[Quick335XI]

Originally Posted by Sgop335

Looks good, its the wgdc bank % so its up there...

Thank. Damn I may already need a bigger turbo lol

[vadonchez]

Originally Posted by lowrydr310

I get the same thing, 'mid-heavy throttle' is exactly when it happens. I have an auto transmission and when I left off abruptly in second gear that's when I feel it most, though I wouldn't describe it as a 'bang' more of an aggressive jerk that definitely doesn't feel healthy for the drivetrain. If I take it above 6000 RPMs and let off the throttle it doesn't happen, also doesn't happen in 3rd (or higher) gears.

The post you linked above had a reply that said:

That's not correct and is definitely not normal, at least for what I'm experiencing. I know what engine braking feels like even from high RPMs and this feeling is not that. I have MHD v3.20 (Android) V10,0 Map - Stage 1 ACN91, no burbles, stock downpipes.

Hi,

I have thé same problem with V10 stage 2 using MHD+ and linear throttle.

No problem with v9....

V10 has definitly some serious problem !

Time for an update version!!

[lowrydr310]

I posted some of my logs a while back and still have some questions about timing corrections and fuel trims. I'm seeing timing corrections across all cylinders.

https://datazap.me/u/lowrydr310/log-...4&zoom=127-250

There's a big discrepancy between bank 1 and bank 2 fuel trims, both short term and long term. Long and short trims for bank 1 are much more negative than those for bank 2. All maintenance is good (coils/plugs, good quality fuel, new LPFP and pressure sensor) the only not so good thing are the injectors.

Bank 1 has three original index 1s with 160K miles.
Bank 2 has two used index 12s from a wrecked car that was running well, and one Index 9.

So either those Index 1s in Bank 1 are dumping too much fuel, or the bank 2 injectors aren't delivering enough fuel. How can I tell the difference? Would injector issues cause timing corrections?

Also, after looking at some of the other logs posted on this thread I realized I should really get a new intercooler. I have the stock intercooler and I'm seeing 25 degree increases in some cases just over a second gear pull.

[Shige671]

I'm still learning to read datalog. I'm running 07 bmw 335i with jb4, mhd, xhp flasher, pedalcommander stage 2lphp, index 12 injectors. 2 cone intake. PR inductive coil. Catless downpipe with muffler delete & viva stage 2 turbo with FMIC & 50mm tial blow off valveUsing 87oct. Still bogs when take off it bogs then it start pulling when turbo kicks in.

Can you tell me how does my data log

[LastGray]

Originally Posted by lowrydr310

I get the same thing, 'mid-heavy throttle' is exactly when it happens. I have an auto transmission and when I left off abruptly in second gear that's when I feel it most, though I wouldn't describe it as a 'bang' more of an aggressive jerk that definitely doesn't feel healthy for the drivetrain. If I take it above 6000 RPMs and let off the throttle it doesn't happen, also doesn't happen in 3rd (or higher) gears.
The post you linked above had a reply that said:

That's not correct and is definitely not normal, at least for what I'm experiencing. I know what engine braking feels like even from high RPMs and this feeling is not that. I have MHD v3.20 (Android) V10,0 Map - Stage 1 ACN91, no burbles, stock downpipes.

It’s definitely a software issue. There are other threads which describe this and everyone who encountered this symptom did so after the MHD+ updates. 100% the tune. I’ve owned highly tuned JDMs and definitely drove every iteration of MHD from v7 till the v10+. This is not normal and it’s a very binary symptom before and after v10+.

Here’s another user reporting from 2 years ago.
https://www.e90post.com/forums/showthread.php?t=1972983

[LastGray]

Originally Posted by lowrydr310

see below

Originally Posted by vadonchez

see below

Originally Posted by cheahcl

see below

I have reached out to MHD on this and told them I could live without the map-switching but would rather have a stable v10 with 1M throttle tuning. Their recommendation was to download a previous (Android only) version from https://apkpure.com/mhd-flasher-n54/...r.n54/versions

Today, I removed the current MHD v3.20 (Long Write back to stock) and reinstalled v2.41. First impressions are the post mid-throttle surge is gone and the car works like it should. Revs no longer fling themselves up another 500rpm after I clutch in during gear changes. That horrible lurch and driveline shock no longer happens when I suddenly lift off mid-throttle. I’ll report back if the v3.2 symptoms reappear. Else, this is the solution for me.

[vadonchez]

Ok thats a good news even if MHD multimap is important for me as i Can run ethanol mix dayli but keep possibility to Switch to gaz map if ethanol should not be able during a roadtrip for example.

If it works fine you could make a Feedback @jake and wedge and hope for a MHD version update.

Let us know if everything is still ok After few hundred miles with v2.41.

[lowrydr310]

Originally Posted by LastGray

I have reached out to MHD on this and told them I could live without the map-switching but would rather have a stable v10 with 1M throttle tuning. Their recommendation was to download a previous (Android only) version from https://apkpure.com/mhd-flasher-n54/...r.n54/versions

Today, I removed the current MHD v3.20 (Long Write back to stock) and reinstalled v2.41. First impressions are the post mid-throttle surge is gone and the car works like it should. Revs no longer fling themselves up another 500rpm after I clutch in during gear changes. That horrible lurch and driveline shock no longer happens when I suddenly lift off mid-throttle. I’ll report back if the v3.2 symptoms reappear. Else, this is the solution for me.

The version of MHD that you used fixed the issue? I'm not sure I understand how that works, especially if the maps are identical. You flashed a V10 map using the older version of MHD and that surge is fixed?

[smass]

Originally Posted by LastGray

I’ve been experiencing symptoms similar to what’s mentioned on this threadhttps://www.e90post.com/forums/showthread.php?t=1972983.

My Data log : https://datazap.me/u/zackie51/mhd-v1...og=0&data=3-16

Problem description : during mid-heavy throttle input there’s a massive jerk/knock/bang as soon as I lift off the throttle. Since mine’s a 6MT I can avoid the jerk by clutching in but I still notice the revs still shooting up even AFTER I lift off. From the logs you can see that it’s not because my foot is still on the throttle while stepping on the clutch, but something seems to keep the RPMs climbing and also maintaining boost.

Other notes : Pull was done in 4th gear because to the best condition to simulate this was during a prolonged heavy load. My mods are a charge pipe with Turbosmart Dualports and a VSRF 5.5” HD intercooler. MHD+ v10 Stage 1+ map. 1M throttle set to 30%. Turning it off makes no difference. Pops and bangs and anti-lag are off. Even at 70% power for the map, it still happens. Totally alleviated once I do a full restore to stock maps (not Stage 0).

This did not happen when I was on the pre MHD+ maps before app v3.00 (similar to the case in the link above) with the exact same settings.

I’d like to know if anyone faced this issue as well and did it get resolved? If yes, please let me know what was done.

I have the same issue w/ V10. But it is on my 8 speed swapped 335i. I went back to stock and it went away. But I was unsure if it was related to the higher torque of the tune. The jerk almost feels like driveline twist and unwrap. Thanks to TiAgAu for sending me here. I was about to waste a bunch of time checking things under the car. I will flash 9 and see if it goes away unless someone has a better idea.

[LastGray]

Update on v2.41 (Android) and 200miles of driving.

I have been trying hard to emulate it and while it is not 100% gone, it feels more like a torque lump rather than v3.x’s outright driveline shock as if someone hit the pedal immediately after you lifted quickly at >40% throttle.

Mind you, I’ve also set my 1M throttle lag setting to 40%. While I love the throttle response, I’ll experiment with 30% to see if it diminishes the lift-off surge further into the negligible.

[ToXiC]

Would appreciate some help diagnosing this misfire

https://datazap.me/u/tox/n54-misfire...20&zoom=79-145

I first started getting misfires on cyl1 (29CD) so I just swapped the coil pack to cyl2, now it looks like I'm getting a misfire on cylinder 4 instead (29D0).

I have brand new spark plugs, running MHD stage 1 91 (with 93 in the tank), catless dp, DCI.

Coils are original so I was planning on replacing them anyways, but didn't want to cover up a potentially more serious issue (or ruin a new set) if there's something else going on. The rail pressure drop and spike in AFR has me wondering if its a HPFP or injector issue..

[Nabes]

Can someone look at these logs? Trying to help a friend diagnose an issue with losing boost pressure toward the end of a pull. Only codes he gets are O2 codes. Could it be just that simple, O2 sensors? I'm concerned with his wgdc looking too high for too long, and also dropping some rail pressure psi when it starts to lose boost.

https://datazap.me/u/t0ymach1n3/log-...og=0&data=3-21
https://datazap.me/u/t0ymach1n3/log-...0&data=3-21-29

[vadonchez]

Originally Posted by Nabes

Can someone look at these logs? Trying to help a friend diagnose an issue with losing boost pressure toward the end of a pull. Only codes he gets are O2 codes. Could it be just that simple, O2 sensors? I'm concerned with his wgdc looking too high for too long, and also dropping some rail pressure psi when it starts to lose boost.

https://datazap.me/u/t0ymach1n3/log-...og=0&data=3-21
https://datazap.me/u/t0ymach1n3/log-...0&data=3-21-29

Major boost leak.
Too much time to reach boost target make DME ask for 100% WGDC too long then wgdc stay high to keep only 14psi @ low rpm.
Around 3500rpm HPFP pressure fall and STFT reach +20%, maybe normal because of low boost so no need for lot of fuel but could be another problem too.

I will start by looking at boost leak by making a smoke test.

[vadonchez]

Originally Posted by ToXiC

Would appreciate some help diagnosing this misfire

https://datazap.me/u/tox/n54-misfire...20&zoom=79-145

I first started getting misfires on cyl1 (29CD) so I just swapped the coil pack to cyl2, now it looks like I'm getting a misfire on cylinder 4 instead (29D0).

I have brand new spark plugs, running MHD stage 1 91 (with 93 in the tank), catless dp, DCI.

Coils are original so I was planning on replacing them anyways, but didn't want to cover up a potentially more serious issue (or ruin a new set) if there's something else going on. The rail pressure drop and spike in AFR has me wondering if its a HPFP or injector issue..

AFR spikes during WOT on BANK2 make me thinking about a bad O2 sensor resulting into an eratic STFT on bank2 too.During this pikes you're running lean and that could cause missfire.

I don't think that you have a leaky injector because AFR reach 234 value on both bank after pedale release.