[ilikemycar]

Hey guys, i have some issues with occasional very small misfire mostly on 4,5,6 gears from bottom ( approx 2000rpm ). Mostly it happens on WOT in 6 gear. I saw there is timing correction -6 on one valve. I recently changed sparkplugs, 1 step colder NGK and gapped them to 0.22inch. What do you think about my graph? Should i put OEM Bosch spark plugs with no gap? I dont have any codes or even shadow codes.

Car is 2011 E90 335i - N55, running MHD V1.60 STAGE2+, Wagner cooler + Wagner sport catted downpipe & Burgermotorsport intake.

5th to 6th GEAR WOT / https://datazap.me/u/kubusher/5-6-sp...?log=0&data=14

4th - 6th GEAR WOT and 6th GEAR WOT / https://datazap.me/u/kubusher/4-5-sp...?log=0&data=14

Thanks for any help 🙏🏻 Much appreciated

[whyzee125]

My N55 developed misfires with no codes in most gears under load. Worst in 6th obviously. It was fixed by replacing the metal sleeved Delphi coils with Bosch coils.

[ilikemycar]

Thanks for answer dude, was your 335i tuned ? Did you gap your spark plugs ? Thanks for info.

[SlowE92]

Originally Posted by ilikemycar

Hey guys, i have some issues with occasional very small misfire mostly on 4,5,6 gears from bottom ( approx 2000rpm ). Mostly it happens on WOT in 6 gear. I saw there is timing correction -6 on one valve. I recently changed sparkplugs, 1 step colder NGK and gapped them to 0.22inch. What do you think about my graph? Should i put OEM Bosch spark plugs with no gap? I dont have any codes or even shadow codes.

Car is 2011 E90 335i - N55, running MHD V1.60 STAGE2+, Wagner cooler + Wagner sport catted downpipe & Burgermotorsport intake.

5th to 6th GEAR WOT / https://datazap.me/u/kubusher/5-6-sp...?log=0&data=14

4th - 6th GEAR WOT and 6th GEAR WOT / https://datazap.me/u/kubusher/4-5-sp...?log=0&data=14

Thanks for any help ���� Much appreciated

These graphs look odd. Why does your throttle position climb like that when WOT? Is this custom tuned? Shouldn't throttle position be at 81 when WOT? This jumps to 100.4.

[ilikemycar]

Originally Posted by SlowE92

These graphs look odd. Why does your throttle position climb like that when WOT? Is this custom tuned? Shouldn't throttle position be at 81 when WOT? This jumps to 100.4.

Thanks for reply man, yes its weird. Not custom, OTS map from MHD Stage 2+ oct95 v1.60

[SlowE92]

Originally Posted by ilikemycar

Thanks for reply man, yes its weird. Not custom, OTS map from MHD Stage 2+ oct95 v1.60

I would flash a different map or flash the stock map and try and log again. I've seen throttle closure due to overboost, but it dips and immediately goes back to normal. Your throttle position climbs slowly and your pedal is 100% pressed. The max I thought was 81. Someone else correct me if I'm wrong.

Edit: Your short term fuel trims also drop in a somewhat linear fashion, indicating your pulling fuel due to a rich mixture.

[ilikemycar]

Originally Posted by SlowE92

I would flash a different map or flash the stock map and try and log again. I've seen throttle closure due to overboost, but it dips and immediately goes back to normal. Your throttle position climbs slowly and your pedal is 100% pressed. The max I thought was 81. Someone else correct me if I'm wrong.

Edit: Your short term fuel trims also drop in a somewhat linear fashion, indicating your pulling fuel due to a rich mixture.

Hey man, these are new graphs. I flashed v1.84 stage 2+ map with 93oct for now instead 95oct. I am getting quite bad timing corrections. I ordered new coils from Delphi, will change and hopefully it will helps.

https://datazap.me/u/kubusher/3-logs...?log=0&data=14

[wheela]

I'm on 1.6 stage 2+ and have also tried 1.84 stage 2+, (though I'm 9e60b) and I've never seen my wgdc% go any where near as high as yours does. This, and your stft going very negative at the end make me suspect a boost leak.

Also, despite an apparent boost leak, your load actual is actually pretty close to target (for these OTS tunes anyway...), which I wouldn't expect given a boost leak. I see you're running the BMS intake - this can mess with your MAF readings unless you have a custom tune set up to compensate for it (it will put readings just far enough out where some people can get codes, and others don't). Since your load actual seems overly optimistic to me, I suspect that's because of the BMS intake throwing off the MAF reading (which is a direct input to the DME's load calculation). This could also be facturing into your stft issue along with a boost leak.

If it were my car, I'd start by putting the oem intake back, and searching for a boost leak. Can't expect it to run properly if it's getting incorrect MAF readings, and then losing variable amounts of metered air through a boost leak. Then I'd drive around normally for a bit to let adaptations adjust and then take some more logs to see if/how things changed.

Good luck, and keep us posted!

[ilikemycar]

Originally Posted by wheela

I'm on 1.6 stage 2+ and have also tried 1.84 stage 2+, (though I'm 9e60b) and I've never seen my wgdc% go any where near as high as yours does. This, and your stft going very negative at the end make me suspect a boost leak.

Also, despite an apparent boost leak, your load actual is actually pretty close to target (for these OTS tunes anyway...), which I wouldn't expect given a boost leak. I see you're running the BMS intake - this can mess with your MAF readings unless you have a custom tune set up to compensate for it (it will put readings just far enough out where some people can get codes, and others don't). Since your load actual seems overly optimistic to me, I suspect that's because of the BMS intake throwing off the MAF reading (which is a direct input to the DME's load calculation). This could also be facturing into your stft issue along with a boost leak.

If it were my car, I'd start by putting the oem intake back, and searching for a boost leak. Can't expect it to run properly if it's getting incorrect MAF readings, and then losing variable amounts of metered air through a boost leak. Then I'd drive around normally for a bit to let adaptations adjust and then take some more logs to see if/how things changed.

Good luck, and keep us posted!

Yoooo.. thanks for comment, interesting stuff dude 👍🏻 i ordered full oem intake already 3 days ago so deffo looking forward to that ! Do you think it can actually make bad timing corrections? Thanks for info 🙏🏻

[SlowE92]

Originally Posted by ilikemycar

Hey man, these are new graphs. I flashed v1.84 stage 2+ map with 93oct for now instead 95oct. I am getting quite bad timing corrections. I ordered new coils from Delphi, will change and hopefully it will helps.

https://datazap.me/u/kubusher/3-logs...?log=0&data=14

Your throttle stays open even after letting off the pedal. At the end of your log from 5k to 4.5k RPM your off the pedal and your throttle is still at 100%. I'd pull off the throttle body and check and see if the blade has free movement. If it does then possibly a faulty throttle position sensor. Is this MT or AT?

[wheela]

Originally Posted by ilikemycar

Yoooo.. thanks for comment, interesting stuff dude 👍🏻 i ordered full oem intake already 3 days ago so deffo looking forward to that ! Do you think it can actually make bad timing corrections? Thanks for info 🙏🏻

Potentially. Your car needs to hit the right AFR, so if things are causing AFR to go lean it can result in timing corrections. With incorrect MAF readings and a boost leak, it can be challenging for the car. It has fuel trims based on O2 feedback and MAF adaptations to try and compensate, but they can only do so much in transient conditions - the further things are from reality (regarding actual air flow) the less effective the compensations will be.

[wheela]

Originally Posted by SlowE92

Your throttle stays open even after letting off the pedal. At the end of your log from 5k to 4.5k RPM your off the pedal and your throttle is still at 100%. I'd pull off the throttle body and check and see if the blade has free movement. If it does then possibly a faulty throttle position sensor. Is this MT or AT?

If you take a look at throttle position request, it's still requesting 100% for that point of time after letting off where he's at 100% throttle position. Since the throttle plate is doing what the DME is telling it to do, I don't suspect any issues there - probably some throttle hang programmed in the DME.

[ilikemycar]

Originally Posted by wheela

Potentially. Your car needs to hit the right AFR, so if things are causing AFR to go lean it can result in timing corrections. With incorrect MAF readings and a boost leak, it can be challenging for the car. It has fuel trims based on O2 feedback and MAF adaptations to try and compensate, but they can only do so much in transient conditions - the further things are from reality (regarding actual air flow) the less effective the compensations will be.

Thanks for valuable info dude, appreciated it.

Picture from day i bought it.

[ilikemycar]

Originally Posted by SlowE92

Your throttle stays open even after letting off the pedal. At the end of your log from 5k to 4.5k RPM your off the pedal and your throttle is still at 100%. I'd pull off the throttle body and check and see if the blade has free movement. If it does then possibly a faulty throttle position sensor. Is this MT or AT?

Its 6speed manual, i will check that throttle body 💪🏻 thank you

[wheela]

Originally Posted by ilikemycar

Thanks for valuable info dude, appreciated it.

Picture from day i bought it.

No problem! About that big throttle closure you have at the start of some of your logs - this could potentially be due to that BMS intake as well. If you look at load request and load actual at that point, your load actual is actually at load request. I think the DME is closing the throttle plate to keep load actual from exceeding load request. However, I don't recall seeing these n55 OTS maps ever being able to keep load actual up at load request. Load is just airflow (MAF) normalized as a percentage of cylinder fill. I suspect in reality your not actually hitting load request- I think your MAF is off from that BMS intake, so your DME THINKS it's hitting load request, and is closing the throttle plate to prevent load actual from exceeding load request. Having load actual being off will affect basically every map - most critically your timing and fuel maps will be targeting incorrect timing advance and AFR for the actual conditions your engine is experiencing.

[ilikemycar]

Originally Posted by wheela

No problem! About that big throttle closure you have at the start of some of your logs - this could potentially be due to that BMS intake as well. If you look at load request and load actual at that point, your load actual is actually at load request. I think the DME is closing the throttle plate to keep load actual from exceeding load request. However, I don't recall seeing these n55 OTS maps ever being able to keep load actual up at load request. Load is just airflow (MAF) normalized as a percentage of cylinder fill. I suspect in reality your not actually hitting load request- I think your MAF is off from that BMS intake, so your DME THINKS it's hitting load request, and is closing the throttle plate to prevent load actual from exceeding load request. Having load actual being off will affect basically every map - most critically your timing and fuel maps will be targeting incorrect timing advance and AFR for the actual conditions your engine is experiencing.

Damn, it make sense. I cant wait to put oem intake back and retest. Legend 🙏🏻 Thanks 💪🏻 I will post info as soon as i will have it back installed, with new coils as well.

[wheela]

Originally Posted by ilikemycar

Damn, it make sense. I cant wait to put oem intake back and retest. Legend 🙏🏻 Thanks 💪🏻 I will post info as soon as i will have it back installed, with new coils as well.

Sweet, looking forward to your results!

Building on my last comment, boost leak could also really contribute to that throttle closure, as your turbo will work harder and suck a lot more air through the intake (pushing up MAF and therefore load) with a boost leak - it's just all that air won't be going into the engine.

[anjuna]

i run throttle position 100% at all times.

Valvetronic is a thing mans.

idk when this log was from - it's old because i don't even log throttle position any more...

https://datazap.me/u/marshessn/log-1...2-19-23&solo=3

[335xin55]

I am similiar issues. Im very new to logging and reading the data. Cant tell if it a hardware or software issue.

https://datazap.me/u/335xin55

All data logs on this account are for this problem. Any info helps

[ilikemycar]

Originally Posted by 335xin55

I am similiar issues. Im very new to logging and reading the data. Cant tell if it a hardware or software issue.

https://datazap.me/u/335xin55

All data logs on this account are for this problem. Any info helps

Dude, i see your rail pressure log. Its dropping, exactly same as on my newest logs. I think mhd map is too agressive for my hpfp pump ( still stock after 100k miles )

When driving it on WOT it feels that i have issues with fueling ( when its sort of misfiring ) - i dont have any codes tho.

[ilikemycar]

Originally Posted by wheela

Sweet, looking forward to your results!

Building on my last comment, boost leak could also really contribute to that throttle closure, as your turbo will work harder and suck a lot more air through the intake (pushing up MAF and therefore load) with a boost leak - it's just all that air won't be going into the engine.

Hey dude, check this graph please. Look for rail pressure value. When running MHD map Stage1/2 ( any tuned map - its so bouncy under WOT ) except for Stock map ( i dont have any issues under WOT )

STAGE 2
https://datazap.me/u/kubusher/stage-...0&data=2-14-15

STOCK
https://datazap.me/u/kubusher/stage0?log=0&data=2-16-17

I think i have some fueling issues. I recently replaced lpfp as i thought that can be issue, still have stock oem HPFP on my car ( 100k miles ) maybe when running tuned mhd map my hpfp cant handle it, or map is wrong and i may get custom tune.

About intake, i havent changed it yet, one part of it came broken so i have to wait for new one. But we checked for boostleaks and found none.

[ilikemycar]

UPDATE : OEM Bosch plugs solved my issue.