Originally Posted by Lunatic250
I just bought a dieseloring.com fpr housing ( Fuel Pressure Relief housing - Billet Aluminum w/pressure shim springs
) and was wondering what is the ideal pressure for a stock truck? all i really have done is a custom tune and an 6637 intake for now but read about ppl suggestion diffrent pressures at all times. This kit comes with 3 springs to adjust press. 58-61 psi silver spring (Stock pressure)62-65 psi gold spring,67-70 psi black spring. I have always read about ppl shimming the fpr which is why im wondering now how much is good and how much is bad? im interested in a little more performance but dont really want to kill my mpg either.
Fuel pressure on a 7.3 has little if anything to do with performance. So long as you can refill the injector before the next injection event you will gain nothing.
Every truck, every injector has a sweet spot for fuel pressure, when I ran stock injectors I kept it at 74psi or so, with the stage 2's it was 65psi and the hybrids I have now are 62psi....
Otherwise as was said before, above 50 psi and your not hurting the injectors, above 75 your just working the pump hard.