PLAX Class & Category Calculator
Parking Lot Autocross · Madison Sports Car Club
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Mod Points
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Make
Model
Trim / Sub-Model
Year
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Modifications
Tires
Specialty Compound Tires (UTQG < 200)
General
Spring Rate Change
Exhaust Manifold Change (header)
Turbo/Supercharger Addition
Brake Conversion (incl. LB1)
Chassis Stiffening (strut brace, roll bar, etc.)
Engine Swap (except exact replacement)
Wheels & Alignment
Rim / Wheel Width Increase
in.
Only full inches count: 1.9″ → 1 pt, 2.0″ → 2 pts.
Camber / Alignment Hardware (camber plates, camber bolts)
Front
Rear
Engine & Induction
Engine Displacement Change
%
Emission Devices Removed/Tampered
device(s)
Air Intake Path Modification (not including filter element)
Intake Manifold Change/Adaptor (without carb or FI change)
Carburetor or Fuel Injection Revision (on stock manifold)
Carburetor or Fuel Injection Revision (with non-stock manifold)
Camshaft Change
Valve Size Change and/or Head Modifications (port & polish)
Computer Module Change (ECU tune, flash)
Computer Module Change with OEM Forced Induction
Intercooler Change/Replacement
Intercooler Addition
Turbo/Supercharger System Mod/Replacement
Accessory Drive Revisions (underdrive pulleys, belt routing)
Exhaust
Open Exhaust and/or Muffler Removal (muffler delete)
Exhaust System Enhancement (beyond manifold & converter changes)
Suspension
Suspension Bushing Replacement (poly bushings, spherical bearings; excl. sways/shocks)
Sway Bar (anti-roll bar) Revision/Addition
Front
Rear
Other/Additional Suspension Modification
Driveline & Weight
Final Gear Ratio Change:
None
≤ 20%
> 20%
Limited Slip Differential (LSD, posi) — add/modify
Driver's Seat Replaced with Racing Seat
Weight Reduction/Transfer Mods
mod(s)
Note:
Other points may be assessed by the Chief Tech Inspector for modifications not listed above (1 point maximum per modification). These assessments are made during tech inspection at the event.
