[TiAgAu]

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 3562161Attachment 3562162Attachment 3562163Attachment 3562164Attachment 3562165

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

[Yang Liu]

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]

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]

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.

[g20slow]

Glad I found this, Im gonna try not to type a book lmao but I just bench unlocked my 2020 m340i a couple days ago, I went stage 1 91 ots tune right away and uploaded my log to a fb group to get feedback not knowing anything. First log was dangerous I was getting huge timing corrections and knock. After experimenting over the past 3-4 days I have now ended up on the stage 1 e40 ots tune, I am 100% stock. I've learned a lot over the past couple days but if someone that knows more can take a look I'd appreciate it. Also I feel when I log it can be inconsistent Im not sure if thats normal? Like I've ran with zero corrections and do a pull a little later and see some corrections. Heres some of my recent logs just wanna make sure Im not leaning out or anything and that it looks safe. Thanks

https://datazap.me/u/ayyomar/stage-1...og=0&data=3-19

https://datazap.me/u/ayyomar/e40-95f...og=0&data=3-19

https://datazap.me/u/ayyomar/e40-pul...og=0&data=3-19

[R_S]

Originally Posted by R_S

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

Today I checked the whole vacuum and charged air system with smoke tester - no leaks. Both wastegates move freely and I can hear that they are fully closing - checked the operation of them by sucking air from wg vacuum hoses with mouth.
Don't really know where to look further.
Question - should wastegates close and open when reving the engine on a standstill ? Should there be boost when reving the engine?

[lowrydr310]

Originally Posted by lowrydr310

I posted some of my logs a while back and still have some questions about timing corrections and fuel trims. I'm seeing timing corrections across all cylinders.

https://datazap.me/u/lowrydr310/log-...4&zoom=127-250

There's a big discrepancy between bank 1 and bank 2 fuel trims, both short term and long term. Long and short trims for bank 1 are much more negative than those for bank 2. All maintenance is good (coils/plugs, good quality fuel, new LPFP and pressure sensor) the only not so good thing are the injectors.

Bank 1 has three original index 1s with 160K miles.
Bank 2 has two used index 12s from a wrecked car that was running well, and one Index 9.

I'm replying to my own post since I just noticed something in my quoted log that nobody pointed out. Why was the throttle cutting out? I had DTC/DSC disabled completely, and the place where I do my logging has two small dips which bounce the wheels causing loss of traction. Is that it?

I also noticed that on almost every recent log of mine that there are no timing corrections above 3500 RPMs or so. They only appear when I first smash the throttle, across all cylinders, then all zero to the end of the pull. I have another log where I flashed MHD V7 Stage 1 ACN and even though peak boost was 1psi less than what it was on the V10 map, the timing correction behavior is the same. Minor corrections under 3500, then zero after that. Even then on the V7 map, the corrections were on two cylinders - one with an index 01 and one with an index 09 injector.

I'm still thinking faulty injectors, causing the mismatch in fuel trims between banks and the timing corrections at lower RPMs.

Also, nobody pointed out my IATs rising from 99 to 136. Seems excessive for MHD Stage 1 91ACN. Time for a bigger intercooler.

[Sgop335]

Originally Posted by lowrydr310

I'm replying to my own post since I just noticed something in my quoted log that nobody pointed out. Why was the throttle cutting out? I had DTC/DSC disabled completely, and the place where I do my logging has two small dips which bounce the wheels causing loss of traction. Is that it?

.

No. Its because boost mean exceeded boost target by a good bit, meaning overboosted...

[lowrydr310]

Originally Posted by Sgop335

No. Its because boost mean exceeded boost target by a good bit, meaning overboosted...

What would cause that?

[Sgop335]

Originally Posted by lowrydr310

What would cause that?

overboosting? mostly wgdc, strong turbos lol etc. Turbos definitely seem to be boosting strong 2500rpm and up, taking the ots map by surprise. Load requested (boost target) is tapering up slowly in that map.
TC is expected for ots map,
Reason youre not able to see the overboost is because logging parameter boost mean is not logged.
Once logged, overboost becomes evident.