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View Full Version : Fuel pressure under boost??? Help please....



FastAOD
04-25-2004, 08:17 PM
Did some R&R today over at Duffee's. wich consisted of A/F, meter V, Air intake temp, monitering, and testing my new water injection system...

With this new Pro-M 92mm meter, @5000 rpm, my meter saw 3.9 volts...Cool! but A/F was about 12:1 @ 5000rpm, so we richened up the top end and left it at about 10.3:1, but just over 5500rpm she started to lean out, so we went back and added more fuel, but no changes to t he A/F, so we new somthing was up with the fuel delivery...

I use the Aeromotive injected bypass reg, and i cant figure out a fuel ramping issue...under full boost (15psi) it might ramp it like 4-5 psi....with the vacumm line hooked up to it, it should increase FP by a 1:1 ratio to boost...

We hooked up the shops mechanical one, and went for some runs down the street, and it still didnt ramp pressure so i know its not my electric gauge..

I hooked up a vacum pump to the reg, and saw that the screw on top leaked air pretty bad, so i took it out, and used some silicone, now it holds tight, i was testing it at like 20psi....

Car idles at different pressures also it seems, somtimes its 32 and somtimes its like 38....?? Weird, but there is definatly somthing going on...

Any help appreciated, Thanks again
MIles

RdRunnr
04-25-2004, 09:09 PM
What's the rest of the fuel system consist of and what pump are you running?

FastAOD
04-26-2004, 07:52 AM
Aero1000 pump
Aero filter
Grannatelli fuel insert
-10 from tank to pump
-08 from pump to rails (feed)
-06 from rails to pump (return)
#42's


Thanks again....