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      10-31-2017, 11:22 AM   #1
Radartrap
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DCT concerns

My '15 F82 M4 coupe with DCT has ~7,500 miles. Three concerns:

1. When starting from cold (overnight or longer, any weather), there's a lag of 1 to 1.5 seconds to get the car moving forward or backward in D or R. If I give it more than a little gas, it lurches. Problem disappears within a mile of driving.

2. When driving in D, transmission sometimes clunks when it shifts down approaching a traffic light.

3. When driving in full automatic mode, I'll occasionally hear engine revving. Cause: transmission has gone into the manual shift mode--display on tach shows the gear I'm in, not "D." This happens randomly but not infrequently. I'm certain I haven't accidentally touched the paddle shifters or the console shift lever.

Advice? Thanks.
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      10-31-2017, 11:29 AM   #2
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Quote:
Originally Posted by Radartrap View Post
My '15 F82 M4 coupe with DCT has ~7,500 miles. Three concerns:

1. When starting from cold (overnight or longer, any weather), there's a lag of 1 to 1.5 seconds to get the car moving forward or backward in D or R. If I give it more than a little gas, it lurches. Problem disappears within a mile of driving.

2. When driving in D, transmission sometimes clunks when it shifts down approaching a traffic light.

3. When driving in full automatic mode, I'll occasionally hear engine revving. Cause: transmission has gone into the manual shift mode--display on tach shows the gear I'm in, not "D." This happens randomly but not infrequently. I'm certain I haven't accidentally touched the paddle shifters or the console shift lever.

Advice? Thanks.
What about the M buttons ?
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      10-31-2017, 11:32 AM   #3
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I have a 2018 DCT, and my experience has been:

1) Normal. Cold clutches. Yes, it still has normal clutches, in fact two of them, so can be a bit grumpy and grabby when cold.
2) Normal. Especially if in aggressive shift mode.
3) You probably nudged the shifter into manual mode or grabbed a paddle and didn't notice it. If you ever see this happen and know for 100% sure that you didn't accidentally cause it then it's a problem and you should visit the dealer.
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      10-31-2017, 11:33 AM   #4
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Quote:
Originally Posted by CanAutM3 View Post
What about the M buttons ?
Good point.
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      10-31-2017, 12:36 PM   #5
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Get the GTS DCT flash - its amazing!!
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      11-01-2017, 10:24 AM   #6
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Quote:
Originally Posted by hellokitty View Post
Get the GTS DCT flash - its amazing!!
What exactly does that change, w.r.t. to the ZCP DCT flash?
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      11-01-2017, 11:47 AM   #7
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Quote:
Originally Posted by stormlv View Post
What exactly does that change, w.r.t. to the ZCP DCT flash?
http://f80.bimmerpost.com/forums/sho...8#post22319708
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      11-01-2017, 12:39 PM   #8
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Im experiencing the same thing but I think its normal. Just got the car yesterday
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      11-01-2017, 01:06 PM   #9
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Quote:
Originally Posted by hellokitty View Post
Get the GTS DCT flash - its amazing!!
Does it void the warranty?
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      11-01-2017, 01:10 PM   #10
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Quote:
Originally Posted by OF Hero View Post
Does it void the warranty?
It could, but the risk is low.
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      11-01-2017, 01:12 PM   #11
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Quote:
Originally Posted by OF Hero View Post
Does it void the warranty?
Probably. That didn't stop me since I was SO fed up with the jerkiness and just pulled the trigger one day. That thing was broken from the factory IMO.

If it wasn't for the flash, I probably would have traded my F80 in.
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      11-01-2017, 01:15 PM   #12
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Quote:
Originally Posted by Radartrap View Post
My '15 F82 M4 coupe with DCT has ~7,500 miles. Three concerns:

1. When starting from cold (overnight or longer, any weather), there's a lag of 1 to 1.5 seconds to get the car moving forward or backward in D or R. If I give it more than a little gas, it lurches. Problem disappears within a mile of driving.
With my '18 M3, I don't notice as long of a lag as I just give it a light touch on throttle and I can feel the clutch engaging moving it forward. But sounds normal.

Quote:
2. When driving in D, transmission sometimes clunks when it shifts down approaching a traffic light.
That's the cost of running a dual clutch v. traditional auto.

Quote:
3. When driving in full automatic mode, I'll occasionally hear engine revving. Cause: transmission has gone into the manual shift mode--display on tach shows the gear I'm in, not "D." This happens randomly but not infrequently. I'm certain I haven't accidentally touched the paddle shifters or the console shift lever.
Same as #2. There's a reason why Lexus and Cadillac engineers choose a traditional fast shifting but less responsive in manual mode TC auto - it's more refined for everyday. Just enjoy the ride.
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      11-01-2017, 01:19 PM   #13
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I've also read about some people getting it.done thru BMW? Is that even possible?
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      11-01-2017, 01:55 PM   #14
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Quote:
Originally Posted by OF Hero View Post
I've also read about some people getting it.done thru BMW? Is that even possible?
Probably, but it will probably cost you in the thousands. Might as well use that money to get an aftermarket warranty.

I paid $195 for the DCT flash. Best damn $195 bucks I ever spent!
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      11-01-2017, 03:18 PM   #15
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Quote:
Originally Posted by hellokitty View Post
Probably, but it will probably cost you in the thousands. Might as well use that money to get an aftermarket warranty.

I paid $195 for the DCT flash. Best damn $195 bucks I ever spent!
From where?
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      11-01-2017, 03:19 PM   #16
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Quote:
Originally Posted by allinon72 View Post
From where?
European Auto Source in Anaheim, California. Also, there is a vendor here named Alex@Alpine who will do this remotely as well. He is located in Los Angeles for those who are local.
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      11-01-2017, 03:28 PM   #17
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Agree with Venere and CanAutM3; mine is a 2016 with just coming up on 10K miles. All normal and you likely are touching something putting it into manual mode.

I did complain to the dealer about it and they flashed the ECUs because I have a good relationship with my mechanics and asked them to do it for that and a couple of other items just to make me happy.

You did not state what mode you switch to or if you do. The more aggressive the throttle/trans settings are, the more the car will lurch when cold. My mechanic also said to at least let the car warm up a little before taking off if I wasn't.
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      11-01-2017, 05:34 PM   #18
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Have you ever had a manual tranny car before?
For me, after driving manual 325i for 8+ years, DCT is very smooth.
If your experience comes from standard torque converter auto trannies, this may explain you worrying about DCT clunkiness.

Also, one things that is wrong with automatic transmissions, is that pple often think they have problems. They start testing them, changing oil, software etc and often find nothing....
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      11-04-2017, 09:16 PM   #19
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Quote:
Originally Posted by georgere View Post
Have you ever had a manual tranny car before?
For me, after driving manual 325i for 8+ years, DCT is very smooth.
If your experience comes from standard torque converter auto trannies, this may explain you worrying about DCT clunkiness.

Also, one things that is wrong with automatic transmissions, is that pple often think they have problems. They start testing them, changing oil, software etc and often find nothing....
Yeah you'd love the "cold grind" on a manual.
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      11-04-2017, 09:56 PM   #20
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All the things mentioned seems normal, except for the last one, but like others mentioned i think something gets pressed.

+1 for GTS tune, makes a big difference, and I'm really enjoying mine and how it transforms the shifting of DCT
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      11-04-2017, 10:22 PM   #21
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DCT always has certain characteristics that you look for. What your experiencing is very normal. More so for the F80/F82 since M-DCT behaves and acts like a manual car. DCT is always clunky at low gears, no professional reviewers really mentions this but this is normal.

You just have to get used to it. I am. If you drive more DCT cars you can pick out little things about a double clutch transmission. No matter how good a DCT is like the Porsche PDK, you can tell it is a DCT car with how it behaves.

It's worse on some cars like the Benz. Or more noticeable like M-DCT since BMW designed it for you to notice the car doing things.

1-2 is normal. Car needs to warm up. 3 is you accidentally don't touched the manual shifter and moved it to Sequential.
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      11-05-2017, 08:05 PM   #22
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Definitely make sure you have the most recent ECU software. Dealer updated mine when I had a transmission component replaced (software in there was still dated from 2015). I immediately noticed the clunky downshifting in "D" improved a bit.
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