Turbo Choice

[MidWest240Collector]

Yes its one of those threads, sort of.Precision PT61 orPrecision PT52 orTurbonetics 62-1

The turbonetics is the cheapest. Still trying to decide between KA-T and RB20 and need to compare price lists. I think I can get more out of the KA-T (as you can tell with the big turbos).

[C-Kwik]

I'd have to look at the Precision turbo maps to really compare, but the 62-1 is not a very good match for a KA. At just about all boost levels, the KA barely gets up to maybe the 73% efficiency at best. But most of it looks like it will be in the mid to high 60's. The 60-1 and 62-1 are really designed to operate better with large displacements at moderate boost levels. Both of their peak efficiency islands end at around 1 bar of boost. Or, you would need to spin the KA to an astronomically high RPM(10,000RPM?) An RB20 isn't going to fair any better as it is actually smaller in displacement. If you're looking for massive power out of a small displacement motor, you need a compressor that will be efficient at high boost levels at a low relative airflow. A T04E-50 compressor would probably be my choice up to about the 2 bar of boost mark. If you are crazy enough to boost beyond 29-30 psi, then I'd probably step up to a T66. I think that's about as high a boost level as you'll be able to get on even unleaded race gas. If you are planning a race only car and will be using a more exotic higher octane fuel, then you may be able to step to about a T72 at most. That may get you into about the 3 bar of boost range before the turbo runs out of steam. Just about everything else bigger than that will surge on a KA. At least from the Garrett line of turbos. *This does not include their GT turbos.*

[MidWest240Collector]

Lol those were just possible turbos for a KA-T, not both. My friend got me thinking the other day that I could probably get a built KA-T for around the same price as a RB20 swap. Thanks for the info.