Just trying to put all the parts in order for a turbo setup and was wondering at what point do an aftermarket FPR and larger volume fuel rail become necessary...

i plan on running 12psi with (675cc inlinepro injectors or 650cc RC's) and 255 Walbro pump with stage 1 inlinepro turbo tuned with a 30-1052u

.. Will the stock Fuel Rail and FPR be okay or will having these parts have any effect.. at what point will they become necessary .. 1000cc Injectors? 20+ PSI?

TIA

John

 

Stock is fine, and will not need to be ugraded till well past your 650's run out of room.

 

With an aem fpr, you'll be able to get more out of your 650cc injectors. For example, on the stock fpr, your 650cc injectors will run out at around 400 whp and you're stuck, but with an adjustable aem fpr you may be able to get closer to 425 whp or so. The reason being; you can adjust your fuel pressure to lower the duty cycle and get more out of the injectors.

I have one for sale in the forced induction area if you're interested and it bolts right up to the stock fuel rail.

 

So lowering the idle fuel pressure gives you more headroom on top? Wouldn't lowering the idle fuel pressure cause poor fuel atomization at idle and partial throttle?

 

Lowering the idle fuel pressure will help to not have the fuel pump run out but you dont want to get it too low for idle. Typically no lower than say 32 psi at idle. This will also raise the duty cycle from what I understand but will give you more headroom on the fuel pump. Now, if your fuel pump/pumps can support it, raising your fuel pressure at idle will allow the injectors to be able to support more power and it will lower the duty cycle.