I have plotted my (using these formulas) corrected air flow (29.4 lb/minute) and my pressure ratio (2.02) on some compressor maps.. On a t04e 60 trim it falls at about 75% compressor efficiency.

I understand all that, but I am left with choosing an exhaust housing. What does a/r mean? ie .82 a/r on this turbo. (GARRETT T3/TO4E 60 TRIM W/ .82 A/R TURBINE) I could use some clarification on:

trim ex. 60, 57 54 - I figure that the high number is bigger, some more detail would be great, and:

A/R HOUSING ex. .63, .82 and - I know .82 will take longer to spool, and .63 will spool sooner, but at what point does it become a restriction?

the stage X wheel. ex. stage 3 wheel. I guess a stage 5 will flow more air than a 3 correct? At what cost? Slower spool time?


TIA, and I have been and still am searching BTW, the engine is a 2.8l vr6.


Modified by plohip2 at 10:41 PM 11/25/2003

 

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