Quote:
Originally Posted by oldman
Say LT headers what PSI do you see for 570 WHP and 520 HP?
|
Oh I think you could do 570 on stock headers. The issue is it won't be repeatable performance. 8psi on 93 will have the IAT's consistently up in the range(140-150) where you have to pull timing to keep knock at bay.
I personally seen it on a car that I tuned. It was a P1x, lt4 fuel system, cat deletes setup, making 600whp on 93 @ 9psi, but it has to be cold. Soon as you get out driving and the car is up to temp IAT will be pushing 140+ doing a hard pull by 5th gear in a A8 and pulling timing. I actually had to pull more timing from it after the guy bought it. It was knocking on 13 degrees of timing.
Fast forward, same car now has Heads/Cam/Headers/Rods/Piston and larger lower making 12psi. I don't have it pulling any timing on E50 until 170 degrees and it's happy. The P1x is pushing 168 degree IAT's after a hard pull. Logs indicate it's making 820whp range. On 93 it would probably be a 100-120whp less. Would definitely need meth for more octane and cooling if limited to pump gas.