I've been autocrossing for 2 full seasons now, but never with SCCA. Looks like i'll be at an SCCA event next month, so i had a quick question in regards to classification. I'm not trying to compete... i'm just looking to get more seat time in and become better, faster, and more knowledgeable.

I looked it up in the rule book, and I believe i will be in STU... but i'm not sure.
- The car is Turbocharged.
- The Current wheels are 17X9
- Current Tires are 255 Falken RT-615

Is there anything else that I didn't list that could possibly have bumped me into a different class?

Thanks for the help

-hS

can't add a turbo in STU, it's Street Mod for you!

yes, but is it sm2 or sm?

as long as the weight is 2500# or greater and displacement 1.5L or less it's SM

Class SM
Eligible Vehicles:
All sedans/coupes (models which were originally equipped with a
minimum of four seats and four factory seat belts).
Excluded Vehicles:
Porsche, all
Lotus, all
Nissan / Datsun Z car 2+2, (Pre ’90)
Honda CRX
MGB GT
Triumph, all

Displacement Limits and Minimum Weights:

I. Up to 3.0L, naturally aspirated, OHC engines
Up to 4.0L, naturally aspirated, pushrod engines
FWD: 1800 pounds
RWD (front engine): 2200 pounds
AWD and RWD (rear & mid-engine): 2400 pounds

II. Up to 3.0L, forced induction, OHC engines
Up to 4.0L, forced induction, pushrod engines
FWD: 1900 pounds
RWD (front engine): 2400 pounds
AWD and RWD (rear & mid-engine): 2600 pounds

III. 3.01 to 6.0L, naturally aspirated, OHC engines
4.01 to 6.0L, naturally aspirated, pushrod engines
Up to 1.5L, rotary engines, all
FWD: 2000 pounds
RWD (front engine): 2500 pounds
AWD and RWD (rear & mid-engine): 2700 pounds

can't add a turbo in STU, it's Street Mod for you!Looks like your right... Below is where in SM it gives me the allowance for boost.

16.1 ALLOWED MODIFICATIONS
D. Drivetrain and related components (induction, ignition, fuel
systems, etc.) are unrestricted except for the following limitations:Then it goes on to certain limitations that do not apply to me.

Well, at least its one less letter to cut on the magnet.

-hS

oh ye of little faith ... :p:

It is kinda confusing though, in Appendix A:

Supplemental Class STU
Coupes/Sedans - 4 seats minimum
Engine Displacement
- any normally aspirated or
- up to 3.1L forced induction
(single turbo/supercharger).



Mazda RX-8:
STU
Mitsubishi Lancer Evolution:
STU

It is kinda confusing though, in Appendix A:
But nowhere in the rules for stock or stu rules does it say you can add forced induction to your car. If it doesn't specifically say you can, then you can't.

The forced induction in STU ( I think ) must be factory. After-market FI moves it out of the class.

I think that's how it works.

yes, the engine from the throttle body to the exhaust port face must be OE with exception for several stated allowances; A/C removal, etc.