We all know the S2000 in B-Stock class is a dominating autocross car. Once modifications are made that push it beyond stock class, things get interesting. Typical performance mods push the S2000 into A-Street Prepared. This class is dominated by extremely light weight lotus's and powerful Z06 vettes. There has been a lot of discussion about moving the S2000 to B-Street Prepared which I think is a step in the right direction, however, BSP has nearly the same level of competition and times as ASP.
Can the S2000 be competitive in ASP? On a local level: sure. On a National level: I think it could trophy but I doubt it could win but, we may as well try so how can we build an S2000 to take full advantage of ASP rules?
It is hard to add a lot of power to the S2000 within ASP rules so I would focus on minimizing weight (2500 lbs?) and maximizing suspension/traction.

The basic set-up as I see it is:

-Double adjustable coilovers with spring rates around 9kg/mm front and 12kg/mm rear. Ride height set to 1-1.5" lower than stock
-Alignment: Front - 6 deg caster, 0 toe, -1.5/-2.0 camber. Rear - 1/8" toe in, -2.5 deg camber
-Braided brake lines
-Aggressive Autocross compound pads - Recommendations?
-Headers - Toda/Mugen/Amuse...
-Single outlet Ti exhaust
-Test Pipe - I think this is legal. Is an 02 simulator legal?
-Remove A/C
-Aluminum Crank Pulley
-Aluminum Accessory Pulleys
-Aluminum Flywheel
-Intake system - Mugen/PRM/AEM...
-Thermostat and Thermoswitch - Mugen/Spoon/Speed...
-Engine management - VAFC, ECU, (race gas?) - AEM/Mugen/Spoon...
-Light weight battery - Odyssey PC545 (12 lbs)
-Bore cylinders .0472" over
-Port match intake manifold and exhaust manifold 1" from interface
-Mill head .010" to increase compression ratio
-Replace seats with light weight race seats - Recaro SPG/Kart passenger seat
-Replace steering wheel with lighter aftermarket wheel (no airbag)
-Remove spare tire, jack, & tools
-Wheels/Tires: 17" CE28N's with 245/40-17 Front and 275/40-17 Rear Hoosier A3S03's. Would prefer wider wheels such as 8.5" Front and 10" rear. Any suggestions?

What else is legal that will improve power, decrease weight, & improve grip?

 

I can't wait to see this when it's done.

I don't know if you've had wheelspin problems at all, but I've been fighting them all year, so if I were building an ASP S2000, I'd definitely stick an aftermarket non-Torsen LSD in there...

Steve

 

An 18x10.5" in the back with 285/30 Hoosier fits okay and won't hurt gearing.

The mid-year '04 or '05 S2K, with whatever changes to motor/trans/rearend, may bring with it potentially useful UD/BD parts.

ITBs would be nice to replace the OEM manifold, though the person doing so would be pioneering it for the S2K crowd.

A real LSD.

My ASP S2000 would be found wearing a BAUW v1.0.

SP offers you the opportunity to tune handling balance with lightweight, shorter springs, instead of having to opt for gigantic, tree-trunk-heavy swaybars. Not sure your spring rates are what I'd go with. More camber too.

Full Mugen hard bushing kit.

All that stuff would probably cost upwards of $30k, and net you a nearly unstreetable car that likely won't be any faster than a stock Z06...

 

If the new Motor S2200 goes to BS and is on the same line as the Current S2000 does it then become legal to put that motor in our cars? I guess since the cars are the same you could just run that car.

 

Can you change the final drive in SP? If so, the 4.77 gears would be on my list of ASP mods.

 

Good suggestions. Keep them coming.
To answer some questions:
-I don't believe you can change final drive gears in Street Prepared (would be nice).
-You could swap the 2.2 liter as a whole package.

JZR,
-What offset on the 18x10.5 rear (I believe about 75mm?) and what about the front wheel?
-After watching the airflow off of Leeds Gulick in his Fordahl 914-6, with similar rear spoiler, while driving through some tire smoke at a local auto-x, I would definitely consider a BAUW. In your experience, is it really worth it at auto-x speeds?
-I agree with you about the anti-sway bars. I don't think they need to be replaced when using proper springs and damping.


I personally like the Torsen diff and have eliminated the inside wheel spin with suspension tuning. Maybe that will change with more grip.

 

Stock classes can't update/backdate.
In SP classes gearing changes are only allowed through update/backdate.

-Sean

 

[QUOTE]Originally posted by GEARHEAD
[B]JZR,
-What offset on the 18x10.5 rear (I believe about 75mm?) and what about the front wheel?
-After watching the airflow off of Leeds Gulick in his Fordahl 914-6, with similar rear spoiler, while driving through some tire smoke at a local auto-x, I would definitely consider a BAUW.

 

ASP does allow update back date. I know many people that do this. Corner balancing the car would also help.

I tried to run ASP out here on a regional and local level. The car just isn't competitive.

So now I have opted to go into SM2. This is virtually unlimited. This class allows everything that BS, ASP, AP allows you to do.

So I added a supercharger to the mix.

 

Jared -

Are you tired of kicking everyone's a$$ in IA?