[The Forbidden Supra]

I have dual walbo hp fuel pumps, dual -6 feeds, 720cc injectors, sp rail, and I plan to run up to about 750rwhp or so. Where do you think I should set my static fuel pressure? Right now it's at 45 psi when the motor is off, and about 38 psi with it on. Think I should turn it up 5 psi? Thanks.

-Paul

 

[Mad TKD]

the static psi should be set at 43-45. Static pressure is car running but hose pulled from the FPR or car not running but key turned to the on position with the hose on. Good Luck

 

[The Forbidden Supra]

Only 45 psi? Some people are running a lot more than that I know. I'm only using 720cc injectors, not 850-880cc. You don't think it's necessary? Or is there a reason not to run higher? I just want to decide before I start tuning. Thanks.

 

[Mad TKD]

I heard u can tune to what ever FP you can but I have 1000cc injectors on a sp71gtq turbo tuned at 43 psi. You might want to call larry at SP

 

[Ryan23]

Paul, your FP is fine. You are seeing 38 with it running because it's pulling a vaccum on your FP regulator. With the hose pulled, 45 PSI is good. Running too high a static FP is not good on injectors. You may be able to eek out a little more power by running the higher pressure, but you are still running on the ragged edge to achieve that on 720's. Keep an eye on FP and if you start leaning out up top, step up to 850's. Better to just start with the 850's if that's your goal, but everyone's md path is a little different with respect to $$.

Ryan

 

[Sound Performance]

Aren't you running an AEM now Paul???


You ask some of the goofiest questions BTW !!


If you have an AEM, you can tune it for any fuel pressure although ideally you should keep your static pressure between 35 and 50. 43-45 is where we set them!



Larry
SP

 

[The Forbidden Supra]

Thanks guys. LOL, yeah I do ask some silly questions sometimes, but I just like to double-check things once in awhile. I guess I'll just leave it at 45 psi then! Yep, I'm running an AEM now, it rocks!