Car Class Calculator - 86DRIVE Challenge

Chassis

Gen. 2 cars adhering to stock class rules can participate in stock class but will take a time handicap. Please refer to the current rules for details.

Gen. 1 (2013-2020 model year) 0.0

Gen. 2 (2022+ model year) 2.0

Tires

For Stock and Street Class, heavy tire restrictions apply (see rules for details). Any tire model not specifically outlined in this section is subject to 86DC admins assessment.

GT Radial SX2 / GT Radial HPY / Michelin Primacy HP -1.0

215/40R18 Michelin Pilot Sport 4 0.0

GT Radial SX2 RS, Kumho V730, RS4, RC-1 R1, VR-1 S1, Z3/Z3SS, RT615K, 595RSRR, CUP2 (180TW and 240TW), NS2R, SUR4, AD08R, NT01/NT05, R888, SC3, & Tread wear 240+ 2.0

Super tires: RE71RS, RT660, RC-1 R2, VR-1 S2, CR-1, AR-1, A052, Rival S, SUR4G, SC3R 3.0

Tread wear 40-99 5.0

Racing slicks 6.0

Suspension

OEM-style non-adjustable, non-rebuildable dampers with any OEM-style springs 0.0

1 & 2 way adjustable dampers and non-adjustable rebuildable dampers 1.0

3+ way adjustable dampers 2.0

Drivetrain

Aftermarket cat-back 0.0

Aftermarket intake, header, front-pipe and/or over-pipe 0.5

Aftermarket driveshaft 0.2

Flywheel and/or clutch lighter (or lower rotational inertia) than OEM 0.2

Aftermarket differential 0.2

Aftermarket transmission 1.0

Forced induction 5.0

Engine swap (FA24) 2.0

Engine swap (other) 8.0

Engine tuning

OEM Tune 0.0

Gen. 1 NA tune for 93 or lower (R+M)/2 octane rating (Non-OEM) 0.5

Gen. 1 NA tune for higher than E15 or 93 (R+M)/2 octane rating 1.5

Gen. 2 NA tune for 93 or lower (R+M)/2 octane rating (Non-OEM) 1.0

Gen. 2 NA tune for higher than E15 or 93 (R+M)/2 octane rating 2.0

FI tune for 93 or lower (R+M)/2 octane rating 0.0

FI tune for higher than E15 or 93 (R+M)/2 octane rating 2.0

Aerodynamics

Aero mods (especially custom) may warrant individual assessment by the 86DC admins

Weight reduction

Removal of any interior trim pieces or seating not required for installation of a roll cage OR completely stripped interior, regardless of cage 1.0