#1077, "RE: stock FPR on 1995" In response to Reply # 0
With the vacuum hose on the stock regulator diconnected, your minimum fuel pressure should be 47-50 psi. The adjustable FMU should only raise fuel pressure from that point. If you leave your stock regulator vacuum hose connected, it will vary your minimum fuel pressure from 38 to 47-50 psi depending on how much vacuum it sees. Then the FMU would be trying to vary the pressure at the same time. Save yourself some tuning headaches and disconnect the vacuum hose to the stock regulator. If you're really concerned about the stock regulator. Take it off and examine it. Maybe you can tear its guts out and keep it from regulating anything . Its only held on with a snap-ring .
#1078, "RE: stock FPR on 1995" In response to Reply # 1
Would there be a problem if we ran the car with a minimum fuel pressure of 47 psi? What would happen? End up running a bit rich when there is alot of vacuum?
#1082, "vacuum/boost source for FMU" In response to Reply # 1
Since my stock FPR will cause my min fuel pressure to be at 47-50psi, I don't see the need to plug a vacuum souce into the adj FMU (since it won't be able to lower the pressure).
So should I still use the intake manifold as the vacuum/boost source, or could I run it directly off of the turbo? I remember that if the FMU is hooked into the turbo, we get less of a "reg lag..."
#1083, "RE: vacuum/boost source for FMU" In response to Reply # 6
I would just hook the FMU up to the manifold. I'd figure the manifold pressure is the most important one. Its after the pressure loss in the IC/piping, after the BOV, and after the throttle plate. Thats the air thats actually going into the engine. I don't recall ever having a problem with the FPR reacting too slow.
I'm not sure what this is an indication of, but I actually can make my fuel pressure dip pretty low <~40 psi>. I'm not sure if my fuel pressure gage is reading low or something else is going on. I shouldn't be able to get it that low...assuming that the stock regulator works like I think it does. When I get my car back, I'm going to remove my stock regulator and check it out . I'll check my fuel pressure gage too. I'm also really considering an AFC and injectors. I've got so many plans for the coming weeks...I'm dying to get my car back.