another post about turbo selection.

[RETed]

Originally Posted by phoenix7

is a T3 too small? Come on Ted, hook a brother up. I trust you when you say avoid it, but why?

It depends on what philosophy you believe in...

I believe in the less-backpressure-the-better group...
We try to keep the exhaust pressure versus intake pressure under 2:1 and try to shoot for a 1:1 as much as possible.
Thus, for 15psi of boost pressure, we try and keep the exhaust pressure under 30psi.
You need at least a T4 turbine side to do this.
Almost no T3 turbine side will allow for such low ratios - the Garrett GT-series GT35R's just make it.
Less backpressure -> better flow.


-Ted