EZ Street 2011

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 , ladder bar & 4 link rear suspension. 4 link permitted on NOS and blower entries
 only.
-Stock style front suspension required. Full stock front frame required with stock suspension
 pick up points retained. Coil over conversions allowed. No strut conversions.( example vehicle
 must retain all stock components , if vehicle came with upper and lower control arms it must
 retain them)
-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 quarters

Exhaust:
-Mufflers required on all combos. Must be commercially available units, no home built mufflers.
 No gutting of mufflers permitted. No insert style mufflers , Turbo is not a muffler

Induction:
-No carbon fiber/sheet metal intakes for turbo or blower combos. Fuel injected entries may use
 fabricated sheet metal upper intake with cast aluminium lower intake.
-Single carburetor or throttle body only, fabricated intake permitted on NOS entries

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.
-No disconnected auxiliary nitrous equipment permitted. Only approved nitrous system may be
 on entry to pass OSCA tech inspection.

Tires:
-31 tall 13.5 wide max DOT tire for all combos
-Drag radial allowed all combos (we will monitor and impose penalties as we judge 
 performance)
-No slicks permitted

Transmission:
-OEM style automatic trans

Engines/ Weights Nitrous:
-350ci 2900# +2.5#/cube over 350
-450ci 3150# +1.5#/cube over 450 up to 510 (Maximum 510ci)
 SB NOS ONLY slick max size 31W = + 100lbs
 SB NOS ONLY 2 NOS systems = + 100lbs
 SB NOS ONLY no weight adder for 4 link rear suspension
 SB NOS ONLY 31/ 13.5 tire DOT tire = -100lbs

 Engines/Weights Single Centrifugal superchargers:
 Minimum SB weight 3050#
 Minimum BB weight 3150#
 Weight adder/ci
 +3.3#/cube over 300
 + 2.5#/cube over 360
 +2#/cube over 400 up to 510 (Maximum 510ci)

So the math would go like this
 300 - 360 = 198lbs 300-360cube 3.3lbs per cube
 360 - 400 = 100lbs 360-400cube 2.5lbs per cube
 400 - 440 = 80 lbs 400-510cube 2.0lbs per cube

-Max supercharger inlet diameter 115mm = max blower F2

Engines/ Weights Single turbocharger:
-Minimum weight 3100# (entries cannot be lower than base weight regardless of weight
 breaks)
-300ci 3100# +3.3#/cube over 300
 +2.5#/cube over 360
 +2#/cube over 400 up to 510 (Maximum 510ci)

Turbochargers:
-Large frame turbos permitted with reducer-Max impeller size 106mm ( no billet impellers)
-Max turbo inlet diameter 88mm-reducer must follow the general bell shape of the original inlet 
 and must end no more than 2” from the impeller directly below the end of the
 reducer                                      

-all air entering turbo must pass through 88 mm reducer and no anti-surge holes/vents
 permitted

-any entry not fitting the criteria will be disqualified or given a weight adder as deemed fit

-reducer size subject to change at any time and without notice

Weight deductions (*not applicable to turbo entries)
-stock suspension -100*
-SB NOS engines under 415 cube -200
-SB NOS engines over 415 cube -100
-F1R Blowers -100
-Air to air intercooler -100

Weights adders
-4 links add +100 (blower & nos ONLY, not permitted on turbo entries)

Safety:
-Engine Diaper - Mandatory. Non SFI units OK.
-Fire System - Mandatory.
-HANS (or equivalent) device - Mandatory

Fuel:
-Gasoline only
-No Q 16 fuel for blower or turbo

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