YeahmanIROC

Hey guys!
So I'm in the early stages of my 1989 IROC-Z restoration. So far I've replaced the fuel pump (wahlbro 25), fuel sending unit, and will be putting new 22# injectors into the car this weekend.
While I have the rear suspension taken apart, etc. I figured I need to stop procrastonating and really nail down what parts I will plan on using for the engine, so that I can ensure my rear end supports the modifications.

My goal: 350 RWHP while maintaining the TPI and stock look of the car (no engine swap etc.)
Engine has 209,000 miles on it and has not shown and indications of failure.

As of now, I plan on removing the enigne and taking the block to be professionally cleaned and inspected. I may even just pay to have the machine shop do all of this work if the price is right. The modifications I have centered up on after some reading around are:

AFR 180 eliminator heads (~$1,600), There are different bolt angle configurations, I will need to determine the correct one for my block.
Hooker EXH headers (~$750) (open to more suggestions on this one)
Comp Cams self adjusting rockers (~$150)
Cam shaft ????? Not really sure which fits my desire best, I have seen a number of cam shaft threads on here but I will need to read more...

My questions:
At what threshold should I be replacing my rear axel/differential and does anybody have a ratio they prefer?
Will stock suspension suffice? I do not plan on the car seeing the track, dyno at most.

Thanks!

Drew

iTrader: (58)

200k miles? Yeah I'm gonna go with everything that hasn't been rebuilt is probably due. Guessing it's a 9 bolt now, probably should start looking for an aftermarket rear.

Do a few searches on TPI builds. 350 at the wheels with a long tube tpi setup might be a bit more difficult than you think.

sofakingdom

iTrader: (1)

350 at the wheels is around 425 at the crank.

Ain't happenin with TPI on top, unless you add The Force of some sort. Even people with LOTS of experience w TPI can't do that HONESTLY. (as in, track time slips, as opposed to dyno pulls)

You might get close with a Stealth Ram. A MiniRam will do it no problem with the correct supporting cast.

Good luck though, but as long as you stick with TPI, you will have to work within its (severe) limitations. It imposes HIGHLY SPECIFIC requirements on the cam in particular.

Then of course there's the matter of TUNING. If you think back to 1984 and what your smartphone looked like back then or what you were surfing the Web with, that should put into perspective what's controlling your engine. One of the first things you should consider is a newer ECM such as 0411. Even if you keep TPI.

YeahmanIROC

350 isn't a hard stop for me. I just want the most I can do while maintaining the TPI. I derived the 350 ball park after doing some forum surfing.

GeneralDisorder

iTrader: (1)

You can do it with stock *looking* TPI. But not with the actual stock TPI:

https://firstfuelinjection.com

GD