106 earlier rule changes on record, in force before Cal Club 2025 (from 2019)24 weight · 21 cars added · 19 induction · 13 engine · 3 suspension & brakes · 3 tyres & wheels · 14 wording · 9 other · 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. · HP Datsun 1200 carburetor changes: 40 DCN/DCNF/IDF now allow 30mm chokes instead of 26mm. · Mazda Miata models across EP and FP now have throttle body size specified at 55mm diameter. · EP, FP, HP cylinder head rules reorganized for clarity; no performance changes. · 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. · 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.showhide
Effective date for Jan 2025 GCR updates #37654induction
Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs
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.
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.
Request to allow 40 DCOE carb for the Datsun 510 #28195induction
Request to classify Porsche 914 2L in LPrep FProd #28231cars added
Request Ford Fiesta Weight Adjustment #28336weight
Request for Help for Datsun 1200 #27934inductionfasterHP Datsun 1200 carburetor changes: 40 DCN/DCNF/IDF now allow 30mm chokes instead of 26mm.
Request to List Mazda Miata Throttle Body Size #27907wordingneutralMazda Miata models across EP and FP now have throttle body size specified at 55mm diameter.
Request to Classify 2001-2003 Mazda Protege ES in FP #27922cars added
Request to Correct Track of 1988-91 Honda Civic #27487wording
Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661wordingneutralEP, FP, HP cylinder head rules reorganized for clarity; no performance changes.
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.
Request to classify the GMX5 2019 #27263wordingneutralEP Mazda MX-5 Global Cup classification year changes from 16-18 to 16-19.
Clarification of Carb Rules - Prep 1 #27300wordingneutralProduction carb rules clarified: carburetor options, fuel injection throttle body dimensions, and intake manifold restrictions reorganised and refined.
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.
Request Miata Eligibility - 2003 #27121cars addedneutralEP Mazda MX-5/Miata eligibility years expanded from 1999-2002 to 1999-2005.
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.
Hardtops #26476wordingneutralEP open cars may now use aftermarket hardtops if they retain OEM appearance; specific model hardtop allowances removed.
Request Classification of Dodge Daytona in F Production #26259weight -150 lbs
Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it and how many cars set a time. With two or more classes, "vs" is the gap of each class's best to the first class's at the same event. 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.