centerline required, air ducting for downforce banned. · SM Majors must run authorized Penske shock and mount; Regional competitors' requirement eligibility clarified. · Ginetta G40 classified in GTL with Ford Zetec 1796cc engine at 2050 lbs, plus 51 lbs for IRS or 26 lbs for sequential. · P1 2-cycle 6-cylinder displacement increases to 1725 cc, restrictor shrinks to 40mm, minimum weight drops to 1275 lbs. · GT3 Fun Cup Beetle EVO3 classified with 1984 cc sealed SOHC engine, 2060 lbs minimum weight. · P1 splits 2000cc and 2300cc engines into separate spec lines H and I with dedicated minimum weights. · P1 Staudacher cars with 38.5mm flat plate intake restrictor reduced to 950 lbs minimum weight. · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix. · P1 adds 1355cc motorcycle-based engine spec line with no restrictor required, minimum weight 1075 lbs. · GTL Honda B18a,b vs B18c: new split classifies B18a,b at 2050 lbs, B18c at 2065 lbs. · GTL Nissan B13 Sentra allowed hood bulge maximum 1.5 inches high, 10.0 inches long, 6.0 inches wide. · GTL BMW E21 added to GT Cars - BMW classification. · P1 tonneau cover wording clarified: equipment must be securely attached; covers allowed for minimum dimensions. · P1 Staudacher with 1005cc homologated before 1-1-2014 may run 38.5mm flat plate intake restrictor at 950 lbs minimum weight. · P1 Spec Lines C and G: intake restrictor rules clarified with specific displacement and weight thresholds; wording standardized. · P1 Spec Lines B, C, D maximum valves per cylinder set to 4, was NA. · P1 Spec Line A clarifies carburetor induction only, one per cylinder, balance tubes not allowed. · P1 Spec Line H notes clarify peripheral port or bridgeport allowed. · SM adds procedures for testing obsolete part replacements and BOP updates in sanctioned events with CRB approval. · GTL Mazda 12A SIR increases to 29mm, minimum weight rises to 2000 lbs. · P1 Elan DP02 Mazda MZR sealed engine option removal effective 3/1/2021. · P1 engine table updates terminology from inlet to intake restrictor across multiple spec lines. · Fiat X-1/9 Bertone 1500 added to GTL with 2000 lbs minimum weight, SOHC, fuel induction options, Level 2 prep. · GTL Nissan MRA8DE 1797cc engine classified with 2050 lbs minimum weight and 22.5mm restrictor. · GTL Mazda 13B SIR increases from 26mm to 28mm; 27mm plus 175 lbs option removed. · SM aftermarket radiators must mount in original location, maintain core plane, require no body modifications, block openings, keep one OEM fan in stock location; 1990-1997 cars may install upper radiator seal NA75-50-OK7A. · GT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. · GTL Mazda 13B restrictor increases to 26mm SIR, minimum weight rises to 2125 lbs. · SM rear brake calipers may use single bracket under upper retaining bolt to prevent pin failure. · GTL Toyota MR2 Spyder 1999-2007 newly classified. · TA2 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. · STO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules. · GT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged. · GTL Mazda 13B restrictor size clarification issued; refer to letter 28518 for details. · GTL stall test procedure clarified: intake system must pass SIR test as raced, no air bypass allowed. · GTL wing mount openings excluded from square inch limit. · P1 intake manifolds unrestricted on engines without flat plate restrictor; plenums and balance pipes prohibited on individual runner manifolds with restrictor. · GTL wing mounting posts limited to 85 square inches exposed area each, measured flat from side view. · GTL wing mounting posts limited to 85 square inches exposed area each, measured flat from side. · GTL wing endplates change from 8.5×3.0 inch rectangle to maximum 64 square inches. · GTL Mazda 12A Street Port minimum weight reduced to 1950 lbs from 2000 lbs. · GT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. · P1 sealed DP02-spec 2.0L Mazda MZR Elan removal date extended from 1/1/2020 to 1/1/2021. · Factory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs. · GTL adds Jetta Mk1 two door classification effective 2020-01-01. · P1 sealed DP02-spec 2.0 MZR engine removed effective 1/1/2020; competitors may use Spec Line G. · P1 Spec Line F Honda K20A-FD2 reclassified from Restricted 2.0L Group to CN-spec with stock intake manifold and 64mm throttle body. · GTL Honda CRX 84-87 and 88-91 remove IRS option with 2.5% weight penalty. · GTL Fun Cup Beetle engine weight specified at 1850 lbs with sealed SOHC 1780cc specification. · GTL Fun Cup Beetle removes reference to VW engine table; Fun Cup engine spec remains 1.8L at 2040 lbs. · P1 traction control prohibited in GCR section 9.1.8.C.H. · GTL Honda CRZ 10-14, CRZ 15-16, and Insight 00-06 gain alternate wheelbase option of 90.6 in. · P1 allows mechanical and solenoid shifters, prohibits electronic controls and pre-selected changes. · P1 bodywork minimum height provision moved to aerodynamic section; 115cm height limit for aero parts added. · P1 clarifies fender louver and brake duct rules, consolidating duplicative provisions in GCR 9.1.8.C. · P1 anti-intrusion panels now allowed anywhere on chassis sides, previously restricted. · P1 bodywork wording corrected: 'a passenger' becomes 'passenger' in three GCR sections. · GTL adds VW Fun Cup Beetle, all model years, 2-door RWD, 94.5-inch wheelbase. · GTX tube frame cars gain fuel injection with 90mm maximum throttle body size. · Ligier JS2 R classified in GTX, no performance parameters specified in filing. · GTL Mazda 13B may use 25mm SIR with 175 lbs weight penalty added. · P1 Engine Table reference cleaned up; no performance change. · P1 Mazda Renesis Rotary removed from Engine Table specification line. · GT1 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. · P1 Staudacher and Honda K20A-FD2 engine table language cleaned up; no performance changes. · GTL Mazda 12A may use 28mm SIR plus 175 lbs. · GTL Mustang 94-04 newly classified in GTL. · P1 closed cockpit single-seat cars moved from subsection J.5 to subsection B.4; prohibition unchanged. · SM fuel pump and filter must be Mazda or OEM Equivalent part. · P1 engine table reference corrected from 'above' to 'below'; ECU throttle wording clarified for dual sensors and fail-safes. · SM 1999-2000 model year cars may use replacement Mazda ECU and injector harnesses, unmodified. · SM electrical rules reorganized and clarified; alternator external regulation now prohibited except via OEM ECU/kill switch. · SM removes tire tread protrusion beyond fender opening requirement from GCR 9.1.7.C.5. · GTL Mini 1275-1399 Iron and Aluminum Crossflow gain 75 lbs weight reduction to 125 lbs with OE common sump gearbox. · GTL BMC thru Rover Group removes long inactive Mini engines: 948, 970, 1071, 1098. · GTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified. · P1 removes redundant TIR inlet restrictor provisions; SIR and flat plate restrictors remain required. · P1 Honda K20A-FD2 CN-spec clarifies allowed parts to OEM list only, no machining. · P1 engine table wording corrected; head designs removed from listed specifications.showhide
P1 November 2022 Rules Clarification for Suspension Covers #33615aeroslowerP1 suspension covers must have symmetrical upper and lower surfaces, no airfoil shaping, cannot angle for downforce.
GTL Toyota 4Y Engine Classification Request #33562engineneutralGTL Toyota 3K, 4K, 5K engines now permitted to use 4Y block only.
GTL Toyota 4A-F and 4A-FE 1.6L DOHC 16V Engine Request #33415cars addedneutralGT2 Toyota 4A-F and 4A-FE 1.6L DOHC 16V engines newly classified in spec line.
SM BOP for NB1 and NB2 #32309weightslowerSM Mazda MX-5 Miata 01-05 weight increases to 2450 lbs, or 2465 with alternate bore.
GTL Fiat HP Limited Prep X1/9 Weight in GTL #33297weightslowerGTL Fiat 1500 Limited Prep X1/9 weight increases to 2000 lbs.
GTL GT2 (TA2)/GTA Part Number Update #33315wordingneutralGT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870.
GTL Request to add Ford Festiva to GTL #33335cars addedneutralFord Festiva 1988-1993 added to GTL with Mazda B3 1324cc engine.
GTL Engine Request #33064cars addedneutralGTL Toyota G16E-GTS 3-cylinder engine added: 1618cc, 1945 lbs, naturally aspirated with SIR fuel induction.
P1 Clarify body panel coverage of suspension components #33318aeroslowerP1 aerodynamic devices limited to 1cm below lower surfaces rear of front axle; body panels covering suspension cannot be airfoil-shaped.
P1 E&O clarification regarding forced induction #33123inductionslowerP1 forced induction banned: turbocharging and supercharging no longer allowed.
GTL Tail lights on all GT category race cars. #32799wordingneutralGT taillights may now be original style or a panel graphic with functioning red LED brake lamps; wording change only.
P1 Clarify authorization to use flat plate intake restrictor #32964wordingneutralP1 motorcycle-based engines with individual throttle bodies must install flat plate restrictors within 4 inches of primary butterfly.
P1 E&O Clarification of Bodywork Rules #32468wordingneutralP1 bodywork rules clarified: cycle fenders prohibited, side body minimum height at front axle centerline required, air ducting for downforce banned.
SM Update GCR Section 9.1.7.3.A.1. #32217wordingneutralSM Majors must run authorized Penske shock and mount; Regional competitors' requirement eligibility clarified.
GTL Request to Classify Ginetta G40 in GTL #31599cars addedneutralGinetta G40 classified in GTL with Ford Zetec 1796cc engine at 2050 lbs, plus 51 lbs for IRS or 26 lbs for sequential.
P1 Displacement & Weight Change Request for 2-Cycle 6 Cylinder #31609enginefasterP1 2-cycle 6-cylinder displacement increases to 1725 cc, restrictor shrinks to 40mm, minimum weight drops to 1275 lbs.
GTL Request car classification #31032cars addedneutralGT3 Fun Cup Beetle EVO3 classified with 1984 cc sealed SOHC engine, 2060 lbs minimum weight.
P1 Move 2000cc and 2300cc engine options to individual spec lines #31012wordingneutralP1 splits 2000cc and 2300cc engines into separate spec lines H and I with dedicated minimum weights.
P1 E&O Spec Line B notes #31095weightfasterP1 Staudacher cars with 38.5mm flat plate intake restrictor reduced to 950 lbs minimum weight.
GTL Request to Update GTA Obsolete Part Numbers #30615wordingneutralGTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix.
P1 Add 1355cc spec line #30890cars addedneutralP1 adds 1355cc motorcycle-based engine spec line with no restrictor required, minimum weight 1075 lbs.
GTL Request clarification for the Honda B18a,bVS B18c #30482wordingneutralGTL Honda B18a,b vs B18c: new split classifies B18a,b at 2050 lbs, B18c at 2065 lbs.
GTL Request to Allow Hood Bulge on Nissan B13 Sentra #30504aeroneutralGTL Nissan B13 Sentra allowed hood bulge maximum 1.5 inches high, 10.0 inches long, 6.0 inches wide.
GTL Request BMW E21 Classing #30582cars addedneutralGTL BMW E21 added to GT Cars - BMW classification.
P1 E&O tonneau cover provision in cockpit opening section #30458wordingneutralP1 tonneau cover wording clarified: equipment must be securely attached; covers allowed for minimum dimensions.
P1 Update Spec Line B Notes #30498wordingneutralP1 Staudacher with 1005cc homologated before 1-1-2014 may run 38.5mm flat plate intake restrictor at 950 lbs minimum weight.
P1 Update Spec Lines C and G notes #30499wordingneutralP1 Spec Lines C and G: intake restrictor rules clarified with specific displacement and weight thresholds; wording standardized.
P1 E&O Maximum Valves Per Cylinder #30559engineunclearP1 Spec Lines B, C, D maximum valves per cylinder set to 4, was NA.
P1 Clean up Spec Line A notes section #30424wordingneutralP1 Spec Line A clarifies carburetor induction only, one per cylinder, balance tubes not allowed.
P1 Clean up Spec Line H notes section #30425wordingneutralP1 Spec Line H notes clarify peripheral port or bridgeport allowed.
SM Updates - Obsolete Parts & BOP Parts #30438wordingneutralSM adds procedures for testing obsolete part replacements and BOP updates in sanctioned events with CRB approval.
GTL Request for Help for Mazda 12A #29754induction +50 lbsslowerGTL Mazda 12A SIR increases to 29mm, minimum weight rises to 2000 lbs.
GTL Increase 13b SIR size #29867inductionfasterGTL Mazda 13B SIR increases from 26mm to 28mm; 27mm plus 175 lbs option removed.
SM Radiator E&O Clarifications #29294wordingneutralSM aftermarket radiators must mount in original location, maintain core plane, require no body modifications, block openings, keep one OEM fan in stock location; 1990-1997 cars may install upper radiator seal NA75-50-OK7A.
GTL GT Category Wording #29193wordingunclearGT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line.
GTL Request to change the Mazda 13b restrictor size #28518induction +175 lbsfasterGTL Mazda 13B restrictor increases to 26mm SIR, minimum weight rises to 2125 lbs.
SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakesneutralSM rear brake calipers may use single bracket under upper retaining bolt to prevent pin failure.
GTL Request to classify 1999-2007 Toyota MR2 Spyder body #28870cars addedneutralGTL Toyota MR2 Spyder 1999-2007 newly classified.
GTL TA2 Gurney flap wicker clarification #28874wordingneutralTA2 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.
GTL STO Gurney flap wicker clarification #28883wordingneutralSTO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules.
GTL Mazda 13b Restrictor Size Follow up to Letter 28518 #29015wordingunclearGTL Mazda 13B restrictor size clarification issued; refer to letter 28518 for details.
GTL Stall Test #28709wordingneutralGTL stall test procedure clarified: intake system must pass SIR test as raced, no air bypass allowed.
GTL GTL Wing Rule #28754aeroneutralGTL wing mount openings excluded from square inch limit.
P1 E&O minimum weights and intake manifolds #28731inductionfasterP1 intake manifolds unrestricted on engines without flat plate restrictor; plenums and balance pipes prohibited on individual runner manifolds with restrictor.
GTL Wing Mounting Upright Size #27641aeroneutralGTL wing mounting posts limited to 85 square inches exposed area each, measured flat from side view.
GTL Wing Mounting Upright Size #27641aeroneutralGTL wing mounting posts limited to 85 square inches exposed area each, measured flat from side.
GTL GTL wing end plates addition #28243aerofasterGTL wing endplates change from 8.5×3.0 inch rectangle to maximum 64 square inches.
GTL Clarification to letter #27406 #28309weight -50 lbsfasterGTL Mazda 12A Street Port minimum weight reduced to 1950 lbs from 2000 lbs.
GTL Windshield Clips #27323wordingneutralGT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications.
P1 Extend date for removing sealed DP02-spec 2.0L option #28046wordingneutralP1 sealed DP02-spec 2.0L Mazda MZR Elan removal date extended from 1/1/2020 to 1/1/2021.
GTL Request Factory Five Daytona coupe classification #26308cars addedneutralFactory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs.
GTL Request to Classify the MK1 two door Jetta #27648cars addedneutralGTL adds Jetta Mk1 two door classification effective 2020-01-01.
P1 Remove sealed DP02-spec 2.0 MZR spec #26753removedslowerP1 sealed DP02-spec 2.0 MZR engine removed effective 1/1/2020; competitors may use Spec Line G.
P1 Update Revised Spec Line F #27745engineunclearP1 Spec Line F Honda K20A-FD2 reclassified from Restricted 2.0L Group to CN-spec with stock intake manifold and 64mm throttle body.
GTL 88-91 Honda CRX Spec Line Correction #27233wordingneutralGTL Honda CRX 84-87 and 88-91 remove IRS option with 2.5% weight penalty.
GTL Fun Cup Beetle #27334wordingneutralGTL Fun Cup Beetle engine weight specified at 1850 lbs with sealed SOHC 1780cc specification.
GTL GTL #26960wordingneutralGTL Fun Cup Beetle removes reference to VW engine table; Fun Cup engine spec remains 1.8L at 2040 lbs.
P1 E&O Transmissions #27098wordingunclearP1 traction control prohibited in GCR section 9.1.8.C.H.
GTL Request CRZ wheelbase change #26896wordingunclearGTL Honda CRZ 10-14, CRZ 15-16, and Insight 00-06 gain alternate wheelbase option of 90.6 in.
P1 E&O Transmissions #27005wordingneutralP1 allows mechanical and solenoid shifters, prohibits electronic controls and pre-selected changes.
P1 Move minimum height provision to #27031wordingneutralP1 bodywork minimum height provision moved to aerodynamic section; 115cm height limit for aero parts added.
P1 Remove duplicative fender louver provision #27033wordingneutralP1 clarifies fender louver and brake duct rules, consolidating duplicative provisions in GCR 9.1.8.C.
P1 Missing word E&O #26919wordingneutralP1 anti-intrusion panels now allowed anywhere on chassis sides, previously restricted.
P1 E&O correction to GCR 9.1.8.C.C. #26927wordingneutralP1 bodywork wording corrected: 'a passenger' becomes 'passenger' in three GCR sections.
GTL Request to Classify VW Fun Cup Beetle #25986cars addedneutralGTL adds VW Fun Cup Beetle, all model years, 2-door RWD, 94.5-inch wheelbase.
GTL Request GTX Fuel injection for previous GT-1 tube frame cars #26141inductionfasterGTX tube frame cars gain fuel injection with 90mm maximum throttle body size.
GTL Request to Classify Ligier JS2 R #26535cars addedneutralLigier JS2 R classified in GTX, no performance parameters specified in filing.
GTL Request for GTL Mazda 13B SIR Increase with Penalty #26572engineslowerGTL Mazda 13B may use 25mm SIR with 175 lbs weight penalty added.
P1 Clean up reference to engine table #26648wordingneutralP1 Engine Table reference cleaned up; no performance change.
P1 Remove redundant spec line #26692removedneutralP1 Mazda Renesis Rotary removed from Engine Table specification line.
GTL Request Ride Height Clarification #26600wordingneutralGT1 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.
P1 Clean Up Engine Table Language #26590wordingneutralP1 Staudacher and Honda K20A-FD2 engine table language cleaned up; no performance changes.
GTL Request Mazda 12a Rotary SIR Increase #26081inductionfasterGTL Mazda 12A may use 28mm SIR plus 175 lbs.
GTL Request to Classify Mustang 2 Body in GTL #26222cars addedneutralGTL Mustang 94-04 newly classified in GTL.
P1 Move single-seat closed cockpit provision to #26376wordingneutralP1 closed cockpit single-seat cars moved from subsection J.5 to subsection B.4; prohibition unchanged.
SM Request to allow aftermarket fuel filters. #26370wordingneutralSM fuel pump and filter must be Mazda or OEM Equivalent part.
P1 Correct errors in GCR section 9.1.8.C.J #26144wordingneutralP1 engine table reference corrected from 'above' to 'below'; ECU throttle wording clarified for dual sensors and fail-safes.
SM Request 99-00 replacement Wire harnesses #25602wordingneutralSM 1999-2000 model year cars may use replacement Mazda ECU and injector harnesses, unmodified.
SM Organize and Clarify 9.1.7.C.1.o. #25913wordingneutralSM electrical rules reorganized and clarified; alternator external regulation now prohibited except via OEM ECU/kill switch.
SM Strike Tire Tread Language #26123wordingneutralSM removes tire tread protrusion beyond fender opening requirement from GCR 9.1.7.C.5.
GTL Request for GTL Mini Adjustments #25754weightfasterGTL Mini 1275-1399 Iron and Aluminum Crossflow gain 75 lbs weight reduction to 125 lbs with OE common sump gearbox.
GTL BMC thru Rover Group remove long inactive mini #25771removedneutralGTL BMC thru Rover Group removes long inactive Mini engines: 948, 970, 1071, 1098.
GTL GTX Homologation table update #26034cars addedneutralGTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.
P1 Remove redundant inlet restrictor provisions #25877wordingneutralP1 removes redundant TIR inlet restrictor provisions; SIR and flat plate restrictors remain required.
P1 Clarify Honda K20A-FD2 parts requirement #25949wordingneutralP1 Honda K20A-FD2 CN-spec clarifies allowed parts to OEM list only, no machining.
P1 Correct GCR section 9.1.8.C.J errors #25966wordingneutralP1 engine table wording corrected; head designs removed from listed specifications.
Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it, how many cars set a time that session and how close the top five were; a best from fewer than three cars is greyed. With two or more classes, "vs" is the gap of each class's best to the first class's at the same event. "% of GTL" is the class's best as a share of GTL's best at the same event (100% is level, less is quicker): weather and track condition move every class together, so this compares across years where the raw times do not. It still breaks when GTL's own field changes or one session was wet and another dry. Newest event first. The coloured figure under each value is the change from the previous event that has one (green is quicker, red slower). Whole laps only, so events with different sector layouts still compare. Weather and track condition are not accounted for.