What would be the starting-point to set my adjustable fuel pressure regulator to? Also, what is the thread size for the pressure relief valve going into the fuel rail? Is it 1/4" NTP?
Fiero is an 88gt 3.1L that has been fully performance built...
Getting to the point where I will soon be firing her up for the first time (starting for the first time will be another post soon)...
Being that it is N/A I would assume that you would set it to stock fuel pressure and go from there. Heck... the LT1 350 runs the same fuel pressure as a Fiero 2.8.
Fully built doesn't tell anyone much... larger injectors? Start a little higher than stock and see what you have for BLM/INT values.
42 PSI is the base fuel pressure with the 3.1, and the stock 15 pound injectors, you may want to go a little higher 45-48 is just a guess if you have winaldl or any other data collector software - you will use that data to make fine adjustments, based on the "BLM" adjustments tryin to remember, I think 128 is the value you are shooting for. if it above 128, raise the pressure, below 128 lower the pressure. I think.
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08:53 AM
Larry Nakamura Member
Posts: 412 From: Clearlake, California, USA Registered: Jul 2003
I have an 88GT with the crate 3.4L and 17lb injectors. I set the fuel pressure to 50psi (without engine running) and when you turn the engine over it runs at approx 45psi.
