On 6/8/05, David Staten <Dastaten@earthlink.net> wrote:
Is the fuel pump capable of supporting the needed pressure ABOVE the boost level? Perhaps this is a fuel pressure induced sag caused by too little "RELATIVE" pressure above the deck pressure.
Just speculation, not based on experience
Dave
Another good guess. Yes, very capable. I demonstrated that to my self back when my fuel pressure gauge was working properly they could support in excess of 80 PSI with adequate flow. During the test today I tried running just the 2nd pump, then both together. No change.
Also, worked well in the past with the other turbo pulling 38-40"MAP.
The more I think about, the detonation issue because of the advanced timing is starting to make some sense. Will go retard the timing and see what I get.