[eastsidaz]

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.

[edwinedwin]

https://datazap.me/u/edwin/log-17281...og=0&data=3-21

Here’s my log. Car been running weird lately but couldn’t find the reason. She’s a 335xi with 19t turbo with a custom tune. Thank you for anyone who’s replying.

[Sgop335]

Originally Posted by edwinedwin

https://datazap.me/u/edwin/log-17281...og=0&data=3-21

Here’s my log. Car been running weird lately but couldn’t find the reason. She’s a 335xi with 19t turbo with a custom tune. Thank you for anyone who’s replying.

Bank 1 stft is 0. So lamdas are lean, not good. Any codes ?
Other than that, boost leak / sluggish turbos

[edwinedwin]

Originally Posted by Sgop335

Bank 1 stft is 0. So lamdas are lean, not good. Any codes ?
Other than that, boost leak / sluggish turbos

2CA6 - DME: Oxygen sensor heater before catalytic converter: Function.
2CAA - DME: Oxygen sensor before catalytic converter: Temperature.
30FC - DME: Turbocharger, charge-air pressure too low: leak-tightness.
These are the code that I got but just changed o2 sensors like a month ago

[sykriss]

I know this thread is for N54s, but it seems to be the most active "check out my log" thread, so I figured I'd drop this in here and see what kind of feedback I could get. Car is a 2012 PWG N55 F30 with ~157k miles, stock aside from chargepipes, on MHD Stage 2. Had no issues prior to tune, and still don't really have any issues, I just noticed some odd things when reviewing the logs and want to be sure I'm getting the most out of my N55. Only symptoms are the turbo feeling a bit unresponsive, and WGDC oscillation in the logs, which does sometimes turn into noticeable boost oscillation on warmer days. I've also noticed that my load actual is consistently quite a bit below load requested, and STFTs tend to drop down to -4 to -8% when WOT. I've ordered a new boost solenoid to see if that changes anything - other ideas/feedback would be appreciated! The car runs and drives great, still pulls way harder than it did stock - just trying to get it running 100%. Thanks!

Datalog

[konstat]

Originally Posted by sykriss

I know this thread is for N54s, but it seems to be the most active "check out my log" thread, so I figured I'd drop this in here and see what kind of feedback I could get. Car is a 2012 PWG N55 F30 with ~157k miles, stock aside from chargepipes, on MHD Stage 2. Had no issues prior to tune, and still don't really have any issues, I just noticed some odd things when reviewing the logs and want to be sure I'm getting the most out of my N55. Only symptoms are the turbo feeling a bit unresponsive, and WGDC oscillation in the logs, which does sometimes turn into noticeable boost oscillation on warmer days. I've also noticed that my load actual is consistently quite a bit below load requested, and STFTs tend to drop down to -4 to -8% when WOT. I've ordered a new boost solenoid to see if that changes anything - other ideas/feedback would be appreciated! The car runs and drives great, still pulls way harder than it did stock - just trying to get it running 100%. Thanks!

Datalog

You mentioned your car being stock aside from charge pipes, did you mean downpipes?

If you car didn’t have boost oscillations when it was stock then I’m not sure why it would be with the tune unless maybe it was tune related. If you flash back to stock map and log does it still oscillate?

Negative STFT is due to the fuel table in the tune. The fuel table has more fuel in case you need to run ethanol for timing corrections.

[sykriss]

Originally Posted by konstat

You mentioned your car being stock aside from charge pipes, did you mean downpipes?

If you car didn’t have boost oscillations when it was stock then I’m not sure why it would be with the tune unless maybe it was tune related. If you flash back to stock map and log does it still oscillate?

Negative STFT is due to the fuel table in the tune. The fuel table has more fuel in case you need to run ethanol for timing corrections.

No, it just has VRSF inlet and turbo outlet chargepipes - stock downpipe, IC, etc. Interestingly enough, the STFTs in that log look nearly perfect, they usually drop a bit in the negative. I have a bunch of other logs where they drop to (usually) -8%. I know Stage 2 is supposed to be for cars with a FMIC or DP, but from what I've read, as long as I don't do long pulls and let IATs skyrocket, I should be fine. Seems to be the case, as well, the car has been doing great - if I wasn't logging and reviewing the logs, I wouldn't suspect anything is wrong. You can see there are no timing corrections in the log I provided, it runs and pulls great - that being said, in the warmer weather where the issue presents itself, there are usually minor corrections happening. No oscillations on stock tune, and WGDC is a nice smooth line. The oscillating seems to mainly happen when it's warm/hot out and the DME is commanding 16-17lbs of boost, leading me to believe it's a worn solenoid or DV that, while fine for stock boost, can't quite keep up at higher boost. I have pictures of some of the logs where it oscillates badly, but the logs auto-deleted, and now that the weather is cooling off the issue is nowhere near as persistent. It also kindof seems as if the DME is over-compensating in its PID control of the gate for some reason. Also, the wgpos_ausy PID goes totally nuts during these oscillations, but I'm not sure what that PID actually means. If it's wastegate position then the WG is clearly oscillating badly.

[konstat]

Originally Posted by sykriss

No, it just has VRSF inlet and turbo outlet chargepipes - stock downpipe, IC, etc. Interestingly enough, the STFTs in that log look nearly perfect, they usually drop a bit in the negative. I have a bunch of other logs where they drop to (usually) -8%. I know Stage 2 is supposed to be for cars with a FMIC or DP, but from what I've read, as long as I don't do long pulls and let IATs skyrocket, I should be fine. Seems to be the case, as well, the car has been doing great - if I wasn't logging and reviewing the logs, I wouldn't suspect anything is wrong. You can see there are no timing corrections in the log I provided, it runs and pulls great - that being said, in the warmer weather where the issue presents itself, there are usually minor corrections happening. No oscillations on stock tune, and WGDC is a nice smooth line. The oscillating seems to mainly happen when it's warm/hot out and the DME is commanding 16-17lbs of boost, leading me to believe it's a worn solenoid or DV that, while fine for stock boost, can't quite keep up at higher boost. I have pictures of some of the logs where it oscillates badly, but the logs auto-deleted, and now that the weather is cooling off the issue is nowhere near as persistent. It also kindof seems as if the DME is over-compensating in its PID control of the gate for some reason. Also, the wgpos_ausy PID goes totally nuts during these oscillations, but I'm not sure what that PID actually means. If it's wastegate position then the WG is clearly oscillating badly.

The PID is the feedback control loop used to control WG actuation so that boost is stable. Because the PID output is oscillating you’d also expect the boost to oscillate.

What this seems like is a set of incorrect PID values for your hardware setup. PID needs to be tuned based on the amount of airflow entering and exiting the engine (intake and exhaust). Since the Stage 2 map is tuned for increased exhaust flow (high flow or catless downpipes) and stock intake airflow (stock turbo inlet/outlets) it seems like you need a custom tune for your setup

[j2dad5389]

How do you guys get the html links? I can only get a text file

[eastsidaz]

Originally Posted by j2dad5389

How do you guys get the html links? I can only get a text file

You mean datazap links? Make an account and upload your log.

[juann54]

Hi everyone, thanks in advance. I’ve been struggling to solve a cold start rough idle issue with my BMW 335i N54 DCT.

The problem only occurs when I start the car in the morning. The only code showing is a misfire in cylinder 6, along with a shadow code 2AAF (which I’ve heard is normal). The car shakes quite a bit, but if I start it up and drive right away, it doesn’t misfire — only when I let it idle for a couple of seconds. So far, I’ve replaced the spark plugs, coils, injectors, and primary O2 sensors. It’s running MHD Stage 2 with cold start noise reduction (which helped quite a bit), VRSF charge pipe, downpipes, etc.

I’ve never done a walnut blast but am looking forward to it. Since I’m from Argentina and there aren’t any workshops that know the N54 well, I do most of the repairs and upgrades myself, but I haven’t had time for this one yet. The car has around 90,000 miles.

I’ve uploaded a log to datazip, any information at all would be appreciated.

ROUGH IDLE LOG COLD START ONLY


https://datazap.me/u/butchern54/n-54...0&data=3-14-21

[eastsidaz]

Originally Posted by juann54

Hi everyone, thanks in advance. I’ve been struggling to solve a cold start rough idle issue with my BMW 335i N54 DCT.

The problem only occurs when I start the car in the morning. The only code showing is a misfire in cylinder 6, along with a shadow code 2AAF (which I’ve heard is normal). The car shakes quite a bit, but if I start it up and drive right away, it doesn’t misfire — only when I let it idle for a couple of seconds. So far, I’ve replaced the spark plugs, coils, injectors, and primary O2 sensors. It’s running MHD Stage 2 with cold start noise reduction (which helped quite a bit), VRSF charge pipe, downpipes, etc.

I’ve never done a walnut blast but am looking forward to it. Since I’m from Argentina and there aren’t any workshops that know the N54 well, I do most of the repairs and upgrades myself, but I haven’t had time for this one yet. The car has around 90,000 miles.

I’ve uploaded a log to datazip, any information at all would be appreciated.

ROUGH IDLE LOG COLD START ONLY


https://datazap.me/u/butchern54/n-54...0&data=3-14-21

Fuel pressures look good. However something weird is happening to bank 2 it seems to add to much fuel, at a point it went to 10AFR before trims pull the fuel shortly after. You say you replaced primary o2's? So you got oem bosch ones? Not sure if the secondary's o2 would cause this issue.

[juann54]

Originally Posted by TiAgAu

Fuel pressures look good. However something weird is happening to bank 2 it seems to add to much fuel, at a point it went to 10AFR before trims pull the fuel shortly after. You say you replaced primary o2's? So you got oem bosch ones? Not sure if the secondary's o2 would cause this issue.

Yes I did replace both primary o2s, OEM Bosh ones, could a leaky inyector cause this? I’ve swapped 6 to 1 to see if it follows (even if i had already changed them all) but missfire keeps being in cyl 6 (correctly coded inyectors using INPA), I haven’t tried 4 and 5 (just to check why those bank 2 AFR). AFR are around 14.7 on both banks once the car has been driven a few blocks. Could leaky valve seals be causing this? It doesn’t smoke. Are those stft % ok? Thaks for the reply!