Looking over some specs on some turbos I have a question-

assuming 2 turbos have the same exhaust A/R and exhaust wheel sizes but one has a bigger compressor wheel size- how much variation will there be in spool time between the turbos?
Specifically looking at the difference between a T3/60-1 (or an SC-60) and something smaller with the same exhaust side, like a T3/T4 57 trim (like an SC-34).

Thanks
Ben

 

The boost threshhold (rpm when it starts making boost) is not going to change much, because that depends more on exhaust volume than anything else.

The lag may be slightly different, because the larger wheel has more inertia. I'd say you're looking at a small amount (~75-200 rpm?) more lag, and very little change in threshhold.

 

Thanks- that is what I reasoned out and was hoping to hear.

Ben