MHD "take a look at my log" thread

TiAgAu · 09-26-2024, 04:31 PM

Quote:

Originally Posted by Yang Liu

hi fellows,
I have an 09 e90 n54 335. I just start learning self-tune for my car.
i have a question about the boost target. i attached 3 logs of my self-tune logs, i can see the initial boost target has a deep concave/step. i tried to set high load request all cross the rpm with modified BLM/LLF as below attached screenshot, but unfortunately it didn't help. i checked WedgePerformance tune's log, they all have very smooth/sharp boost target at the beginning. May i know the reason for this?
thanks in advance!

self-tune logs:
https://datazap.me/u/dragonfly1112/s...og=2&data=3-24
https://datazap.me/u/dragonfly1112/s...og=0&data=3-24
https://datazap.me/u/dragonfly1112/s...og=1&data=3-24

Attachment 3562161 Attachment 3562162 Attachment 3562163 Attachment 3562164 Attachment 3562165

Since your using the MHD+ Gear x RPM boost ceiling, have enabled the "Enable Custom 3D Boost Ceiling Table"?

Yang Liu · 09-26-2024, 06:12 PM

Quote:

Originally Posted by TiAgAu

Since your using the MHD+ Gear x RPM boost ceiling, have enabled the "Enable Custom 3D Boost Ceiling Table"?

Yes! But this settings will not cause the concave initial boost target issue

R_S · Today, 03:08 PM

Hello guys.
My N54 335i is not making a boost and throwing a 30ff code after it was standing still in the garage for 2 years. During this time I have done some maintenance jobs, changed rod bearings, hydraulic lifters, fixed cam ledges, etc., but nothing involving turbos. Before making this log, I checked all the vacuum plumbing, and everything seems fine; no leaks were found. As far as I can read this log, my car is not making any boost, right? At the same time, vacuum applied to the wastegates is sufficient for them to operate normally, if I interpret this log right. Would that mean that one of both wastegates is just mechanically not operating and stays open? I cannot see any major boost leaks from the IC or CP plumbing. Pull was done on MHD Stage 0 tune (stock power).

Any feedback that points me in the right direction is highly appreciated.

https://datazap.me/u/maverx/29092024...data=3-4-20-28

vadonchez · Today, 03:27 PM

Some ideas 💡:
-check vacuum with a gauge to exclude a problem with your vacuum pump ?
-disconnect vacuum hose from vacuum tank and see if you can hear vacuum typical noise.
-Try to apply vacuum manually to wastegate actuator and see if they move freely.

Today, 03:08 PM	#6053
R_S New Member 0 Rep 9 Posts Drives: BMW 335i E90 Join Date: Apr 2023 Location: Europe iTrader: (0)	Hello guys. My N54 335i is not making a boost and throwing a 30ff code after it was standing still in the garage for 2 years. During this time I have done some maintenance jobs, changed rod bearings, hydraulic lifters, fixed cam ledges, etc., but nothing involving turbos. Before making this log, I checked all the vacuum plumbing, and everything seems fine; no leaks were found. As far as I can read this log, my car is not making any boost, right? At the same time, vacuum applied to the wastegates is sufficient for them to operate normally, if I interpret this log right. Would that mean that one of both wastegates is just mechanically not operating and stays open? I cannot see any major boost leaks from the IC or CP plumbing. Pull was done on MHD Stage 0 tune (stock power). Any feedback that points me in the right direction is highly appreciated. https://datazap.me/u/maverx/29092024...data=3-4-20-28
	Appreciate 0 Quote

Today, 03:27 PM	#6054
vadonchez Private First Class 40 Rep 108 Posts Drives: z4 35IS Join Date: Sep 2022 Location: FRANCE iTrader: (0)	Some ideas 💡: -check vacuum with a gauge to exclude a problem with your vacuum pump ? -disconnect vacuum hose from vacuum tank and see if you can hear vacuum typical noise. -Try to apply vacuum manually to wastegate actuator and see if they move freely.
	Appreciate 0 Quote