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BMW 3-Series (E90 E92) Forum
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Help reading datalog n54
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| 01-09-2023, 02:44 PM | #1 |
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Help reading datalog n54
Hello all I took an MHD log 2-3rd gear just want some other opinions on what doesn’t look right and how I can improve it
Fbo v10 stage2+ n54 acn91 https://datazap.me/u/n54marc/v10-sta...og=0&data=3-21 |
| 01-09-2023, 03:54 PM | #2 |
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Cyl 1 timing adjustment in fourth gear (-3degs) is interesting. Boost started teasing 19psi.
Anyone with experience have any comment on that? |
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| 01-09-2023, 06:17 PM | #3 |
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-3 degree of timing correction is normal. I notice my lpfp is dipping to below 50 so I’ll need an upgrade soon. Any idea why my boost isn’t on target for low rpms? Fuel pump is around 80psi during these rpms so might not be the problem.
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| 01-09-2023, 06:33 PM | #4 |
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Were you under extra load? going up a hill or something?
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| 01-09-2023, 06:36 PM | #5 |
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No
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| 01-09-2023, 06:39 PM | #6 |
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Sorry bud. You need someone smarter than me.
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| 01-10-2023, 08:58 AM | #7 | |
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Turbos don't don't instantly reach boost target the moment you go WOT, it takes a couple of hundred rpm normally, around 500rpm from the moment the throttle goes WOT to reaching boost target. It's normal for WGDC to reach around 100% and then settle down after reaching boost target. LPFP does look like it needs an upgrade. |
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| 01-10-2023, 02:41 PM | #8 | |
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Quote:
Appreciate the help. Just trying to get better at reading these. |
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| 01-10-2023, 02:54 PM | #9 | |
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Quote:
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| 01-10-2023, 03:26 PM | #10 |
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Much obliged.
I don't see a "sustained" period below 50, so I'm guessing on other more healthy logs, that droop isn't as significant (or present at all?). |
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| 01-10-2023, 03:29 PM | #11 |
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Yes it dropped below 50
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| 01-10-2023, 03:31 PM | #12 |
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Do my fuel trims look off ? LTFTs are above 10%. Afrs go into fhe 15s low rpms light load is that normal ?
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| 01-10-2023, 06:54 PM | #13 | |
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Possible for Sensor to be faulty but it's probably the LPFP, |
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