I am installing a AFPR tomorrow. I have installed 24lb injectors and M/A to match. I have GT40 heads & Intake 65mm TB 76mm M/A 1.7 ratio Crane RR 110l/hr Fuel Pump What pressure should I adjust it to?
Posted by: Adrenalin
The best answer would be from a dyno tune. Anything else would be just by the S.W.A.G. method. I know it's not the answer you wanted to hear but by far, the most accurate.
Posted by: maverick2010
Quote:
Originally Posted by Adrenalin
The best answer would be from a dyno tune. Anything else would be just by the S.W.A.G. method. I know it's not the answer you wanted to hear but by far, the most accurate.
A guess to get me started would help.
Posted by: Grape Ape
The best thing to do is retain the factory FPR and move on. If you're now in a position to adjust one, try around 42psi and see how that works. Way back when, it seemed nearly everyone I knew was changing to an adjustable regulator... Most had issues as a result... I left the factory version on my car until I went to the 408. It worked wonderfully for me, allowing me to use nitrous at will and retain full drivability without the added hassle of one more thing to tinker with. With my setup, the pressure would jump to around 100 when the juice was on, but I never had to change a thing to make it happen because the MAF, etc. did their thing and bumped pressure automatically.
Posted by: maverick2010
Thank you
Posted by: VETTKLR
10-4....42psi is stock presssure with the vacuum line unplugged from the FPR, if I recall correctly
Posted by: Grape Ape
That's what I remember too and that's exactly why I suggested starting there. I was hesitant to say so, but after a moment, I was pretty sure so I went with it.
Posted by: VETTKLR
stock settings were a lonnnng time ago, eh Rob
Posted by: Grape Ape
Kinda, but as I mentioned before, with all the trouble others were having, I left my stock regulator installed till I ousted the 308 in 1999. Once I went stroker, I took the cheap way out and used a carburetor instead of injection. I prefer injection over the carb, but the system I needed was roughly four thousand dollars at the time, so I figured buying a 1,000 dollar "simpleton setup" was the way to go. Problem with carbs is simple... If you can't properly set that up, you've got real concerns which simply aren't as prevolent with EFI and a good fuel management system.
That said, it's been more than 7yrs since my car was an EFI brute. I miss that aspect greatly, knowing I can't just hop in and drive it now as I did before. Starting isn't a big deal... economy is.
