E92 DCTThrottle Lag

[General.Massacre]

Hi all.

so ive had my 335i DCT N54 for around 3 months now. and its a great car, comfortable, quick.
my current only gripe is the throttle response, specifically when setting off from a standstill, there is a bit of push on the throttle pedal before the car actually starts moving,
when you coming to a stop, then have to set off again just before the car stops, there is major hesitation where there is little to no response for at least a full second.

i find myself struggling to get used to this "play" on the pedal, and its making me regret getting the car, specifically in DCT guise.

I know some guys have gotten the xHP or Alpina mods for their gearboxes, has this helped? does the MHD/JB4 help in this regard as well with the linear throttle mapping?

other than this issue, i really do love the car, just want to find out if its a common trait in the car, or normal?

thanks in advance all.

Juzzy

 

[ANiMOSiTY]

Awesome car and one of the best combinations of gearbox and engine you can get in an E9x-era x35i.
N54 is an absolute monster with small mods, so great choice of car if that's what you're after.

The DCT thing is a known issue though. They suffer from that especially if the car was rolling through second gear to a stop and then you want to pull-off again.
(I had one. 09 N54 DCT)
I trawled many forums - the only option seems to be to get hold of somebody with ISTA/P, or a friendly dealer, and make sure the box is running the latest software. Its a software bug in the earlier versions of that box in a 335.
N55s with DCT don't have this issue and the difference is the 'box software. So I'd try that.

 

[tr0jan]

I have an N55 DCT. And it too eventually suffers from the problem you described. A throttle position reset does the trick for me.

Try this, you cannot break anything....

Key Fob in and ignition turned on.
Foot flat on the throttle for 30 sec and then push the Start button (DO NOT press the clutch or brake pedals).
Leave everything as is for 2 minutes
and then ignition off - all done.

 

[General.Massacre]

Awesome car and one of the best combinations of gearbox and engine you can get in an E9x-era x35i.
N54 is an absolute monster with small mods, so great choice of car if that's what you're after.

The DCT thing is a known issue though. They suffer from that especially if the car was rolling through second gear to a stop and then you want to pull-off again.
(I had one. 09 N54 DCT)
I trawled many forums - the only option seems to be to get hold of somebody with ISTA/P, or a friendly dealer, and make sure the box is running the latest software. Its a software bug in the earlier versions of that box in a 335.
N55s with DCT don't have this issue and the difference is the 'box software. So I'd try that.

Howsit Animosity.
You are right, i have also trawled many DCT threads, and everyone posting about this issue has responses about it being a known issue. I did have my car booked in to JSN for a software update, apparantly they just plug the car in, and the car selects whats out of date, and just updates it, you dont specifically choose a DCT gearbox update and leave. or rather thats what i was told by JSN. i felt no change in the car after the software update, expect that my car no longer beeps when i lock and unlock it haha.

I have an N55 DCT. And it too eventually suffers from the problem you described. A throttle position reset does the trick for me.

Try this, you cannot break anything....

Key Fob in and ignition turned on.
Foot flat on the throttle for 30 sec and then push the Start button (DO NOT press the clutch or brake pedals).
Leave everything as is for 2 minutes
and then ignition off - all done.

I actually did this yesterday when i stopped at home.
slightly different.
1. FOB in, pushstart to ignition on.
2. gas pedal to the floor past kickdown for 30sec
3. press start to switch off, and FOB out.
4. started the car immediately after. gave it a rev, then switched it off, and started again this morning.

Car actually felt slight better, but i believe that may be the placebo effect, so im going to try do it correctly a bit later this afternoon just before i leave my client, then see how it feels.


Thanks for the responses gents, mmuch appreciated.[/quote]

 

[NFCKN'SANE]

Subscribed...
Also have this issue and learned to live with it...Interesting to know if this reset fix works... will also try it on the weekend and report back.

 

[peanut125i]

Gonna try this as well later. Though mine is N55. What bugs me about my car is sometimes when i break to come to a complete stop and the gears go from 3rd to 2nd to 1st there are jolts or surges and have to mash the break pedal down so don't drive into whatever it was I was stopping for. Agents said 'can't replicate the problem' so not much help there.

Sent from my SM-N910F using Tapatalk

 

[General.Massacre]

Gonna try this as well later. Though mine is N55. What bugs me about my car is sometimes when i break to come to a complete stop and the gears go from 3rd to 2nd to 1st there are jolts or surges and have to mash the break pedal down so don't drive into whatever it was I was stopping for. Agents said 'can't replicate the problem' so not much help there.

Sent from my SM-N910F using Tapatalk

does your issue happen all the time when breaking?
I got tired of being told by the JSN guy that he cant replicate my issues, so i told him to get out and get in the passenger seat, and i will drive how i drive. i managed to replicate some slight surging while driving at low gears and low speeds at cruising throttle, and i told themm to prepare the updated sooftware as im the customer and its what i want. they said "yes sir" :smilebounce:

So just tell them you want to check your software, and update it, the software index will show on your key printout.

 

[sash]

I actually did this yesterday when i stopped at home.
slightly different.
1. FOB in, pushstart to ignition on.
2. gas pedal to the floor past kickdown for 30sec
3. press start to switch off, and FOB out.
4. started the car immediately after. gave it a rev, then switched it off, and started again this morning.

Car actually felt slight better, but i believe that may be the placebo effect, so im going to try do it correctly a bit later this afternoon just before i leave my client, then see how it feels.


Thanks for the responses gents, mmuch appreciated.

[/quote]

Is this process similar to the adaptation reset on the 6spd autos?

 

[General.Massacre]

Apparently so, but the Gearbox and Throttle adaptations are two seperate items.
But im still reading into this, hopefully someone else will chime in here and give us the right info

 

[General.Massacre]

Hi all, would fitting a JB4 help with the throttle lag at all, or rather increase the throttle response?

 

[AlbertBrand]

Unfortunately I don't believe the JB4 will be much help with the DCT lag, as I believe this mostly down to the software on the DCT, which the JB4 doesn't really effect. However you can reset the TCU and see if this solves some of your problems. If someone is able to assist with INPA you can reset your parameters and check if it is better. Then you can also check the software level of your TCU and just check with BMW if it is in fact the latest.

 

[osiris]

I have this same issue and it only started a few weeks ago.

I started panicking thinking gearbox is konking out on me.

Funny thing is Carly is throwing an error on my transmission since this has started happening but the error is unknown.

Transmission / Getriebe GS 19
sorry, unknown fault
Code: 005139

Then Wednesday night I unplugging the battery for a few hours to hard reset everything and I got this error last night:
Code: 005A73

Which also doesn't exist on the net however I have a feeling it was because I stuffed up my steering wheel controls to the max and the paddleshift probably caused an error although I am not sure. I reset everything last night and will run diagnostics again.


MHD reports nothing, its just carly that is reporting this error.

I have a feeling the throttle adaptation reset might help but I haven't had the balls to try it yet as I have read some bad stuff about it going wrong.

I might try what you guys suggested and see if that helps.

Very annoying lag when coming to an intersection and trying to pull away if you haven't come to a complete standstill.

 

[General.Massacre]

I have this same issue and it only started a few weeks ago.

I started panicking thinking gearbox is konking out on me.

Funny thing is Carly is throwing an error on my transmission since this has started happening but the error is unknown.

Transmission / Getriebe GS 19
sorry, unknown fault
Code: 005139

Then Wednesday night I unplugging the battery for a few hours to hard reset everything and I got this error last night:
Code: 005A73

Which also doesn't exist on the net however I have a feeling it was because I stuffed up my steering wheel controls to the max and the paddleshift probably caused an error although I am not sure. I reset everything last night and will run diagnostics again.


MHD reports nothing, its just carly that is reporting this error.

I have a feeling the throttle adaptation reset might help but I haven't had the balls to try it yet as I have read some bad stuff about it going wrong.

I might try what you guys suggested and see if that helps.

Very annoying lag when coming to an intersection and trying to pull away if you haven't come to a complete standstill.

Hi bud,

Thats exactly it, I've done the throttle reset, its straight forward, and it felt crisp for a little bit,and then went back to the same feeling.
What bad things did you hear about the reset?

 

[osiris]

I have this same issue and it only started a few weeks ago.

I started panicking thinking gearbox is konking out on me.

Funny thing is Carly is throwing an error on my transmission since this has started happening but the error is unknown.

Transmission / Getriebe GS 19
sorry, unknown fault
Code: 005139

Then Wednesday night I unplugging the battery for a few hours to hard reset everything and I got this error last night:
Code: 005A73

Which also doesn't exist on the net however I have a feeling it was because I stuffed up my steering wheel controls to the max and the paddleshift probably caused an error although I am not sure. I reset everything last night and will run diagnostics again.


MHD reports nothing, its just carly that is reporting this error.

I have a feeling the throttle adaptation reset might help but I haven't had the balls to try it yet as I have read some bad stuff about it going wrong.

I might try what you guys suggested and see if that helps.

Very annoying lag when coming to an intersection and trying to pull away if you haven't come to a complete standstill.

Hi bud,

Thats exactly it, I've done the throttle reset, its straight forward, and it felt crisp for a little bit,and then went back to the same feeling.
What bad things did you hear about the reset?

I can't remember what things were said but it caused MHD to put a warning in the adaptation reset for the throttle position rest.
Apparently there is a specific way of doing it and if done wrong can cause havoc.

 

[AlbertBrand]

MHD reports nothing, its just carly that is reporting this error.

As far as I know MHD only looks at the ECU memory for stored faults, none of the other modules, so you would see it in Carly, but not with MHD or JB4. It should pop up if you use Rheingold or something similar. As to what exactly the error is, I can't say.

I can't remember what things were said but it caused MHD to put a warning in the adaptation reset for the throttle position rest.
Apparently there is a specific way of doing it and if done wrong can cause havoc.

http://www.e90post.com/forums/showthread.php?t=1096247&page=61

Apparently there are some issues after the adaptation reset, where you have to cycle the key, and clear the codes, otherwise fault codes are thrown, and the idle is erratic.

"You don't need a full write, but clear codes, ignition off, igntion on 30 sec. without starting the engine, then off again.

I still believe this will only be temporary since the DME will learn the throttle adaptation again.