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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > MHD "take a look at my log" thread



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      04-16-2022, 02:45 PM   #5435
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Quote:
Originally Posted by xm4tr1x View Post
Hi guys please assist anyway you can, stationary revs at 1.8-2k oscillating arrrggg!! Tried resetting the adaptations, etc idk what it could be is there a sensor out?

Its running the
3.5bar map, 17t turbos, Inlets, outlets, cp, fmic, index12s, etc

I cant pick whats causing it on the log

https://datazap.me/u/r33sk8ftw/oscil...?log=0&data=16
It's caused by being catless. That's the O2 sensor diagnostic doesn't complete becuase it expects to see a change in reading between the up and downstream sensors. You can see the AFR readings bouncing along with the throttle and timing.

It's not normal and you can fix this with a custom tune.
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      04-16-2022, 10:31 PM   #5436
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Quote:
Originally Posted by CarAbuser View Post
It's caused by being catless. That's the O2 sensor diagnostic doesn't complete becuase it expects to see a change in reading between the up and downstream sensors. You can see the AFR readings bouncing along with the throttle and timing.

It's not normal and you can fix this with a custom tune.
Can you explain why a catted car the rpms would have minor fluctuations whilst stationery, if you revved up trying to hold a steady 2k for example?

Last edited by Saif2018; 04-17-2022 at 01:31 AM..
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      04-16-2022, 10:31 PM   #5437
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Quote:
Originally Posted by CarAbuser View Post
It's caused by being catless. That's the O2 sensor diagnostic doesn't complete becuase it expects to see a change in reading between the up and downstream sensors. You can see the AFR readings bouncing along with the throttle and timing.

It's not normal and you can fix this with a custom tune.
Man i thought as much I raised it with Ken Atkinson when he custom tuned it
Mayb he missed that rev range idk
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      04-16-2022, 10:33 PM   #5438
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Quote:
Originally Posted by Saif2018 View Post
some throttle oscillation when trying to hold revs at certain rpm is normal in my opinion.

How is your idle?

Any 3rd gear logs?
Hey mate it idles fine and heres 3rd gear pulls
https://datazap.me/u/r33sk8ftw/v5?log=0&data=3-22
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      04-17-2022, 01:28 AM   #5439
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Quote:
Originally Posted by xm4tr1x View Post
Hey mate it idles fine and heres 3rd gear pulls
https://datazap.me/u/r33sk8ftw/v5?log=0&data=3-22
That's not with the Hybrid turbos was it?
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      04-17-2022, 02:38 PM   #5440
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Quote:
Originally Posted by Saif2018 View Post
That's not with the Hybrid turbos was it?
Yer why you ask
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      04-17-2022, 03:10 PM   #5441
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Quote:
Originally Posted by xm4tr1x View Post
Yer why you ask
Well the log is dated May 2018 and is only pushing about 14psi up top.

Whereas your latest oscillating logs say hybrids?
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      04-17-2022, 03:43 PM   #5442
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Quote:
Originally Posted by Saif2018 View Post
Can you explain why a catted car the rpms would have minor fluctuations whilst stationery, if you revved up trying to hold a steady 2k for example?
Would have to see the logs to have a better idea. Even then the parameters required to troubleshoot that fully aren't included by standard as part of MHD but the usual timing and afr channels are a good start.

The tune can play a big part. A constant pedal position will ask the DME to produce a variable amount of torque from the engine as the torque request is based on pedal position and RPM. The reported torque is what the DME tries to match with the target torque and that value also varies hugely depending on how the tune is set up.

It could also be that the AFR is unstable because of bad fuelling. Or because of slight ignition issues. Both values are used to generate the reported torque.
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      04-17-2022, 04:03 PM   #5443
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Quote:
Originally Posted by CarAbuser View Post
Would have to see the logs to have a better idea. Even then the parameters required to troubleshoot that fully aren't included by standard as part of MHD but the usual timing and afr channels are a good start.

The tune can play a big part. A constant pedal position will ask the DME to produce a variable amount of torque from the engine as the torque request is based on pedal position and RPM. The reported torque is what the DME tries to match with the target torque and that value also varies hugely depending on how the tune is set up.

It could also be that the AFR is unstable because of bad fuelling. Or because of slight ignition issues. Both values are used to generate the reported torque.
That's interesting, I never found you could hold the revs dead steady by revving when stationary in any car, always some slight minor fluctuations.

I'll try and log it and see what you think.
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      04-18-2022, 12:34 AM   #5444
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Minor fluctuations are to be expected. The RPM shown in MHD logs might fluctuate a little but the tach shouldn't as it's quite heavily smoothed.
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      04-18-2022, 05:48 AM   #5445
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Quote:
Originally Posted by CarAbuser View Post
Minor fluctuations are to be expected. The RPM shown in MHD logs might fluctuate a little but the tach shouldn't as it's quite heavily smoothed.
Ok, that's what I meant. Thank you for the explanation.
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      04-19-2022, 06:57 AM   #5446
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Quote:
Originally Posted by husker335i View Post
If anyone could take a look at this log Id appreciate it. Seems Im chasing a boost leak but maybe Im missing something. 2011 e90 n55. Mhd stage 1 with a Cobb charge pipe. Thanks!

https://datazap.me/u/toconnell25/log...=0&data=3-4-18
Anyone?
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      04-19-2022, 01:42 PM   #5447
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Quote:
Originally Posted by CarAbuser View Post
Would have to see the logs to have a better idea. Even then the parameters required to troubleshoot that fully aren't included by standard as part of MHD but the usual timing and afr channels are a good start.

The tune can play a big part. A constant pedal position will ask the DME to produce a variable amount of torque from the engine as the torque request is based on pedal position and RPM. The reported torque is what the DME tries to match with the target torque and that value also varies hugely depending on how the tune is set up.

It could also be that the AFR is unstable because of bad fuelling. Or because of slight ignition issues. Both values are used to generate the reported torque.
If tq reqis based on tps, the log shows tps fluctuations could this be where the fault is?
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      04-20-2022, 02:41 AM   #5448
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Quote:
Originally Posted by xm4tr1x View Post
If tq reqis based on tps, the log shows tps fluctuations could this be where the fault is?
Tq req is based on pedal position. Throttle position is a different story, that's electronically controlled to maintain an airflow requirement and will oscillate as a symptom rather than a cause.
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      04-22-2022, 09:31 PM   #5449
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Quote:
Originally Posted by Saif2018 View Post
If you don't have any map packs (only the MHD flasher) then flash stage 0, clear codes and relog. Otherwise flash Stage 1 V9 or V10 at least then relog,

Do an Idle log, and a 3rd gear log.

At WOT your HPFP didn't drop below 1500psi, so it seems ok on that "unknown" map.

At idle your HPFP should settle to around 700 psi (after the cold start is finished)
Sorry for not replying for awhile but i just got done replacing a bank of my injectors with index 12 and the car still has the little exhaust pops/stumble on idle and as of yesterday car has been starting and driving vary weird, sometimes when I start the car it will rev between 500-1000k for some reason and now everytime im accelerating from a stop i get this single jerk in acceration going from 0-10 MPH.

Most recent datalog: https://datazap.me/u/cyless335xi/mos...og=0&data=3-22
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      04-23-2022, 04:27 AM   #5450
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Quote:
Originally Posted by Cyless View Post
Sorry for not replying for awhile but i just got done replacing a bank of my injectors with index 12 and the car still has the little exhaust pops/stumble on idle and as of yesterday car has been starting and driving vary weird, sometimes when I start the car it will rev between 500-1000k for some reason and now everytime im accelerating from a stop i get this single jerk in acceration going from 0-10 MPH.

Most recent datalog: https://datazap.me/u/cyless335xi/mos...og=0&data=3-22
Have the plugs been changed recently?

CarAbuser any ideas on what's causing these issues mate?
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      04-24-2022, 02:09 AM   #5451
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Bmw AWD to rwd

I have a question so I have a 2010 335i xdrive and want to convert it to rwd Ik I have to switch the whole front of the suspension.. would I be able to use a 3335i rwd oil pan on the 335i xdrive engine .. and would I need to switch the transmission?
Dose any one know the steps of getting this done
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      04-24-2022, 04:48 AM   #5452
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V7 custom tune,

Can you guys have a look and let me know what you think... ?

https://datazap.me/u/shelim2020/v7-j...og=0&data=3-23

@CarAbuser

@RSL

Timing corrections most likely due to the Tesco momentum fuel I used. Car felt strong throughout the pull. Still got that damn whine at low revs but otherwise running fine.
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      04-24-2022, 09:04 AM   #5453
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Quote:
Originally Posted by Saif2018 View Post
Have the plugs been changed recently?

CarAbuser any ideas on what's causing these issues mate?
Plugs and coils had been just changed as well as injectors.

Edit: I want to clarify that when I start it sometimes the car revs jump up and down between 500-100 RPM for like 25~ seconds then stops.

Last edited by Cyless; 04-24-2022 at 09:45 AM..
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      04-24-2022, 10:07 AM   #5454
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Quote:
Originally Posted by Cyless View Post
Plugs and coils had been just changed as well as injectors.

Edit: I want to clarify that when I start it sometimes the car revs jump up and down between 500-100 RPM for like 25~ seconds then stops.
Have you tried setting cold start noise reduction to see if it makes a difference?

Walnut blasting done?

Other than that, I'm not really sure what else could be causing it.
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      04-24-2022, 10:39 AM   #5455
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Quote:
Originally Posted by Saif2018 View Post
Have you tried setting cold start noise reduction to see if it makes a difference?

Walnut blasting done?

Other than that, I'm not really sure what else could be causing it.
I just cleaned my valves like a week or 2 ago and these problems have just came up (except the little stumble/pops in exhaust).

I also have not tried the cold reduction thing.

Last edited by Cyless; 04-24-2022 at 11:29 AM..
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      04-25-2022, 12:01 AM   #5456
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Fixed my boost leak. How is everything looking?

https://datazap.me/u/ozades/log-1650...data=3-4-20-21
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