Im building a twin turbo for my 94Z. I have everything cleared out of the way for two turbos. My two options, two TE62's or two GT40's. The 62's will be good to about 1200hp. The GT40's are good to 1400hp. However the GT's run about $1000 more for the pair.
My main question is, how much power can be used on the street? Im thinking 1200hp will never be tapped till around 100mph if that. Im wiilling to spend the extra G but if I will never use the extra 200hp its not worth it. With out the car being tubbed, those of you that have experianced this power how much can be used on the street? Then a question about the LT1 anyone know of the most power a LT1 block will hold? Baxer hit 1200hp I believe and it held together, anyone hit more then that?

I have been though so many combos I would like this to last awhile

 

I don't want to sound like a wet blanket, but $1,000 is peanuts in the contest of a project of this magnitude. And the difference between 1,200 and 1,400hp is really more in the realm of theory than representing any signficant difference in terms of "street" use. Either is gonna completely overpower any street tire you are ever going to fit on a 4th gen. IOW, it's fun bench racing, but the answer to your question is that deciding on 1,200 v. 1,400hp is a waste of time. If I were contemplating something of that nature I'd be thinking more about how to make the hp controllable. Some sort of sophisticated computer controlled wastegate I guess, though I don't know much about turbos.

What kind of transmission are you planning on?

Rich Krause

 

The car is my daily driver, im currently running it through the factory 6spd(see how long that lasts). The boost levels are controlable through a switch, there are a few different levels. Getting the car up and going is no problem. different boost and ramp setting will aid in this. Max boost is 4th gear. However, my main concern is when I hit 20+psi(or 1200-1400) will my car handle it on the street or will it burn the tires? I would like to get some insight on this. If 20+psi is going to burn the tires and I can never use the power of the GT40's, I will go with the TE62's. This and weather the block will handle the power is my main issue. Everything else is ready.

Few things about the car. Just a street car, dont plan on doing much racing at the track. If I did a lot of track running I would go GT's in a heart beat. But I believe there is only so much power that can hit the street.

 

Well, IMO my 634rwhp supercharged motor was too much for the street.

If I rolled onto the gas at 60mph I could do a burnout for as long as I held my foot down.

I'm currently freshening up the motor and building a single 80mm turbo setup.

I plan to run a multi-stage boost controller, putting down between 450-550rwhp on the street, depending on MPH, and 750rw (+?) at the track.


So, will 1200-1400hp be usable on the street? Not only no, but hell no. Not unless you have AWD and a 28in slick on each corner

 

The T56 will not hold up to that kind of hp (if it ever hooks up). With "only" 733rwhp my car would break the tires loose in 4th gear at 85mph. That's with 3.42's in the back and some fairly small tires (255/16 Comp TA). Better tires will help, but you are talking another level of hp altogether. The only practical tranny for this kind of hp is a TH400, trust me, I have considered every option. And to make it user friendly on the street, a Gear Vendors OD will be needed.

Have you really thought this through? The supporting components for that kind of hp are fairly exotic and far from cheap. Last years combo was "only" 733rwhp, this year I am stepping up to the 900-1000 range. Even at that lowly level, the added increment in performance is going to be quite costly and time consuming.

I suggest more modest goals, but to each his own.

Rich Krause

 

A local guy now in the 9s, broke his T56 I think 4 times before giving up on it, this was while in the 10s. He went built TH400 and I think broke it only twice so far, 3750 or 3850 race weight, pretty heavy.

 

I'm new to turbos, but I'd keep in mind spool time, and be realistic about it, do the math. There is a local guy running 8s, and that car takes forever to spool up.

Street race ready? I dont think so "hold on, give me another 20 seconds and I'm ready, I swear..."

Just a thought.

 

I'm with Doc on this one - "minor" things like throttle response are going to be much more important factors than peak power.
Heck, lightswitch-like throttle response gets annoying at a 1/4 of the power levels that you speak of.

I'm not familar with the turbo options that you're considering, but I gotta assume that a pair big enough to support 1400 HP are going to be just a bit on the slow side when spooling up, and will probably hit with all the subtlety of dropping a sledgehammer on your toes. And if you'll only be running on the street and with the boost turned down 99% of the time, why not go with a smaller set of turbos that are "only" capable of supporting, say, 800-1000 HP, and hopefully gain back some throttle responsiveness? Just a suggestion - I'm not a turbo expert by any means (I'm just starting into my first hair-dryer project with a bike).

 

A little back ground on the subject. The motor is already built to handle any kind of power I can throw at it as long as the block it self is strong enough. I had a GT76 turbo on the car last year, but because of back pressure I sold just about everything in the kit.(I would have kept the kit but I could not fit a bigger exhaust housing on the turbo because of kit location) Insted of reworking the exhaust...etc I decided to make a twin turbo kit.

As everyone in the performance world knows, each enthusiest is always upgrading and one will never be the fastest. I want to make sure I will never need or can use any more power then my decision. In the end I would like to have some power left over just in case I do something different with the car. So realisticly if I can only use,for example, 750rwhp on the street, then I would like to reserve 900rwhp.

Further more, I think the TE62's will support my needs. They spool very fast and I can turn them down enough to prevent surging.

Thanks for the input!
As for the T56 Im going to try and upgrade to viper internals. I dont think I will ever go with an auto, but you never know

 

The car is your daily driver? Why would you even want to build something like this for a daily driver? Not only is it double the amount of power that is actually fun on the street, but you are just setting yourself up for reliability problems (and yes, you will have those problems). If you have that much money to spend, why not just build it the way you want (big power) and spend $2k-4k on a decent, reliable daily driver that actually gets gas milege.

 

Nitrous and turbos go very well together. How about a "nice and streetable" 1000 HP car, and a 200-250 shot on top of that for those times you want to show your 1250+ HP car off.

 

IMO, this says a lot.

Listen to the good advice in this thread.

 

Gas milage??? Thats the beauty of it, I still get 18mpg thats better then my talon which is my winter beater. As for why I would want something like this for a daily....Why not, I could care less of what a time slip says. With that all you have is a car you can rarely drive, and you just look at it I want something I can drive everyday, and have the power to put my money where my mouth is
reliability problems been there done that. However its only because of the times I went to the track. Last year I made around 600rwhp. (The new combo)With the different stages of boost, I should not have any problems with traction.......

Dr. that was the plan with the GT76 that I had, but with this comb I can turn the boost all the way down to 400rwhp and up to 1100hp-1200 if I want so it eliminates the need for juice.

 

Well if you already have a daily driver You need to mention that you want a "driver" not a "daily driver" Big difference there IMO. I am all for having a car that you can drive, not just look at or track only.

Jason

 

Yes the camaro is the daily driver in the summer. The other car is just a back up....