NA or Turbo?

[bkaab]

Well after tearing the whole car down and thinking about all this work I am putting into it for what 200-225hp NA? Every performance car I have owned has had a power adder and my friend thinks I need to learn to build without one. So After thinking it out I think an old TGP turbo setup would be a good option to make more power and still be street able with good MPG (if I can stay out of boost). Later I can upgrade the turbo and the IC to support more boost. Only issue would be the trans which will be replaced with a 5 speed later on this year.

So Should I go high compression NA or leave it stock compression and put a turbo setup on it when I find one for sale or piece one together?

So what do ya'll think? What kind of power will a stock TGP turbo setup support?

[Superdave]

For all the time, effort and money i put into my car to run 12's N/A, i could be deep into the 10's with boost. How do i feel about that? Much better when i slam open the throttle and hear the ITB's scream.


You don't need crazy high compression to make good power N/A. Build a good foundation so that if you decide to boost later on all you have to do is a cam swap and build the turbo setup.

[bkaab]

Would a set of TGP pistons be good choice compared to a stock replacement for a 3100? I would go forged but they are a out side of my price range.

[SappySE107]

3100 pistons would be ideal for the quench. 9.5:1 is low compression. 8.8:1 is lame compression. That is how I feel about it anyway:P

[bkaab]

How much boost will they be able to support?

[NateD4]

Tough questions to ask. Supported boost and compression ratio are dependent on fuel and fuel delivery. I've posted a link to a turbo engine running E85 and 11:1 with over 20psi boost. But that is direct injected.....

The better question to ask is 'how fast do you want to go & how much do you have to spend?'

For a 3.1.... If you have a turbo crank and TGP internals you could probably run 300-350 easy with a bit of intercooling and the right turbo.

[Jonpro03]

DO NOT use TGP logs for turbo plumbing. Learn from my mistakes. /cries

[bkaab]

Tough questions to ask. Supported boost and compression ratio are dependent on fuel and fuel delivery. I've posted a link to a turbo engine running E85 and 11:1 with over 20psi boost. But that is direct injected.....

The better question to ask is 'how fast do you want to go & how much do you have to spend?'

For a 3.1.... If you have a turbo crank and TGP internals you could probably run 300-350 easy with a bit of intercooling and the right turbo.

What different TGP internals? From what I've read and looking at part numbers most things are the same.

I'm shooting for 250hp-300hp. High 13s would be great but solid 14s is what id like to run consistantly.

[robert 1980]

If your going to do a 5 speed swap soon.I would say even 225whp.Would get you into the 13's easy.Onces i got the hang of racing it was easy to run 14's all day.On a stock 3400 with headers.My car isn't even completely tuned yet.
And it's like a different car.I did the same thing you are doing now last year.Either way good luck=)

[Superdave]

The TGP stuff is basically the same, it's nothing special or magical. There used to be a great page at http://www.turbograndprix.com/Extens...ifferences.htm with all the details but it's gone now.

The heads are different than the N/A version, and actually flow worse on both sides. I tested both on my bench, the TGP casting quality is terrible.


I did save some of the info somewhere, if i can find it i'll post it up.

[SappySE107]

Can I get a TGP head from you to flow as well? I would send it back of course:P

I remember that page. The 3.4 DOHC crank is about as special as a TGP crank in terms of what they said was done. 8.8:1 instead of 8.9:1. IMO, it was never worth getting a TGP motor as a stock 3.1 was going to perform just as well.

[bszopi]

There used to be a great page at http://www.turbograndprix.com/Extensive Details and Differences.htm with all the details but it's gone now.

Internet archive is your friend... http://web.archive.org/web/200906220...ifferences.htm

[bkaab]

Wow cool. I loved that site and right when I got my TGP it was gone.

[Superdave]

Can I get a TGP head from you to flow as well? I would send it back of course:P

I already ported both (about 3 years ago) but they are still sitting on my shelf still as the owner seems to have lost interest in his project.

[bkaab]

Well I guess to speed up the process I will just go back to a high compression setup. Later if I really want to I can piece together a turbo setup and then go back to lower compression.