snowman

Hey guys I just bought a brand new ZZ4 for my 89 Iroc, I bought with a a new TPI system with over sized runners. I am going to add a NOS kit stage 1 or 2 don't know yet. I want to add a twin turbo system right after the headers and then run pipes up along side of the TPI and place to small intercoolers there using a twin turbo hood. I also have on the way a T56 tranny and A new 12 GM rear. Besides alot of frame reinforcement anything else I should consider before I start this new expensive trip. (I have a kick *** summer job to pay for all this, yes it is legal. won't pay for it all but more then 1/2). Let me know what you guys think?

Thanx Bryan
---------------------------------------
89 Iroc 350 TPI
2.77 rear
ram air
Hei distributar
hollowed out TPI
52mm throttle body

necrophile

I don't see how a zz4 will hold up with nitrous, and a twin turbo, they're strong engines, maybe for the nitrous, but I wouldn't do the twin turbo on my car...and I really don't think that just a ZZ4 and nitrous would justify a 12 bolt....I'd think you'd do okay with a good posi and a TA cover...I might be wrong but that ZZ4 wasn't designed with forced induction in mind. Probably be happier with a miniram and some afr heads...

snowman

Hey Necro thanx for your imput, do you know of any engines (V8)That would hold up to the turbos. Or would I have to build one out of specailty parts. Like I mean would I have to peice the engine together. Or can I buy one that will handle the forced injection.

Jza

Actually, I read an article recently where they sprayed a ZZ4 and it took quite a beating before a piston blew through. I think it was a 175hp shot that killed it, (that was WITH an MSD timing retard) but I'll check when I get home.

snowman

Hey thanx alot man I am wondering what I can do about the turbos will the engine hold. another thing I started looking at a 350 ramjet will that handle thetwin turbo injection with nitrious?

BigBlockJason

no way, the ramjet has a 2 bolt main, and cast crank. sorry

------------------
BigBlockJason
85 Z28 T-Tops
http://communities.msn.com/JasonsStuff/homepage

Tas

All the ZZ4 engines are limited by the pistons and rods. The rods are good till 450HP and the pistons are not forged.

------------------
-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Soon to be installed:
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

87RS402

Your going about this the wrong way. To get the most from a forced induction engine you need something with a low compression ratio, so you can run a higher boost pressure. Something in the 7.5:1 range would be great. The high hp engines your talking about all have fairly high compression (for a GM crate engine). What your going to have to do is build, or have someone build, the longblock to your specs.

To handle the nitrous or forced induction you should use forged pistons. To handle nitrous and forced induction you have to use forged pistons. I can't think of any crate engines that use low compression forged pistons.

Your also going to need a cam that is designed for your application. Something with a longer exhaust duration to help get the extra air that you forced into the cylinder out.

For the money your going to spend on the turbo setup it would be dumb not to port the heads. Even better use aftermarket heads.

Last but not least... How do you plan on getting the turbo(s) setup? That's all custom work and isn't a simple bolt in. It's going to require a custom header setup, custom exhaust piping, intake piping (on both sides of the turbo(s), and where in the world are you going to put all of this stuff so it fits under the hood? A supercharger would be alot easier, and cheaper.

[This message has been edited by 87RS402 (edited June 26, 2001).]

Tas

"We have disovered a new element. Turbonium"
https://www.thirdgen.org/messgboard/...ML/000853.html


------------------
-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Soon to be installed:
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

[This message has been edited by Tas (edited June 27, 2001).]

87RS402

OK, so he can get a twin turbo kit. That still only negates all but the last sentence of the last paragraph.

Do we need to get into the areas of fuel delivery, cooling, suspension, transmission, and chassis?

I'm still trying to figure out where to put all of the guages I'd need to monitor that thing. I can think of 6 extras that I would need off the top of my head. 5 is all I can really find room for. Then again, I'm kind of **** about knowing what is going on.

johnsjj2

I have been playing around with the idea of TT myself. I don't have the funds to do it, but the day dream is nice. Run 2, T3/T4 hybrid turbos on a TPI with LTR, and an Accel base, Comp Nitrous Roller Cam (size?), AFR 210 heads w/comp. port work, steel crank, I beam rods, splayed 4 bolt, O-ringed block, 1 big a$$ Spearco intercooler, 2 Race gates. The price would hang around 9-10k if I built this myself. With 20psi, I would guess around 750-800 hp. The good thing is a turbo setup doesn't have to be used all the time. Just step on it when needed. Just an idea. I'm not saying my numbers are all right either. Just a wish in the wind.

Later,


------------------
Joshua Johnston
1991 Z-28
Flowmaster
K&N
305 / 5spd. (Temporary)

SUPER-SPORT-CHEVY

Geee Taz, almost made me cream my pants with those pics
SSC

Tas