DCT Clunking under light throttle (warm engine)

volkl23 · 07-07-2017, 11:14 AM

Hey guys, I tried doing a search but didn't see anything relating to my DCT quirk under normal driving conditions (e.g. not a cold engine).

I wanted to see if anyone else experiences this.

When I'm cruising around 50-60 mph in 6th gear with very little throttle load, if I let go, I get a slight clunk. Now coasting, when I press on the throttle, I get a slightly louder clunk. Is this normal?

It seems most prevalent driving in sports throttle, D2. I want to reiterate that I'm not flooring the pedal, but rather very light throttle. I hear it when I let it off (very slight clunk), then a more noticeable clunk when I press on the throttle again (lightly) in 6th gear.

Carl L · 07-07-2017, 11:41 AM

Yup, mine does this. My E92 M3 did too. Lots of groans from the driveline of every M I've owned, same thing with my GT P-cars.

JDougM3 · 07-07-2017, 01:02 PM

It might be pure placebo effect but in the past I've used a reset procedure I read about and it seems to eliminate excessive clunks for my DCT. YMMV

GrussGott · 07-07-2017, 01:39 PM

Quote:

Originally Posted by volkl23

When I'm cruising around 50-60 mph

This seems a bit unusual but I haven't seen 6th gear in a year (and never at 60 mph) and only drive in manual so maybe I just don't notice it.

JOHNBMWM5 · 07-07-2017, 04:11 PM

Quote:

Originally Posted by volkl23

Hey guys, I tried doing a search but didn't see anything relating to my DCT quirk under normal driving conditions (e.g. not a cold engine).

I wanted to see if anyone else experiences this.

When I'm cruising around 50-60 mph in 6th gear with very little throttle load, if I let go, I get a slight clunk. Now coasting, when I press on the throttle, I get a slightly louder clunk. Is this normal?

It seems most prevalent driving in sports throttle, D2. I want to reiterate that I'm not flooring the pedal, but rather very light throttle. I hear it when I let it off (very slight clunk), then a more noticeable clunk when I press on the throttle again (lightly) in 6th gear.

I have had two F80 M3's neither did this, my latest is the CP and that does NOT do that.

horsepower_and_hounds · 07-07-2017, 07:10 PM

Drive line lash? My Early build M4 has a ton...it clunks and clanks all the time under normal driving

lemetier · 07-08-2017, 01:23 AM

Quote:

Originally Posted by volkl23

Hey guys, I tried doing a search but didn't see anything relating to my DCT quirk under normal driving conditions (e.g. not a cold engine).

I wanted to see if anyone else experiences this.

When I'm cruising around 50-60 mph in 6th gear with very little throttle load, if I let go, I get a slight clunk. Now coasting, when I press on the throttle, I get a slightly louder clunk. Is this normal?

It seems most prevalent driving in sports throttle, D2. I want to reiterate that I'm not flooring the pedal, but rather very light throttle. I hear it when I let it off (very slight clunk), then a more noticeable clunk when I press on the throttle again (lightly) in 6th gear.

Most likely you're hearing the dog clutches move in anticipation of a gear change. 5th and 7th share the same one which is at the very rear of the gearbox. For 5th it's closed, for 7th it's open.

stealth70mde · 07-08-2017, 02:13 AM

Quote:

Originally Posted by volkl23

When I'm cruising around 50-60 mph in 6th gear with very little throttle load, if I let go, I get a slight clunk. Now coasting, when I press on the throttle, I get a slightly louder clunk. Is this normal?

My M4 suffers from this also.

JOHNBMWM5 · 07-08-2017, 04:05 AM

Was at a dealership yesterday and a guy with a 2016 M4 whas this, they changed the gearbox and he STILL has it!!!, he was well pi**ed off.

mrgicm · 07-08-2017, 05:58 AM

It is the rear diff

stormlv · 07-08-2017, 06:22 AM

I recently went to the dealer about a similar issue.
In my case, I noticed some clucking, primarily in Sport+ throttle, over 3k RPM, in on/off throttle situations.

The service head came and did a test drive with me.
He said it's normal and that all M3/M4 do it.
He also contacted BMW and they confirmed that it's normal.

hellokitty · 07-08-2017, 08:39 AM

Likely to be normal. Subframe directly mounted to the chassis along with assumingly stiffer drive train bushings will lead to more NVH. Because race car, right?

Fake News 2017 · 07-08-2017, 09:16 AM

My 2017 zcp has never done this under the conditions you described. Actually It never clunks.

MVier · 07-08-2017, 05:34 PM

My 2015 does this too. The lead mechanic at the dealership drove it with me and said it's normal, a designed bit of tolerance in the differential.

JOHNBMWM5 · 07-09-2017, 03:47 AM

Quote:

Originally Posted by TypeM4

My 2017 zcp has never done this under the conditions you described. Actually It never clunks.

Mine the same no problems 2017 M3 CP.

paliknight · 07-09-2017, 11:23 AM

Quote:

Originally Posted by JOHNBMWM5

Mine the same no problems 2017 M3 CP.

Only civic M's have this issue.

GrussGott · 07-09-2017, 11:59 AM

Quote:

Originally Posted by paliknight

Only civic M's have this issue.

why WHY did I buy a civic M4???

I heard the doors on the civic M's are made from empty beer cans collected after a FC Bayern Munich match.

paliknight · 07-09-2017, 04:16 PM

Quote:

Originally Posted by GrussGott

why WHY did I buy a civic M4???

I heard the doors on the civic M's are made from empty beer cans collected after a FC Bayern Munich match.

I ask myself the same exact question

NewM3driver · 07-10-2017, 10:37 AM

OMG I am so happy I opted for the manual. Butter smooth, perfect shifts, rev matching when I want it and NO CLUNKING! I can even park on hills without drama lol

GrussGott · 07-10-2017, 02:19 PM

Quote:

Originally Posted by NewM3driver

OMG I am so happy I opted for the manual.

you would be.

Motodude310 · 07-12-2017, 01:14 PM

What is a civic M?

JOHNBMWM5 · 07-12-2017, 01:20 PM

Quote:

Originally Posted by Motodude310

What is a civic M?

This on a diet.

07-07-2017, 11:14 AM	#1
volkl23 Second Lieutenant 46 Rep 236 Posts Drives: 2018 F80 M3 ZCP Join Date: Dec 2010 Location: USA iTrader: (0)	DCT Clunking under light throttle (warm engine) Hey guys, I tried doing a search but didn't see anything relating to my DCT quirk under normal driving conditions (e.g. not a cold engine). I wanted to see if anyone else experiences this. When I'm cruising around 50-60 mph in 6th gear with very little throttle load, if I let go, I get a slight clunk. Now coasting, when I press on the throttle, I get a slightly louder clunk. Is this normal? It seems most prevalent driving in sports throttle, D2. I want to reiterate that I'm not flooring the pedal, but rather very light throttle. I hear it when I let it off (very slight clunk), then a more noticeable clunk when I press on the throttle again (lightly) in 6th gear.
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07-07-2017, 11:41 AM	#2
Carl L Major 196 Rep 1,248 Posts Drives: '15 M3 Join Date: Aug 2012 Location: West Coast iTrader: (0)	Yup, mine does this. My E92 M3 did too. Lots of groans from the driveline of every M I've owned, same thing with my GT P-cars.
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07-07-2017, 01:02 PM	#3
JDougM3 Private First Class 177 Rep 128 Posts Drives: F80 M3 Join Date: Aug 2011 Location: South Carolina iTrader: (0)	It might be pure placebo effect but in the past I've used a reset procedure I read about and it seems to eliminate excessive clunks for my DCT. YMMV Attached Images
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07-07-2017, 07:10 PM	#6
horsepower_and_hounds Brigadier General 1837 Rep 4,203 Posts Drives: BMW Join Date: Aug 2012 Location: USA iTrader: (9)	Drive line lash? My Early build M4 has a ton...it clunks and clanks all the time under normal driving Last edited by horsepower_and_hounds; 07-08-2017 at 05:17 AM..
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07-08-2017, 04:05 AM	#9
JOHNBMWM5 Live for today tomorrow never comes 1993 Rep 9,500 Posts Drives: 2023 LCI Marina Bay Blue/ Smok Join Date: Jan 2008 Location: UK iTrader: (0)	Was at a dealership yesterday and a guy with a 2016 M4 whas this, they changed the gearbox and he STILL has it!!!, he was well pi**ed off. __________________ Live for now, life is too short. 2023 LCI M5 Marina Bay Blue/ Smoked White Leather, the very last of the F90 M5.
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07-08-2017, 05:58 AM	#10
mrgicm Captain 446 Rep 891 Posts Drives: BMW M Join Date: Nov 2011 Location: Germany iTrader: (0)	It is the rear diff
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07-08-2017, 06:22 AM	#11
stormlv Human 935 Rep 1,202 Posts Drives: Yes Join Date: Nov 2013 Location: Geneva iTrader: (1)	I recently went to the dealer about a similar issue. In my case, I noticed some clucking, primarily in Sport+ throttle, over 3k RPM, in on/off throttle situations. The service head came and did a test drive with me. He said it's normal and that all M3/M4 do it. He also contacted BMW and they confirmed that it's normal. __________________ 2023 BMW M4 CP xDr \| 510HP / 650Nm \| Isle of Man Green \| Photo album Sold 2018 BMW M4 DCT / ZCP\| 450HP / 550Nm \| Sakhir Orange \| Photo album \| Tribute Sold 2014 BMW 435xd \| 360HP / 710Nm \| Estoril Blue \| Photo album 2010 BMW Z4 sDrive35i DKG \| 306 HP / 400Nm \| Space Gray \| Photo album
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07-08-2017, 08:39 AM	#12
hellokitty Brigadier General 2900 Rep 3,729 Posts Drives: '17 M3 ZCP DCT Join Date: Jul 2010 Location: Southern California iTrader: (2)	Likely to be normal. Subframe directly mounted to the chassis along with assumingly stiffer drive train bushings will lead to more NVH. Because race car, right?
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07-08-2017, 09:16 AM	#13
Fake News 2017 HMFIC 336 Rep 568 Posts Drives: Alpine White M4 ZCP Join Date: Dec 2013 Location: NC iTrader: (0)	My 2017 zcp has never done this under the conditions you described. Actually It never clunks.
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07-08-2017, 05:34 PM	#14
MVier New Member 3 Rep 23 Posts Drives: '15 MW DCT M4 Join Date: Dec 2013 Location: Los Angeles iTrader: (0)	My 2015 does this too. The lead mechanic at the dealership drove it with me and said it's normal, a designed bit of tolerance in the differential.
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07-10-2017, 10:37 AM	#19
NewM3driver Colonel 1110 Rep 2,007 Posts Drives: 2017 M3 ZCP Join Date: Nov 2008 Location: CT iTrader: (0)	OMG I am so happy I opted for the manual. Butter smooth, perfect shifts, rev matching when I want it and NO CLUNKING! I can even park on hills without drama lol
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07-12-2017, 01:14 PM	#21
Motodude310 Private First Class 51 Rep 179 Posts Drives: 2011 GTI Join Date: Mar 2016 Location: Chicago burbs iTrader: (0)	What is a civic M?
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