B-Spec vs EP vs FF pace at Buttonwillow Raceway Park
Quickest here:B-Spec 2:09.353 Trenton Kramer, Cal Club 2026 qualifying · EP 1:53.088 Glen McCready, Cal Club 2025 qualifying · FF 1:51.118 Eric Poulsen, Cal Club 2025 race
B-SpecEPFFsolid race · dashed qualifying · slower is lower
B-SpecEPFFsolid race · dashed qualifying · each class's best lap as a share of B-Spec's at the same event (the reference class, changeable above); 100% is level, higher is quicker
Event
B-Spec
EP
FF
Qual best
Race best
Trap
Qual best
Race best
Trap
vs B-Spec
% of B-Spec
Qual best
Race best
Trap
vs B-Spec
% of B-Spec
Cal Club 2026 CALCL262026-02-21
2:09.353Trenton Kramer · fastest of 5 · top 5 within 6.1s-1.160s (-0.89%)
2:09.916Trenton Kramer · fastest of 5 · top 5 within 2.7s-0.138s (-0.11%)
121.5Trenton Kramer+23.3 mph (+23.8%)
1:57.474Kurt Frietzsche · fastest of 4 · top 4 within 4.5s+4.386s (+3.88%)
1:57.999Kurt Frietzsche · fastest of 4 · top 4 within 4.9s+4.512s (+3.98%)
131.6Joe Carr+23.8 mph (+22.1%)
-11.917squal -11.879s
90.8%qual 90.8%
1:53.098Edward Erlandson · fastest of 2+1.054s (+0.94%)
1:54.741Edward Erlandson · fastest of 2+3.623s (+3.26%)
133.7Edward Erlandson+19.0 mph (+16.5%)
-15.175squal -16.255s
88.3%qual 87.4%
50 rule changes (B-Spec: 24, EP: 23, FF: 3)12 weight · 4 induction · 2 cars added · 2 engine · 2 suspension & brakes · 2 tyres & wheels · 25 wording · 1 other · C-Spec rear sway bars approved for Chevrolet Cruze, Dodge Dart, Ford Focus, Honda Civic, Mazda3i, Toyota Corolla with specified part numbers. · B-Spec Chevrolet Sonic and Ford Fiesta, Honda Fit notes reorganized from individual allowances to approved parts lists; wording cleanup. · B-Spec: Sonic restrictors removed, Fit MT +25 lbs to 2550, Fit CVT restrictor removed, Mini Coopers restrictors increased 2-4 mm, Versa sedans -25 lbs to 2425, Versa/IA restrictors removed. · B-Spec Mazda2 10-14 cat-delete header swap removes 50 lb weight adder option, now Mazda Motorsports PN only. · EP BMW 325i/is E30 throttle body specified as 60mm in fuel injection notes. · FF clarifies alternative tire eligibility for cars homologated 1989 or earlier with rocker arm or outboard suspension on all four corners. · EP Triumph TR2-TR4A allows 5-speed gearbox without overdrive; removes Weber carb and weight specification. · EP BMW Z3 2.5L restrictor reduced 52mm to 50mm, weight increased to 2550 lbs base; five other BMW models get smaller restrictors. · B-Spec Honda Fit MT 07-08 allows Torque Solution Shifter Cable Bushing kit TS-SCB-506. · B-Spec Ford Fiesta Hatchback and Sedan gain 55 lbs to 2525; restrictors increase 1 mm. · B-Spec Hyundai Accent and Kia Rio remove Bilstein B8 shock 33-187112 rear suspension approval. · B-Spec Honda Fit MT (07-08) becomes Runoffs-eligible; previous three-weekend Super Tour requirement removed. · EP Nissan 280Z minimum weight reduced from 2560 to 2400 lbs. · EP Mazda MX-5 1.8L 90-97 weight reduced to 2125 lbs from 2150 lbs. · HP Austin-Healey Sprite/Midget 1098cc minimum weight drops 80 lbs to 1550. · HP Volvo 142/142E gains compression ratio limit 12.0:1 and valve lift limit .425". · HP Mini Cooper 07-15 valve lift reduced to .390", from .450". · FP and HP Volkswagen Rabbit descriptions updated: Convertible changed to Cabriolet in FP; Cabriolet added to three HP engine variants. · EP, FP, HP: rear drum brake to disc conversion clarified; rotors solid, diameter limited to largest front rotor permitted. · EP Ford Mustang (94-98) fuel injected throttle body inside diameter specified at 60. · HP Plymouth Arrow transmission max speeds clarified to 4 or 5. · EP, FP, HP wheel diameter added to Appendix G as absolute maximum specification. · EP, FP, HP throttle body inside dimensions must remain stock with +/-.25mm tolerance; butterfly dimensions stock in FP, HP only. · B-Spec and C-Spec: asterisk removed from public road usage note in rule 9.1.10.D.9. · B-Spec Honda Fit MT 09-14 two pedal shutdown may be disabled by cutting/de-pinning pin 42 BKSW at main ECU connector. · B-Spec Honda Fit MT 07-08 intake restricted to Injen SP1511 only, from any Cold Air Intake Package. · EP BMW Z4 03-05 restricted to 52mm flat plate intake restrictor. · EP Fiat 124 Spider 1600 & 2000 weight drops 50 lbs to 2000; carburetors gain 2mm chokes to 36mm. · B-Spec adds Hyundai Accent Sedan (12-17) and Kia Rio Sedan (12-17), both 1591cc, 2525 lbs, 40mm FPR restrictor. · B-Spec Honda Fit MT 09-14 allows Acuity Shifter Base Bushing Kit 1954. · B-Spec Honda Fit AT 09-14 adds Weapon R Intake 301-166-301 to approved parts. · B-Spec and C-Spec shift linkage/cables no longer prohibited from any modification; approved aftermarket bushings now permitted. · HP Fiat X-1/9 base weights reduced 50–53 lbs across 1300 and 1500 spec lines. · B-Spec Hyundai Accent Hatchback and Kia Rio Hatchback model year ranges corrected. · B-Spec 07-08 Honda Fit MT minimum weight increases 50 lbs, to 2450. · Honda Fit 07-08 MT and AT approved for Bilstein B14 kit 47172401 in B-Spec. · FF adds rocker arm and outboard suspension cars optional bias ply and VFF tires; removes front-as-rear rule, adds mixing restrictions. · B-Spec Honda Fit MT intake now limited to three models with 25lb adder; Mazda2 exhaust headers allowed with up to 50lb adder; Mini Coopers FPR increased 1-2 points; Nissan Versa sedans 40lbs lighter, Yaris models 50lbs lighter. · B-Spec Hyundai Accent and Toyota Yaris weight adjustments: ±25 lbs based on rear brake type. · B-Spec Hyundai Accent and Kia Rio (12-19) allow Bilstein B14 kit #47167490 front shocks and BabyFace Fabrication sump extension #BF-HYU-PAN. · Chevrolet Spark 16-22 classified HP Pre at 1850 lbs minimum weight, fuel injected, 1399 cc. · HP Ford Festiva 88-93 minimum weight drops to 1600 lbs, variants to 1640 and 1680 lbs; compression ratio raised to 11.0:1. · B-Spec Toyota Yaris Hatchback 12-18 rear brakes now allow 10.2 inch disc alternative to 7.9 drum. · B-Spec Toyota Yaris Hatchback and Sedan may now disconnect speed sensor. · B-Spec Fiat 500 (12-17) spec line expires 1/1/26 unless appeal filed. · EP BMW Z3 and 3-series models get smaller intake restrictors: Z3 2.5L to 52mm, Z3 2.8L to 55mm, 328i to 58mm, 325i to 56mm. · EP, FP, HP: interior or exterior mirrors meeting rule 9.3.36 now permitted. · EP Honda S2000 1997cc base loses 75 lbs to 2375; 2157cc base loses 60 lbs to 2450. · EP Mazda MX-5/Miata 99-05 minimum weight drops to 2100 lbs, 2153 lbs with power adder, 2205 lbs with two adders. · FF allows older cars with rocker arm or outboard suspension to use bias ply slicks or VFF tires instead of radials.showhide
B-Spec C-Spec Rear Sway Bars #39652wordingneutralC-Spec rear sway bars approved for Chevrolet Cruze, Dodge Dart, Ford Focus, Honda Civic, Mazda3i, Toyota Corolla with specified part numbers.
B-Spec Notes section cleanup #39062wordingneutralB-Spec Chevrolet Sonic and Ford Fiesta, Honda Fit notes reorganized from individual allowances to approved parts lists; wording cleanup.
B-Spec 2026 BOP Recommendations #39475other +25 lbsunclearB-Spec: Sonic restrictors removed, Fit MT +25 lbs to 2550, Fit CVT restrictor removed, Mini Coopers restrictors increased 2-4 mm, Versa sedans -25 lbs to 2425, Versa/IA restrictors removed.
EP Request to Update E30 BMW Throttle Body Diameter Verbiage #39363wordingneutralEP BMW 325i/is E30 throttle body specified as 60mm in fuel injection notes.
FF Formula F Alternative Tire Rule Proposed Clarifications #39281wordingneutralFF clarifies alternative tire eligibility for cars homologated 1989 or earlier with rocker arm or outboard suspension on all four corners.
EP TR2 Notes E&O #39180wordingunclearEP Triumph TR2-TR4A allows 5-speed gearbox without overdrive; removes Weber carb and weight specification.
EP Balance of Power #39187induction +50 lbsslowerEP BMW Z3 2.5L restrictor reduced 52mm to 50mm, weight increased to 2550 lbs base; five other BMW models get smaller restrictors.
B-Spec Alternate Shift Cable Bushings and Rear Spring Seats #38472wordingneutralB-Spec Honda Fit MT 07-08 allows Torque Solution Shifter Cable Bushing kit TS-SCB-506.
B-Spec Fiesta BOP Adjustment #38847weight +55 lbsslowerB-Spec Ford Fiesta Hatchback and Sedan gain 55 lbs to 2525; restrictors increase 1 mm.
B-Spec Request to Remove Rear Shock From Spec Line Hyundai Accents/Kia #39017suspension & brakesunclearB-Spec Hyundai Accent and Kia Rio remove Bilstein B8 shock 33-187112 rear suspension approval.
B-Spec Update Honda Fit MT (07-08) Runoffs Eligibility #39060wordingfasterB-Spec Honda Fit MT (07-08) becomes Runoffs-eligible; previous three-weekend Super Tour requirement removed.
EP Please Lower Weight of 280Z #38871weight -160 lbsfasterEP Nissan 280Z minimum weight reduced from 2560 to 2400 lbs.
EP Miata Weight Adjustment Follow Up #38949weight -25 lbsfasterEP Mazda MX-5 1.8L 90-97 weight reduced to 2125 lbs from 2150 lbs.
EP Weight Break for 1098 Midget / Sprite #38970weight -80 lbsfasterHP Austin-Healey Sprite/Midget 1098cc minimum weight drops 80 lbs to 1550.
EP HP Volvo 142 spec omission #38994engineslowerHP Volvo 142/142E gains compression ratio limit 12.0:1 and valve lift limit .425".
EP HP Mini DOHC 1.6 #38996engineslowerHP Mini Cooper 07-15 valve lift reduced to .390", from .450".
EP Add to Rabbit description #39019wordingneutralFP and HP Volkswagen Rabbit descriptions updated: Convertible changed to Cabriolet in FP; Cabriolet added to three HP engine variants.
EP Clean-up 9.1.5.E.7e #39025wordingneutralEP, FP, HP: rear drum brake to disc conversion clarified; rotors solid, diameter limited to largest front rotor permitted.
EP Add TB size to Ford Mustang (94-98) Spec Line #39130wordingneutralEP Ford Mustang (94-98) fuel injected throttle body inside diameter specified at 60.
EP HP Plymouth Arrow spec omission #38995wordingneutralHP Plymouth Arrow transmission max speeds clarified to 4 or 5.
EP Add Wheel Diameter to Appendix G #39008wordingneutralEP, FP, HP wheel diameter added to Appendix G as absolute maximum specification.
EP Add TB ID tolerance to general Prod rules #39009wordingneutralEP, FP, HP throttle body inside dimensions must remain stock with +/-.25mm tolerance; butterfly dimensions stock in FP, HP only.
B-Spec Remove Asterisk from Rule 9 #38768wordingneutralB-Spec and C-Spec: asterisk removed from public road usage note in rule 9.1.10.D.9.
B-Spec Disabling 2 Pedal Shutdown #38354wordingneutralB-Spec Honda Fit MT 09-14 two pedal shutdown may be disabled by cutting/de-pinning pin 42 BKSW at main ECU connector.
B-Spec Update Honda Fit MT (07-08) Intake Allowance #38530inductionslowerB-Spec Honda Fit MT 07-08 intake restricted to Injen SP1511 only, from any Cold Air Intake Package.
EP BMW Z4 update #38490inductionslowerEP BMW Z4 03-05 restricted to 52mm flat plate intake restrictor.
EP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbsfasterEP Fiat 124 Spider 1600 & 2000 weight drops 50 lbs to 2000; carburetors gain 2mm chokes to 36mm.
B-Spec Add Sedan spec lines for Hyundai & Kia #37537cars addedneutralB-Spec adds Hyundai Accent Sedan (12-17) and Kia Rio Sedan (12-17), both 1591cc, 2525 lbs, 40mm FPR restrictor.
B-Spec Shifter Bushing Questions. #38048wordingneutralB-Spec Honda Fit MT 09-14 allows Acuity Shifter Base Bushing Kit 1954.
B-Spec Add Weapon R Intake to Honda Fit MT (09-14) Spec Line #38306wordingneutralB-Spec Honda Fit AT 09-14 adds Weapon R Intake 301-166-301 to approved parts.
B-Spec Update Rule 46 #38307wordingneutralB-Spec and C-Spec shift linkage/cables no longer prohibited from any modification; approved aftermarket bushings now permitted.
EP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbsfasterHP Fiat X-1/9 base weights reduced 50–53 lbs across 1300 and 1500 spec lines.
B-Spec Correct Hyundai/Kia Model Years #37943wordingneutralB-Spec Hyundai Accent Hatchback and Kia Rio Hatchback model year ranges corrected.
B-Spec 07-08 Honda Fit MT Requests #37974weight +50 lbsslowerB-Spec 07-08 Honda Fit MT minimum weight increases 50 lbs, to 2450.
B-Spec Add B14 Kit Part # to Honda Fit (07-08) Spec line #38010wordingneutralHonda Fit 07-08 MT and AT approved for Bilstein B14 kit 47172401 in B-Spec.
FF Page 228, FF tire rule 9.1.1.10.e #38251tyres & wheelsneutralFF adds rocker arm and outboard suspension cars optional bias ply and VFF tires; removes front-as-rear rule, adds mixing restrictions.
B-Spec 2025 BOP Recommendations #37520weightfasterB-Spec Honda Fit MT intake now limited to three models with 25lb adder; Mazda2 exhaust headers allowed with up to 50lb adder; Mini Coopers FPR increased 1-2 points; Nissan Versa sedans 40lbs lighter, Yaris models 50lbs lighter.
B-Spec Hyundai/Toyota Factory Rear Disc Models #37534wordingneutralB-Spec Hyundai Accent and Toyota Yaris weight adjustments: ±25 lbs based on rear brake type.
B-Spec Request to Update the Spec line for Hyundai Accent and Kia Rio #37880wordingneutralB-Spec Hyundai Accent and Kia Rio (12-19) allow Bilstein B14 kit #47167490 front shocks and BabyFace Fabrication sump extension #BF-HYU-PAN.
EP Request for Classification of Chevrolet Spark #37755cars addedneutralChevrolet Spark 16-22 classified HP Pre at 1850 lbs minimum weight, fuel injected, 1399 cc.
EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS #37939weight -100 lbsfasterHP Ford Festiva 88-93 minimum weight drops to 1600 lbs, variants to 1640 and 1680 lbs; compression ratio raised to 11.0:1.
B-Spec Toyota Yaris Hatchback (12-18) rear disc brakes #37530suspension & brakesneutralB-Spec Toyota Yaris Hatchback 12-18 rear brakes now allow 10.2 inch disc alternative to 7.9 drum.
B-Spec Yaris Speed Sensor #37536wordingneutralB-Spec Toyota Yaris Hatchback and Sedan may now disconnect speed sensor.
B-Spec Set Expiration Date For Fiat 500 #37689wordingneutralB-Spec Fiat 500 (12-17) spec line expires 1/1/26 unless appeal filed.
EP Request Competition Adjustment to BMW Z3 2.5L #37120inductionslowerEP BMW Z3 and 3-series models get smaller intake restrictors: Z3 2.5L to 52mm, Z3 2.8L to 55mm, 328i to 58mm, 325i to 56mm.
EP Interpretation of Production Rules on Mirrors #37235wordingneutralEP, FP, HP: interior or exterior mirrors meeting rule 9.3.36 now permitted.
EP Weight Reduction for Honda S2000 #37466weightfasterEP Honda S2000 1997cc base loses 75 lbs to 2375; 2157cc base loses 60 lbs to 2450.
EP Mazda 1999 Miata 1.8L #37488weight -50 lbsfasterEP Mazda MX-5/Miata 99-05 minimum weight drops to 2100 lbs, 2153 lbs with power adder, 2205 lbs with two adders.
FF Formula F Proposal to Invite Older Cars Via a Tire Rule Change #37802tyres & wheelsfasterFF allows older cars with rocker arm or outboard suspension to use bias ply slicks or VFF tires instead of radials.
Cal Club 2025 CALCL252025-02-22
2:10.513Joseph Gersch · fastest of 4 · top 4 within 6.8s
2:10.054Thomas Lepper · fastest of 4 · top 4 within 7.4s
98.1Ali Naimi
1:53.088Glen McCready · fastest of 5 · top 5 within 10.6s
1:53.487Glen McCready · fastest of 5 · top 5 within 10.6s
107.8Joe Carr
-16.567squal -17.425s
87.3%qual 86.6%
1:52.044Eric Poulsen · only car
1:51.118Eric Poulsen · only car
114.7Eric Poulsen
-18.936squal -18.469s
85.4%qual 85.8%
221 earlier rule changes on record, in force before Cal Club 2025 (from 2019)29 cars added · 29 weight · 20 induction · 19 suspension & brakes · 12 tyres & wheels · 10 engine · 2 removed · 1 aero · 93 wording · 6 other · EP BMW Z3 2.5L requires 52mm flat plate intake restrictor; Z3 2.8L 55mm; 328i/is E36 58mm; 328i/ci E46 58mm; 325i/is E46 56mm; 325i/is E36 56mm; 325is M-Technic 56mm. · B-Spec Honda Fit AT, Fit CVT, Mazda2, Mini Cooper R50 MT and CVT, Toyota Yaris remove redundant notes language. · B-Spec removes Mini Cooper Countryman R60, Cooper Paceman R61, and two Nissan Versa generations effective 2/1/25. · B-Spec Nissan Micra Cup Car spec line expires 7/1/25 unless appeal submitted by 6/30/25. · B-Spec and C-Spec cars replace wheelbase spec with induction restrictor (mm) values, effective 2025-01-01. · B-Spec Hyundai Accent and Kia Rio approve Bilstein B8 shock 33-187112 for rear suspension use. · EP BMW 325i/is E30 (84-91) weight reduced 50–52 lbs across three spec lines to 2150, 2204, 2258. · EP Triumph GT6 switches to three Weber 40 DCOE carbs with 28mm chokes, weight rises 50 lbs to 1990. · B-Spec Toyota/Scion IA Sedan 16-20 allows ST Suspension Kit 13275022, requires three Super Tour weekends and OBD-II data submission. · Honda Fit AT 07-08 B-Spec and C-Spec: rear sway bar Progress #62.1060 and any cold air intake package now allowed. · HP Sprite and Midget 1275cc and 1098cc Level 2 compression ratio raised to 12.0:1. · EP Mazda Miata front and rear track widths increased to 1516/1534 mm (59.7/60.4 in.) across all generations. · FF and FC cars with sequential gearbox must add 10 lbs. to minimum weight, down from 25 lbs. · FF Honda Fit allows Fast Forward 0.25mm oversize pistons PN FF800-110 as alternative; piston diameter spec clarified to 2.8835 inches. · FF VTEC activation valve must function; EGR blanking plate rule clarified with Fast Forward part numbers. · B-Spec and C-Spec restricted to Goodyear Eagle RS/RS-R P205/50R15 and 225/45R17 tires respectively; Hankook tires removed; wet/dry mixing prohibited. · B-Spec Sonic restrictors increased to 5-6mm, Fit weight cut 50-25 lbs, Mini Cooper weight reduced 45 lbs, various restrictor adjustments. · B-Spec and C-Spec hood pins change from optional to recommended; factory release cable may be removed if pins used. · B-Spec and C-Spec Chevrolet Sonic and Cruze allow Babyface Fabrication brake caliper pistons. · HP Volkswagen Golf and Jetta 85-92 track correction: front 1537mm (60.5in), rear 1529mm (60.2in). · B-Spec Honda Fit MT & CVT 15-19: cleaned up allowed parts notes, CVT gains Setrab transmission cooler option. · B-Spec Nissan Versa (09-11) spec line expires 1/1/2025 unless appeal filed by 12/1/2024. · B-Spec deletes redundant rule 25 in GCR Section 9.1.10.E. · B-Spec Hyundai Accent rear brakes corrected to 10.3 disc; Kia Rio rear brakes corrected to 10.3 disc. · B-Spec and C-Spec Chevrolet Sonic Bilstein B14 kit #47-171725 verified compatible, suspension wording clarified. · B-Spec Mazda2 and multiple Mini Cooper models eliminate redundant sway bar end link part number notes. · B-Spec Fiat 500 spec line changes from model year 2012–15 to 2012–17. · B-Spec Honda Fit 15-19 CVT weight increases to 2550 lbs, restrictor to 31mm. · Nissan 300ZX 84-89 classified to EP at 2550 lbs minimum, 2960cc 6-cyl SOHC, fuel injection, 12.0:1 compression limit, 0.500" valve lift limit. · Mazda RX-7 92-97 newly classified EP Prep Level 2 at 2200–2310 lbs with 13B 6-port rotary engine. · EP Mazda RX-8 (04-11) alternate spec line removed; one primary line remains. · B-Spec model descriptions standardized: trim levels and door count designations removed or replaced with body style wording. · B-Spec and C-Spec wheels must be same thickness spacers all four corners; wording clarified on offset and protrusion rules. · B-Spec Honda Fit MT 2015-19 restrictor increases 30mm to 31mm, weight rises 2525 to 2550 lbs. · B-Spec and C-Spec now permit wheels of any offset if tire doesn't protrude beyond fender; spacers allowed with differing left-right offsets per axle. · B-Spec Mini Cooper Countryman R60, Paceman R61, and Nissan Versa 1797cc spec lines expire 1/1/2025 unless appealed by 12/1/2024. · B-Spec Honda Fit 07-08 loses 125 lbs to 2400; Versa S 2020+ loses 150 lbs to 2550; Yaris iA 16-20 loses 250 lbs to 2450. · B-Spec Honda Fit 07-08 rear sway bar part number changed to Progress #62.1060. · HP removes four redundant VW spec lines: Rabbit Cabriolet 1780, Scirocco 1588, Scirocco 1780 8-valve, Scirocco 1588. · B-Spec and C-Spec eliminate case-by-case auxiliary transmission cooler approval requirement. · B-Spec Chevrolet Sonic 5dr Hatch MT allows aluminum radiator #ZZP-ZZ013. · B-Spec Honda Fit MT (09-14) and AT now split into separate spec lines with distinct allowances. · B-Spec Mazda 2 10-14 weight increases 70 lbs to 2350, cat-delete headers now permitted. · B-Spec Nissan Versa and Versa Note 2013-2019 now permit Hardrace HR-Q0146 19mm rear sway bar. · HP Honda Civic 1.5 (88-91) weight reduced to 2175 lbs base, 2229 lbs with power adder, 2284 lbs with two. · B-Spec allows Hankook tires at regionals only through 6-30-2024; Goodyear only from 7-1-2024 for all events. · B-Spec Nissan Versa Note Hatchback (2013) minimum weight drops 60 lbs to 2490. · B-Spec and C-Spec ECU and data acquisition rules clarified: ECU must be unaltered OE, no device capable of altering ECU characteristics permitted; data acquisition expanded to allow tachometer, air-fuel ratio, cylinder head temperature sen… · EP BMW Z3 2.5L weight increases to 2500 lbs, 2563 lbs with turbo, 2625 lbs with supercharger. · EP Mazda MX-5 1.8L 1990-97 minimum weight drops to 2150 lbs; 1994-97 variants to 2000, 2050, 2100 lbs respectively. · EP Triumph GT6 dual 1.75" carbs weight drops to 1940 lbs; triple Weber 40 DCOE options consolidated. · EP Honda S2000 fuel injected throttle body inside diameter increases from 62mm to 64mm. · EP Triumph TR8 dry sump allowance moved from carburetor line to notes section. · EP Porsche 944/924S 2.5L and 2.7L weight minimums corrected: 2479cc to 2306/2363 lbs, 2681cc to 2358/2415 lbs. · FF Honda Fit gains Fast Forward FF800-100 oversize piston ring pack option. · C-Spec Mazda 3i 10-13 third gear ratio corrected from 3.84 to 1.84. · C-Spec Dodge Dart 14-16 bore x stroke corrected to 88.0 x 82.0 mm, displacement to 1998 cc. · EP Porsche 944/924S combines 2.5L and 2.7L variants with new weights: 2250–2415 lbs depending on engine and year. · EP Triumph GT6 minimum weight reduced to 1800 lbs. · B-Spec adds Goodyear Eagle RS dry and wet tires as options alongside Hankook; Hankook restricted to regional events from 2024. · C-Spec adds Chevrolet Cruze, Ford Focus, Honda Civic, Mazda 3i, Toyota Corolla, VW Jetta; updates Dodge Dart, Mazda3s, Toyota Corolla specs. · EP Triumph TR8 78-81 removes alternate front hub allowance note; stock hubs now required. · EP Triumph GT6 carburetors change from SU or Stromberg to 1.5" Auto-type. · EP Triumph GT6 brakes may now use TR-6 standard or alternate calipers and discs. · B-Spec Hyundai Accent GS Hatchback restrictor plate increases from 39mm to 41mm. · B-Spec Hyundai Accent GS Hatchback model years corrected from 13–19 to 12–19. · FP and HP Sprite, Midget, and Spitfire 1500 intake valve size corrected to 36.6/(1.44). · B-Spec adds Hankook 200/580R15 Z217 tire option alongside 205/50R15 C51; C-Spec specifies 225/45R17. · B-Spec and C-Spec Chevrolet Sonic allows ZZP aluminum radiator #ZZP-ZZ013; Hatch MT restrictor increases to 34mm. · B-Spec and C-Spec bumper caps now allow positive fasteners like machine screws and T-nuts or rivet-nuts; self-drilling and sheet metal screws prohibited. · B-Spec and C-Spec allow CAN bus connections to data systems for monitoring only; systems must not send data. · B-Spec Ford Fiesta 5dr and 4dr lose 25 lbs each, to 2470 lbs minimum weight. · B-Spec Ford Fiesta 5dr and 4dr lose 25 lbs each to 2470; Honda Fit MT and CVT lose 50 lbs each to 2525; Mazda2 loses 50 lbs to 2280; Kia Rio restrictor increases from 39 to 41 mm; Mini Cooper variants gain 75 lbs to 2675 with larger restri… · C-Spec Mazda 3i Touring 2.0 Skyactive MT (12-13) newly classified with 155 hp, 148 lb-ft torque, 2900 lbs. · B-Spec minimum ride height set to 6 inches, C-Spec to 5½ inches. · B-Spec springs capped at 500# front and rear; C-Spec at 600# front, 800# rear; both may be strapped to body. · B-Spec wheels minimum weight set to 13 lbs, C-Spec to 17 lbs. · B-Spec and C-Spec allow metal threaded inserts in plastic intake manifolds for throttle body fasteners. · EP Porsche 914-6 2.0L intake valves increase to 2.0 mm, exhaust valves corrected to 38.0 mm. · B-Spec and C-Spec wording clarified: CATEGORY to CATEGORIES, rules priority clarified for tire sizes, rim widths, springs, anti-roll bars, performance equipment. · EP BMW Z3 2.5L intake restrictor reduced from 58mm to 56mm flat plate. · B-Spec Mini Cooper R56 MT/AT and Clubman R55 fuel pressure regulator increased from 40mm to 41mm with OE catalyst. · B-Spec may use helper springs up to 500 pounds rate; tender springs now prohibited. · FF Honda Fit engine adds Fast Forward part number alternatives for intake, exhaust, oil system, and scavenge pump components. · B-Spec Honda Fit 09-14 Automatic now allows aftermarket exhaust/header; Manual unchanged. · B-Spec Chevrolet Sonic and Honda Fit and Mini Cooper split into separate manual and automatic spec lines with distinct transmission ratios and final drives. · B-Spec tire rule adds Hankook 200/580R15 Z217 as alternative to 205/50R15 C51; no mixing wet and dry. · EP 79-85 RX-7 12A/13B brake spec simplification removes hub/rotor weight minimum allowance. · EP 280Z carburetor option adds Hitachi-SU 1bbl 46mm throttle bores alongside fuel injection. · EP Mazda RX-2, RX-3, RX-4, and 12A RX-7 now allow 2 bbl fuel injected throttle body w/ 42mm chokes on dual-y manifold. · EP Mazda RX-2, RX-3, RX-3SP, and RX-4 minimum weights reduced 50–52 lbs across all spec lines. · EP Triumph TR8 78-81 now allowed to run dry sump. · EP, FP, HP cylinder head ports limited to 1 inch maximum depth matching from mating surface. · EP Prep 280ZX (79-83) added to spec lines with 2425–2546 lbs, 2760cc SOHC 6-cyl, fuel injection, 12.0:1 compression limit, .500" valve lift limit. · B-Spec Honda Fit 15-19 weight drops 225 lbs to 2575 lbs. · VW New Beetle 2.5L 5-cyl added to EP at 2400–2520 lbs, 2480 cc, fuel injection, comp ratio 12.0:1 max, valve lift 0.500" max. · EP Mazda RX-7 12A/13B gains fuel injection option on dual-y manifold with 42mm choke(s). · EP VW Corrado 92-95 stroke corrected to 90.3 mm, displacement to 2792 cc. · B-Spec Mazda2 10-14 rear sway bar now allows part 0000-04-2203-RR or 0000-04-2312. · EP Subaru BRZ and Toyota 86/Scion FR-S model year ranges updated to 13-20. · B-Spec Hyundai Accent GS and Kia Rio restrictor increased from 36mm to 39mm flat plate. · EP Mazda MX-5 Global Cup 16-22 minimum weight set to 2400 lbs; sequential gearbox allowed with +150 lbs penalty. · BMW 128i (08-13) classified in EP at 2700 lbs minimum with stock throttle body, 11.0:1 compression ratio, 0.400 in. valve lift limits. · EP/FP/HP open cars may now use carbon fiber hardtops if they retain OEM appearance in all exterior profiles. · EP Mazda RX-8 13B carburetor rules clarified: dual 2bbl carb, fuel injected throttle body, or stock fuel injection permitted. · EP and FP Production clarifies idle control valve rules: stock devices allowed original, removed with blocked ports, or mechanical replaced with electronic stock type. · B-Spec allows springs strapped to body for rebound control; removes requirement for OEM or kit bump stops. · B-Spec strut tower modifications permitted for camber adjustment only, limited to 1.75 degrees. · B-Spec Mazda2 10-14 undertray part numbers corrected to DO8C-56-110A, DO8C-56-311, DO7A-56-321. · EP BMW Z3 2.5L intake restrictor reduced from 59mm to 58mm flat plate. · Ford Mustang 99-03 classified to EP at 2700/2768/2835 lbs; 94-98 Mustang weight reduced to 2550/2614/2678 lbs. · EP, FP, HP Improved Touring cars may use any DOT-approved tire per section 9.3.45 in Production class. · B-Spec Nissan Versa S 2020- classified at 2700 lbs with 38mm restrictor, 1598cc engine. · Toyota/Scion IA Sedan (2016-2020) classified for B-Spec at 2700 lbs with 38mm FPR. · B-Spec Mazda 2 (10-14) replaces Bilstein B14 suspension kit with Powerflex rear bushings; adds radiator, exhaust headers, undertray. · EP, FP, HP classes allow stock/original idle control devices unmodified or completely removed with openings blocked. · EP Porsche 968 (92-95) now allows dry sump. · EP 1979-1985 Mazda RX-7 12A and 13B weight reduced by 50-53 lbs across all configurations. · 2007-2008 Honda Fit automatic added to B-Spec at 2525 lbs with 1499 cc engine. · EP Porsche 968 intake valve size increased from 37 to 39.0 mm. · EP, FP, HP front-wheel-drive cars may alter body and suspension to install alternate transmission, transaxle, and axle shaft. · EP BMW Z3 2.5L allows alternate throttle body from 92-95 325i with Turner adapter; head casting 1738400 permitted with specific blocks. · EP Porsche 944S2 89-91 requires 56mm flat plate intake restrictor; comp ratio max 12.0:1, valve lift max 0.500". · HP Corolla GTS RWD (84-87) added at 2300 lbs; HP Corolla FX16 FWD (87-88) added at 2260 lbs; old Corolla (84-87) removed. · B-Spec upper strut slotted plates no longer require manufacturer's original bolt holes or serve as reinforcement. · HP Toyota MR-2 1.6L (85-89) track corrected to 15.47 inches front and rear. · B-Spec upper strut slotted plates no longer must use manufacturer's original bolt holes. · Honda S2000 (00-03) reclassified as EP Prep with F22c engine option: 1997cc or 2157cc, weight 2450–2636 lbs depending on displacement. · EP Nissan 240-SX S13/S14 loses 200-210 lbs minimum weight; comp ratio rises to 12.0:1, valve lift to .500. · B-Spec Mazda2 10-14 allows header PN 0000-06-2410 with 70 lb weight penalty. · EP Lotus/Caterham 7 America carburetor changed from IT fuel injection prep to fuel injection. · Daimler SP 250 classified in EP at 2165 lbs with 2548 cc OHV 8-cylinder engine. · B-Spec Honda Fit and Mini Cooper models gain alternate transmission ratios and final drives to allow Setrab 50-119-7612 cooler. · B-Spec Honda Fit 2007-08 classified with 1499cc displacement, 2450mm wheelbase, 2525 lbs minimum weight. · B-Spec Ford Fiesta 5dr Hatchback allowed Eibach rear sway bar #35143.312 or #35143.320. · B-Spec restrictor range changes from 0.060" ±0.005" to 0.050"-0.079". · B-Spec rear window wipers and wiper motor removal now allowed. · EP, FP, HP clarifies percentage weight penalties sum first, then apply to base weight, rounding to nearest pound. · 84-87 Mazda 626 reclassified from FP to HP with 2300–2415 lbs weight, 1998cc SOHC, dual 32mm carbs. · FP Fiat X1/9 brake rotors change to 257 (10.1) x 12 (.407) solid disc. · EP Mazda MX-5 year range corrected from 06-14 to 06-15. · B-Spec Mini R60 and R61 allow 4-lug hub conversion with specified bearings and brake rotors. · B-Spec Mazda2 10-14 header replacement allowed, minimum weight increases 2330 to 2380 lbs. · B-Spec Honda Fit model years expand from 09-12 to 09-14. · B-Spec Hyundai Accent GS and Kia Rio restrictor reduced from 40mm to 36mm flat plate. · B-Spec must use Hankook P205/50ZR15 Z214 C51 or Z217 rain tyres for SCCA Majors, Super Tour, Runoffs. · Mazda 3 S 04-08 classified in EP at 2350 lbs minimum, 2.26L DOHC, 12.0:1 compression, .500" valve lift limit. · FF block relief permitted only as needed to fit allowed crankshaft. · B-Spec tire rules clarified: Hankook Z214 dry and Z217 rain required at Majors/Super Tour/Runoffs after 6-1-2021; regional racing allows any DOT race tire through 2021. · B-Spec restrictor thickness set to 0.060 inches plus or minus 0.005 inches. · B-Spec Hyundai Accent GS Hatchback 2013-2019 classified at 2525 lbs with 40mm flat plate restrictor. · B-Spec Mini Cooper Countryman R60 and Paceman R61 production years corrected from 11-13 to 11-16. · B-Spec Toyota Yaris Hatch model year spans corrected from 07-12 to 07-11 and 12-18 added. · B-Spec Mini Cooper all models ride height minimum 5 inches measured from metal under door rocker molding. · B-Spec allows removal or material modification of metal or plastic brake dust shields. · B-Spec Mini Cooper Clubman R55 11-15 permitted OBX header with 40mm flat plate restrictor. · EP Austin-Healey 3000 Mk. I, II, III now allows TR-6 front calipers and discs as alternate. · B-Spec: Bilstein B14 suspension kits removed from all car spec lines; clarified B14 shock or strut use requires CRB approval of mounting adaptors. · B-Spec removes Chevrolet Sonic 12-19, clarifies Toyota Yaris Hatch 07-12 and Sedan 07-12. · FP Volkswagen Golf and Jetta 1.8 lose 50 lbs each, to 1900. HP Jetta GLI engine code removed. · EP, FP, HP Level 1 and Level 2 induction systems: clarified carburetor and fuel injection rules, jets/needles/rods unrestricted in Level 2. · EP Datsun SRL 311U Roadster minimum weight reduced to 1925 lbs from 2000 lbs. · EP Triumph TR8 78-81 weight reduced from 2600 to 2500 lbs. · FF class cylinder head may now have optional coolant bleed line fitting to top of head for air release. · FF Honda LC1 ECU by HPD permitted effective 12/1/2020, must use HPD lambda sensor. · HP 84-87 Toyota Corolla wheel diameter increases from 13 to 15 inches. · B-Spec Mini Cooper R56 40mm flat plate restrictor requirement removed, suspension and header parts now allowed. · EP BMW Z3 2.5L iron block casting 1738566-C designation removed, wording clarification only. · FF Honda LC1 ECU implementation date changed from 3/1/2020 to pending availability of support materials. · Porsche 911 S 67-68 classified in EP at three weight levels: 1800, 1845, or 1890 lbs. · B-Spec wheelbase measurements converted from inches to millimeters for consistency across all cars. · EP BMW 2.8L, 328i E36/E46, and 325i E36 blocks now iron only; 325i E46 aluminum only. · B-Spec Chevrolet Sonic 5dr Hatch and 4dr Sedan allow Setrab transmission cooler for automatic-equipped cars. · B-Spec: multiple models allow specific suspension kits and damper assemblies. · B-Spec sunroof retention wording removed, simplifying rules. · B-Spec Ford Fiesta 5dr gets 36mm restrictor, 4dr gets 34mm, Honda Fit 09-12 loses 25 lbs to 2525, Fit 15-20 restrictor reduced 32mm to 30mm, Mini Cooper 07-10 gets 40mm restrictor. · 1990-1994 Mazda Protege classified in FP Pre at 2150–2258 lbs with 1839cc DOHC engine, fuel injection. · HP Mini Cooper model year ranges for convertibles revised: 02-06 now includes 05-08, 07-13 now includes 09-15. · EP Caterham 7 Spec Line removes redundant suspension note, clarifies engine prep limits and comp ratio to 10.0:1. · FF alternator changes from not required to optional. · B-Spec Sonic extended to 2019, Fiat 500 limited to 2015, Fiesta models extended to 2019, Fit expanded to 2015-2019. · B-Spec Mini Cooper R50, R55, R58, R60, R61 models newly classified at 2545–2625 lbs with 40mm restrictor for 12+ models. · B-Spec fog lamps must now be removed and holes completely covered, reversing prior allowance. · B-Spec Chevrolet Sonic 4dr Sedan (12-19) added at 2650 lbs with 32mm flat plate restrictor. · EP BMW Z3 2.5L compression ratio capped 12.0:1, valve lift .500, 59mm restrictor required; Z3 2.8L same limits added; 944S2 compression 12.0:1, valve lift .500, 56mm restrictor required. · EP BMW 325is M-Technic loses 100–105 lbs across three weight configurations, to 2550–2678. · HP Datsun 510 gains 40 DCOE carburetor option alongside existing 40 DCN and 36mm DCNVH choices. · EP BMW fuel injected throttle body maximum inside diameter set to 64mm. · FF allows Honda HPD LC1 low-cost ECU with lambda sensor; E1 ECU no longer supported but existing units permitted if sealed. · FF rain tyres now allow Hoosier W3 Radial in addition to existing Hoosier Wet option. · B-Spec now permits automatic and CVT transmissions on all legal cars meeting spec line. · B-Spec automatic transmissions may use auxiliary coolers on case-by-case basis with part number approval. · HP Datsun 1200 carburetor choke size increases from 26mm to 30mm. · Toyota Yaris Sedan 2007- added to B-Spec at 2400 lbs with 1491cc engine. · B-Spec adds 2011-2016 Ford Fiesta 4dr Sedan, 1596cc, 2495 lbs minimum weight. · B-Spec Kia Rio 5-door/LX years expanded to 2012-2019. · B-Spec Mazda2 (10-14) allows specific suspension, intake, exhaust, and bushing parts; removes air duct Mz26-117-33100. · FP and EP Mazda Miata models standardized to 55mm throttle body diameter; brake spec clarified. · B-Spec Mini Cooper production years corrected to 2011-13. · EP, FP, HP cylinder head rules reorganized for clarity; no performance change. · B-Spec Mazda 2, Fiat 500, 2007-10 Mini Cooper permitted to replace primary cat/exhaust manifold with approved header. · B-Spec removes year-specific eligibility and twelve-year competition window wording. · B-Spec Honda Fit model year expanded to include 2013, now covers 2009–2013. · FP and HP Austin-Healey Sprite Mk I and MG Midget variants may replace rear bodywork aft of cockpit with stock-appearing alternate material components. · EP Mazda MX-5 Global Cup classification year changes from 16-18 to 16-19. · Production suspension rule clarifies spindles, hubs, bushings, bearings, ball joints unrestricted. · Production carb rules clarified: carburetor options, fuel injection throttle body dimensions, and intake manifold restrictions reorganised and refined. · EP, FP, HP carburetors clarified: jets, needles, metering rods, needle valves unrestricted; choke parts removable; permitted optional carburetors listed. · EP Mazda MX-5/Miata eligibility years expanded from 1999-2002 to 1999-2005. · B-Spec 2007-10 Mini Cooper gains OBX header part #10-2101-2S as permitted E&O. · EP Mazda RX-8 firewall modification allowed for 13B engine fitment in stock location. · EP, FP, HP clarified: tapered holes in ball joints now allowed for bolt conversion; wheel bearings and hubs unrestricted at any wheel. · EP open cars may now use aftermarket hardtops if they retain OEM appearance; specific model hardtop allowances removed. · B-Spec added to GCR 9.3.26 fuel cell exception list; stock fuel tank permitted. · EP Mazda RX-7 12A and 13B (79-85) lose up to 80 lbs; 13B (86-91) loses up to 79 lbs. · FF Honda Fit permitted to use 0.25mm oversize pistons, cylinder honing increased to 73.315mm maximum. · FF heat shield rule clarified: thermal wrap allowed on manifold exterior if easily removable for inspection. · FF catch tank minimum capacity rules clarified: coolant catch tank now one U.S. pint minimum, oil catch tank one U.S. quart minimum. · Canadian Nissan Micra Cup Car classified in B-Spec at 2450 lbs with 1598cc engine, Micra Cup suspension kit allowed. · Toyota Yaris (12-18) newly classified in B-Spec with 1491cc engine, 2400 lbs minimum weight, specified suspension and intake allowed. · B-Spec exhaust system wording clarified: OEM or exact replacement catalysts permitted, stock oxygen sensors required, primary converter unmodified.showhide
EP Effective date for Jan 2025 GCR updates #37654inductionslowerEP BMW Z3 2.5L requires 52mm flat plate intake restrictor; Z3 2.8L 55mm; 328i/is E36 58mm; 328i/ci E46 58mm; 325i/is E46 56mm; 325i/is E36 56mm; 325is M-Technic 56mm.
B-Spec Remove Redundant Language from Notes Sections #37337wordingneutralB-Spec Honda Fit AT, Fit CVT, Mazda2, Mini Cooper R50 MT and CVT, Toyota Yaris remove redundant notes language.
B-Spec Expire designated spec lines #37517removedneutralB-Spec removes Mini Cooper Countryman R60, Cooper Paceman R61, and two Nissan Versa generations effective 2/1/25.
B-Spec Set expiration date for Nissan Micra Cup Cars (Canadian) #37519wordingneutralB-Spec Nissan Micra Cup Car spec line expires 7/1/25 unless appeal submitted by 6/30/25.
B-Spec Remove wheelbase from spec lines and replace with Restrictor #36074inductionunclearB-Spec and C-Spec cars replace wheelbase spec with induction restrictor (mm) values, effective 2025-01-01.
B-Spec Bilstein Rear Shock Request for Hyundai Accent/Kia Rio #36965suspension & brakesneutralB-Spec Hyundai Accent and Kia Rio approve Bilstein B8 shock 33-187112 for rear suspension use.
EP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbsfasterEP BMW 325i/is E30 (84-91) weight reduced 50–52 lbs across three spec lines to 2150, 2204, 2258.
EP Triumph GT6 Adjustments #37112inductionslowerEP Triumph GT6 switches to three Weber 40 DCOE carbs with 28mm chokes, weight rises 50 lbs to 1990.
B-Spec Scion IA/Toyota Yaris/Mazda 2 DY chassis suspension #35780suspension & brakesunclearB-Spec Toyota/Scion IA Sedan 16-20 allows ST Suspension Kit 13275022, requires three Super Tour weekends and OBD-II data submission.
B-Spec Clean up 07-08 Honda Fit AT Notes Section #36542suspension & brakesfasterHonda Fit AT 07-08 B-Spec and C-Spec: rear sway bar Progress #62.1060 and any cold air intake package now allowed.
EP 1275 HP Spridget Level 2 Only #36518enginefasterHP Sprite and Midget 1275cc and 1098cc Level 2 compression ratio raised to 12.0:1.
EP NA Miata Track Width Correction #36902wordingneutralEP Mazda Miata front and rear track widths increased to 1516/1534 mm (59.7/60.4 in.) across all generations.
FF Change FF/FC Weight with Sequential Gearbox #36651weightfasterFF and FC cars with sequential gearbox must add 10 lbs. to minimum weight, down from 25 lbs.
FF Alternative Oversize Honda Fit Pistons #37064wordingneutralFF Honda Fit allows Fast Forward 0.25mm oversize pistons PN FF800-110 as alternative; piston diameter spec clarified to 2.8835 inches.
FF Update to FF EGR Blanking Plate Rule #36633wordingneutralFF VTEC activation valve must function; EGR blanking plate rule clarified with Fast Forward part numbers.
B-Spec Update Tire Rules #35984tyres & wheelsneutralB-Spec and C-Spec restricted to Goodyear Eagle RS/RS-R P205/50R15 and 225/45R17 tires respectively; Hankook tires removed; wet/dry mixing prohibited.
B-Spec BOP help for the automatic B-Specs #36161weight -50 lbsfasterB-Spec Sonic restrictors increased to 5-6mm, Fit weight cut 50-25 lbs, Mini Cooper weight reduced 45 lbs, various restrictor adjustments.
B-Spec Require hood pins #36233wordingneutralB-Spec and C-Spec hood pins change from optional to recommended; factory release cable may be removed if pins used.
B-Spec Sonic Caliper Pistons #36238wordingneutralB-Spec and C-Spec Chevrolet Sonic and Cruze allow Babyface Fabrication brake caliper pistons.
EP Errant entry in HP production line item #36231wordingneutralHP Volkswagen Golf and Jetta 85-92 track correction: front 1537mm (60.5in), rear 1529mm (60.2in).
B-Spec Clean up (15-19) Honda Fit MT & CVT Notes Sections #36068wordingneutralB-Spec Honda Fit MT & CVT 15-19: cleaned up allowed parts notes, CVT gains Setrab transmission cooler option.
B-Spec Set expiration date for Nissan Versa (09-11) #36069wordingneutralB-Spec Nissan Versa (09-11) spec line expires 1/1/2025 unless appeal filed by 12/1/2024.
B-Spec Correct error for rear brakes of Hyundai/Kia #36174wordingneutralB-Spec Hyundai Accent rear brakes corrected to 10.3 disc; Kia Rio rear brakes corrected to 10.3 disc.
B-Spec Add B14 Kit Part # to Sonic Spec line In #35969wordingneutralB-Spec and C-Spec Chevrolet Sonic Bilstein B14 kit #47-171725 verified compatible, suspension wording clarified.
B-Spec Eliminate redundant sway bar end link part #s from notes In #35970wordingneutralB-Spec Mazda2 and multiple Mini Cooper models eliminate redundant sway bar end link part number notes.
B-Spec Update Fiat 500 Spec line In #35990wordingneutralB-Spec Fiat 500 spec line changes from model year 2012–15 to 2012–17.
B-Spec Update (15-19) Honda Fit #36067weight +25 lbsslowerB-Spec Honda Fit 15-19 CVT weight increases to 2550 lbs, restrictor to 31mm.
EP NIssan 300ZX Z31 to EP #35830cars addedneutralNissan 300ZX 84-89 classified to EP at 2550 lbs minimum, 2960cc 6-cyl SOHC, fuel injection, 12.0:1 compression limit, 0.500" valve lift limit.
EP RX7 1993 and Up Request In EP Spec Lines, classify #36031cars addedneutralMazda RX-7 92-97 newly classified EP Prep Level 2 at 2200–2310 lbs with 13B 6-port rotary engine.
EP Clean-up Multiple EP RX-8 Spec Lines In EP #36156wordingneutralEP Mazda RX-8 (04-11) alternate spec line removed; one primary line remains.
B-Spec Delete trim levels/update language for spec lines #35746wordingneutralB-Spec model descriptions standardized: trim levels and door count designations removed or replaced with body style wording.
B-Spec Wheel Rules #36066wordingneutralB-Spec and C-Spec wheels must be same thickness spacers all four corners; wording clarified on offset and protrusion rules.
B-Spec Change restrictor from 30mm to 31mm (2015+ Honda Fit) and add 50# #34857inductionfasterB-Spec Honda Fit MT 2015-19 restrictor increases 30mm to 31mm, weight rises 2525 to 2550 lbs.
B-Spec Wheel Offset and Spacer Revision #35466tyres & wheelsfasterB-Spec and C-Spec now permit wheels of any offset if tire doesn't protrude beyond fender; spacers allowed with differing left-right offsets per axle.
B-Spec Set Expiration Date for Unused Spec Lines #35742wordingneutralB-Spec Mini Cooper Countryman R60, Paceman R61, and Nissan Versa 1797cc spec lines expire 1/1/2025 unless appealed by 12/1/2024.
B-Spec BOP Adjustment for Yaris iA, 2020+ Versa, and 07-08 Honda Fit #35382weight -125 lbsfasterB-Spec Honda Fit 07-08 loses 125 lbs to 2400; Versa S 2020+ loses 150 lbs to 2550; Yaris iA 16-20 loses 250 lbs to 2450.
B-Spec 07-08 Honda Fit Rear Sway Bar part # #35473wordingneutralB-Spec Honda Fit 07-08 rear sway bar part number changed to Progress #62.1060.
EP GCR Correction - Redundant HP Spec Lines #35623wordingneutralHP removes four redundant VW spec lines: Rabbit Cabriolet 1780, Scirocco 1588, Scirocco 1780 8-valve, Scirocco 1588.
B-Spec Eliminate Redundant Trans Cooler Rule #35353wordingneutralB-Spec and C-Spec eliminate case-by-case auxiliary transmission cooler approval requirement.
B-Spec Fix Sonic Hatchback MT Spec Line #35371wordingneutralB-Spec Chevrolet Sonic 5dr Hatch MT allows aluminum radiator #ZZP-ZZ013.
B-Spec Split Spec Line of Automatic and Manual 2nd Gen (09-14) Fit #35251wordingneutralB-Spec Honda Fit MT (09-14) and AT now split into separate spec lines with distinct allowances.
B-Spec Equalize Mazda 2 Headers and clean up spec line #35259weightslowerB-Spec Mazda 2 10-14 weight increases 70 lbs to 2350, cat-delete headers now permitted.
B-Spec Rear Sway Bar Request for Nissan Versa and Versa Note 2013- #35323suspension & brakesneutralB-Spec Nissan Versa and Versa Note 2013-2019 now permit Hardrace HR-Q0146 19mm rear sway bar.
EP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weightfasterHP Honda Civic 1.5 (88-91) weight reduced to 2175 lbs base, 2229 lbs with power adder, 2284 lbs with two.
B-Spec B-Spec Hankook Tire for Regionals #35055tyres & wheelsneutralB-Spec allows Hankook tires at regionals only through 6-30-2024; Goodyear only from 7-1-2024 for all events.
B-Spec Clarifying the ECU and Data Acquisition language #35236wordingneutralB-Spec and C-Spec ECU and data acquisition rules clarified: ECU must be unaltered OE, no device capable of altering ECU characteristics permitted; data acquisition expanded to allow tachometer, air-fuel ratio, cylinder head temperature sen…
EP Request to Review Z3 2.5 Spec Line #35073weight +50 lbsslowerEP BMW Z3 2.5L weight increases to 2500 lbs, 2563 lbs with turbo, 2625 lbs with supercharger.
EP Miata Alternate Head #35253weight -50 lbsfasterEP Mazda MX-5 1.8L 1990-97 minimum weight drops to 2150 lbs; 1994-97 variants to 2000, 2050, 2100 lbs respectively.
EP Honda S2000 throttle body #35272inductionfasterEP Honda S2000 fuel injected throttle body inside diameter increases from 62mm to 64mm.
EP Correction within Triumph TR8 Spec Line #35315wordingneutralEP Triumph TR8 dry sump allowance moved from carburetor line to notes section.
EP Correction to EP 924S/944 Spec Line #35317wordingneutralEP Porsche 944/924S 2.5L and 2.7L weight minimums corrected: 2479cc to 2306/2363 lbs, 2681cc to 2358/2415 lbs.
FF Honda Fit Oversize Piston Rings #35305wordingneutralFF Honda Fit gains Fast Forward FF800-100 oversize piston ring pack option.
B-Spec Mazda 3i 2010-2013 5-Speed Manual Gear Ratios #34820wordingunclearC-Spec Mazda 3i 10-13 third gear ratio corrected from 3.84 to 1.84.
B-Spec Error Correction #34955wordingneutralC-Spec Dodge Dart 14-16 bore x stroke corrected to 88.0 x 82.0 mm, displacement to 1998 cc.
EP Porsche 944/924S Rule Change Request #35002cars addedneutralEP Porsche 944/924S combines 2.5L and 2.7L variants with new weights: 2250–2415 lbs depending on engine and year.
EP Triumph GT6 Adjustments #35054weight -30 lbsfasterEP Triumph GT6 minimum weight reduced to 1800 lbs.
B-Spec B-Spec Tire #35034tyres & wheelsneutralB-Spec adds Goodyear Eagle RS dry and wet tires as options alongside Hankook; Hankook restricted to regional events from 2024.
B-Spec Initial car classifications and spec lines #34461cars addedneutralC-Spec adds Chevrolet Cruze, Ford Focus, Honda Civic, Mazda 3i, Toyota Corolla, VW Jetta; updates Dodge Dart, Mazda3s, Toyota Corolla specs.
EP Hub Note Clean Up In EP TR8 Spec Line #34649wordingneutralEP Triumph TR8 78-81 removes alternate front hub allowance note; stock hubs now required.
EP Triumph GT6 Adjustments #34662wordingunclearEP Triumph GT6 carburetors change from SU or Stromberg to 1.5" Auto-type.
EP Triumph GT6 Adjustments: Brakes #34663wordingneutralEP Triumph GT6 brakes may now use TR-6 standard or alternate calipers and discs.
B-Spec Hyundai Accent Restrictor Plate #34331inductionfasterB-Spec Hyundai Accent GS Hatchback restrictor plate increases from 39mm to 41mm.
B-Spec Hyundai Accent 2012 Model #34332wordingneutralB-Spec Hyundai Accent GS Hatchback model years corrected from 13–19 to 12–19.
EP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419wordingneutralFP and HP Sprite, Midget, and Spitfire 1500 intake valve size corrected to 36.6/(1.44).
B-Spec Allow ZZP Sonic Aluminum Radiator 1.68 #33660otherfasterB-Spec and C-Spec Chevrolet Sonic allows ZZP aluminum radiator #ZZP-ZZ013; Hatch MT restrictor increases to 34mm.
B-Spec Fasteners for Bumper Caps #33797wordingneutralB-Spec and C-Spec bumper caps now allow positive fasteners like machine screws and T-nuts or rivet-nuts; self-drilling and sheet metal screws prohibited.
B-Spec Allow CAN Bus Connection to Data Systems #33806wordingneutralB-Spec and C-Spec allow CAN bus connections to data systems for monitoring only; systems must not send data.
B-Spec Request Ford Fiesta weight reduction 25lbs #33890weight -25 lbsfasterB-Spec Ford Fiesta 5dr and 4dr lose 25 lbs each, to 2470 lbs minimum weight.
B-Spec BoB Adjustments #34208weight -25 lbsunclearB-Spec Ford Fiesta 5dr and 4dr lose 25 lbs each to 2470; Honda Fit MT and CVT lose 50 lbs each to 2525; Mazda2 loses 50 lbs to 2280; Kia Rio restrictor increases from 39 to 41 mm; Mini Cooper variants gain 75 lbs to 2675 with larger restri…
B-Spec T5 Ride Height Rules. #33552suspension & brakesneutralB-Spec minimum ride height set to 6 inches, C-Spec to 5½ inches.
B-Spec T5 Spring Allowance #33557suspension & brakesneutralB-Spec springs capped at 500# front and rear; C-Spec at 600# front, 800# rear; both may be strapped to body.
B-Spec T5 Wheel Minimum Weight #33558tyres & wheelsneutralB-Spec wheels minimum weight set to 13 lbs, C-Spec to 17 lbs.
B-Spec Threaded Metal Inserts for Plastic Intake Manifolds #34164wordingneutralB-Spec and C-Spec allow metal threaded inserts in plastic intake manifolds for throttle body fasteners.
EP 914-6 Valve Size Correction #34185enginefasterEP Porsche 914-6 2.0L intake valves increase to 2.0 mm, exhaust valves corrected to 38.0 mm.
B-Spec T5 Rules Feedback #33595wordingneutralB-Spec and C-Spec wording clarified: CATEGORY to CATEGORIES, rules priority clarified for tire sizes, rim widths, springs, anti-roll bars, performance equipment.
EP Investigate Parity of Z3 #33343inductionslowerEP BMW Z3 2.5L intake restrictor reduced from 58mm to 56mm flat plate.
B-Spec Early Model Mini #33363inductionfasterB-Spec Mini Cooper R56 MT/AT and Clubman R55 fuel pressure regulator increased from 40mm to 41mm with OE catalyst.
B-Spec Helper Versus Tender springs. #33866suspension & brakesslowerB-Spec may use helper springs up to 500 pounds rate; tender springs now prohibited.
FF Add Fast Forward Part Numbers for Honda Fit Engine #33752wordingneutralFF Honda Fit engine adds Fast Forward part number alternatives for intake, exhaust, oil system, and scavenge pump components.
B-Spec Split up Spec lines for Automatic/Manual 2nd Gen Fit #33292enginefasterB-Spec Honda Fit 09-14 Automatic now allows aftermarket exhaust/header; Manual unchanged.
B-Spec Request to Split Spec Lines for Automatic Models #33270wordingneutralB-Spec Chevrolet Sonic and Honda Fit and Mini Cooper split into separate manual and automatic spec lines with distinct transmission ratios and final drives.
B-Spec Tire Rule Request #33350tyres & wheelsneutralB-Spec tire rule adds Hankook 200/580R15 Z217 as alternative to 205/50R15 C51; no mixing wet and dry.
EP Revise 79-85 RX7 Brake Spec Line Allowance #33293wordingunclearEP 79-85 RX-7 12A/13B brake spec simplification removes hub/rotor weight minimum allowance.
EP Request alternate carburetors for EP 280z #33405wordingneutralEP 280Z carburetor option adds Hitachi-SU 1bbl 46mm throttle bores alongside fuel injection.
EP Fuel Injection 12a Mazda RX3 #33434inductionneutralEP Mazda RX-2, RX-3, RX-4, and 12A RX-7 now allow 2 bbl fuel injected throttle body w/ 42mm chokes on dual-y manifold.
EP Mazda RX3 - Weight Reduction #33436weight -50 lbsfasterEP Mazda RX-2, RX-3, RX-3SP, and RX-4 minimum weights reduced 50–52 lbs across all spec lines.
EP Request TR8 Dry Sump Allowance #33460enginefasterEP Triumph TR8 78-81 now allowed to run dry sump.
EP Review Limited Prep Port Matching Rules #33600wordingneutralEP, FP, HP cylinder head ports limited to 1 inch maximum depth matching from mating surface.
EP 280ZX Classification Request #33611cars addedneutralEP Prep 280ZX (79-83) added to spec lines with 2425–2546 lbs, 2760cc SOHC 6-cyl, fuel injection, 12.0:1 compression limit, .500" valve lift limit.
B-Spec Utilize the Data - Make BoP Changes #32179weight -225 lbsfasterB-Spec Honda Fit 15-19 weight drops 225 lbs to 2575 lbs.
EP Request to classify VW New Beetle 2.5L in EP #32725cars addedneutralVW New Beetle 2.5L 5-cyl added to EP at 2400–2520 lbs, 2480 cc, fuel injection, comp ratio 12.0:1 max, valve lift 0.500" max.
EP Request Rotary Injection on Dual Y manifold #32775inductionunclearEP Mazda RX-7 12A/13B gains fuel injection option on dual-y manifold with 42mm choke(s).
EP Request for Corrado Stroke & Displacement Correction #32985wordingneutralEP VW Corrado 92-95 stroke corrected to 90.3 mm, displacement to 2792 cc.
B-Spec Request new Mazda Rear Swaybar #32769wordingneutralB-Spec Mazda2 10-14 rear sway bar now allows part 0000-04-2203-RR or 0000-04-2312.
EP Subaru BRZ Model Years #32500wordingneutralEP Subaru BRZ and Toyota 86/Scion FR-S model year ranges updated to 13-20.
B-Spec Request to Remove Part Numbers from Kia/Hyundai Spec Lines #32378inductionslowerB-Spec Hyundai Accent GS and Kia Rio restrictor increased from 36mm to 39mm flat plate.
EP EP MX-5 Global Cup Car #32218weightslowerEP Mazda MX-5 Global Cup 16-22 minimum weight set to 2400 lbs; sequential gearbox allowed with +150 lbs penalty.
EP Please Class BMW 128i in EP #32370cars addedneutralBMW 128i (08-13) classified in EP at 2700 lbs minimum with stock throttle body, 11.0:1 compression ratio, 0.400 in. valve lift limits.
EP Inconsistency in Body Work Descriptions #32396aerofasterEP/FP/HP open cars may now use carbon fiber hardtops if they retain OEM appearance in all exterior profiles.
EP Mazda RX8 with 13b Rotary #32170wordingneutralEP Mazda RX-8 13B carburetor rules clarified: dual 2bbl carb, fuel injected throttle body, or stock fuel injection permitted.
EP Request Idle control valve clarification #32178wordingneutralEP and FP Production clarifies idle control valve rules: stock devices allowed original, removed with blocked ports, or mechanical replaced with electronic stock type.
B-Spec Request spring attachment #31351suspension & brakesneutralB-Spec allows springs strapped to body for rebound control; removes requirement for OEM or kit bump stops.
B-Spec Limit Rear Camber to 1.75 Degrees Section 9.1.10.E.35 #31393suspension & brakesslowerB-Spec strut tower modifications permitted for camber adjustment only, limited to 1.75 degrees.
B-Spec Letter 31442 Part# Correction #32060wordingneutralB-Spec Mazda2 10-14 undertray part numbers corrected to DO8C-56-110A, DO8C-56-311, DO7A-56-321.
EP EP Adjustments #31858inductionslowerEP BMW Z3 2.5L intake restrictor reduced from 59mm to 58mm flat plate.
EP 1999 3.8L Ford Mustang to EP? #31635weightfasterFord Mustang 99-03 classified to EP at 2700/2768/2835 lbs; 94-98 Mustang weight reduced to 2550/2614/2678 lbs.
EP Improved Touring Tires #32064tyres & wheelsneutralEP, FP, HP Improved Touring cars may use any DOT-approved tire per section 9.3.45 in Production class.
B-Spec Request to Classify 2020-21 Versa S #30759cars addedneutralB-Spec Nissan Versa S 2020- classified at 2700 lbs with 38mm restrictor, 1598cc engine.
B-Spec Request to Classify the Toyota IA sedan & Scion IA Sedan for 2022 #31045cars addedneutralToyota/Scion IA Sedan (2016-2020) classified for B-Spec at 2700 lbs with 38mm FPR.
EP Throttle Body and Idle Air #31800wordingneutralEP, FP, HP classes allow stock/original idle control devices unmodified or completely removed with openings blocked.
EP Porsche 968 Engine Questions #31831otherneutralEP Porsche 968 (92-95) now allows dry sump.
EP Request weight reduction for 1979-1985 Mazda RX-7 #31833weightfasterEP 1979-1985 Mazda RX-7 12A and 13B weight reduced by 50-53 lbs across all configurations.
B-Spec Request to add 2007-2008 Honda Fit #30853cars addedneutral2007-2008 Honda Fit automatic added to B-Spec at 2525 lbs with 1499 cc engine.
EP Porsche 968 Engine Questions #31478enginefasterEP Porsche 968 intake valve size increased from 37 to 39.0 mm.
EP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom #31592wordingneutralEP, FP, HP front-wheel-drive cars may alter body and suspension to install alternate transmission, transaxle, and axle shaft.
EP BMW Z3 2.5L Spec Line #31724wordingneutralEP BMW Z3 2.5L allows alternate throttle body from 92-95 325i with Turner adapter; head casting 1738400 permitted with specific blocks.
EP 944S2 Restrictor #31396inductionslowerEP Porsche 944S2 89-91 requires 56mm flat plate intake restrictor; comp ratio max 12.0:1, valve lift max 0.500".
EP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars addedneutralHP Corolla GTS RWD (84-87) added at 2300 lbs; HP Corolla FX16 FWD (87-88) added at 2260 lbs; old Corolla (84-87) removed.
B-Spec Rules Clarification of Body and Camber Plates #30814suspension & brakesneutralB-Spec upper strut slotted plates no longer require manufacturer's original bolt holes or serve as reinforcement.
EP E&O; MR2 Track #31120wordingneutralHP Toyota MR-2 1.6L (85-89) track corrected to 15.47 inches front and rear.
B-Spec Rules Clarification of Body and Camber Plates #30814suspension & brakesfasterB-Spec upper strut slotted plates no longer must use manufacturer's original bolt holes.
EP Request to Allow F22c Engine for 2000-2003 Honda S2000 #30548cars addedunclearHonda S2000 (00-03) reclassified as EP Prep with F22c engine option: 1997cc or 2157cc, weight 2450–2636 lbs depending on displacement.
EP Request a review of the S14 240SX in EP. #30873weight -200 lbsfasterEP Nissan 240-SX S13/S14 loses 200-210 lbs minimum weight; comp ratio rises to 12.0:1, valve lift to .500.
EP Lotus/Caterham 7 America Request #30392wordingunclearEP Lotus/Caterham 7 America carburetor changed from IT fuel injection prep to fuel injection.
EP Reclassify Daimler SP 250 #30721cars addedneutralDaimler SP 250 classified in EP at 2165 lbs with 2548 cc OHV 8-cylinder engine.
B-Spec Transmission Cooler Requests #30079wordingneutralB-Spec Honda Fit and Mini Cooper models gain alternate transmission ratios and final drives to allow Setrab 50-119-7612 cooler.
B-Spec Request to classify the 07 Honda Fit #30083cars addedneutralB-Spec Honda Fit 2007-08 classified with 1499cc displacement, 2450mm wheelbase, 2525 lbs minimum weight.
B-Spec Request Ford Fiesta Eibach Rear Sway Bar Part Number 35143.320 #30340otherneutralB-Spec Ford Fiesta 5dr Hatchback allowed Eibach rear sway bar #35143.312 or #35143.320.
B-Spec Restrictor rule #30474inductionfasterB-Spec restrictor range changes from 0.060" ±0.005" to 0.050"-0.079".
B-Spec Rear wipers on all cars #30585weightfasterB-Spec rear window wipers and wiper motor removal now allowed.
EP Clarify Application of Percentage Based Weight Penalties #30669weightslowerEP, FP, HP clarifies percentage weight penalties sum first, then apply to base weight, rounding to nearest pound.
EP Change Classification of 84-87 Mazda 626 from FP to HP #30350cars addedneutral84-87 Mazda 626 reclassified from FP to HP with 2300–2415 lbs weight, 1998cc SOHC, dual 32mm carbs.
EP Fiat X1/9 brake rotors #30423suspension & brakesneutralFP Fiat X1/9 brake rotors change to 257 (10.1) x 12 (.407) solid disc.
EP NC MX-5 year range correction E&O #30503wordingneutralEP Mazda MX-5 year range corrected from 06-14 to 06-15.
B-Spec Allow 4 lug hub conversion to R60 and R61 MINI #29863wordingneutralB-Spec Mini R60 and R61 allow 4-lug hub conversion with specified bearings and brake rotors.
B-Spec Honda Fit Years on Spec Line #30078wordingneutralB-Spec Honda Fit model years expand from 09-12 to 09-14.
B-Spec Hyundai/Kia restrictor size incorrect #30380inductionslowerB-Spec Hyundai Accent GS and Kia Rio restrictor reduced from 40mm to 36mm flat plate.
B-Spec Clarify tire compound in rules #30387tyres & wheelsneutralB-Spec must use Hankook P205/50ZR15 Z214 C51 or Z217 rain tyres for SCCA Majors, Super Tour, Runoffs.
EP Please Classify Mazda3 in FP #30165cars addedneutralMazda 3 S 04-08 classified in EP at 2350 lbs minimum, 2.26L DOHC, 12.0:1 compression, .500" valve lift limit.
FF Kent crankshaft clarification #30426wordingneutralFF block relief permitted only as needed to fit allowed crankshaft.
B-Spec Spec Tire Recommendation #29480tyres & wheelsneutralB-Spec tire rules clarified: Hankook Z214 dry and Z217 rain required at Majors/Super Tour/Runoffs after 6-1-2021; regional racing allows any DOT race tire through 2021.
B-Spec Make restrictor thickness unique for B Spec #30349wordingunclearB-Spec restrictor thickness set to 0.060 inches plus or minus 0.005 inches.
B-Spec Request to Classify Hyundai Accent (RB) 2012-2019 #29484cars addedneutralB-Spec Hyundai Accent GS Hatchback 2013-2019 classified at 2525 lbs with 40mm flat plate restrictor.
B-Spec Countryman production years incorrect #29864wordingneutralB-Spec Mini Cooper Countryman R60 and Paceman R61 production years corrected from 11-13 to 11-16.
B-Spec Toyota Yaris Model Year Corrections #29896wordingneutralB-Spec Toyota Yaris Hatch model year spans corrected from 07-12 to 07-11 and 12-18 added.
B-Spec Correction spec lines for ride height Mini Cooper all models #29952wordingneutralB-Spec Mini Cooper all models ride height minimum 5 inches measured from metal under door rocker molding.
B-Spec Request to Allow Removal of Stock Brake Dust Shields #29981suspension & brakesneutralB-Spec allows removal or material modification of metal or plastic brake dust shields.
B-Spec Request to allow OBX header and restrictor to R55 Clubman 08-10 #30024engineunclearB-Spec Mini Cooper Clubman R55 11-15 permitted OBX header with 40mm flat plate restrictor.
EP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakesneutralEP Austin-Healey 3000 Mk. I, II, III now allows TR-6 front calipers and discs as alternate.
B-Spec Request clarification of B14 shock package for any and all cars #29483suspension & brakesneutralB-Spec: Bilstein B14 suspension kits removed from all car spec lines; clarified B14 shock or strut use requires CRB approval of mounting adaptors.
B-Spec Cleanup of spec lines #29495removedneutralB-Spec removes Chevrolet Sonic 12-19, clarifies Toyota Yaris Hatch 07-12 and Sedan 07-12.
EP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines #29195weight -50 lbsfasterFP Volkswagen Golf and Jetta 1.8 lose 50 lbs each, to 1900. HP Jetta GLI engine code removed.
EP Correct Wording for Level 1 and Level 2 Induction Systems #29406wordingneutralEP, FP, HP Level 1 and Level 2 induction systems: clarified carburetor and fuel injection rules, jets/needles/rods unrestricted in Level 2.
EP Weight Reduction for Datsun Roadster #29409weight -75 lbsfasterEP Datsun SRL 311U Roadster minimum weight reduced to 1925 lbs from 2000 lbs.
EP EP TR8 Adjustment #29512weight -100 lbsfasterEP Triumph TR8 78-81 weight reduced from 2600 to 2500 lbs.
FF Allow Optional Coolant Bleed Line to Correct a Known Problem #29673wordingneutralFF class cylinder head may now have optional coolant bleed line fitting to top of head for air release.
FF Clarification regarding Honda LC1 ECU implementation date #29684wordingneutralFF Honda LC1 ECU by HPD permitted effective 12/1/2020, must use HPD lambda sensor.
EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheelsfasterHP 84-87 Toyota Corolla wheel diameter increases from 13 to 15 inches.
B-Spec Allowance Versus Requirement for R56 Mini Cooper #29127suspension & brakesfasterB-Spec Mini Cooper R56 40mm flat plate restrictor requirement removed, suspension and header parts now allowed.
EP EP BMW Z3 Rule Clarification #28998wordingneutralEP BMW Z3 2.5L iron block casting 1738566-C designation removed, wording clarification only.
FF Clarification regarding Honda LC1 ECU implementation #29135wordingneutralFF Honda LC1 ECU implementation date changed from 3/1/2020 to pending availability of support materials.
EP Request to Classify Porsche 911 2.0L #28456cars addedneutralPorsche 911 S 67-68 classified in EP at three weight levels: 1800, 1845, or 1890 lbs.
B-Spec Request to change units on wheelbase for consistency with wording #28786wordingneutralB-Spec wheelbase measurements converted from inches to millimeters for consistency across all cars.
EP BMW Cylinder Head Casting and Part Numbers #28708engineslowerEP BMW 2.8L, 328i E36/E46, and 325i E36 blocks now iron only; 325i E46 aluminum only.
B-Spec Transmission cooler for automatic equipped cars #28171otherneutralB-Spec Chevrolet Sonic 5dr Hatch and 4dr Sedan allow Setrab transmission cooler for automatic-equipped cars.
B-Spec Spring Update for all models #28384suspension & brakesneutralB-Spec: multiple models allow specific suspension kits and damper assemblies.
B-Spec B-Spec Balance of Performance based on 2018 and 2019 seasons #28394induction -25 lbsslowerB-Spec Ford Fiesta 5dr gets 36mm restrictor, 4dr gets 34mm, Honda Fit 09-12 loses 25 lbs to 2525, Fit 15-20 restrictor reduced 32mm to 30mm, Mini Cooper 07-10 gets 40mm restrictor.
EP Request to Classify 1990-1994 Mazda Protege #28381cars addedneutral1990-1994 Mazda Protege classified in FP Pre at 2150–2258 lbs with 1839cc DOHC engine, fuel injection.
EP Error in Mini Cooper Spec Line #28713wordingneutralHP Mini Cooper model year ranges for convertibles revised: 02-06 now includes 05-08, 07-13 now includes 09-15.
EP Caterham 7 Spec Line #28498wordingneutralEP Caterham 7 Spec Line removes redundant suspension note, clarifies engine prep limits and comp ratio to 10.0:1.
FF E&O FF Kent Engine alternator language #28204wordingneutralFF alternator changes from not required to optional.
B-Spec Request for Model Years Updating #27850wordingneutralB-Spec Sonic extended to 2019, Fiat 500 limited to 2015, Fiesta models extended to 2019, Fit expanded to 2015-2019.
B-Spec Request to classify Min Cooper models #27861cars addedneutralB-Spec Mini Cooper R50, R55, R58, R60, R61 models newly classified at 2545–2625 lbs with 40mm restrictor for 12+ models.
B-Spec remove fog lights #27947wordingneutralB-Spec fog lamps must now be removed and holes completely covered, reversing prior allowance.
B-Spec add sonic sedan #27948cars addedneutralB-Spec Chevrolet Sonic 4dr Sedan (12-19) added at 2650 lbs with 32mm flat plate restrictor.
EP Request to Review Horsepower Parity #27662engineslowerEP BMW Z3 2.5L compression ratio capped 12.0:1, valve lift .500, 59mm restrictor required; Z3 2.8L same limits added; 944S2 compression 12.0:1, valve lift .500, 56mm restrictor required.
EP E36 (92-95) Brakes Errors and Omissions #28058weightfasterEP BMW 325is M-Technic loses 100–105 lbs across three weight configurations, to 2550–2678.
EP Request to allow 40 DCOE carb for the Datsun 510 #28195inductionfasterHP Datsun 510 gains 40 DCOE carburetor option alongside existing 40 DCN and 36mm DCNVH choices.
EP Add Throttle Body Size these EP BMW Spec Lines #28422inductionslowerEP BMW fuel injected throttle body maximum inside diameter set to 64mm.
FF Honda Racing HPD low cost ECU proposal #27563engineneutralFF allows Honda HPD LC1 low-cost ECU with lambda sensor; E1 ECU no longer supported but existing units permitted if sealed.
FF Update rain tire designation #28443tyres & wheelsneutralFF rain tyres now allow Hoosier W3 Radial in addition to existing Hoosier Wet option.
B-Spec Request for Automatic Transmission Inclusion #27686wordingneutralB-Spec now permits automatic and CVT transmissions on all legal cars meeting spec line.
B-Spec Request to Add Transmission Coolers to Automatics #27687otherneutralB-Spec automatic transmissions may use auxiliary coolers on case-by-case basis with part number approval.
EP Request for Help for Datsun 1200 #27934inductionfasterHP Datsun 1200 carburetor choke size increases from 26mm to 30mm.
B-Spec Add Yaris Sedan #26797cars addedneutralToyota Yaris Sedan 2007- added to B-Spec at 2400 lbs with 1491cc engine.
B-Spec Add 2011-2016 Fiesta Sedan #26798cars addedneutralB-Spec adds 2011-2016 Ford Fiesta 4dr Sedan, 1596cc, 2495 lbs minimum weight.
B-Spec add 2015-2019 Kia Rio #26799cars addedneutralB-Spec Kia Rio 5-door/LX years expanded to 2012-2019.
B-Spec Error and Omissions #27858suspension & brakesneutralB-Spec Mazda2 (10-14) allows specific suspension, intake, exhaust, and bushing parts; removes air duct Mz26-117-33100.
EP Request to List Mazda Miata Throttle Body Size #27907wordingneutralFP and EP Mazda Miata models standardized to 55mm throttle body diameter; brake spec clarified.
B-Spec Request for Correction of Production Years for Mini Cooper #27226wordingneutralB-Spec Mini Cooper production years corrected to 2011-13.
EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661wordingneutralEP, FP, HP cylinder head rules reorganized for clarity; no performance change.
B-Spec Request for Corrections to 9.1.10 E Item #27 D and E #27224inductionfasterB-Spec Mazda 2, Fiat 500, 2007-10 Mini Cooper permitted to replace primary cat/exhaust manifold with approved header.
B-Spec Remove wording in the B-spec rules #27388wordingneutralB-Spec removes year-specific eligibility and twelve-year competition window wording.
B-Spec Request to add 2013 Honda Fit model year #27491cars addedneutralB-Spec Honda Fit model year expanded to include 2013, now covers 2009–2013.
EP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106wordingneutralFP and HP Austin-Healey Sprite Mk I and MG Midget variants may replace rear bodywork aft of cockpit with stock-appearing alternate material components.
EP Request to classify the GMX5 2019 #27263wordingneutralEP Mazda MX-5 Global Cup classification year changes from 16-18 to 16-19.
EP level one susp. component rule #27270wordingneutralProduction suspension rule clarifies spindles, hubs, bushings, bearings, ball joints unrestricted.
EP Clarification of Carb Rules - Prep 1 #27300wordingneutralProduction carb rules clarified: carburetor options, fuel injection throttle body dimensions, and intake manifold restrictions reorganised and refined.
EP Clarification of Carb Rules - Prep 2 #27301wordingneutralEP, FP, HP carburetors clarified: jets, needles, metering rods, needle valves unrestricted; choke parts removable; permitted optional carburetors listed.
EP Request Miata Eligibility - 2003 #27121cars addedneutralEP Mazda MX-5/Miata eligibility years expanded from 1999-2002 to 1999-2005.
B-Spec Request to allow OBX Header for 2007-10 Mini Cooper #26977wordingneutralB-Spec 2007-10 Mini Cooper gains OBX header part #10-2101-2S as permitted E&O.
EP Allow Firewall Modification for Fitment of 13B into RX8 #26726wordingneutralEP Mazda RX-8 firewall modification allowed for 13B engine fitment in stock location.
EP Rollcenter Correction Clarification #25873suspension & brakesfasterEP, FP, HP clarified: tapered holes in ball joints now allowed for bolt conversion; wheel bearings and hubs unrestricted at any wheel.
EP Hardtops #26476wordingneutralEP open cars may now use aftermarket hardtops if they retain OEM appearance; specific model hardtop allowances removed.
B-Spec Request to add B-Spec to GCR 9.3.26 fuel cell #26132wordingneutralB-Spec added to GCR 9.3.26 fuel cell exception list; stock fuel tank permitted.
EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbsfasterEP Mazda RX-7 12A and 13B (79-85) lose up to 80 lbs; 13B (86-91) loses up to 79 lbs.
FF Request for Oversize Honda Fit Pistons #25810enginefasterFF Honda Fit permitted to use 0.25mm oversize pistons, cylinder honing increased to 73.315mm maximum.
FF Heat Shield - Fit Intake #26102wordingneutralFF heat shield rule clarified: thermal wrap allowed on manifold exterior if easily removable for inspection.
FF Request catch cans/tanks clarification #26158wordingneutralFF catch tank minimum capacity rules clarified: coolant catch tank now one U.S. pint minimum, oil catch tank one U.S. quart minimum.
B-Spec Request to classify Canadian Nissan Micra Cup cars #25216cars addedneutralCanadian Nissan Micra Cup Car classified in B-Spec at 2450 lbs with 1598cc engine, Micra Cup suspension kit allowed.
B-Spec Request updated Toyota Yaris Spec Lines #25483cars addedneutralToyota Yaris (12-18) newly classified in B-Spec with 1491cc engine, 2400 lbs minimum weight, specified suspension and intake allowed.
B-Spec Update wording of exhaust #26022wordingneutralB-Spec exhaust system wording clarified: OEM or exact replacement catalysts permitted, stock oxygen sensors required, primary converter unmodified.
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 B-Spec" is the class's best as a share of B-Spec'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 B-Spec'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.