Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.

Car Running Rough after MHD Stage 1+ Tune

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
Online
User avatar
spitfun
Member
Member
Posts: 84
Joined: Tue Oct 18, 2022 11:54 am

Car Running Rough after MHD Stage 1+ Tune

Post by spitfun » Wed Jan 25, 2023 5:57 am

I flashed my car over the weekend with the MHD Stage 1+. Everything seemed to go fine-it said "successful' at the end and the car started right up. I took it out for the first ride today,let it warm up (about 200 degrees for the oil),I did a WOT to 6.5k in 2nd getting on the highway and hit 3rd-then the engine light came on and it ran rough and seemed like it was running on 5 cylinders,I babied it home and turned the car off. About an hour later I went back out and started her up and the engine light is off and she idles fines,you guys have any ideas how it fixed itself? The only other thing I did before that first drive was to install a larger intercooler,it seems like if it was a bad coil or spark plug it would still be running rough-although I did order new Eldor coils and 2 sets of spark plugs (OEM Bosch and NGK 1 step colder) that I will install to just start with new ones...
Last edited by spitfun on Wed Jan 25, 2023 10:08 am, edited 2 times in total.
2012 Z4 Sdrive35i M Sport

User avatar
tiglon
Member
Member
Posts: 878
Joined: Mon Jun 24, 2019 11:20 am
Location: Essex

Car Running Rough after MHD Stage 1+ Tune

Post by tiglon » Wed Jan 25, 2023 9:31 am

I would guess a coil. Exactly the same happened with mine after remapping.
2014 E89 35is Valencia Orange 788M wheels (M2 Competition), E90 M3 control arms, Eibach Pro Kit Springs, MHD Stage 1

User avatar
B21
Senior Member
Senior Member
Posts: 2978
Joined: Tue Oct 05, 2021 7:15 pm
Location: It never rains in Southern Caledonia

Car Running Rough after MHD Stage 1+ Tune

Post by B21 » Wed Jan 25, 2023 10:32 am

When you flash MHD v9 or V10 it does seem to find any issues with coils or plugs..

This happened to me on one coil…I replaced all the coils n plugs and narrowed the gaps and issue went away..

The misfire, engine light on, then reset when restarted is all standard N54 DME management logic..

As usual decent code reader will show which cylinder (s) are at fault. :thumbsup:

Modded E89 20i MSport 2017-2022…Even more modded E89 35is 2021 onwards..details here.. https://www.dropbox.com/s/8h1vabklgzf4v ... t.pdf?dl=0


Image

Online
User avatar
spitfun
Member
Member
Posts: 84
Joined: Tue Oct 18, 2022 11:54 am

Car Running Rough after MHD Stage 1+ Tune

Post by spitfun » Wed Jan 25, 2023 10:43 am

I did go with v10,I figured why not put the latest version in. Thanks for the info...
2012 Z4 Sdrive35i M Sport

User avatar
B21
Senior Member
Senior Member
Posts: 2978
Joined: Tue Oct 05, 2021 7:15 pm
Location: It never rains in Southern Caledonia

Car Running Rough after MHD Stage 1+ Tune

Post by B21 » Wed Jan 25, 2023 12:25 pm

spitfun wrote: Wed Jan 25, 2023 10:43 am I did go with v10,I figured why not put the latest version in. Thanks for the info...

With 400 ish BHP and 650nm torque it’s pushing the physical and electrical limits of the stock components….

Modded E89 20i MSport 2017-2022…Even more modded E89 35is 2021 onwards..details here.. https://www.dropbox.com/s/8h1vabklgzf4v ... t.pdf?dl=0


Image

Online
User avatar
spitfun
Member
Member
Posts: 84
Joined: Tue Oct 18, 2022 11:54 am

Car Running Rough after MHD Stage 1+ Tune

Post by spitfun » Wed Jan 25, 2023 12:34 pm

Now you're scaring me... Should I drop down to stage 1? I only drive it on the street and an occasional autocross
2012 Z4 Sdrive35i M Sport

User avatar
B21
Senior Member
Senior Member
Posts: 2978
Joined: Tue Oct 05, 2021 7:15 pm
Location: It never rains in Southern Caledonia

Car Running Rough after MHD Stage 1+ Tune

Post by B21 » Wed Jan 25, 2023 12:37 pm

spitfun wrote: Wed Jan 25, 2023 12:34 pm Now you're scaring me...
Not really..it was a 300 BHP 450nm motor and with the 35is they pushed it to 335 ish BHP with an over boost taking it to 500nm…

So 400 BHP is 33% up on the ‘true’ reference line…also the MHD V10 version rolls a lot more torque in early which will put much more strain on plugs n coils…not to mention issues like LSPI etc…

Modded E89 20i MSport 2017-2022…Even more modded E89 35is 2021 onwards..details here.. https://www.dropbox.com/s/8h1vabklgzf4v ... t.pdf?dl=0


Image

Online
User avatar
spitfun
Member
Member
Posts: 84
Joined: Tue Oct 18, 2022 11:54 am

Car Running Rough after MHD Stage 1+ Tune

Post by spitfun » Wed Jan 25, 2023 12:42 pm

Stage 1 better choice?
2012 Z4 Sdrive35i M Sport

User avatar
B21
Senior Member
Senior Member
Posts: 2978
Joined: Tue Oct 05, 2021 7:15 pm
Location: It never rains in Southern Caledonia

Car Running Rough after MHD Stage 1+ Tune

Post by B21 » Wed Jan 25, 2023 1:08 pm

Lesser tunes put lesser strain on components…

I’d suggest it’s just being more conscious of what’s happening in the engine…

Twin turbo N54s generate large amounts of torque low down..lugging the engine whilst asking for big torque induces greater strains on the engine..hence the rise of low speed pre ignition on turbo’d engines with auto boxes shifting to high gears at low rpm..

Personally if I’m ‘poodling’ I leave it in comfort mode and don’t prod the throttle too aggressively..makes more than adequate progress most of the time..

If I want to ‘press on’ I put the box in sport / manual mode and spin the engine a bit more…

Seems a bit like unnecessary concern for the engine..but if you had a NA car that was tuned then for sure you’d spin it to get more progress..

Modded E89 20i MSport 2017-2022…Even more modded E89 35is 2021 onwards..details here.. https://www.dropbox.com/s/8h1vabklgzf4v ... t.pdf?dl=0


Image

mcbutler
Senior Member
Senior Member
Posts: 2421
Joined: Fri May 26, 2017 3:40 pm
Location: Plymouth

Car Running Rough after MHD Stage 1+ Tune

Post by mcbutler » Wed Jan 25, 2023 1:21 pm

spitfun wrote: Wed Jan 25, 2023 12:34 pm Now you're scaring me... Should I drop down to stage 1? I only drive it on the street and an occasional autocross
NO go stage 2, perfectly fine on stock. I have enquired many times with tuning companies ref upgraded coil packs etc and they are all very clear that at 400/450 you are not even really near needing them.
My 35i has done around 6k on full MHD tune and full XHP map on the DCT, upgraded downpipes, intercooler etc and its more than enough... MHD can analyse your car as well, try doing a live data run, if the error reoccurs send the result to MHD, also try posting in on their FB page, they are very helpful and an absolute mine of highly qualified tuning brains...
Mark
Plymouth
E89
35i
Carmine Red
Black leather

User avatar
B21
Senior Member
Senior Member
Posts: 2978
Joined: Tue Oct 05, 2021 7:15 pm
Location: It never rains in Southern Caledonia

Car Running Rough after MHD Stage 1+ Tune

Post by B21 » Wed Jan 25, 2023 1:22 pm

Here are a few charts showing 35is stock vs V9 and V10 and effect of no filter etc.. enjoy..
Attachments
stock vs mhd stage 2+ v10 no airbox or filter subtract 8 bhp and 5 nm for airbox and filter.jpg
stock vs mhd stage 2+ v10 no airbox or filter subtract 8 bhp and 5 nm for airbox and filter.jpg (82.45 KiB) Viewed 112 times
mhd v9 stage 2+ vs v10 stage 2+ stock airbox filter ngk plugs 1 stage colder b58 coils ron98 index 12 injectors 55k miles.jpg
mhd v9 stage 2+ vs v10 stage 2+ stock airbox filter ngk plugs 1 stage colder b58 coils ron98 index 12 injectors 55k miles.jpg (83.39 KiB) Viewed 112 times
stock vs mhd stage 1+ v9 vs mhd stage2+ v10 no airbox box or filter.jpg
stock vs mhd stage 1+ v9 vs mhd stage2+ v10 no airbox box or filter.jpg (95.51 KiB) Viewed 112 times

Modded E89 20i MSport 2017-2022…Even more modded E89 35is 2021 onwards..details here.. https://www.dropbox.com/s/8h1vabklgzf4v ... t.pdf?dl=0


Image

User avatar
B21
Senior Member
Senior Member
Posts: 2978
Joined: Tue Oct 05, 2021 7:15 pm
Location: It never rains in Southern Caledonia

Car Running Rough after MHD Stage 1+ Tune

Post by B21 » Wed Jan 25, 2023 1:31 pm

You may want to look at this article and associated ones..good bed time reading..

https://bmwtuning.co/n54-tuning-guide-beginners/

Modded E89 20i MSport 2017-2022…Even more modded E89 35is 2021 onwards..details here.. https://www.dropbox.com/s/8h1vabklgzf4v ... t.pdf?dl=0


Image

Online
User avatar
spitfun
Member
Member
Posts: 84
Joined: Tue Oct 18, 2022 11:54 am

Car Running Rough after MHD Stage 1+ Tune

Post by spitfun » Wed Jan 25, 2023 1:45 pm

I just scanned the car,looks like misfire cylinder #4 was the culprit.
20230125_054457.jpg
20230125_054457.jpg (164.17 KiB) Viewed 97 times
2012 Z4 Sdrive35i M Sport

User avatar
B21
Senior Member
Senior Member
Posts: 2978
Joined: Tue Oct 05, 2021 7:15 pm
Location: It never rains in Southern Caledonia

Car Running Rough after MHD Stage 1+ Tune

Post by B21 » Wed Jan 25, 2023 1:50 pm

If you are getting a fresh set of plugs n coils thats the best move..just fit them and maybe close the plu gaps up a bit from stock..22 thou to 25 thou..you can start stock gaps at 30 thou and narrow till misfire ceases..each car is a seperate case at this level of tune..

Have you had the inlets de-coked or checked?

Modded E89 20i MSport 2017-2022…Even more modded E89 35is 2021 onwards..details here.. https://www.dropbox.com/s/8h1vabklgzf4v ... t.pdf?dl=0


Image

Online
User avatar
spitfun
Member
Member
Posts: 84
Joined: Tue Oct 18, 2022 11:54 am

Car Running Rough after MHD Stage 1+ Tune

Post by spitfun » Wed Jan 25, 2023 3:11 pm

What inlets?? I just bought this car a few months,excuse my ignorance. I have done the suspension so far,just getting to the engine. The car has 110k on it,so alot of components may be original...
2012 Z4 Sdrive35i M Sport

Post Reply