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      08-19-2018, 03:42 PM   #1
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Question DCT jerkiness in 3rd gear

I've been experiencing an issue with jerkiness.

Usually in third, at constant throttle or slightly off throttle it will start to pulse a bit. Around 1200 rpm, driving through parking lots/slow traffic. In efficient and D1. I've driven manual cars, and I understand what the transmission is. But this particular quirk doesn't seem right.

An unrelated thing, but that has bugged me since I got the car, there's a electrical whine at a certain point on the throttle. A little off of the point needed to maintain speed at 70. Anybody else have that?
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      08-19-2018, 04:42 PM   #2
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By it's nature, you will get some jerkiness at slow speeds with a DCT. I wouldn't consider any electrical whine acceptable, not sure I've ever heard of that issue. I would take it to the dealer ASAP.
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      08-19-2018, 05:01 PM   #3
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I found D3 to be intolerable and unusable when it came to jerkiness in low gear. I never use it anymore.

I keep at D2 all the time. I think it's perfect, I have it set that way for both M buttons too.
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      08-19-2018, 08:52 PM   #4
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Jerking in slower speed, under 15mph, is normal.
But you should check it out with Dealer for peace of mind..
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      08-19-2018, 09:07 PM   #5
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Is it normal for the DCT to make a clunk noise at highway speeds? For instance, cruising at 75 mph in 7th. Take your foot off the gas, put it back on, audible clunk which you cannot feel. Doesn't always do this.
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      08-19-2018, 09:20 PM   #6
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Quote:
Originally Posted by TanzaniteBlue View Post
Is it normal for the DCT to make a clunk noise at highway speeds? For instance, cruising at 75 mph in 7th. Take your foot off the gas, put it back on, audible clunk which you cannot feel. Doesn't always do this.
That doesn't sound normal. Are you sure that's not the burbles from the exhaust?
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      08-19-2018, 09:30 PM   #7
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Quote:
Originally Posted by marvinp View Post
That doesn't sound normal. Are you sure that's not the burbles from the exhaust?
Definitely not burbles. It's not really a clunk, more of a metallic click. Almost like the clutches are re-engaging. Does it almost always letting off and putting your foot back on the gas at highway speeds. I also have GTS DCT software, it did it before this as well. So I'm thinking its just how the DCT is.

Last edited by TanzaniteBlue; 08-19-2018 at 09:45 PM..
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      08-19-2018, 09:50 PM   #8
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Quote:
Originally Posted by Sparem View Post
I've been experiencing an issue with jerkiness.

Usually in third, at constant throttle or slightly off throttle it will start to pulse a bit. Around 1200 rpm, driving through parking lots/slow traffic. In efficient and D1. I've driven manual cars, and I understand what the transmission is. But this particular quark doesn't seem right.

An unrelated thing, but that has bugged me since I got the car, there's a electrical whine at a certain point on the throttle. A little off of the point needed to maintain speed at 70. Anybody else have that?
get the gts dct software.. I am not saying it will rectify jerkiness but there is no harm. Personally since the gts dct software the only jerkiness I feel is sometimes with sport + in 2nd.
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      08-19-2018, 10:06 PM   #9
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Quote:
Originally Posted by Aapparition90 View Post
get the gts dct software.. I am not saying it will rectify jerkiness but there is no harm. Personally since the gts dct software the only jerkiness I feel is sometimes with sport + in 2nd.
Can confirm the GTS software is a MASSIVE Improvement. No more jerkiness in the throttle period. The only weirdness is what I mentioned above, and what the car has done for a long time; metallic clicks from the DCT when you re-engage the throttle at highway speeds in higher gears.
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      08-19-2018, 10:34 PM   #10
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Quote:
Originally Posted by TanzaniteBlue View Post
Can confirm the GTS software is a MASSIVE Improvement. No more jerkiness in the throttle period. The only weirdness is what I mentioned above, and what the car has done for a long time; metallic clicks from the DCT when you re-engage the throttle at highway speeds in higher gears.
I have the GTS DCT and still have the jerking in the lower DCT gears, probably due to my stage II tune and the increased torque (close to 500) causing my issue. With the G80/82/83 rumored to ditch the DCT, might be a good thing, especially with the impressive 0-60 times of the M5 and M850 using the 8 speed auto gear box.
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      08-20-2018, 08:27 AM   #11
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Quote:
Originally Posted by Ibiza View Post
I have the GTS DCT and still have the jerking in the lower DCT gears, probably due to my stage II tune and the increased torque (close to 500) causing my issue. With the G80/82/83 rumored to ditch the DCT, might be a good thing, especially with the impressive 0-60 times of the M5 and M850 using the 8 speed auto gear box.
So if the GTS dct software still has jerking, what’s the benefit of having it flashed? Cost?
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      08-20-2018, 08:30 AM   #12
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Quote:
Originally Posted by shortseller View Post
Quote:
Originally Posted by Ibiza View Post
I have the GTS DCT and still have the jerking in the lower DCT gears, probably due to my stage II tune and the increased torque (close to 500) causing my issue. With the G80/82/83 rumored to ditch the DCT, might be a good thing, especially with the impressive 0-60 times of the M5 and M850 using the 8 speed auto gear box.
So if the GTS dct software still has jerking, what's the benefit of having it flashed? Cost?
I thought it would solve the issue. Would be interesting if other ECU tuned DCT vehicles are still jerking after the GTS tune.
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      08-20-2018, 08:54 AM   #13
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Quote:
Originally Posted by TanzaniteBlue View Post
Can confirm the GTS software is a MASSIVE Improvement. No more jerkiness in the throttle period. The only weirdness is what I mentioned above, and what the car has done for a long time; metallic clicks from the DCT when you re-engage the throttle at highway speeds in higher gears.
Are you sure the clicks come from the DCT and not the e-diff?

Off throttle the diff unlocks for stability and locks back up for traction when you get back on the throttle. The clutches in the diff make a perceptible clicking sound when in action.
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      08-20-2018, 11:55 AM   #14
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Quote:
Originally Posted by CanAutM3 View Post
Are you sure the clicks come from the DCT and not the e-diff?

Off throttle the diff unlocks for stability and locks back up for traction when you get back on the throttle. The clutches in the diff make a perceptible clicking sound when in action.
It does sound like its coming more from the rear of the car than the DCT at times. So is this a normal noise then? It is like something clicking back into place for sure, and doesn't always do this. Do you experience this in your car when you get back on the throttle at highway speeds?
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      08-20-2018, 04:29 PM   #15
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Quote:
Originally Posted by Sparem View Post
An unrelated thing, but that has bugged me since I got the car, there's a electrical whine at a certain point on the throttle. A little off of the point needed to maintain speed at 70. Anybody else have that?
Yes. 70 thru 80 under light acceleration. Crossing 50 mph, too. Noticeable electrical high pitch whine.

Shop foreman listened to it before 1200 miles... said come back and see me later, but shook it off for the most part.

Call BMW USA and let them know. They will write it down. At least it will be two of us
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      08-20-2018, 04:31 PM   #16
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Quote:
Originally Posted by TanzaniteBlue View Post
Is it normal for the DCT to make a clunk noise at highway speeds? For instance, cruising at 75 mph in 7th. Take your foot off the gas, put it back on, audible clunk which you cannot feel. Doesn't always do this.
Mine does this as well, 2018 ZCP M3.
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      08-20-2018, 04:34 PM   #17
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+1 have the GTS DCT flash and hear the clunking. I'm usually in D2 or Sport mode.
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      08-21-2018, 05:40 PM   #18
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Quote:
Originally Posted by Aapparition90 View Post
get the gts dct software.. I am not saying it will rectify jerkiness but there is no harm. Personally since the gts dct software the only jerkiness I feel is sometimes with sport + in 2nd.
Where do you get the GTS DCT software?
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      08-22-2018, 10:04 PM   #19
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Thanks for the responses everyone.

I will have to make an appointment with the dealer to see about the whine and what if anything they can do about the transmission.
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      08-22-2018, 10:28 PM   #20
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Quote:
Originally Posted by CanAutM3 View Post
Quote:
Originally Posted by TanzaniteBlue View Post
Can confirm the GTS software is a MASSIVE Improvement. No more jerkiness in the throttle period. The only weirdness is what I mentioned above, and what the car has done for a long time; metallic clicks from the DCT when you re-engage the throttle at highway speeds in higher gears.
Are you sure the clicks come from the DCT and not the e-diff?

Off throttle the diff unlocks for stability and locks back up for traction when you get back on the throttle. The clutches in the diff make a perceptible clicking sound when in action.
Agree my diff makes that clicking noise as well
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      08-23-2018, 08:26 AM   #21
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I've heard the electrical whine a few times on highway at speeds above 100km/h

Sounds like the audio interference you get when you run power cables too close to speaker wire in an aftermarket stereo install

I can't replicate it, and it's totally random
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