|
|
|
|
Thread Tools | Display Modes |
12-20-2013, 11:11 PM | #1 |
Scooby Newbie
Member#: 375748
Join Date: Dec 2013
Location: 27PSI
Vehicle:04 STi |
Walbro 255L, Fuel Pressure SOLVED!
EJ207 JDM/AUS, 04 STi / FPRed @21 PSI / 90% IDC / DW1000cc / 55ft / 83mm MAF /3in inltet / walbro 255 / rails etc...
Ive been trying to figure out what is happening with the fuel press. There is no leaks anywhere i have triple checked. What happens is, start the car ,255l walbro primes / cold start = 3.2bar (46PSI) / Warm idle = 2.7bar (39PSI) / WOT = 3.8bar (55PSI) i know these are all lower than normal but am stumped why? Fuel Pressure SOLVED! see post #9 -1MOFO
* Registered users of the site do not see these ads.
Last edited by 1MOFOSTI; 12-28-2013 at 11:08 PM. |
12-21-2013, 03:12 AM | #2 |
Scooby Newbie
Member#: 375748
Join Date: Dec 2013
Location: 27PSI
Vehicle:04 STi |
Bump for the 4 PSI of pressure i'm missing.
|
12-21-2013, 04:58 AM | #3 |
Scooby Guru
Member#: 158864
Join Date: Sep 2007
Location: Aussieland
Vehicle:2003 SOHC destroker |
i'd say it's your fuel pressure reg/ecu/fuel relay rather than the pump. the pump itself doesn't control how long it remains on for.
tried a different pump to make sure it's not faulty? process of elimination... |
12-21-2013, 06:50 AM | #4 |
Scooby Guru
Member#: 32792
Join Date: Feb 2003
Chapter/Region:
NESIC
Location: lincoln, ri
Vehicle:2003 GGA MBP 12.9 / 105+ |
what does the fuel rail pressure read with the FPR manifold reference disconnected?
|
12-21-2013, 09:44 AM | #5 | ||
Scooby Newbie
Member#: 375748
Join Date: Dec 2013
Location: 27PSI
Vehicle:04 STi |
Quote:
Whats the best way to test the relay and is there a way that i can test the FPR's while its on the car? Im running twin OEM FPR per rail setup, (at the end of each billet rail sits a OEM FPR.) I also disconnected the relay so that there is no pressure and reconnected it to see if it builds up properly but still reads 4 PSI under base. Quote:
Do you mean disconnect the manifold reference vac lines to each FPR (as im running the twin setup) and read what pressure it's getting? Last edited by 1MOFOSTI; 12-21-2013 at 10:07 AM. |
||
12-21-2013, 02:06 PM | #6 | |
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:2002 WRX Sedan Midnight Black |
Quote:
If your pump is hard-wired, you can simulate this by letting it run for 5-10 secs, then pulling the fuse. What does fuel pressure do? How fast does it decay after prime (should bump up to ~43-44 psi and take a long time to decay. Barely noticeable decay unless you go away and come back 30+ minutes later.) |
|
12-22-2013, 12:10 AM | #7 | |
Scooby Newbie
Member#: 375748
Join Date: Dec 2013
Location: 27PSI
Vehicle:04 STi |
Quote:
Just tested see below: - Ignition on / fuel pump prime = 3.3 BAR ( 47.8 PSI ) - Once its stopped priming = 2.9 -3.0BAR ( 42 - 43.5 PSI ) It holds 42-43PSI for 1min From there every 3 - 4mins it drops - 2PSI |
|
12-23-2013, 03:13 AM | #8 |
Scooby Newbie
Member#: 375748
Join Date: Dec 2013
Location: 27PSI
Vehicle:04 STi |
Someone must have see this before?
|
12-28-2013, 11:45 AM | #9 |
Scooby Newbie
Member#: 375748
Join Date: Dec 2013
Location: 27PSI
Vehicle:04 STi |
Guys problem solved.
I was under the impression that it had to be 43.5 PSI or above with the manifold pressure reference connected. Turns out it's with it disconnected and here's my test results. (i actually have more than i need lol.) Vac disconnected from FPR : 3.3BAR ( 47.8 PSI ) Vac connected to FPR : 2.7 ( 39PSI ) |
12-28-2013, 01:05 PM | #10 |
Scooby Guru
Member#: 158864
Join Date: Sep 2007
Location: Aussieland
Vehicle:2003 SOHC destroker |
ahhh. yes always set base pressure with atmospheric. best outcome possible really!
|
12-28-2013, 10:05 PM | #11 |
Scooby Newbie
Member#: 375748
Join Date: Dec 2013
Location: 27PSI
Vehicle:04 STi |
|
Thread Tools | |
Display Modes | |
|
|