ProchargedLT1

What does ATI consider a 15psi pulley?

KS91Z28

The same pulley may work for several different cars, so they don't call a particular pulleya "15 psi pulley". They go by the diameter of the pulley. For instance, a 3.4 pulley may make 15 psi on your car, but the same pulley may make 10 psi on a Mustang. It's all a matter of how restrictive your motor is.

ProchargedLT1

I'm talking about for an LT1 car. What size pulley would it be if you ordered a "15lb" pulley with your kit?

I know different motors will see different boost readings with the same pulley. The reason i ask is because i have a 3.4" pulley right now and i think its going to put out way more boost than i want. I'm running Stock heads with stock valves and mild porting. I'm sure i would see a large # on the guage due to my heads not flowing the best.

L8ter

KS91Z28

Is your blower actually a D1 or is it a D1SC? If it's a D1SC they would probably send you a 3.4 to make 15 psi. If it's a D1, they would prbably send you a 3.7 or something like that.

ProchargedLT1

I have a D-1.

Thanks for the replies!

KS91Z28

No problem. Sorry I couldn't narrow it down any more.