RB25 Fuel Pressure

[Darth & Vader]

Hey guys, sorry couldn't really find a straight answer to my question, so here it goes.

I know that stock fuel PSI should be about 43psi with the VAC off. My engine is pretty much stock but i have turned up the boost to about 11psi. What fuel pressure should i be running at? I have it set to 45psi with the VAC off. I just don't want to run lean..


I'm using an Aeromotive FPR w/ Gauge.


here is my setup:

My setup:

Rebuilt series 1 RB25
Stock internals
Stock turbo @ 11psi
Stock Injectors
Stock MAF
HKS Bov (not recirculated)
Greddy Intake Manifold
Walboro 255lph fuel pump
Aeromotive FPR
Z32 Fuel filter
FMIC
Stock ECU

[stamps31757]

Are you getting it tuned? If you are getting it tuned then stock fuel pressure should be plenty

[Darth & Vader]

Are you getting it tuned? If you are getting it tuned then stock fuel pressure should be plenty

No, at least not for a while.

[stamps31757]

I would just run close to stock psi. I mean you can turn up the fuel pressure but its not recommended. 7 or 8 psi is plenty until you can get it tuned for air coming in.

[Darth & Vader]

I would just run close to stock psi. I mean you can turn up the fuel pressure but its not recommended. 7 or 8 psi is plenty until you can get it tuned for air coming in.

7 or 8 psi? You mean 7 or 8 more than stock is alright? Fuel wise.

[stamps31757]

i mean lower your boost to 7 or 8.

[redline racer510]

I wouldn't boost past 10 psi just to be on the safe afr wise. Just wait till you get it tuned before turning the boost up anymore than you do now.

[eh?]

Grab a wideband.
Otherwise l doubt 11psi on the stock turbo with a little bump in fuel pressure is going to hurt the engine itself.
The turbo on the other hand...