10-31-2017, 11:22 AM | #1 |
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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. |
10-31-2017, 11:29 AM | #2 | |
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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, 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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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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11-01-2017, 01:10 PM | #10 |
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11-01-2017, 01:12 PM | #11 |
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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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11-01-2017, 01:55 PM | #14 | |
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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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11-01-2017, 03:19 PM | #16 |
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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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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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