I've search for this but can't really find the right fuel pressure for my setup. Setup I have is RDX 410 and Walboro 255 with AEM fpr. Is anyone running the same setup if so what pressure are you running?

 

I would set base pressure around 50psi

 

Thanks for the reply. So is it ok to set it where stock RDX fuel pressure? Does having a 255 pump affect anything?

 

Yes, the larger fuel pump will up the pressure out of the box. From what I have gathered and read up on the spry pattern of the RDX injectors is optimum for atomization at 50psi and higher. I have seen some builds running close to 70psi with great results. The higher the pressure the larger those injectors get...to a point.

 

255 is a gigantic pump for an NA motor, but it will support higher pressure. Are you running an on-rail regulator or off?

 

So not to hijack thread, you are saying 255 is to big, should he go with 190? Im running a 255 in my all motor

 

255 is "more than enough" for all motor. It's always safe to have more fuel than be sorry because tuner can always tune it down. You never wanna run out of injectors or fuel pump during tune I guratee you.

 

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Ok, thanks. I'll set it up to 50psi base and adjust it from there.

 

38 PSI is factory for the 410cc rating. They also are rated at 550cc @70 PSI.

I have RDX injectors with a Aremotive Stealth 340lph pump. The pump doesnt matter because you have a return line and regulator. You just need a pump big enough to keep constant pressure, overkill shouldn't hurt anything...

I plan on running @ 70 psi the whole time for 550cc injectors.