Quick question for you guys. Does anyone know what the stock fuel pressure a 04 evo 8 is. Thanks a bunch.

 

Approx 38.5 psi base pressure with the vacuum line disconnected from the FPR at idle. If you are adding an adjustable FPR, most guys set it at 43-43.5 psi base pressure at idle with the vacuum line disconnected.

Josh

 

Thanks a bunch man!!

 

no problem, I just added an adjustable FPR to my setup and wondered the same thing when I was setting it up.

Josh

 

No trying to hijack the thread, but when would a FPR be necessary over a stock one?

 

Question do u add the vac line back on after u set the psi u want ?

 

The original answer post was wrong. Base pressure for the 04 Evo 8 is 43.5. You set the adjustable FPR to 43.5 while vacuum hose is disconnected. Then you reattach the hose, and it should drop the gauge down to approx 39 psi. Just an FYI.

 

Thanks man