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      04-05-2023, 05:08 PM   #1
meronshabba
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b58 cuts power when WOT?

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Hello everyone, recently everytime I downshift and floor it, the car goes but then cuts power at like 5.5k rpms. Anyone had this issue before? Or if anyone could have some idea of what it could be. I’m also stage 2 e40, stage 3 xhp.
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      04-05-2023, 05:32 PM   #2
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Datalog it
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      04-06-2023, 12:00 AM   #3
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Quote:
Originally Posted by thejeremyman9 View Post
Datalog it
Know how to analyze it?
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      04-06-2023, 11:07 AM   #4
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Quote:
Originally Posted by meronshabba View Post
Know how to analyze it?
Some might say so https://f30.bimmerpost.com/forums/sh....php?t=1732327
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      04-07-2023, 11:28 AM   #5
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Dollars to donuts your transmission is fucked! This is exactly what led me to getting a PDS transmission. If it's happening as you downshift into 3rd or 6th aggressively, it is def your issue.

To verify you'll need an actual scanner. BM3 wont do it. You'll need to log the transmission TURBINE SPEED to the OUTPUT SPEED sensors. Drive it while logging. Do the aggressive downshift. Pause the log and zoom in. Did the turbine speed drop by 50rpm as compared to output speed? If yes, replace the transmission.
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      04-07-2023, 11:37 AM   #6
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For OP's sake I sure hope it's not a bad transmission. If it is though, would XHP maybe be the culprit? The ZF is pretty bullet proof from what people say hence why it's used in so many cars.
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      04-07-2023, 01:55 PM   #7
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XHP doesn't cause transmission failures, especially with OTS tunes. If you start modifying things, using aggressive launch or other settings (which they warn about), then you could accelerate wear.
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      04-09-2023, 12:51 AM   #8
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Quote:
Originally Posted by LA1Z24 View Post
Dollars to donuts your transmission is fucked! This is exactly what led me to getting a PDS transmission. If it's happening as you downshift into 3rd or 6th aggressively, it is def your issue.

To verify you'll need an actual scanner. BM3 wont do it. You'll need to log the transmission TURBINE SPEED to the OUTPUT SPEED sensors. Drive it while logging. Do the aggressive downshift. Pause the log and zoom in. Did the turbine speed drop by 50rpm as compared to output speed? If yes, replace the transmission.
It can’t be the transmission, this issue was going on before I got xhp (only had xhp for few months) but back then it would only happen when I did high speed rolls (60,80) but now it’s happening at low speeds such as 30-40 rolls. A Buddy suggested it’s a boost leak, the engine is cutting power because it’s not receiving all the boost the turbo is producing, so the car slows down instead of blowing up.
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      04-09-2023, 10:26 PM   #9
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Upstream O2 sensor was the cause of similar problems on my f30.
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      04-09-2023, 10:57 PM   #10
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Quote:
Originally Posted by SebsM2 View Post
Upstream O2 sensor was the cause of similar problems on my f30.
You were going through the same issue?
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      04-10-2023, 06:42 PM   #11
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Quote:
Originally Posted by meronshabba View Post
It can’t be the transmission, this issue was going on before I got xhp (only had xhp for few months) but back then it would only happen when I did high speed rolls (60,80) but now it’s happening at low speeds such as 30-40 rolls. A Buddy suggested it’s a boost leak, the engine is cutting power because it’s not receiving all the boost the turbo is producing, so the car slows down instead of blowing up.
We can guess all we want until we get datalogs

No sure how you would theorize that the car would blow up due to a boost leak. It might cause excessively high WGDC but that's about it... you usually get air mass or other codes with a boost leak also, depending on the severity.
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      04-10-2023, 10:08 PM   #12
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https://datazap.me/u/meronshabba/log...0&data=1-15-17
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      04-10-2023, 10:10 PM   #13
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Quote:
Originally Posted by meronshabba View Post
That’s a log from a while back.
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      04-11-2023, 05:07 PM   #14
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Quote:
Originally Posted by meronshabba View Post
Is this a log of the issue occurring? I dont see anything happening at 5500 rpm. timing looks fine and boost is a bit below target but probably because you started in 3rd
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      04-11-2023, 07:30 PM   #15
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Quote:
Originally Posted by thejeremyman9 View Post
Is this a log of the issue occurring? I dont see anything happening at 5500 rpm. timing looks fine and boost is a bit below target but probably because you started in 3rd
So yea I started I’m 3rd, took off and I think it was in either 4th or 5th gear where the power was cut, right after shifting.
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      04-11-2023, 07:37 PM   #16
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Quote:
Originally Posted by meronshabba View Post
So yea I started I’m 3rd, took off and I think it was in either 4th or 5th gear where the power was cut, right after shifting.
Throttle closes and boost target drops significantly in 5th. Looks like you are hitting torque limits, its possible that's causing it. Do you have XHP installed to raise torque limits?

EDIT: Just read that you have XHP stage 3. Check your XHP and MHD settings to make sure they are correct with respect to the torque limits. IIRC in MHD at least for N55 you need to tell it you have XHP.
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      04-11-2023, 08:23 PM   #17
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Quote:
Originally Posted by thejeremyman9 View Post
Throttle closes and boost target drops significantly in 5th. Looks like you are hitting torque limits, its possible that's causing it. Do you have XHP installed to raise torque limits?

EDIT: Just read that you have XHP stage 3. Check your XHP and MHD settings to make sure they are correct with respect to the torque limits. IIRC in MHD at least for N55 you need to tell it you have XHP.
The log I sent xhp wasn’t installed back then
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      04-11-2023, 10:32 PM   #18
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Quote:
Originally Posted by meronshabba View Post
The log I sent xhp wasn’t installed back then
Did the problem still happen after installing XHP and re-flashing MHD with that setting enabled?
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      04-11-2023, 10:42 PM   #19
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Quote:
Originally Posted by thejeremyman9 View Post
Did the problem still happen after installing XHP and re-flashing MHD with that setting enabled?
Yessir, there was a option on Mhd that removed TCU torque limiters, it says “not required for ots maps” but I still checked it and I just drove it hard for about an hour and it did well, hopefully that fixed the problem
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      04-19-2023, 12:10 PM   #20
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Here’s these two pulls, usually on my hp display it goes up to 560ish but with these it only went up to 480ish

https://datazap.me/u/meronshabba/low...og=0&data=3-19

https://datazap.me/u/meronshabba/low...og=0&data=3-19

I’d really appreciate it if y’all can help me out on these
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      04-19-2023, 05:19 PM   #21
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Quote:
Originally Posted by meronshabba View Post
Here’s these two pulls, usually on my hp display it goes up to 560ish but with these it only went up to 480ish

https://datazap.me/u/meronshabba/low...og=0&data=3-19

https://datazap.me/u/meronshabba/low...og=0&data=3-19

I’d really appreciate it if y’all can help me out on these
The boost target in these is very low, <10psi. Also, you need to log single gear 4th gear pulls as described in my thread i linked above.
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      04-19-2023, 07:05 PM   #22
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Quote:
Originally Posted by thejeremyman9 View Post
The boost target in these is very low, <10psi. Also, you need to log single gear 4th gear pulls as described in my thread i linked above.
The car ran fine when logging these two. 4th gear pulls.

https://datazap.me/u/meronshabba/4th...og=0&data=3-19

https://datazap.me/u/meronshabba/4th...og=0&data=3-19
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