DCT slam

dparm · 03-19-2014, 01:52 PM

Okay, fine, everyone's definition of manual/automatic is a bit different.

My point was more that there are still clutches being engaged and disengaged in a manner similar to a 3-pedal car. It's simply not going to be as smooth as a torque converter.

dparm · 03-19-2014, 01:56 PM

Quote:

Originally Posted by grantmax

Sounds like an SMG shift. You may need to be re-calibrated or have your adaptations reset.

If you're under warranty, off to the stealer you go. If not, go find your favorite shop and pay for 30 minutes of their time.

Any idea if this is doable with that BMWhat iOS app + Bluetooth/wifi/OBD2 adapter?

grantmax · 03-19-2014, 03:25 PM

Quote:

Originally Posted by dparm

Any idea if this is doable with that BMWhat iOS app + Bluetooth/wifi/OBD2 adapter?

I can't say for certain.

BaseM3 · 08-16-2014, 08:28 AM

Just got off I95 sitting at a stop light in D3 and WHAM-WHAM-WHAM!
It slammed so hard and shook the car that it scared the hell out of me and my wife enough that I thought someone rear ended me

Driving away it shifted harder than normal going through the gears but calmed after a few miles.
I know if I take it to the dealer I'll get the same ole song and dance about not being able to replicate it because it happens so rarely. How will I know if there it a transmission code? Will it display a CEL light?

I've also noticed that rounding curves in 2nd gear auto mode that there is a slight lag before the gear engages.
This is a 11.5 (20K miles) model. I've read where this was an issue in earlier models. Shouldn't this lag been reprogramed out by my production date?

AMG_LAWL · 08-16-2014, 11:05 AM

Try to lower your DCT shift aggressiveness by using the button below your knob. The shift setting shouldn't be at its highest if you are normally driving. I keep mine at one below the highest and I get perfect/smooth shifts every time. If you want the "slam" factor, you would want to raise your shift setting all the way up.

Thats just my 2 cents lol

///M Power-Belgium · 08-16-2014, 11:11 AM

Quote:

Originally Posted by BaseM3

Just got off I95 sitting at a stop light in D3 and WHAM-WHAM-WHAM!
It slammed so hard and shook the car that it scared the hell out of me and my wife enough that I thought someone rear ended me

Driving away it shifted harder than normal going through the gears but calmed after a few miles.
I know if I take it to the dealer I'll get the same ole song and dance about not being able to replicate it because it happens so rarely. How will I know if there it a transmission code? Will it display a CEL light?

I've also noticed that rounding curves in 2nd gear auto mode that there is a slight lag before the gear engages.
This is a 11.5 (20K miles) model. I've read where this was an issue in earlier models. Shouldn't this lag been reprogramed out by my production date?

Your problem is what we are calling "The 2nd gear lag" !
It's a general problem with our DCT transmission , when driving in D3 in third gear and slowing down there is sometimes or often...depends, a delay when going into the second gear ,and how longer the delay...so the lag...the bigger the slamming feeling is of the lag when going into the lower shift gear !
And exactly this is your....WHAM !

This lag can create dangerous situations in traffic,because the car actualy slow down but without stop lights and when there is a car shorter behind you...than we need good luck and I know it,because I had also the 2nd gear lag,and when the DCT is not warmed up,it's even worse !

The fix....The solution....
I took my car 4 times at my BMW/Dealer ..and yes they know exactly what the second gear is...
But....
They will say...Your car needs updates !
So after 4 times it was better,... but still there !
After the updates I was thinking by myself.....it's enough !
Next was this forum, and saw the BPM/Tune(Mike-Benvo) and all the positive reactions of it, and thought....why not,we will see... !
So for me personal it was Mike's BPM engine DEV tune and DCT sofware upgrade the ultimate solution for the second gear lag,shifts are much smoother and a lot faster !
Conclusion...
The 2nd gear was history...never felt it again !
Our cars should have this software out of the factory...no doubt !
Hope this will help

Amirsm3 · 08-16-2014, 11:11 AM

Quote:

Originally Posted by AMG_LAWL

Try to lower your DCT shift aggressiveness by using the button below your knob. The shift setting shouldn't be at its highest if you are normally driving. I keep mine at one below the highest and I get perfect/smooth shifts every time. If you want the "slam" factor, you would want to raise your shift setting all the way up.

Thats just my 2 cents lol

He's in D3. That's moderate shift aggression and shouldn't be "slamming" into gears - unless the OP's definition of slamming is more of an over exaggeration.

AMG_LAWL · 08-16-2014, 11:13 AM

Quote:

Originally Posted by Amirsm3

He's in D3. That's moderate shift aggression and shouldn't be "slamming" into gears - unless the OP's definition of slamming is more of an over exaggeration.

I thought D3 just meant that you are in Drive and in 3rd gear? Isnt the shift aggressiveness different?

///M Power-Belgium · 08-16-2014, 11:31 AM

Quote:

Originally Posted by Amirsm3

He's in D3. That's moderate shift aggression and shouldn't be "slamming" into gears - unless the OP's definition of slamming is more of an over exaggeration.

Think OP was driving in D/Mode and in third gear

///M Power-Belgium · 08-16-2014, 11:37 AM

Quote:

Originally Posted by AMG_LAWL

I thought D3 just meant that you are in Drive and in 3rd gear? Isnt the shift aggressiveness different?

Exactly !
We need also to know in what speed/shift OP was driving .
When he was driving in D3 so in Drive and in third gear with speed/shift setting into 2 or 3 and gets the slam after the delay, i'm almost sure it's the second gear lag !

BaseM3 · 08-16-2014, 11:49 AM

Quote:

Originally Posted by ///M Power-Belgium

Your problem is what we are calling "The 2nd gear lag" !
It's a general problem with our DCT transmission , when driving in D3 in third gear and slowing down there is sometimes or often...depends, a delay when going into the second gear ,and how longer the delay...so the lag...the bigger the slamming feeling is of the lag when going into the lower shift gear !
And exactly this is your....WHAM !

This lag can create dangerous situations in traffic,because the car actualy slow down but without stop lights and when there is a car shorter behind you...than we need good luck and I know it,because I had also the 2nd gear lag,and when the DCT is not warmed up,it's even worse !

The fix....The solution....
I took my car 4 times at my BMW/Dealer ..and yes they know exactly what the second gear is...
But....
They will say...Your car needs updates !
So after 4 times it was better,... but still there !
After the updates I was thinking by myself.....it's enough !
Next was this forum, and saw the BPM/Tune(Mike-Benvo) and all the positive reactions of it, and thought....why not,we will see... !
So for me personal it was Mike's BPM engine DEV tune and DCT sofware upgrade the ultimate solution for the second gear lag,shifts are much smoother and a lot faster !
Conclusion...
The 2nd gear was history...never felt it again !
Our cars should have this software out of the factory...no doubt !
Hope this will help

I was completely stopped at an intersection when this happened.
Car was in D mode in the 3rd setting in the selector on the center counsel. Dash indicator said D1 so it wasn't down shifting causing the slamming. It was very violent like someone had hit me...
The only lag I get is when starting in the morning I have to push the pedal 1/2 way to get the car moving.

SenorFunkyPants · 08-16-2014, 11:53 AM

I've had it once in the last 5 years, a month or two ago...its like an instant downshift with no rev match or possibly the DCT park brake trying to engage for an instant.. Hasn't done it again so I put it down to some weird once in a lifetime combination of events. If it keeps happening then a trip to the dealer for a software update would be on the cards.

///M Power-Belgium · 08-16-2014, 11:59 AM

Quote:

Originally Posted by BaseM3

I was completely stopped at an intersection when this happened.
Car was in D mode in the 3rd setting in the selector on the center counsel. Dash indicator said D1 so it wasn't down shifting causing the slamming. It was very violent like someone had hit me...
The only lag I get is when starting in the morning I have to push the pedal 1/2 way to get the car moving.

So when I get this right...
You was completely stopped and your car is at 0 mph with your foot on the brake pedal , and after you got this DCT slam ?
When yes...after about how many time in secondes after completely stopping the car ?

Amirsm3 · 08-16-2014, 12:00 PM

Quote:

Originally Posted by ///M Power-Belgium

Think OP was driving in D/Mode and in third gear

I...I don't even know anymore, lol we used to refer to D3 and S3 etc. etc. on the other M3 forum for SMG users.

BaseM3 · 08-16-2014, 12:06 PM

Quote:

Originally Posted by ///M Power-Belgium

So when I get this right...
You was completely stopped and your car is at 0 mph with your foot on the brake pedal , and after you got this DCT slam ?
When yes...after about how many time in secondes after completely stopping the car ?

Yes completely stopped for about 10 sec. at least. Foot on the break.

Amirsm3 · 08-16-2014, 12:14 PM

Quote:

Originally Posted by BaseM3

Yes completely stopped for about 10 sec. at least. Foot on the break.

Your car was stopped for ten seconds when you heard the DCT slam into gear?

///M Power-Belgium · 08-16-2014, 12:18 PM

Quote:

Originally Posted by BaseM3

Yes completely stopped for about 10 sec. at least. Foot on the break.

WOW !!! Now i'm 100 % agreed with you ! That's not normal, no way !
Personal I would call my BMW/Dealer and that ASAP !
Probably software malfunction,because the DCT is acting and you was doing nothing ?
Actualy this can create dangerous situations in traffic !
But i'm very curious to know what this could be ?
When possible please post... let us know....

Ludey · 08-16-2014, 12:19 PM

Quote:

Originally Posted by BaseM3

Yes completely stopped for about 10 sec. at least. Foot on the break.

Did it lurch forward when it slammed into gear?

This is a very unusual problem and something you need to get addressed. Take that car to the dealer, explain what happened, and communicate the seriousness of the issue.

BaseM3 · 08-16-2014, 12:45 PM

Quote:

Originally Posted by Ludey

Did it lurch forward when it slammed into gear?

This is a very unusual problem and something you need to get addressed. Take that car to the dealer, explain what happened, and communicate the seriousness of the issue.

Have a call in now waiting for a reply from the SA.
I tried to replicate the issue this morning following the exact same route and conditions and of course it worked fine.

fivaxis · 08-16-2014, 10:11 PM

One night mine slammed 3 or 4 times taking off from stoplights, I was in s5. It hasn't done it since but I usually drive in d4 or d5.

m3ray · 08-16-2014, 10:28 PM

Quote:

Originally Posted by ///M Power-Belgium

The general problem is DCT transmission

I agree

mmuller · 08-16-2014, 10:52 PM

I had a very similar issue to this in my 2011. Very harsh 2-3-2 gear changes in D3 or D4. I took it to the dealer and the next day got a call that the BMW area rep had come and driven my car and I was getting a new transmission as a result. The car had 26k miles on it at the time. 3k miles later, the car appears to be operating fine.

Good luck to the OP. My transmission was replaced 2 months before the end of my warranty which I sure was happy to avoid the $22k charge that went to BMW USA as a result!

03-19-2014, 01:52 PM	#23
dparm Stop the hate, get a V8 3850 Rep 8,625 Posts Drives: C7 Corvette GS, AMG C63 S Join Date: Jun 2013 Location: Frisco, TX iTrader: (1)	Okay, fine, everyone's definition of manual/automatic is a bit different. My point was more that there are still clutches being engaged and disengaged in a manner similar to a 3-pedal car. It's simply not going to be as smooth as a torque converter. __________________ Now: 2017 Corvette Grand Sport, 2021 AMG C63 S sedan Past: 2011.5 M3 sedan ZCP
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08-16-2014, 08:28 AM	#26
BaseM3 Second Lieutenant 42 Rep 213 Posts Drives: 2011 Space Grey M3 Join Date: Jan 2012 Location: Jacksonville fl iTrader: (1)	DCT Slammed again! Big time! Just got off I95 sitting at a stop light in D3 and WHAM-WHAM-WHAM! It slammed so hard and shook the car that it scared the hell out of me and my wife enough that I thought someone rear ended me Driving away it shifted harder than normal going through the gears but calmed after a few miles. I know if I take it to the dealer I'll get the same ole song and dance about not being able to replicate it because it happens so rarely. How will I know if there it a transmission code? Will it display a CEL light? I've also noticed that rounding curves in 2nd gear auto mode that there is a slight lag before the gear engages. This is a 11.5 (20K miles) model. I've read where this was an issue in earlier models. Shouldn't this lag been reprogramed out by my production date? __________________ 11 Space Grey, M-DCT Base M3
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08-16-2014, 11:05 AM	#27
AMG_LAWL E92 M3 99 Rep 508 Posts Drives: (2) E92 M3's & F30 320i Join Date: Jun 2011 Location: Playa Vista, CA iTrader: (0) Garage List 2016 BMW 320i [0.00]	Try to lower your DCT shift aggressiveness by using the button below your knob. The shift setting shouldn't be at its highest if you are normally driving. I keep mine at one below the highest and I get perfect/smooth shifts every time. If you want the "slam" factor, you would want to raise your shift setting all the way up. Thats just my 2 cents lol
	Appreciate 0 Quote

08-16-2014, 11:53 AM	#34
SenorFunkyPants Brigadier General 2511 Rep 4,381 Posts Drives: 2019 M5 Join Date: Mar 2009 Location: UK iTrader: (0)	I've had it once in the last 5 years, a month or two ago...its like an instant downshift with no rev match or possibly the DCT park brake trying to engage for an instant.. Hasn't done it again so I put it down to some weird once in a lifetime combination of events. If it keeps happening then a trip to the dealer for a software update would be on the cards.
	Appreciate 0 Quote

08-16-2014, 10:11 PM	#42
fivaxis Private First Class 51 Rep 100 Posts Drives: 2017 M4 competition, 2010 M3 Join Date: Aug 2014 Location: Phoenix iTrader: (0)	One night mine slammed 3 or 4 times taking off from stoplights, I was in s5. It hasn't done it since but I usually drive in d4 or d5.
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08-16-2014, 10:52 PM	#44
mmuller New Member 27 Rep 15 Posts Drives: E90 M3 Join Date: Aug 2013 Location: United States iTrader: (1)	I had a very similar issue to this in my 2011. Very harsh 2-3-2 gear changes in D3 or D4. I took it to the dealer and the next day got a call that the BMW area rep had come and driven my car and I was getting a new transmission as a result. The car had 26k miles on it at the time. 3k miles later, the car appears to be operating fine. Good luck to the OP. My transmission was replaced 2 months before the end of my warranty which I sure was happy to avoid the $22k charge that went to BMW USA as a result!
	Appreciate 0 Quote