Matt Weiser
It's an F.U.V.
- Joined
- Dec 17, 2001
I recently installed an AFPR and trying to get comfortable tuning with it. What I'm wondering is, how does fuel pressure affect mpg?
I'm assuming that as fuel pressure increases, mpg will drop because you're injecting more fuel per piston stroke, all else being equal. Is that right, or am I way off base?
In either case, somebody set me straight, eh?
Right now I'm running 42 psi fuel pressure, 14# boost, on 89 octane gas, JL 93 octane chip. I have no knock at WOT but just a bit of KR during the transition to boost (say, while cruising). I realize I might be stretching things a bit with this chip and the octane I'm running, but the car is a daily driver and I'm looking for a good power/mpg compromise while using gas that's a bit more affordable. So call me crazy.
Any and all feedback appreciated.
I'm assuming that as fuel pressure increases, mpg will drop because you're injecting more fuel per piston stroke, all else being equal. Is that right, or am I way off base?
In either case, somebody set me straight, eh?
Right now I'm running 42 psi fuel pressure, 14# boost, on 89 octane gas, JL 93 octane chip. I have no knock at WOT but just a bit of KR during the transition to boost (say, while cruising). I realize I might be stretching things a bit with this chip and the octane I'm running, but the car is a daily driver and I'm looking for a good power/mpg compromise while using gas that's a bit more affordable. So call me crazy.
Any and all feedback appreciated.