Jerky when decelerating from 3rd to 2nd - DCT

[M4CPF82]

I have a 2017 M4 CP and was searching this forum to see if anyone was experiencing the same thing. Good to know I'm not the only one. This is my first DCT. I have had smooth running AMG autoboxes in the past.
I noticed the problem was worse in D3. I also usually keep it in comfort/comfort/comfort for daily driving and still notice this clunky downshift. As long as it's not damaging the transmission I guess I will just play with modulating the throttle different ways. Anyone have a genuine issue that needed to be addressed by the dealer?

[Pic18]

Should have bought a manual!

[GrussGott]

Originally Posted by Pic18

Should have bought a manual!

The manual is free and available digitally here

[Pic18]

Originally Posted by GrussGott

The manual is free and available digitally here

Touché

[rblood303]

I recently took delivery of 2017 M3 ZCP (3 days ago actually ) and I too have been experiencing this issue. Does anyone have any insight on this? In addition, when I'm accelerating softly from standing, it isn't very smooth when engaging first gear, almost like stepping off the clutch too quickly.

Just for a bit of background, I have been driving manual for years, and also have been driving my wife's Polo GTI and CLA250, which are both dual clutch, and I am driving the M in a similar manner.

EDIT:

Also to describe it better, the jerkiness seems to be because the car is engine braking through the gears but when it gets to 2nd, it seems to disengage or something, but I could be wrong because I am trying to remember... maybe this may jog someone's memory

[OF Hero]

Known "issue."

[TheShaddix]

Not sure if anyone has mentioned this yet, but to fix the jerkiness when downshifting (applies to any car actually) you have to let off of the throttle completely, then shift. It's less obvious in higher gears and seems smooth, but If you're going from 2nd to 1st (like coming to a stop but cruising slowly), it'll be jerky while on throttle. Also, just for that 2nd to 1st gear downshift, the trick to avoid the engine braking is to let off throttle, shift to 1st, then gently tap the gas pedal.

To fix the issue with the 1st gear being jerky when engaging from a stop, the only way is to get the GTS coding. I got mine flashed by Alex at Alpine (remotely) and it's a night and day difference. It engages immediately and can be silky smooth with just a bit of throttle input. I would hate driving this car stock again without this.

[GrussGott]

Originally Posted by rblood303

I recently took delivery of 2017 M3 ZCP (3 days ago actually )

Me too (2018 tho), and after coming from a 2015 non-CP, I can tell you for a fact this CP car drives like a pussy comparatively. Not to be a dick but I"m ready to tell all you people to just get a new car and sports cars aren't for you as any jerkiness is PURELY the user not knowing how to control the car. Period.

This 2018 CP DCT is liquid and smooth as silk - if people can't handle it they're in the wrong car; and that's not a bad thing - everything isn't for everybody.

This "issue" is solved: loose nut behind the wheel.

[Arcades]

Originally Posted by GrussGott

Me too (2018 tho), and after coming from a 2015 non-CP, I can tell you for a fact this CP car drives like a pussy comparatively. Not to be a dick but I"m ready to tell all you people to just get a new car and sports cars aren't for you as any jerkiness is PURELY the user not knowing how to control the car. Period.

This 2018 CP DCT is liquid and smooth as silk - if people can't handle it they're in the wrong car; and that's not a bad thing - everything isn't for everybody.

This "issue" is solved: loose nut behind the wheel.

Having a 2015 M4 myself I know this is true. BMW smoothed out the M-DCT a lot. Before, 2015 Sport+ was near undrivable on street because of how jerky it was from 1 - 3. Through firmware updates it was slowly fixed. I have currently no issues driving Sport+ in my 18' M3. No jerkiness feeling.

Those of you complaining about this never driven a real 6MT before or just don't know how to control the throttle through traffic. M-DCT has a specific behavior, the clutch lets go completely at certain points to prevent wear and tear.

It does not drive like an AT like Porsche PDK or Benz DCT/Wet Clutch. So don't complain like it supposed to feel like one. You're not learning properly.

[GrussGott]

[Race_Doc11]

+1 2018 ZCP

Originally Posted by domino_z

i experienced this few and far in between but it's getting worse now - 2016 build zcp

same problem as op

de-accelerating coming to a stop, in manual mode, letting the car downshift on it's own, as revs fall to idle in 2nd/3rd it starts bucking and i have to manually downshift or press brake to get it to stop

going to go past dealer and do a new firmware flash to see if it helps

[drgmt]

GTS DCT flash resolves this issue for me.

[LukeM15]

Originally Posted by Modaddict79

GTS DCT flash resolves this issue for me.

+1

[domino_z]

Zed coding on fb can apparently do the gts stuff via a usb upload - may be easier option than remote coding

[drgmt]

Originally Posted by domino_z

Zed coding on fb can apparently do the gts stuff via a usb upload - may be easier option than remote coding

I had my car updated to latest software and it made it worse!

Nothing to do with the way I drive it - the software is shit.

GTS DCT flash eliminates the problem totally.

Alex remoted in and took 15 Minutes before I left to work.

[drgmt]

Originally Posted by GrussGott

Me too (2018 tho), and after coming from a 2015 non-CP, I can tell you for a fact this CP car drives like a pussy comparatively. Not to be a dick but I"m ready to tell all you people to just get a new car and sports cars aren't for you as any jerkiness is PURELY the user not knowing how to control the car. Period.

This 2018 CP DCT is liquid and smooth as silk - if people can't handle it they're in the wrong car; and that's not a bad thing - everything isn't for everybody.

This "issue" is solved: loose nut behind the wheel.

If only I could have back the 3 seconds it took to read this post.

[2000cs]

I have been experiencing this exactly as described by the OP, on my 2018 M3 non-CP. For the benefit of GrussGott (whose responses in this thread suggest to me that he is a SA since his response is blame the customer/owner/driver), I have had over 20 BMWs, many manuals, learned to drive on a manual, and this is my second F80 M3 with DCT (the first never did this). It is the car/DCT/software.

My car goes in for service tomorrow morning and I fully expect to hear that they can’t duplicate and there are no codes (they will say it is “normal”). If so, I may try the flash.

[Time Lord]

Originally Posted by Modaddict79

I had my car updated to latest software and it made it worse!

Nothing to do with the way I drive it - the software is shit.

GTS DCT flash eliminates the problem totally.

Alex remoted in and took 15 Minutes before I left to work.

how much was it?

[GrussGott]

Originally Posted by 2000cs

For the benefit of GrussGott (whose responses in this thread suggest to me that he is a SA since his response is blame the customer/owner/driver)

Ha, I'm not an SA, been driving sports cars for 20+ years, plus I just have a low tolerance for pussies and morons.

If this car is "jerky" for you then it's not the right car for you and/or you don't know how to drive it.

Only you can decide which of those applies to you.

[2000cs]

Originally Posted by GrussGott

Ha, I'm not an SA, been driving sports cars for 20+ years, plus I just have a low tolerance for pussies and morons.

If this car is "jerky" for you then it's not the right car for you and/or you don't know how to drive it.

Only you can decide which of those applies to you.

Or I’ve got a bad one, which wouldn’t be the first time BMW delivered something that didn’t live up to its hype. I’ve had several over the years. And, having owned a 2015 M3 without this problem, and now a 2018 that does, I am quite confident it is the car. My problem with your comments in this thread is that you presume no BMW M3/4 could have this issue and it must be the driver; I assert this is simply not true.

I share your low tolerances; and having lived in Newport Beach and several other places I understand how this might be creating incredible frustration for you. Come on out to KY and I’ll take you where the “pussies and morons” don’t dare go, and the revenuers don’t come back!

[GrussGott]

Originally Posted by 2000cs

Or I’ve got a bad one, which wouldn’t be the first time BMW delivered something that didn’t live up to its hype. I’ve had several over the years. And, having owned a 2015 M3 without this problem, and now a 2018 that does, I am quite confident it is the car. My problem with your comments in this thread is that you presume no BMW M3/4 could have this issue and it must be the driver; I assert this is simply not true.

Nooo, I presume the odds of a "problem" being driver-related are 99% and the odds of it being a car problem are 1%, thus if someone is bitching, it's highly likely the problem is the loose nut behind the wheel.

That said, I don't believe one should compare 2015 to 2018 as I just got a 2018 and it behaves much different than my 2015 ... I would've said it was a different car.

I always drive in S and the 2018's speed range/gear is quite different from the 2015, and the downshifting code is different as well - I now find myself shifting when it shifts. I've read about this "problem" and - to your point - thought it was bullshit (based on my 2015 experience), but now that it's happened to me a few times I can see how it would. That said, I would still say these are not "problems", rather they are quirks of the car and you learn to compensate (which is called "driving").

but but but waaahhhh why blame the driver?!!???

Call me old school, but I don't expect a high horsepower sport coupe/sedan to drive like a grocery getter - it's gonna have quirks and you figure them the fuck out or you get a new car cause sports cars ain't for you.

Now, might your specific car have an issue? Sure. the probability is very very low, but it's possible. If other people with your similar build date experience the same thing, then it's normal. (maybe "normal-bmw-should-put-this-on-the-list-normal, but still normal)

Said differently, these aren't perfect products, nor do we want them to be (as they'd cost an astronomical amount). They are what they are - sure maybe BMW could smooth out this or that, and let's tell them about that...but entitlement bitching is what pussies do. My 2018 is much different than my 2015 and there are many things for the worse but .... not perfect, has quirks, figure it out.

So let's just make sure we're not entitlement bitching.

[nicknaz]

Originally Posted by GrussGott

Me too (2018 tho), and after coming from a 2015 non-CP, I can tell you for a fact this CP car drives like a pussy comparatively. Not to be a dick but I"m ready to tell all you people to just get a new car and sports cars aren't for you as any jerkiness is PURELY the user not knowing how to control the car. Period.

This 2018 CP DCT is liquid and smooth as silk - if people can't handle it they're in the wrong car; and that's not a bad thing - everything isn't for everybody.

This "issue" is solved: loose nut behind the wheel.

Lol.

There are some times when the dct in my '15f80 did weird stuff. Like low speeds in 2nd gear in d1 gearbox mode. Car would jerk violently for no good reason, almost like the car was going to stall.

I resolved by using m2 gearbox mode and using more throttle and the flappy paddles. Not a big deal.