Is 47 For Fuel Pressure to high

withamc · 05-30-2001, 12:44 AM

"Fuel pressure has nothing to do with the air/fuel ratio. These are computer controlled vehicles. The computer will only deliver as much fuel as needed."
Speaking from experience, I can tell you that is not true. I had my car on the dyno - 24# injectors and the other stuff in my sig - at 39 PSI (vacuum off) I was putting out 243 HP at the wheels and running rich at WOT. Dropped the fuel pressure to 33 PSI and the car had the proper A/F ratio and put 277 HP to the wheels. At WOT the computer ignores the O2 sensors. That's why we use adjustable regulators.
It doesn't look like pete1 is going to be putting out the kind of HP I am, so yes he should try dropping his fuel pressure to 30 PSI.

------------------
86 GT, CCM long block, GT40P heads, Crane 2031, 1.7 RR's, Cobra intake, 65mm TB, 73mm Vortech, 24# injectors, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, Groundpounder subs and lower control arms, 277 RWHP.
93 GT - Moroso cold air, 3.55 gears, ?? shifter, Black Magic fan, soon to get the engine and other goodies from the 86

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05-30-2001, 12:44 AM	#8
withamc Registered Member Join Date: Aug 2000 Location: Thousand Oaks, CA Posts: 396	"Fuel pressure has nothing to do with the air/fuel ratio. These are computer controlled vehicles. The computer will only deliver as much fuel as needed." Speaking from experience, I can tell you that is not true. I had my car on the dyno - 24# injectors and the other stuff in my sig - at 39 PSI (vacuum off) I was putting out 243 HP at the wheels and running rich at WOT. Dropped the fuel pressure to 33 PSI and the car had the proper A/F ratio and put 277 HP to the wheels. At WOT the computer ignores the O2 sensors. That's why we use adjustable regulators. It doesn't look like pete1 is going to be putting out the kind of HP I am, so yes he should try dropping his fuel pressure to 30 PSI. ------------------ 86 GT, CCM long block, GT40P heads, Crane 2031, 1.7 RR's, Cobra intake, 65mm TB, 73mm Vortech, 24# injectors, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, Groundpounder subs and lower control arms, 277 RWHP. 93 GT - Moroso cold air, 3.55 gears, ?? shifter, Black Magic fan, soon to get the engine and other goodies from the 86