Even a GT35R can spool to 10PSI at 3750-4250 if it was selected properly.

You should spend some more time not only looking at the relative size of compressor and turbine wheels but also think about A/R, pressure ration optimizing it for your manifold........

Personally I prefer the transient response of my 6262 with a 0.63 A/R, for me I believe that the 0.82 and 1.03 are too large for my type of driving. However if I was going to be running down the strip I would have chosen a 0.82 or 1.03 depending on my HP goal.

Pressure ratio is an entirely different subject, if you are going to be running less pressure say 10-18PSI range then you would be running most of the GT35R's inefficiently with your build. This is where the compressor maps come in to play, you need to look at the pressure ratio vs the flow and determine the best match.

Manifold design, many debate about this but I agree w/ Inline Pro that using a slightly larger turbine on an inefficient manifold, ie cast vs tubular, will help reduce the total back pressure by adding flow area thus making for a better design.

 

Ive got to disagree with IP on that. The major inefficiencies of a log manifold cant be fixed with a larger turbine. Think of the airflow path like a hose: if you kink the line at the beginning, opening up the path farther down wont make up for the restriction at the top.

Like the saying goes, a chain is only as good as its weakest link.

 

I read that and thought the same. But I have a feeling it's a slight misquote. I don't think IP are recommending a log manifold (even though there basic kit comes with one. I think they are saying if you have a log you should opt for a slightly larger turbine.

 

Yes, that is what I was driving at and should have clarified though we were talking turbo's not manifolds so I left of there.

 

I understand what they were saying, but its incorrect. Lowering the restriction in the turbo wont make up for the inefficient log manifold. Backpressure really wont change by increasing the size of the turbine.

 

I think I have my mind set in a larger turbo such as the gt35. Is their a difference in quality from Garett or precision?

 

^ Lately there seems to be more issues with Precision turbos (at least on here) than Garret's........

 

Quick question. Now that you're thinking GT35R, you're talking about over 500 whp correct? Do you have $10k at a minimum to spend on the turbo kit and required upgrades? If you're looking for less than 500 whp, the GT35R is overkill.

Tim