EZ Street (rev. 1)

This class is limited to nitrous, single turbo, centrifugal superchargers/OEM style automatic cars/trucks.

Body and chassis:
-Lexan/plexiglass window replacements permitted
-Functioning lights required.
-Sponsor lettering restricted to vehicle glass and/or hood only.
-Light weight body panels allowed.
-Stock style or ladder bar rear suspension.
-Stock style front suspension required. Full stock front frame required with stock suspension
 pick up points retained. Coil over conversions allowed. No strut conversions.
-Stock fire wall and location required.
-No front spoiler unless OEM equipped.
-No forward facing hood scoops unless OEM equipped.
-A small rear wing permitted. No molding of spill plates to quartersExhaust:
-Mufflers required. Must be commercially available units, no home built mufflers. No gutting of
 mufflers permitted. No insert style mufflers

Induction:
-Cast aluminum non tunnel ram intakes only. No carbon fiber/sheet metal intakes. Fuel injected
 entries may use fabricated sheet metal upper intake with cast aluminum lower intake.
-Single carburetor or throttle body only

Nitrous systems:
-Nitrous systems limited to 4 solenoids (2 nitrous and 2 fuel).
-Single stage systems only. Must use fogger or plate, no combination of the two will be
 permitted.
-Fogger systems limited to single nitrous and fuel nozzle per cylinder with single nitrous and
 fuel feed per nozzle.
-Plate systems limited to single plate.
-Progressive systems with 1 extra nitrous solenoid permitted.
-System limited to single 15# bottle with single -6AN feed line from bottle to engine
 compartment mounted nitrous solenoid or distribution block.
-No disconnected auxiliary nitrous equipment permitted. Only approved nitrous system may be
 on entry to pass OSCA tech inspection.

Tires:
-Maximum rear tire size 31 x13.5" DOT tire
-No slicks permitted

Transmission:
-OEM style automatic trans

Engines/ Weights Nitrous:
-Minimum weight 2900# (entries cannot be lower than base weight regardless of weight
 breaks)
-350ci 2900# +2.5#/cube over 350
-450ci 3150# +1.5#/cube over 450 up to 510
 Maximum 510ci

Engines/Weights Single Centrifugal superchargers:
-Minimum weight 2950# (entries cannot be lower than base weight regardless of weight
 breaks)
-300ci   2950# +3.3#/cube over 300
-360ci   3150# +2.5#/cube over 360
-400ci   3250# +2#/cube over 400 up to 510
 Maximum 510ci

-Max supercharger inlet diameter 102mm

Engines/ Weights Single turbocharger:
-Minimum weight 3050# (entries cannot be lower than base weight regardless of weight breaks)
-300ci   3050# +3.3#/cube over 300
-360ci   3250# +2.5#/cube over 360
-400ci   3350# +2#/cube over 400 up to 510
 Maximum 510ci

Turbochargers:
-Max turbo inlet diameter 85mm

Safety:
-Engine Diaper - Mandatory. Non SFI units OK.
-Fire System - Mandatory.
-HANS (or equivalent) device required for racers exceeding 190MPH

Fuel:
-Gasoline only

If you are building a race car and you are unclear about rules concerning your class, please contact us.

The OSCA reserves the right to impose penalties for rule infractions and on items which do not represent the intent of the class entered.