What's the favorite adustable fuel pressure regulator around??
and would a gauge for in the car be just as good as putting one right on the rail???
im getting one this week so i thought i'd ask for reccomendations before i buy.
money not a huge issue but wanna keep it under $150
Thanks guys.
@d@m
Alright fellas, here's the deal:
Our cars don't have fuel pressure sensors. At no point does your mustang know what the fuel pressure is. Clear? Its a mechanical setting that the computer takes for granted as being 39.5 PSI.
What the car does know is injector pulsewidth. The car knows, from constants in the computer, what the pulsewidth should be for optimum performance according to stock components. When you mechanically adjust the fuel pressure, you have changed that constant. The computer, using adaptability algorithms, will change your injector pulsewidth to factor in the increase in fuel pressure, essentially canceling out your fuel pressure modification.
Now, on a FOX, when you go wide open throttle, the computer does not use any adaptability algorithms and the adjustable regulator can be used with great success. When you dyno tune a car, this is what is used to tune it. Nobody dyno tunes at partial throttle!
On an SN95, when you go wide open throttle, the computer STILL plays a roll in injector pulsewidth. So when you dyno tuned with the AFPR for max power, its all good, but over time, that tune is influenced by the computer.
The only reason to use an AFPR is that in some cases, installing a high pressure fuel pump, like the 255lph, will freak out the stock unit thats not built to handle it. So if you install a new pump, its worth it to make sure FP is maintained. If you find the stock unit cannot handle the 255lph, then you should buy an aftermarket adjustable unit and SET IT TO 39.5! I went through this when i put in my new pump and my stock regulator was going strong, so I didn't upgrade.
Sorry for the long post but I tried to be as clear as possible.
Adam
