my 95 Z has a 355 all forged,10.8:1 compression, its built for spray, it has a 224/230 cam on a 114lsa, id like to go forced induction and keep the spray (i spray 2 stages of 125) i know i cant spray 250hp and have a turbo or supercharger. i guess what im looking for is which is going to yeild the best results, a sts turbo, or a ATI procharger. the car has a fully built 700R4, theres no breaking it, and a 3600 stall, i still have the stock 10 bolt which is getting a 3.73 gear, im keeping the 10bolt till it pops, then im going to a 12bolt. thoughts?

 

which procharger?

dunno which would be better offhand, i havnt kept up with the details on either setup due to it being totally different from what i was doing.

what kinda goals ya got? times, hp, streetability? both setups will make some decent power on a built motor. 500rwhp wouldnt be hard.
i would want to lower tyour cr some though

brook

 

Like aggie said, either would get you to the 500 RWHP level fairly easy without nitrous, but lowering your compression ratio would be a must. I like the STS turbos but I would always be worried about someone stealing the turbo. It would only take about 5 minutes with a reciprocating saw to cut the exhuast pipes and remove the turbo. Maybe I'm just too paranoid

 

Yep, I always carry a sawzall around with me for just such an occasion.

 

Ah it was you that stole my STS!!!

 

Yep, we're installing it on 5.0This's car next week.

 

Superchargers are nice because there's no lag. You can swap pulleys for variable boost.

Turbochargers are nice because they are "free" power, i.e. they don't rob power from the crank. Exhaust pressure is there one way or the other; a turbo just harnesses it. Adjustable boost systems are easy to set up and, if set up correctly, can be adjusted from inside the car, while driving (within limits of PCM and fuel).

If a turbo is too big/impeller too heavy, the power curve will drop off in the upper rev range. The engine might rev up faster than the turbo can spool, thus starving the engine for air. I have this problem in my wife's Grand National (stock turbo @ 19psi). It's really strong from 2500-4000 rpm, but 4000+ feels the same as our Bonneville. A small turbo, or one with a super-light impeller, will resist this problem, and it won't be as laggy as a big turbo, either. Then you run into the problem of the turbo not being able to move enough air to keep up with the engine's needs.

Summary:

SC: Fixed boost level without getting out the wrenches. Always keeps up with engine. No lag. Robs power to make power.

Small TC: None-minimal lag. Can't move enough air to maintain high boost at high RPM.

Big TC: Laggy. Moves plenty of air when spooled. Might not spool quickly enough to keep up with engine.

Answer: Twin small turbos.

Kiss your 10-bolt goodbye on your first full boost launch. :P

 

I don't think I've ever seen a GN with a stock turbo.

 

Hey, I just bought the thing like two months ago. The previous owner kept it in great condition. Give me a break!

That said, I've probably seen a few hundred GN's, and I'll bet half of them had the stock turbo.

 

Yes, but the 30 psi EXTRA backpressure from the turbo sure hurts. . .

 

You could always install an exhaust housing with a bigger AR. So what if it spools like a Supra.

 

Damn.. why didnt someone tell me... You have to help me install my new clutch while you're there though

 

i called thunder racing and they told me it would be dumb to put a supercharger or turbo on my car because im at 10.8:1 compression. they said im gaining more from my nitrous. so i guess ill slap alot bigger cam in it and a massive set of heads, up the spray and call it a day

 

So what is that supposed to mean? I have a large turbo on my Supra and my car spools up really quick...