NZ_87_TURBO

Should i put the fpr solenoid back in so that my aftermarket frp see's 0 vac at idle? ( thats how they work aye?)

or should i just adjust it to 34psi with the vacum line off the reg so that at 0 Vac it sees 34psi and at -16-20 Hgmm ( vac ) it will read about 20psi of fuel pressure?

i ask this as i set the pressure to 34psi with the vac hose on at idle and i am chewing thru the gas like nobodys business.

so i want to know, have i now set my FPR right ( vac hose off at idle)?
if not, how do i do it?

HAILERS

99 percent of the time the stock FPR routes intake manifold pressure/vacuum to the FPR. On RARE occasions the FPR solenoid closes off and lets the FPR see atmospheric pressure. An example is during HOT starts.

A normal stock FPR will show approx 28-32psi at idle after the car is fully warmed up. At atmospheric pressure at idle it would be closer to 37-39psi. The pressure will rise approx one psi for each psi of boost pressure. So boosting 10psi will result in a fuel rail pressure of 49 psi approx.

That FPR solenoid RARELY closes off. Normally the FPR is seeing manifold pressure all the time.

NZ_87_TURBO

so i should have my FPR set to 28-32PSI with the vacum hose connected? and thats the fuel pressure is what i should see at idle?

HAILERS

At idle and the vacuum hose connected? YES. Frankly I see, at a 750rpm idle, about 32psi. Used engine I suppose. If at idle and I pull the vacuum line off the FPR and plug that line while idling, I see approx 38psi (seeing atmospheric pressure).

While boosting the fuel rail pressure will rise and I'll see approx 49psi fuel rail pressure (fuel pressure gauge tied to the wipers...wheeee!). I gotta buy a fuel pressure gauge that I can put in the car ....someday.

I know close to zip about aftermarket FPR's.

NZ_87_TURBO

na thats all i needed to know.
Im currently trying to track down some sort of electronic sender unit that i can plumb into my fuel line and hook upto a gauge that i can mount in the car. Im cheaping it out ya see and running a rising rate reg to up the amount of gas in putting thru the injectors when im on full boost. once i get a safc i'll switch it back to a 1:1 and save some $ on gas.