tuned_vtec

Ok, h22 civic just recommended to use a GT35R to make 450whp on pump gas and I felt like we needed a new thread to discuss this. Why use a 600+ whp turbo and deal with tons of lag to make 450whp? Can someone please explain why this is a better choice than a smaller GT30R.

integraftw98

If you have a built motor than go with a gt30 for your 450whp. If you have a kinda built motor like just the bottom end than go with the gt35r for improvement. Thats about the easist way I can put it.

tuned_vtec

Are you sure you ment a stronger built motor for GT30R and a lesser built motor for GT35R? Whats your reasoning?

integraftw98

My reasoning is that a gt35r is able to produce 600whp. If your going to try to make 450whp on a built motor with a turbo than you want to go with a turbo that will able to make 475whp. Now if your going to build just the bottom end get a gt35r because your still going to want to upgrade the top end. So it gives more room for upgrading the horsepower.

Tchleung

For 450whp. I would stick with the GT30R for a nice powerband. I ran that witht he smaller .63 on my 2.0 GSR and I maxed taht turbo out at about 30psi. It's plenty for the street/strip. I am now upgrading to the GT35R that way I don't have to boost 30+ psi to make 500+whp.

tuned_vtec

Ok thanks..

I shouldn't have said 450whp. I meant max power on 93 which seems to be 4xx - 500.

So, can all of the GT30R's and GT35R reach this same 500 whp barrier on 93 octane.

Tchleung

I was boosting 30 psi on 94 octane if taht helps. I added water inejction after a wihle as a "just incase" later on

tuned_vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tchleung &raquo;</TD></TR><TR><TD CLASS="quote">For 450whp. I would stick with the GT30R for a nice powerband. I ran that witht he smaller .63 on my 2.0 GSR and I maxed taht turbo out at about 30psi. It's plenty for the street/strip. I am now upgrading to the GT35R that way I don't have to boost 30+ psi to make 500+whp.</TD></TR></TABLE>


More power with less boost is also something I don't totally understand. Is there no direct relationship between power level and boost level? Whats happening differently between 2 different sized turbos at the same pressure level.

Tchleung

PSI may be PSI from turbo to turbo, but CFM to CFM will be different, at the same PSI level.

I mainly upgraded because there wasn't taht much left in the GT30R from maxing out. The GT35R gives me alot mroe room to grow, and to make the same power at 30psi before, I can now do at 20, and still have alot more room to grow which I know I will want.

tuned_vtec

To increase flow to the motor, wouldn't you need to increase the size of the piping from the turbo to the intake? How can PSI be the same and the amount of air getting to the intake change just by changing whats at one end of the pipe?