ok..here is what i am saying...not all turbos are created equal...everyone has different characteristics....for example...t3/t4...top end out the ass...cus it has a higher CFM, 16g...spools faster, excellent street turbo, but high boost levels say...25 lbs, it will die off in the upper RPMS. T25: pile of shit! just witnessed my friends blown t25 on his GST...not a pretty site.

Another difference in turbo's is the temperature of the air that they put out, higher the CFM, generally, the lower the temperature of air at that boost level...for instance, a t25 at 10 PSI will be way hotter than a 16g at 10 PSI..that is how a 16g makes more power.

And yet another difference is spooling characteristics...but i think we all know basically about those..

This is what i mean though... 10 PSI in your intake manifold at a given RPM and at the same air temperature, will make the same amount of power...regardless of what turbo it is... where different turbo's make different HP levels, is if the boost falls off, or if at a higher RPM, the air gets heated more by the turbo, and not cooled off enough by the intercooler...that is how different turbos can make different HP levels at the same PSI. so...i guess i am contradicting what i am saying earlier...but the way i see it, if you have an intercooler that can cool your intake charge to low temps...and a turbo that can hold the same amount of boost to redline...then it shouldn't make too much of a difference what turbo you are running...it's in the low end for spooling is where you should be concerned.


jason
95 GS turbo