I still CANNOT get over 80 psi of FP when boosting 7 -8 psi. I pulled the plugs yesterday (brand new bkr7e's @ .031) and the first cylinder is just barely white.

I have the largest disc/no ring/dark spring/stock injectors combo in and I'm getting annoyed. I have 47psi at idle which is great but it only seems to raise to 80 which is only 4.7 psi raise in pressure per psi of boost.

I don't want to bag on the car till this is figured out and I recieve my techedge and EGT gauge But I'd like to be able to drive is fairly lively

My return line from the sfmu is stock, diapragm is new, sfmu is installed correctly. boost screw is in, vacume screw is out about 2 turns. Grrr.

I don't know what to do about the vacume screw. It seemed that before, It was screwed all the way in and it wouoldn't even reach 80 psi. I then backed it out a bit and got to the 80 but now unscrewing it more doesn't yield any diff. results.

And yes I've searched. I'ev read EVERY SFMU post possible. My eyes are bleeding.

Owww.

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

come on peeps.

I know this topic is getting old.

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

That sounds definately like a fuel pump issue. I take it it's of course upgraded over stock, probably a wal-bro 255. The pump may be going bad, the voltage might not be high enough (re-wire it like me), the MFI relay could be bad. You could also have a bad/clogged fuel filter, change that too.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

you got a good vac signal to your SFMU?

getty up

-kent-




'98 Talon...gone, but not forgotten

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

getty up

-kent-




'98 Talon...gone, but not forgotten

Originally posted by micyek
well neenee neenee...look at me my name is Blair I'm so smart

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

Yeah, I would get those relays switched out and that fuel filter ASAP. If that alone doesn't let you build over 100 psi, do the pump rewire "mod".

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

Okay, got the fuel filter changed.....No difference in FP. I didn't change the relays but did rewire the fuel pump and still no change.

Does anyone's walbro have the normal "Hummmmmmmm" noise but then they step on the gas and then it goes away.......did that make sense?

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

my Walbro sounds like a dentist tool does at low rpm while priming... if that makes any sense. While driving, it sounds like a dentist tool at high rpm, and under throttle it sounds just like it does at idle... since if I remember right, your fp is always outputting the same pressure no matter what kind of driving you are doing.

1995 Eagle Talon ESi

At low RPM it has to FLOW a lot when the fuel pressure is low (because nothing is restricting the circuit, the pump is flowing at full blast), and that's why it's the loudest when there is no load.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

1995 Eagle Talon ESi

I eat emo kids for breakfast

1995 Eagle Talon (SOLD)
72' SuperBeetle
72' Standard Beetle
56' Deluxe Beetle

maybe your injectors are shot? idk i'm definetly not the expert, but just throwin stuff out there since you seem very stumped. Good luck figuring it out

I contributed to the Wiki!
EVO IX - just a really expensive boost gauge and a K&N air filter
96 Eclipse RS -awaiting registration and inspection
95 Eclipse GS - parts car
Mods/Profile - http://www.2gnt.com/index.php?d=cs82685