LPFP Psi Too low?

[Bimmerny]

running Mhd v9 stage 2+, i believe i may have a hardware issue but wanted to confirm with you guys.

My current low pressure fuel pump psi is ranging between 66psi-68 psi at idle.

Recent maintenance includes an arc terminator ekp3, Lpfp fuel pressure sensor & VDO fuel filter/ fuel pressure regulator Unit.

Currently running a single Walboro 450 with approx 30k miles on it, prior to changing the
fuel filter/ fuel pressure regulator Unit idle lpfp psi was at 78 psi.

If i am not mistaken Target idle lpfp psi should be 72 Psi, would appreciate any insight

 

[Bimmerny]

Bump, could use some help

 

[Neophyte]

Bump, could use some help

It's fine. It's more important at WOT got any logs?

 

[Bimmerny]

It's fine. It's more important at WOT got any logs?

Log 1: https://datazap.me/u/kush/log-1745590384?log=0&data=3-12-24-25&solo=3-24&zoom=0-92&mark=66

Log 2: https://datazap.me/u/kush/log-1745590369?log=0&data=3-25

Log 3: https://datazap.me/u/kush/log-1745590384?log=0&data=3-12-24-25

 

[ktb_e92]

Weird how it's doing that at idle, when before some of those part changes mentioned, you were seeing higher pressure. 70ish-80ish psi is what most peoples' LPFP psi sit at during idle. Otherwise, under boost yours seems to be fine. I saw occasional spikes down into the 50's, but if it were really an issue you'd see a negative trend tanking towards the 50's and 40's rather than a fairly consistent oscillation like how it does right now, which is how all of our cars basically are. For good measure, you could give it a shot at resetting the Lambda Sensors + Regulation adaptations along with Octane Rating. Aside from that, I wouldn't worry. Fueling parameters are hit & miss with OTS maps in terms of how spot-on they are. When you start adding more power / go with a custom tune and see it starting to drop more, then I would revisit troubleshooting what it could be.

 

[Bimmerny]

Weird how it's doing that at idle, when before some of those part changes mentioned, you were seeing higher pressure. 70ish-80ish psi is what most peoples' LPFP psi sit at during idle. Otherwise, under boost yours seems to be fine. I saw occasional spikes down into the 50's, but if it were really an issue you'd see a negative trend tanking towards the 50's and 40's rather than a fairly consistent oscillation like how it does right now, which is how all of our cars basically are. For good measure, you could give it a shot at resetting the Lambda Sensors + Regulation adaptations along with Octane Rating. Aside from that, I wouldn't worry. Fueling parameters are hit & miss with OTS maps in terms of how spot-on they are. When you start adding more power / go with a custom tune and see it starting to drop more, then I would revisit troubleshooting what it could be.

What started all of this is that i was out one day driving and when attempting to get into boost the car felt Naturally aspirated. I go on mhd monitoring and see lpfp psi is maxing at 85 psi steady. Thats when i upgraded the Ekp to the arc terminator and did the LPFP fuel pressure sensor. Then i was seeing 78psi for idle lpfp which i felt was too high.

Bought the VDO fuel filter unit from fcp euro, first one was defective and couldn't build more than 2 psi. Second unit i installed worked but was first at 70.9 psi, then next few start ups went to 68 psi and then 66psi and even saw 64 psi at idle which is throwing me off. Part of me thinks the VDO fuel filter is still is causing an issue unless the low pressure pump itself might be tired.

Check out my older logs from a few years ago and you see much more consistent lpfp psi.

Old log 1: https://datazap.me/u/kush/log-1612664088?log=0&data=3-11-19-20&solo=11-19&mark=30-65-82-32

Old log 2: https://datazap.me/u/kush/log-1612663987?log=0&data=3-11-20&solo=3-11&mark=123