Stock base FP on a 2G is 43 psi. This is with the vacuum hose disconnected from the fpr.

Depending on mods, etc. You can go higher or lower.

Do you know what you're doing Q?

 

i have my B&M FPR set to 40psi

 

It's supposed to increase in a 1:1 ratio as boost pressure rises, I believe.

The real issue is if the base pressure FALLS OFF... that means your pump can't keep up. A normal base pressure you want to regulate when you upgrade the pump, hence an adjustable fuel pressure regulator.

 

It sounds like GReDDyGsTurbo has a 2g and set the base FP with the vacuum hose still connected to the afpr.

Base fuel pressure just means what the fuel pressure is at with NO vacuum or boost acting upon the fpr. DSM's come stock with an afpr, of sorts. It will adjust the fp based on vacuum or boost input upon the diaphragm in the fpr. You just can't adjust the base fuel pressure from stock or dial it in after the install of a big fuel pump.
Base fuel pressure shouldn't fall off. I think SeatownGST is referring to when the fuel flow will fall off at higher fuel pressures.
These higher fuel pressures are created under high boost in the afpr. This will get higher linearly with the base fuel pressure you set. So the higher you set the base fp, the more your fuel pump needs to flow at the higher pressures. Fuel pressure (psi) and fuel flow(lph/gph) are two different things.

 

Heh... I have the Wahlbro 255lph pump and 550cc injectors... I really think the car needs an aftermarket AFPR.... I'm probably gonna set it to 40 and tune from there...

 

Heh... I have the Wahlbro 255lph pump and 550cc injectors... I really think the car needs an aftermarket AFPR.... I'm probably gonna set it to 40 and tune from there...

You definetely need the AFPR...

 

lmao - I knew something was up when my MPG went to 11...