Fuel Pressure???

[Blaster]

I'm not sure what to run for psi (zero vacuum) on my car. It makes 375-385HP at the flywheel but I have a custom burnt chip. I never took an inital reading before I started fooling with the pressure to solve other power adder problems (very stupid). The fuel pressure analyzer says to run 50 psi (I have 24 lb/hr injectors) the car is at 40 psi (zero vacuum) right now. If I went to 50 psi would my custom chip just regulate the psi anyways if I was a little high, I don't want to be lean and I don't have to worry about the N2O becuase it's a wet kit. I just can't get back to the dyno anytime soon.

[USMC302]

The chip won't affect the pressure, it will control the impedence of the injectors firing the fuel (hope I said the right) anyway, the best way to know what fuel pressure you need to run for your setup is to run it at the track and adjust from there, I would start at 32psi or so and go up from there, watch your mph, not your et. Once mph starts to drop stop adjusting. I would adjust in 2 or 3 psi increments. Ever thought about investing in a wideband? Would work wonders for tuning!

[Dark_5.0]

Originally Posted by USMC302

The chip won't affect the pressure, it will control the impedence of the injectors firing the fuel (hope I said the right) anyway, the best way to know what fuel pressure you need to run for your setup is to run it at the track and adjust from there, I would start at 32psi or so and go up from there, watch your mph, not your et. Once mph starts to drop stop adjusting. I would adjust in 2 or 3 psi increments. Ever thought about investing in a wideband? Would work wonders for tuning!

He covered it from top to bottom and is 100% correct.

[scrappy5.0]

I just put on gt40p heads gt40p lower and upper intake on my H/O 5.0 the car will turn over and start for about 3 seconds. i pushed the valve on the fuel rail lines to see if i had any fuel pressure and there was no pressure. any one got an idea...im new to working on cars so bare with me