The 2nd --> 1st downshift when slowing.

Tosh · 09-15-2008, 02:11 PM

I know, I know. I have seen other people talking about this but I did a search and really couldn't come up with much.

When I am driving in auto mode around town and slow to a light, I sometimes get a 'ka-chunk' noise when the DCT shifts into first. It seems others experience this as well.

I don't get it every time and sometimes it's perfectly smooth. Has anyone taken their car in for this or is this just normal for DCT? Unfortunately, my nearest dealer is 250 miles away so it's not like I can just drop by.

Any info would be great.

Thanks.

PunjabiM3 · 09-15-2008, 02:54 PM

I dunno if it is any different for DCT, but on my 6MT I never shift into first unless I am at a complete stop or crawling. I won't ever shift into first if I am, for example, slowing down.

swamp2 · 09-15-2008, 02:58 PM

Yep, seems both intermittent but normal. Some of this roughness may be attributed to the fact that it is mechanically a normal MT inside. It has clutches and no torque converted. However, that being said if the auto downshifts can be perfect sometimes, they should be perfect all the time. Definitely one of those small little annoyances with the M-DCT. Very tolerable though IMHO for all the benefits. Hopefully the rumored September software update, whenever it comes, will address this issue.

Tosh · 09-16-2008, 01:30 AM

Quote:

Originally Posted by swamp2

Yep, seems both intermittent but normal. Some of this roughness may be attributed to the fact that it is mechanically a normal MT inside. It has clutches and no torque converted. However, that being said if the auto downshifts can be perfect sometimes, they should be perfect all the time. Definitely one of those small little annoyances with the M-DCT. Very tolerable though IMHO for all the benefits. Hopefully the rumored September software update, whenever it comes, will address this issue.

Yeah, I had suspicions it was somewhat normal. It is strange though that it shifts perfectly sometimes and not others.

I asked my dealer about the Sept. update and he didn't know anything about it. Hopefully they will get the memo and hopefully the software update fixes some of these glitches.

Either way, fantastic car. I just finished my 1200 mile service and am having loads of fun.

gorun · 09-16-2008, 12:33 PM

If it bothers you just drive in D1 so your car doesnt go into 1st ;-)

GT3 Tim · 09-16-2008, 12:47 PM

Quote:

Originally Posted by gorun

If it bothers you just drive in D1 so your car doesnt go into 1st ;-)

HA...

Yeah, mine does a bit of a clunk sometimes too. I figure it is "normal", although, with all the computer control, etc., you would THINK they could get it to do the 2-1 downshift smoothly everytime! lol

09-15-2008, 02:11 PM	#1
Tosh Enlisted Member Drives: e90 M3 Join Date: Nov 2006 Location: Midwest USA by way of Tokyo Posts: 33 iTrader: (0)	The 2nd --> 1st downshift when slowing. I know, I know. I have seen other people talking about this but I did a search and really couldn't come up with much. When I am driving in auto mode around town and slow to a light, I sometimes get a 'ka-chunk' noise when the DCT shifts into first. It seems others experience this as well. I don't get it every time and sometimes it's perfectly smooth. Has anyone taken their car in for this or is this just normal for DCT? Unfortunately, my nearest dealer is 250 miles away so it's not like I can just drop by. Any info would be great. Thanks. __________________ ☆AW ☆ e90 ☆ M3 ☆ DCT ☆ eighteens ☆no sunroof☆
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09-15-2008, 02:54 PM	#2
PunjabiM3 Lieutenant Colonel Drives: VO 1M Join Date: Mar 2008 Location: Tucson, AZ Posts: 1,673 iTrader: (1)	I dunno if it is any different for DCT, but on my 6MT I never shift into first unless I am at a complete stop or crawling. I won't ever shift into first if I am, for example, slowing down. __________________ New ride ETA 2 weeks 2012 Audi A6 Prestige, Moonlight Blue 2009 Lexus ES350, Sparkling Graphite (wife's) Previous: 11 e82 1M, 07 997TT, 08 e92 M3, 06 997 C2S, 05 e46 M3 coupe, 03.5 e46 M3 cabrio

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09-15-2008, 02:58 PM	#3
swamp2 Major General Drives: E92 M3 Join Date: Sep 2006 Location: San Diego, CA USA Posts: 8,378 iTrader: (1)	Yep, seems both intermittent but normal. Some of this roughness may be attributed to the fact that it is mechanically a normal MT inside. It has clutches and no torque converted. However, that being said if the auto downshifts can be perfect sometimes, they should be perfect all the time. Definitely one of those small little annoyances with the M-DCT. Very tolerable though IMHO for all the benefits. Hopefully the rumored September software update, whenever it comes, will address this issue.

09-16-2008, 12:33 PM	#5
gorun Lieutenant Drives: E92 AW DCT Join Date: Mar 2007 Location: Across the Wall Posts: 427 iTrader: (0)	If it bothers you just drive in D1 so your car doesnt go into 1st ;-)