Quickest here:GT3 1:52.853 Michael Lewis, Cal Club 2024 qualifying · P1 1:33.133 Chip Romer, Cal Club 2024 qualifying
GT3P1solid race · dashed qualifying · slower is lower
GT3P1solid race · dashed qualifying · each class's best lap as a share of GT3's at the same event (the reference class, changeable above); 100% is level, higher is quicker
Event
GT3
P1
Qual best
Race best
Trap
Qual best
Race best
Trap
vs GT3
% of GT3
Cal Club 2024 CALCL242024-02-23
1:52.853Michael Lewis · fastest of 5 · top 5 within 12.0s
1:52.971Michael Lewis · fastest of 4 · top 4 within 5.0s
119.8Michael Lewis
1:33.133Chip Romer · fastest of 7 · top 5 within 5.2s
1:34.989Chip Romer · fastest of 7 · top 5 within 4.0s
138.2Aaron Bailey
-17.982squal -19.720s
84.1%qual 82.5%
25 rule changes (GT3: 17, P1: 8)4 cars added · 4 engine · 4 weight · 2 aero · 2 induction · 2 tyres & wheels · 7 wording · 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. · GT3 Toyota FA24D engine classified: 2387cc DOHC, 2195 lbs, 32mm SIR, direct injection permitted. · GT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E. · GT3 Nissan QR25DE/DD spec line edit; text unreadable due to formatting corruption. · GT3 Mazda RX7 12A, 13B Bridgeport, 13B Peripheral Port: disenfranchised GT2 adds 75 lbs. · GT3 Mazda BP4W turbocharged OEM engine weight reduced from 2060 to 1960 lbs. · GT3 Mazda 13B peripheral port weight reduced to 2100 lbs. · GT3 adds Toyota GR 86 (DR86) 2021–2024, 2-door RWD, 101.3 in wheelbase. · GT3 Toyota 3S bore increases to 86.0mm, stroke decreases to 86.0mm. · 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. · GT3 Toyota 3S DOHC engine classified at 1998 cc, 1960 lbs minimum weight, unrestricted fuel induction. · GT3 2.0L SIR cars lose 32mm unrestricted option, now require restrictor at 2195lbs minimum. · GTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL. · GT3-TCR Audi RS3 LMS, Honda Civic Type R, Hyundai i30 N, VW Golf GTi must use 200 tread wear tires only. · GT3 Honda B20 engine newly classified for use in CRX, 1973cc displacement, aluminum head, DOHC. · GT3 cars using 15" American Racer 23.5-10.0-15 bias ply tires avoid weight penalty. · 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. · P1 suspension covers must have symmetrical upper and lower surfaces, no airfoil shaping, cannot angle for downforce.showhide
GT3 Rear Blade Spoiler Clarification #35261aerofasterGT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed.
GT3 GT Direct Injection allowance and rules #35437enginefasterGT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors.
GT3 Request to Include Toyota FA24D Engine for use in GT3 #35199cars addedcars addedGT3 Toyota FA24D engine classified: 2387cc DOHC, 2195 lbs, 32mm SIR, direct injection permitted.
GT3 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.
GT3 Edit GT3 Nissan QR25DE/DD spec line #35442wordingunclearGT3 Nissan QR25DE/DD spec line edit; text unreadable due to formatting corruption.
GT3 Turbo Help #35042weight -100 lbsfasterGT3 Mazda BP4W turbocharged OEM engine weight reduced from 2060 to 1960 lbs.
GT3 Competition Adjustment Request for 13B Peripheral Port #35100weight -100 lbsfasterGT3 Mazda 13B peripheral port weight reduced to 2100 lbs.
GT3 Request to Include Toyota GR 86 in GT3 #35197cars addedcars addedGT3 adds Toyota GR 86 (DR86) 2021–2024, 2-door RWD, 101.3 in wheelbase.
GT3 Fastrack Toyota 3S Correction #35258engineunclearGT3 Toyota 3S bore increases to 86.0mm, stroke decreases to 86.0mm.
P1 Please correct omitted punctuation #34890engineengineF600 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.
GT3 Toyota Engine Classification Request #35019engineengineGT3 Toyota 3S DOHC engine classified at 1998 cc, 1960 lbs minimum weight, unrestricted fuel induction.
GT3 GT3 2.0L SIR & weight #35171inductionslowerGT3 2.0L SIR cars lose 32mm unrestricted option, now require restrictor at 2195lbs minimum.
GT3 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453wordingwordingGTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL.
GT3 GT3 TCR 200 TW tires #34993tyres & wheelsslowerGT3-TCR Audi RS3 LMS, Honda Civic Type R, Hyundai i30 N, VW Golf GTi must use 200 tread wear tires only.
GT3 Classify Honda B20 engine in GT3 CRX #34781cars addedcars addedGT3 Honda B20 engine newly classified for use in CRX, 1973cc displacement, aluminum head, DOHC.
GT3 Addendum to letter 33913, GT3 DOT tires. #34627tyres & wheelsfasterGT3 cars using 15" American Racer 23.5-10.0-15 bias ply tires avoid weight penalty.
P1 SIR Testing #34354wordingwordingP1 SIR testing procedure modified: vehicle deemed compliant if stalls within 3 seconds.
P1 E&O Single Inlet Restrictor abbreviation, etc. #34369wordingwordingP1 Single Inlet Restrictor wording clarified; all intake air or fuel-air mixture must pass through it.
P1 E&O Clean up ducted air provision #34410wordingwordingP1 ducted air rule clarified: cockpit opening, fender louvers, and engine bay heat escape devices exempt from heat exchanger requirement.
GT3 Please classify Fields Cardinal V8 #33784cars addedcars addedFields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.
P1 E&O - Correct dimensional equivalents #34018wordingwordingP1 cockpit length dimension corrected from 23.662 to 23.622 inches; height and extension limits clarified with metric-imperial equivalents.
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.
Cal Club 2023 CALCL232023-02-24
90 earlier rule changes on record, in force before Cal Club 2023 (from 2019)22 cars added · 14 induction · 9 engine · 3 removed · 3 weight · 2 aero · 1 tyres & wheels · 36 wording · GT3 Nissan VG30 engine removed from class entirely. · GT3 normally aspirated cars may use intake chokes instead of SIRs, fitted to each carburetor barrel, same size as required SIR. · GT3 2.0L 4-valve non-turbo engines may run unrestricted at 2060 lbs instead of with a choke restriction. · GT3 Mazda BP4W Turbocharged OEM engine added at 2060 lbs with 34mm TIR and IHI RHF5 VJ35 turbocharger. · GT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870. · GT3 Nissan SR20VET turbo changes to GT2860RS and allows open ECU instead of OEM stock. · GT3 adds 84-87 Civic 3dr FWD, hood bulge allowed, no openings. · P1 aerodynamic devices limited to 1cm below lower surfaces rear of front axle; body panels covering suspension cannot be airfoil-shaped. · GT3 Turbo maximum displacement increases from 1800 cc to 1850 cc. · 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. · GT3 Nissan SR20VET Limited Prep-Turbocharged OEM engine classified, 1998cc DOHC with Garrett GT2560LS turbo, 2060 lbs. · P1 motorcycle-based engines with individual throttle bodies must install flat plate restrictors within 4 inches of primary butterfly. · GT3 Fiat 124 Spider model name corrected from Pininfarina to Pininfarina Spider. · GT3 Fiat 124 Spider Pininfarina reclassified by model year, body style, drivetrain, and wheelbase. · GT3 cars can use up to 18" wheels with 12.0" tire cross section and 26.0" diameter at 5% weight penalty, down from 8%. · P1 bodywork rules clarified: cycle fenders prohibited, side body minimum height at front axle centerline required, air ducting for downforce banned. · GT3-TCR: Audi RS3 LMS SEQ power to 90%, weight to 3177 lbs; RS3 LMS DSG power to 90%; Honda Civic Type R power to 90%, weight to 3210 lbs; Hyundai i30N power to 90%, weight to 3254 lbs; VW Golf GTI SEQ power to 90%, weight to 3177 lbs; Gol… · GT3 Ginetta G40 classified with Mazda MZR 1999cc at 2060 lbs or Ford Duratec 2260cc at 2195 lbs. · GT3 Mazda MZR DOHC 1999cc classified with 2195 lbs minimum weight, unrestricted fuel induction. · Volvo S60 2000-2009 classified in GT3. · GT3 2.0L 4V engines now unrestricted at 2195 lbs minimum weight across all makes. · GT3 wing wording corrected: single element airfoil scaled changed to up to maximum chord 10.75 inches. · GT3 adds Fiat Spider 2000, Years 79-81, RWD, 89.76" wheelbase. · GT3 adds Fiat X-19, years 72-89. · P1 2-cycle 6-cylinder displacement increases to 1725 cc, restrictor shrinks to 40mm, minimum weight drops to 1275 lbs. · GT3 Fun Cup Beetle Sealed weight reduced 210 lbs, to 1850. · GT3-TCR class added: Audi RS3 LMS, Honda Civic Type R, Hyundai i30N, VW Golf GTI at 3100–3200 lbs with 200 tread wear tires. · GT3 Ford Cortina GT 1964-1968 newly classified for competition. · 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. · GT3 now permits current FP spec line cars to compete while maintaining their full FP rule set. · GT3 Mazda MZR 2.0L fuel induction restrictor increases from 31 to 32 mm. · GT3 Mazda Renesis and 13B Bridgeport choke reduced from 44mm to 42mm. · 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. · 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. · GT3 Mazda MZR and MZR/L5-VE fuel induction sizing changes from 31 to 32. · GT3 Honda Prelude 1992-1997 classified, 2dr FWD, 104 inch wheelbase. · GT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. · GT3 Mazda 12A Peripheral Port added to rule set, 2300 cc, 2292 lbs. · 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. · GT3 4v SIR 4-cylinder engines across multiple brands increase fuel induction from 31 to 32. · GT3 and STU add Borg-Warner EFR6258 to approved turbocharger list. · GT3 Nissan KA24E loses permission to use 32mm chokes at 2280 lbs for 2011-2012 only. · P1 intake manifolds unrestricted on engines without flat plate restrictor; plenums and balance pipes prohibited on individual runner manifolds with restrictor. · GT3 Mazda MZR L5-VE gets 31mm SIR restrictor, weight up from 1950 to 2195 lbs, direct injection banned. · 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. · GT3 Mazda 13B Bridgeport restrictor reduced from 44mm to 42mm. · GT3 Alfa Romeo 4C classified with 1742cc engine, 33mm TIR restrictor, 2325 lbs minimum weight. · GT3 Mazda MZR/L5-VE gets unrestricted induction, drops 245 lbs to 1950, limited to GT2 prep. · GT3 Honda K20C1 turbocharged engine added with 33 mm TIR restrictor, 2350 lbs minimum weight. · GT3 wing end plates change from 11.00 by 4.00 inches rectangle to maximum 64 square inches. · 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. · GT3 Nissan adds SR16VE engine, 1596cc, 1690 lbs, unrestricted induction. · GT3 Mazda 12A Bridgeport gains optional 42mm choke at 2010 lbs minimum weight. · P1 traction control prohibited in GCR section 9.1.8.C.H. · 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. · 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. · P1 Engine Table reference cleaned up; no performance change. · P1 Mazda Renesis Rotary removed from Engine Table specification line. · GT3 Mazda 13B and Renesis engines reclassified with new weight specs ranging 2080–2350 lbs. · 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. · GT3 13B and Renesis rotaries gain 200 lbs minimum weight; 13B Peripheral Port to 2400, Bridge Port to 2400, Renesis Peripheral Port to 2450, Bridge Port to 2450. · GT3 adds Mitsubishi 4G69 SOHC 2378cc engine, 2195 lbs minimum weight, 31mm SIR. · P1 closed cockpit single-seat cars moved from subsection J.5 to subsection B.4; prohibition unchanged. · P1 engine table reference corrected from 'above' to 'below'; ECU throttle wording clarified for dual sensors and fail-safes. · 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
GT3 Remove Nissan VG30 engine from GT3 #33609removedremovedGT3 Nissan VG30 engine removed from class entirely.
GT3 GT3 Choke option effective 1-01-2023 #33669inductioninductionGT3 normally aspirated cars may use intake chokes instead of SIRs, fitted to each carburetor barrel, same size as required SIR.
GT3 GT3 2.0L choke/weight option #33670inductionfasterGT3 2.0L 4-valve non-turbo engines may run unrestricted at 2060 lbs instead of with a choke restriction.
GT3 Turbocharged Engine Rules #33145cars addedcars addedGT3 Mazda BP4W Turbocharged OEM engine added at 2060 lbs with 34mm TIR and IHI RHF5 VJ35 turbocharger.
GT3 GT2 (TA2)/GTA Part Number Update #33315wordingwordingGT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870.
GT3 GT3 Nissian SR20VET unrestricted ECU change #33432enginefasterGT3 Nissan SR20VET turbo changes to GT2860RS and allows open ECU instead of OEM stock.
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.
GT3 GT3 Turbo Displacement Clarification #32952enginefasterGT3 Turbo maximum displacement increases from 1800 cc to 1850 cc.
P1 E&O clarification regarding forced induction #33123inductionslowerP1 forced induction banned: turbocharging and supercharging no longer allowed.
GT3 Tail lights on all GT category race cars. #32799wordingwordingGT 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 #32964wordingwordingP1 motorcycle-based engines with individual throttle bodies must install flat plate restrictors within 4 inches of primary butterfly.
GT3 Correct Model GT3 - Fiat #32776wordingwordingGT3 Fiat 124 Spider model name corrected from Pininfarina to Pininfarina Spider.
GT3 Correct Fiat Spider Years #32149wordingwordingGT3 Fiat 124 Spider Pininfarina reclassified by model year, body style, drivetrain, and wheelbase.
GT3 wheel size addition #32247tyres & wheelsfasterGT3 cars can use up to 18" wheels with 12.0" tire cross section and 26.0" diameter at 5% weight penalty, down from 8%.
P1 E&O Clarification of Bodywork Rules #32468wordingwordingP1 bodywork rules clarified: cycle fenders prohibited, side body minimum height at front axle centerline required, air ducting for downforce banned.
GT3 GT3 TCR Car Feedback #31677engine +2 lbsslowerGT3-TCR: Audi RS3 LMS SEQ power to 90%, weight to 3177 lbs; RS3 LMS DSG power to 90%; Honda Civic Type R power to 90%, weight to 3210 lbs; Hyundai i30N power to 90%, weight to 3254 lbs; VW Golf GTI SEQ power to 90%, weight to 3177 lbs; Gol…
GT3 Request to Classify Ginetta G40 in GT3 #31598cars addedcars addedGT3 Ginetta G40 classified with Mazda MZR 1999cc at 2060 lbs or Ford Duratec 2260cc at 2195 lbs.
GT3 Volvo S60 in GT3 #31970cars addedcars addedVolvo S60 2000-2009 classified in GT3.
GT3 GT3 2.0L 4V engines now unrestricted. #32190enginefasterGT3 2.0L 4V engines now unrestricted at 2195 lbs minimum weight across all makes.
GT3 TB correction to wing wording #32191wordingwordingGT3 wing wording corrected: single element airfoil scaled changed to up to maximum chord 10.75 inches.
GT3 Request to add Fiat to GT3 CARS #31803cars addedcars addedGT3 adds Fiat Spider 2000, Years 79-81, RWD, 89.76" wheelbase.
GT3 Request to add Fiat to GT3 CARS #31804cars addedcars addedGT3 adds Fiat X-19, years 72-89.
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.
GT3 31032 correction to weight #31525weight -210 lbsfasterGT3 Fun Cup Beetle Sealed weight reduced 210 lbs, to 1850.
GT3 Add TCR cars to GT3 #31540cars addedcars addedGT3-TCR class added: Audi RS3 LMS, Honda Civic Type R, Hyundai i30N, VW Golf GTI at 3100–3200 lbs with 200 tread wear tires.
GT3 Please approve 1964-1968 Ford Cortina GT for competition in GT# #30941cars addedcars addedGT3 Ford Cortina GT 1964-1968 newly classified for competition.
GT3 Request car classification #31032cars addedcars addedGT3 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 #31012wordingwordingP1 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.
GT3 Request to Update GTA Obsolete Part Numbers #30615wordingwordingGTA 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 addedcars addedP1 adds 1355cc motorcycle-based engine spec line with no restrictor required, minimum weight 1075 lbs.
GT3 Request to Permit FP cars in GT3 #30611cars addedcars addedGT3 now permits current FP spec line cars to compete while maintaining their full FP rule set.
GT3 Mazda MZR 2.0L Engine #30455inductionfasterGT3 Mazda MZR 2.0L fuel induction restrictor increases from 31 to 32 mm.
GT3 Disfranchised GT3 Mazda, correct choke size #30570inductionslowerGT3 Mazda Renesis and 13B Bridgeport choke reduced from 44mm to 42mm.
P1 E&O tonneau cover provision in cockpit opening section #30458wordingwordingP1 tonneau cover wording clarified: equipment must be securely attached; covers allowed for minimum dimensions.
P1 Update Spec Line B Notes #30498wordingwordingP1 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 #30499wordingwordingP1 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 #30424wordingwordingP1 Spec Line A clarifies carburetor induction only, one per cylinder, balance tubes not allowed.
P1 Clean up Spec Line H notes section #30425wordingwordingP1 Spec Line H notes clarify peripheral port or bridgeport allowed.
P1 E&O restrictor terminology #30285wordingwordingP1 engine table updates terminology from inlet to intake restrictor across multiple spec lines.
GT3 Mazda MZR SIR Sizing #29555inductionfasterGT3 Mazda MZR and MZR/L5-VE fuel induction sizing changes from 31 to 32.
GT3 Request to Classify 1992-1997 Honda Prelude #29687cars addedcars addedGT3 Honda Prelude 1992-1997 classified, 2dr FWD, 104 inch wheelbase.
GT3 GT Category Wording #29193wordingunclearGT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line.
GT3 Request to add Mazda 12A Peripheral Port to GT3 rule set #28842cars addedcars addedGT3 Mazda 12A Peripheral Port added to rule set, 2300 cc, 2292 lbs.
GT3 TA2 Gurney flap wicker clarification #28874wordingwordingTA2 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.
GT3 STO Gurney flap wicker clarification #28883wordingwordingSTO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules.
GT3 GT3 4v SIR size increase. #28931inductionfasterGT3 4v SIR 4-cylinder engines across multiple brands increase fuel induction from 31 to 32.
GT3 Request for Addition to GT3 Approved Turbo List #27576wordingwordingGT3 and STU add Borg-Warner EFR6258 to approved turbocharger list.
GT3 Request Nissan KA24E specifications #28808inductionslowerGT3 Nissan KA24E loses permission to use 32mm chokes at 2280 lbs for 2011-2012 only.
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.
GT3 Error Regarding Mazda Engine Listing #28119induction +245 lbsslowerGT3 Mazda MZR L5-VE gets 31mm SIR restrictor, weight up from 1950 to 2195 lbs, direct injection banned.
GT3 Windshield Clips #27323wordingwordingGT1, 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 #28046wordingwordingP1 sealed DP02-spec 2.0L Mazda MZR Elan removal date extended from 1/1/2020 to 1/1/2021.
GT3 Request Factory Five Daytona coupe classification #26308cars addedcars addedFactory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs.
GT3 Request restrictor size change request #26958inductionslowerGT3 Mazda 13B Bridgeport restrictor reduced from 44mm to 42mm.
GT3 Request to Classify Alfa Romeo 4C #27322cars addedcars addedGT3 Alfa Romeo 4C classified with 1742cc engine, 33mm TIR restrictor, 2325 lbs minimum weight.
GT3 Request for Mazda 2.5l MZR/L5-VE #27570induction -245 lbsfasterGT3 Mazda MZR/L5-VE gets unrestricted induction, drops 245 lbs to 1950, limited to GT2 prep.
GT3 GT3 turbo engines add Honda #28033cars addedcars addedGT3 Honda K20C1 turbocharged engine added with 33 mm TIR restrictor, 2350 lbs minimum weight.
GT3 GT3 wing end plate #28035aerounclearGT3 wing end plates change from 11.00 by 4.00 inches rectangle to maximum 64 square inches.
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.
GT3 Requesting Increase in Choke Diameter for Mazda 12A Bridgeport #27043inductionfasterGT3 Mazda 12A Bridgeport gains optional 42mm choke at 2010 lbs minimum weight.
P1 E&O Transmissions #27098wordingunclearP1 traction control prohibited in GCR section 9.1.8.C.H.
P1 E&O Transmissions #27005wordingwordingP1 allows mechanical and solenoid shifters, prohibits electronic controls and pre-selected changes.
P1 Move minimum height provision to #27031wordingwordingP1 bodywork minimum height provision moved to aerodynamic section; 115cm height limit for aero parts added.
P1 Remove duplicative fender louver provision #27033wordingwordingP1 clarifies fender louver and brake duct rules, consolidating duplicative provisions in GCR 9.1.8.C.
P1 Missing word E&O #26919wordingwordingP1 anti-intrusion panels now allowed anywhere on chassis sides, previously restricted.
P1 E&O correction to GCR 9.1.8.C.C. #26927wordingwordingP1 bodywork wording corrected: 'a passenger' becomes 'passenger' in three GCR sections.
GT3 Request GTX Fuel injection for previous GT-1 tube frame cars #26141inductionfasterGTX tube frame cars gain fuel injection with 90mm maximum throttle body size.
GT3 Request to Classify Ligier JS2 R #26535cars addedcars addedLigier JS2 R classified in GTX, no performance parameters specified in filing.
P1 Clean up reference to engine table #26648wordingwordingP1 Engine Table reference cleaned up; no performance change.
P1 Remove redundant spec line #26692removedremovedP1 Mazda Renesis Rotary removed from Engine Table specification line.
GT3 26076 revised Spec line chart #26528engineunclearGT3 Mazda 13B and Renesis engines reclassified with new weight specs ranging 2080–2350 lbs.
GT3 Request Ride Height Clarification #26600wordingwordingGT1 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 #26590wordingwordingP1 Staudacher and Honda K20A-FD2 engine table language cleaned up; no performance changes.
GT3 Request clarification on bridge porting for rotary #26076weightslowerGT3 13B and Renesis rotaries gain 200 lbs minimum weight; 13B Peripheral Port to 2400, Bridge Port to 2400, Renesis Peripheral Port to 2450, Bridge Port to 2450.
P1 Move single-seat closed cockpit provision to #26376wordingwordingP1 closed cockpit single-seat cars moved from subsection J.5 to subsection B.4; prohibition unchanged.
P1 Correct errors in GCR section 9.1.8.C.J #26144wordingwordingP1 engine table reference corrected from 'above' to 'below'; ECU throttle wording clarified for dual sensors and fail-safes.
GT3 GTX Homologation table update #26034cars addedcars addedGTX 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 #25877wordingwordingP1 removes redundant TIR inlet restrictor provisions; SIR and flat plate restrictors remain required.
P1 Clarify Honda K20A-FD2 parts requirement #25949wordingwordingP1 Honda K20A-FD2 CN-spec clarifies allowed parts to OEM list only, no machining.
P1 Correct GCR section 9.1.8.C.J errors #25966wordingwordingP1 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 GT3" is the class's best as a share of GT3'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 GT3'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.