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LPFP PSI Exceeding 72PSI. Halp Pls.
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03-08-2014, 07:48 PM | #23 | |
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This is an odd problem. Looking at the logs I would say that the voltage regulation is working but it is possibly offset. I'm wondering if it is not your vvc(variable voltage control) is staying above 3 at no load. The pump adjusts output based on the voltage received. If your fuel pump control module is faulty it could think it is giving minimum voltage but it is running higher. I would confirm voltage to the pump at idle is ~3V. If that is the case I would try examining your fuel filter and pressure regulator as that is the only option left.
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07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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03-08-2014, 07:56 PM | #24 | |
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OK here's a dumb question- how do I measure voltage at the pump? I'm a complete electronics noob. I'm starting to think this pump just doesn't play nice in my car, for whatever reason. Probably going to try a 255 traditional inline setup. I have a hard time believing the regulator just failed out of the blue.
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03-08-2014, 08:10 PM | #25 | |
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07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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03-08-2014, 08:17 PM | #26 | |
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Thanks for the help
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03-12-2014, 07:18 PM | #28 |
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I have a feeling the same thing will happen to me. Good thing this pump was a good value buy. Oh wait, not in the least.
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03-14-2014, 10:39 AM | #29 |
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OK so here is where things currently stand. I’ve added in a 3D scalar to account for E60, that has alleviated the problem in all situations except one. When idling, starting, cruising, or even giving a good amount of load, the car is fine and hits low 70s PSI without issue.
However- when I go WOT or give it a lot of load, fuel pressure does not return to its requested PSI and stays in the high 80s. If I pull over and re-start the car, it returns to normal. It is very, very odd behavior and I cannot explain it. I’ve attached logs that display what I’m talking about. SteveAZ’s pump should come in today so if it’s warm out, I may swap pumps over the weekend to see if that remedies it. http://datazap.me/u/135pats/e55?log=0&data=1-20-21
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03-14-2014, 10:57 AM | #30 | |
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03-14-2014, 11:16 AM | #31 | |
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03-14-2014, 11:34 AM | #32 | |
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03-14-2014, 11:39 AM | #33 | |
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Did you ever get the chance to check voltages?
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07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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03-14-2014, 11:55 AM | #34 | |
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Have not…I need to buy a multi-meter for sure. It's just odd to me that it can properly regulate LPFP PSI just fine, until you let off WOT or near WOT. Then it loses all ability to regulate it until the car is restarted. Bizarre...
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03-14-2014, 12:04 PM | #35 | |
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01 Control unit for fuel pump 1 09/2008 16147229173 $270.47
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07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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03-14-2014, 12:08 PM | #36 | |
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Thanks for the part number that is extremely helpful. I still think that fundamentally, this is an issue with the pump and not the peripheral parts. So my next step is going to be to swap in SteveAZ's 255 setup and see how the car likes it. When all is said and done, i'll be nearly $2K dumped into the damn car just to run E60. That sucks but it's a sunk cost.
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03-14-2014, 12:27 PM | #37 | |
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07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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03-14-2014, 03:48 PM | #38 |
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Multimeters are just $12 at walmart. You just need it to read DC volts so you don't need anything fancy. Even the $12 basic model will work.
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03-14-2014, 04:26 PM | #39 |
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03-14-2014, 05:11 PM | #40 |
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where can i get SteveAZ kit 255????
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03-14-2014, 05:33 PM | #42 |
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i've checked the link and,but i can't open it
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03-14-2014, 09:11 PM | #43 | |
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Ugh. I agree man...Have replaced SO MANY parts trying to get this right. It's a sunk cost so I want to make it work. But I just opened up SteveAZ's inline kit, and it is NICE. Looks very well thought out. I'll end up swapping the pumps out very likely just to rule out another hardware part. At that point though, honestly i'm running out of parts to replace. At this point it's just the pressure regulator/filter, and the control module. So come hell or high water i'll get this working.
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03-15-2014, 11:01 AM | #44 |
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pats just started having a similar problem car idles mid 80's will jump to 100 and bounce around at wot . fuel trims look fine too just as a fyi this is completely stock lpfp
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