I would like to run a D1 on low boost application (5.0 psi on STOCK LS7). Right Now I am using a P1SC (5.0 psi) and it is doing a GREAT job except after 6400 rpm there is a significant nose over in power.

My question is how do y'all think the D1SC will operate at such low boost (although on an LS7)? Would I lose enough efficiency that I am better of just sticking with the P1SC-1?

My understanding is the the D1SC is very inefficient at low boost levels? Anyone disagree?

D1SC would spin at 45,000 RPM.

 

What cam are you running?

Jim

 

I have Headers (Kooks) and a very, very mild cam. Very close to the factory LS7 cam.

 

I ask because I'm wondering whether your noseover is due to your cam or your blower.

Do you have your P1 pullied so that it hits max rpm ever?

Just in case you need to figure it out, here's the blower rpm equation:

Lower pulley diameter X max engine rpm X blower internal gear
__________________________________________________ ___
Blower Pulley Diameter

Jim

 

Got it. Thanks. I am pretty sure nose over is because of head unit.

 

I tend to agree because it's such a large motor. Have you maxed out the P1 rpm or is there more still there to tap?

I could only ever get 7.2# out of my S-trim Vortech on a FMIC 383, and I know it was hitting max rpm for the blower at around 6250, which is exactly where my power nosed over.

Jim

 

There is still 10,000 RPMs on tap but I think I am still out of efficiency with it. I am well over the CFM the unit is advertised for. Thanks for the input.

 

Down low I expect the D1 to perform in a similar range to the P1. Procharger won't post efficiency maps for their blowers so it's hard to say how they are doing and where.

Jim