[SlowE92]

Originally Posted by N54_Sauce

Anyone?

Your rail pressure dips, is this the original HPFP?

[N54_Sauce]

Originally Posted by SlowE92

Your rail pressure dips, is this the original HPFP?

To my knowledge, yes. Previous owner never mentioned anything about it being replaced

Both logs show the same info? They’re different revisions, 2nd log is the final revision that I found on the tablet that came with the car.

[SlowE92]

Originally Posted by N54_Sauce

To my knowledge, yes. Previous owner never mentioned anything about it being replaced

Both logs show the same info? They’re different revisions, 2nd log is the final revision that I found on the tablet that came with the car.

You hit boost target at the start of the pull around 4k RPM and then you're under target until 6k RPM where you're over target and then hold that until you let off. Then your rail pressure dips below 1500. Hopefully someone else chimes in. Are you experiencing any jerkiness in the upper RPM or does the car feel like its cutting power?

[N54_Sauce]

Originally Posted by SlowE92

You hit boost target at the start of the pull around 4k RPM and then you're under target until 6k RPM where you're over target and then hold that until you let off. Then your rail pressure dips below 1500. Hopefully someone else chimes in. Are you experiencing any jerkiness in the upper RPM or does the car feel like its cutting power?

No jerking or cutting of power at all, it actually feels ok all the way to redline in 3rd, in 4th it did feel like it slightly lost power right before letting off

[SlowE92]

Originally Posted by N54_Sauce

No jerking or cutting of power at all, it actually feels ok all the way to redline in 3rd, in 4th it did feel like it slightly lost power right before letting off

Alright I looked at the second log and it looks like your short term fuel trims are subtracting fuel in real time. This is usually due to a rich mixture.

[e92Diego]

Originally Posted by e92Diego

I’ll go through another pull today and include what you asked. Do you think a boost leak could be causing these intermittent misfires?

https://datazap.me/u/e92diego/log-17...og=0&data=3-18
Added a log with throttle position, this was not a perfect log as this was only in 4th gear. Traction control was still all the way off. Throttle looks to cut during this WOT pull which is also felt while driving. I've had other short pulls since this log where my rpms will spike very quickly then come back down to a more normal range and work it's way back up like a normal pull. for example 3.5k to a quick spike to 4.5-5k then drop down again to about 3.7k and work it's way back up from there like normal. I've been driving with TC off for about a week now and have not been getting the sporadic jerking I'm accustomed to getting while under normal driving conditions. My question now is could this mean that this is NOT a misfire but instead something else? if i turn traction control back on the jerkiness returns. Throttle cutting down heavily again only occurs while doing a pull, and under normal conditions the car continues to drive relatively normally. I did replace my low pressure fuel sensor a while back which needed me to remove the charge pipe and throttle body. while looking inside i did some a very light amount of oil on the throttle body but did not believe this would affect me much LOL. Intercooler piping on both hot and cold side look to be ok but i can always take another look.

[RINZLER_Mk2]

Hey guys, I need some help reading my data logs to see if there's anything wrong with my car. It seems fine to me when driving it but wanted someone who can read the logs and tell me if there's any problems that I'm unable to see. Everything is stock except for an aluminum charge pipe with Tial blow off valve, oil catch can, and a MHD stage 1 tune with burble settings active. I think I was only doing about 80% full throttle and I don't think I took traction control off when doing the data log but I was in sport mode. Lmk if there's any more info you guys would need to determine the status of my car and any help would be appreciated, thanks 🤜

https://datazap.me/u/rinzler/07-bmw-...og=1&data=3-20

[Mr_N54]

I would like some opinions on this log, car has arm inlets, 19t turbos, upgraded outlets, 3.5bar tmap sensor, stock fuel system (yes I know it’s bad I have a walbro 525 ready for install) car is on mhd v10 St2+
https://datazap.me/u/ussr97/mhd-v10-...og=0&data=3-20

[Sgop335]

Originally Posted by Mr_N54

I would like some opinions on this log, car has arm inlets, 19t turbos, upgraded outlets, 3.5bar tmap sensor, stock fuel system (yes I know it’s bad I have a walbro 525 ready for install) car is on mhd v10 St2+
https://datazap.me/u/ussr97/mhd-v10-...og=0&data=3-20

Car is overboosting. Many timing corrections, lower rpms timing is negative not sure why...

[TiAgAu]

Originally Posted by Mr_N54

I would like some opinions on this log, car has arm inlets, 19t turbos, upgraded outlets, 3.5bar tmap sensor, stock fuel system (yes I know it’s bad I have a walbro 525 ready for install) car is on mhd v10 St2+
https://datazap.me/u/ussr97/mhd-v10-...og=0&data=3-20

Get that new pump in asap.

LPFP is dropping to near 50psi and HPFP rail pressure is also dropping to 760psi you dont want to see this below 1500psi. So yeah it's running lean uptop 13.5AFR should be 12AFR

Also you need a custom tune on 19t's

[falcon9490]

Hello,

I tried to find a similar post for the N54 in the Z4 but didn't come across one - if there is a better place to ask this, please let me know.

I recently installed the MHD stage 1 on my 2011 z4 m35i. During the first highway run, there was some odd behavior in which the engine continued to rev after I abruptly let off of the gas. It almost felt as if the car was in neutral for a few seconds before going back into gear and the revs returning to normal.

Any thoughts on the log?

https://datazap.me/u/falcon940/log-1...-26-27&hg=21-2

City street driving seemed ok although occasionally it would shift pretty hard. Are others finding a DCT tune valuable in addition to the MHD tune?

[minulache]

Hi guys,
Just got the MHD for my car and did a couple of logs on stage 0 flash. How do the logs look? I'm getting ready to install new spark plugs and coils, get an intercooler and go stage 1+ on 91 octane but just trying to get a sense of how the car is performing stock and if I need to look at something else also.
The car in question is an E92 335i N55 PWG running on 91 octane fuel. Did three logs, first two starting in 3rd gear at 2000rpm and the third one going until 4th gear.
In my basic understanding, the 2nd log looks the best out of all of them
Any input appreciated, many thanks
https://datazap.me/u/minulache/3-runs?log=0&data=3-15
https://datazap.me/u/minulache/3-runs?log=1&data=3-15
https://datazap.me/u/minulache/3-runs?log=2&data=15

[vdwlkr]

I have been having some weird electrical issues with my car since my battery died and was hoping someone could hear my issues & see the data logs and assist me in troubleshooting this.

Let me preface by saying that for 2 years before replacing my battery, I had a lead acid battery mistakenly installed and not registered in place of an AGM. I replaced with a proper AGM afterwards, when the battery had completely drained and did not accept a trickle charge or jump.

The battery issues have been an ongoing issue, but weirdly enough, it was parked at my shop for 2 months and only started a brief handful of times to move it, for some suspension work & transmission fluid & filter change, both of which remedied issues I had earlier this year. It’s truly been a great year so far :,)

Anyways, after I replaced the battery I coded it in Bimmercode to the correct voltage and type, and registered it in MHD. Within 4 starts, I got an SES for the first time in awhile. The start also took a second, which again struck me odd for a week old battery.

Active codes:
2BC0 Mixture control, fuel air mixture too lean
36FD DME main relay, plausibility, prematurely dropped out
387C Power management, battery total discharge
3887 vehicle voltage, working area: voltage too low
Shadow codes: 2C42 Mixture control, multiple fault
2D45 Valvetronic, adjustment range, stop not taught in due to ambient conditions

I cleared the SES, and it came back with no codes a few days later, even after 3 starts. Cleared it again, drove it to work the next day, and noticed the AFR was pretty jumpy, bouncing between 13.5 and 16.5 at times in bumper-to-bumper traffic. It was pretty smooth before the battery issues. I noticed that it also smoothed out as I drove, and that the voltage increased slightly the longer I drove, starting around 14.3 & climbing back up to 14.8-15. It also would spike and drop frequently by 5% or so.

A week after the battery swap, I checked my aftermarket 1200W amp & sub, and noticed I had accidentally knocked the ground cable out of amp while dealing with the battery the week before. I reconnected it, and some research told me that could definitely drain the battery.

For the 2 weeks since, no SES light has returned but the AFR has been jumpy for sure, especially at low speeds. Pulls also haven’t felt quite as hard, and peak boost has dropped from 20-21psi to 17-18, usually 14-16.

I reset adaptions on lambda sensors & regulation, and it seemed to help a little bit, but I still can feel it’s off even 100 miles later now.

I took a handful of logs, here are 3 WOT logs:

A pull BEFORE reconnecting the ground wire after 45 min drive: https://datazap.me/u/vdwlkr/pulls-el...a=3-4-12-18-20

A 40-100 pull last night:https://datazap.me/u/vdwlkr/pulls-el...a=3-4-12-18-20

A 80-110 pull a few days ago:https://datazap.me/u/vdwlkr/pulls-el...a=3-4-12-18-20

And 2 idle logs:

Idle to in gear to idle: https://datazap.me/u/vdwlkr/idling-g...ta=11-12-18-20

A healthy idle after 45 min driving: https://datazap.me/u/vdwlkr/idling-g...ata=3-11-12-20

Can someone help me figure out what may be acting up before I hyperfixate on this to death? I see my LTFT & STFT seem to jump around with my voltage & AFR which is interesting.

Anyways, thanks for reading and hopefully sparing my wife from me talking about this for much longer

[YoMuS]

Hi!

I just did my first datalog on stock 335i. I think I might have boost leak, but looking at this log, I can't really tell if it's somehow normal behavior. I don't think I used the right parameters (test-o), or they don't log alright... It is a 7 minutes run back home.

https://datazap.me/u/yomus/335-20240...g=0&data=5-7-8

Could you take a quick look, please? Thank you!

[TiAgAu]

Originally Posted by YoMuS

Hi!

I just did my first datalog on stock 335i. I think I might have boost leak, but looking at this log, I can't really tell if it's somehow normal behavior. I don't think I used the right parameters (test-o), or they don't log alright... It is a 7 minutes run back home.

https://datazap.me/u/yomus/335-20240...g=0&data=5-7-8

Could you take a quick look, please? Thank you!

Dont think anyone is going to read that one. Get MHD if you want to log

[UnlikelyBug]

I have a curious log. I'm trying to figure out why I am overboosting while building boost. I also hit 17 psi on the stock map but I think that can be from the throttle closing on the upshift. Is that right or is that an issue as well? For background I have 122k miles, mostly stock except for charge pipe, larger intercooler, and dv+. Just had to replace my HPFP and I had a coil pack misfire on cylinder 1 after this log (I moved that coil from 4 to 1 to see if the misfire followed).
https://datazap.me/u/julius/stock-ma...=0&data=4-5-20

[E92335ISG]

Hi guys im new here and to the n54 platform , could you guys take a look at my log charts ill drop some information below with the log

Current mods: bms motorsport DCI, FMIC , decatted down pipes , mperformance exhaust non decatted resonator and muffler, evolution racewerkz chargepipe

Logged tune: 93 oct stage 2+ , logged on a gear 4 pull from 2.2k - 6.1k rpm apologies for the low rpm log as i dont have a long road to do this

Question: does the log seem fine? It seems to be pulling timing and AFR doesnt look optimal , can someone with more experience give me more guidance please as to what im looking

Additionally: should i flash back to stage 2 or stage 1+ if this stage 2+ is too aggresive for my setup

gear 4 log

[vadonchez]

Originally Posted by E92335ISG

Hi guys im new here and to the n54 platform , could you guys take a look at my log charts ill drop some information below with the log

Current mods: bms motorsport DCI, FMIC , decatted down pipes , mperformance exhaust non decatted resonator and muffler, evolution racewerkz chargepipe

Logged tune: 93 oct stage 2+ , logged on a gear 4 pull from 2.2k - 6.1k rpm apologies for the low rpm log as i dont have a long road to do this

Question: does the log seem fine? It seems to be pulling timing and AFR doesnt look optimal , can someone with more experience give me more guidance please as to what im looking

Additionally: should i flash back to stage 2 or stage 1+ if this stage 2+ is too aggresive for my setup


gear 4 log

Yes too much timing correction on multiple cylindre.your iat climbs quickly too.what is your FMIC brand ?
Try usual things like coils/sparkplugs/ add some e fuel.
For your next log dont forget to log wgdc and maf g/s.

Exept your timing , rail pressure/boost/stft and afr seems to be ok too me.

V10 2+ IS pretty agressive, try v7 2+ wich tapering more near redline and ask less wgdc but stay powerful.

Less wgdc ->less iat -> less timing correction etc....

[E92335ISG]

vadonchez hey bro , im not sure what FMIC it is cause it came with the car it is quite thick ill try to look for the brand later , IAT can also be due to the fact i reside in singapore , its like 31-36 degrees celcius 24/7 unless it rains then it drop to 23 degress celcius

Spark plugs were just change , one step colder ngk , coils havent been changed im thinking that will be done soon together with my walnut blasting and timing cover gasket (its leaking alittle)

Oh! I didnt know i could use V7 flashes ill try that , i thought they were revised for a reason and people shouldnt be using them

Thanks so much for the advice though! Really appreciate the input


Ps if v7 stage 2+ 93 oct doesnt work , should i do v7 stage 2+ 91 oct? Or just go back to v10 stage 2 or v10 stage 1+?

[335i54n]

^ you need a lpfp 1st, pressure too low, boost target little off (adjust arms)=monitor wastegate duty cycle

[E92335ISG]

Originally Posted by 335i54n

^ you need a lpfp 1st, pressure too low, boost target little off (adjust arms)=monitor wastegate duty cycle

Hey man yeah noted on the LPFP , roger doger will monitor the waste gate duty cycle on the next log , currently flashed back to v10 stage 2 93 oct

[vadonchez]

Originally Posted by E92335ISG

vadonchez hey bro , im not sure what FMIC it is cause it came with the car it is quite thick ill try to look for the brand later , IAT can also be due to the fact i reside in singapore , its like 31-36 degrees celcius 24/7 unless it rains then it drop to 23 degress celcius

Spark plugs were just change , one step colder ngk , coils havent been changed im thinking that will be done soon together with my walnut blasting and timing cover gasket (its leaking alittle)

Oh! I didnt know i could use V7 flashes ill try that , i thought they were revised for a reason and people shouldnt be using them

Thanks so much for the advice though! Really appreciate the input


Ps if v7 stage 2+ 93 oct doesnt work , should i do v7 stage 2+ 91 oct? Or just go back to v10 stage 2 or v10 stage 1+?

You definitely have a problem with fuel supply.
On your 4th gear log, your hpfp is ok but lpfp too low after 4500rpm. Your LTFT is @23% before you WOT and jump up to 30% when you press pedal wot which is too high too me, LTFT should be -5<0<+5% idealy and fall to 0 as soon as you WOT.

I saw your 3th gear wot and it's worse! here your HPFP presure fall below 1500psi after 5500 and up to 600psi only above 6000rpm then your STFT are maxing out to +34% and your afr begin to be lean. On this log too your lpfp pressure is around 45/50psi wich is low for 93oct fuel without ethanol blend.

You should have a problem with lpfp &/or HPFP.

That's not tune related and i think that problem will be there even with over MHD version.

Your boost is ok for V10 2+ with no throttle closure wich is good on this version wich control boost by throttle when v7 control boost by wgdc only.