ausubaru92 Posted December 19, 2007 Share Posted December 19, 2007 I have an 89 vortex motor in my wagon. I noticed that it surges and loses power as it nears 5k rpm so i bought a narrowband Air fuel ratio gauge. As i accelerate, it goes from rich and 3k rpm to full lean by about 4-4.5k rpm, (i wasnt game to rev it any more) So i hooked up a fuel pressure gauge and noticed that at idle i had like 38psi and at cruise i had about 42psi. but on boost i have only 46psi. Thats says to me that the fuel pressure cant keep up, as boost pressure raised by 7psi but the fuel pressure only raised by 4psi. Anybody had a similar problem? Quote Link to comment Share on other sites More sharing options...
ausubaru92 Posted December 20, 2007 Author Share Posted December 20, 2007 My fuel pump started making grinding noises the other day so ive bought a new pump Will see how i go Quote Link to comment Share on other sites More sharing options...
Gloyale Posted December 23, 2007 Share Posted December 23, 2007 Bump for an update Quote Link to comment Share on other sites More sharing options...
ausubaru92 Posted December 23, 2007 Author Share Posted December 23, 2007 Replaced pump, still runs like crap and still makes noises. So i swapped the Fuel pressure regulator and driveability is back. Not perfect so i tested fuel pressures and they are better, but im gonna get a malpassi ajustable 1:1 and use that. The rubber diaphram in the stock one must go hard Quote Link to comment Share on other sites More sharing options...
john in KY Posted December 23, 2007 Share Posted December 23, 2007 Think you would be happier with a rising rate regulator like 1:1.5. Easy/cheap way to boost pressure is to just restrict the return line with a hose clamp. Quote Link to comment Share on other sites More sharing options...
carfreak85 Posted December 24, 2007 Share Posted December 24, 2007 Make sure you post pics of the FPR when its installed. I need something to go off of for my wagon. Quote Link to comment Share on other sites More sharing options...
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