#90439, "has anyone successfully lowered fuel pressure on 95 system?"
i have 30# injectors and cant lower fuel pressure below 20ish.... im planning on putting in 400cc soon, but im concerned i wont be able to get it to idle right.... i have a stock 95 return line and sfmu... i was wondering how many people have gotten the 95 system pressure lower than 20... i just want to see if i should install a larger return line or if i have a problem somewhere else...thanks doug
14b custom turbo kit, modified starion front mount, 9.6:1 JE pistons/Eagle rods....running 12psi screw flanders
#90440, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 0
its more likely he SFMU limiting you, not the return line.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#90441, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 1 Oct-07-05 08:43 AM by thedawg
20psi idle on 30# injectors is pretty low, fuel mixture wise.
And actually, I'd be more worried about the atomization at that pressure, rather than the SFMU or return line restrictions. My car would sputter and die under ~18psi idle on my Ford 42lb'rs (and RC 440's).
#90444, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 2
I have ford/bosch 440's and it idles fine, even at 12psi. Sometimes I see 12psi, usually between 15-18. You'll probably idle fine at 20psi, but I'd be willing to bet you will be able to get lower pressures when you install the 400s.
#90451, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 3 Oct-07-05 11:46 AM by WickedESi
I can lower my fuel pressure to 10 psi (and the car idle fine) on my stock 95 lines w/ sfmu. Did you change the inlet fitting to the sfmu? did you shave off the taper on it if you did?
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician
#90452, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 4
no, ive never heard of shaving it off? im not sure what youre talking about either... so the stock return line is fine, its got to be something before that limiting me correct?...thanks doug
14b custom turbo kit, modified starion front mount, 9.6:1 JE pistons/Eagle rods....running 12psi screw flanders
#90455, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 6
Originally posted by lickscissors no, ive never heard of shaving it off? im not sure what youre talking about either... so the stock return line is fine, its got to be something before that limiting me correct?...thanks doug
If you didn't change the inlet fitting don't worry about it. If you ever take it off you'll see what am talking about. They seal using a o-ring, not the AN flare (which would restrict flow in it's design).
Originally posted by sike injectors? i believe bigger injectors dump more of the pressure.
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician
#90510, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 7
Originally posted by WickedESi If you didn't change the inlet fitting don't worry about it. If you ever take it off you'll see what am talking about. They seal using a o-ring, not the AN flare (which would restrict flow in it's design).
That's interesting... I did replace my inlet fitting (sfmu from ebay) and I'm not sure if it was o-ringed or flared now that I think about it. So that may be why i was limited to 18psi minimum at idle.
#90511, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 8
It might just be the spring and disk combination you have chosen that is limiting your minimum fuel pressure. When messing around with different disks and springs, I noticed that I was limited on my max and min idle fuel pressures depending on what combination I chose.
Corbin
'95 ESI-T Now with more power and fewer leaks
Gimme fuel...Gimme fire...Gimme that which I desire
#90515, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 8
Originally posted by thedawg
Originally posted by WickedESi If you didn't change the inlet fitting don't worry about it. If you ever take it off you'll see what am talking about. They seal using a o-ring, not the AN flare (which would restrict flow in it's design).
That's interesting... I did replace my inlet fitting (sfmu from ebay) and I'm not sure if it was o-ringed or flared now that I think about it. So that may be why i was limited to 18psi minimum at idle.
For further detail, the fitting that comes with the sfmu is a -6 male FLARED fitting, with the flare CUT OFF. It seals using a nitrile oring placed over the fitting. It is a definate restriction if you don't cut the flare off before screwing it into the SFMU.
Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician
#90516, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 10
I thought they were just -6 to 1/4" NPT straight thread fittings with an O-ring.
______________________________ If a sentence found online has 35% misspellings or greater and includes at least two racially charged expletives, chances are it is a YouTube comment.
'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#90517, "RE: has anyone successfully lowered fuel pressure on 95 system?" In response to Reply # 10
Originally posted by WickedESi
Originally posted by thedawg
Originally posted by WickedESi If you didn't change the inlet fitting don't worry about it. If you ever take it off you'll see what am talking about. They seal using a o-ring, not the AN flare (which would restrict flow in it's design).
That's interesting... I did replace my inlet fitting (sfmu from ebay) and I'm not sure if it was o-ringed or flared now that I think about it. So that may be why i was limited to 18psi minimum at idle.
For further detail, the fitting that comes with the sfmu is a -6 male FLARED fitting, with the flare CUT OFF. It seals using a nitrile oring placed over the fitting. It is a definate restriction if you don't cut the flare off before screwing it into the SFMU.
Clarification: It could only be a restriction on the return line. Its a -6AN port fitting. Thats what I use. With the rubber o-ring.
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