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| 10-10-2012, 10:41 AM | #1 |
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Private
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Intermittent slow DCT shifting?
At a track day this past weekend, I noticed that my DCT was shifting flawlessly during the first few laps, had a slight delay during the middle lap or two (on upshifts), and then acted perfectly fine for the final couple laps. has anyone ever experienced this?
i had the traction control off, and the shifting intensity was set all the way up to 6. |
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| 10-10-2012, 11:08 AM | #2 |
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Major
 
Drives: 2008 E92 M3 SS2 DCT Join Date: Jan 2012
Location: Montreal
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Got that only once on a very hot day. I guess it is the tranny overheating. Other folks that run in hotter climates have had the issue.
 a little and you'll find some more info on the topic. |
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| 10-10-2012, 02:04 PM | #3 |
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Private First Class
 
Drives: 08 E90 M3 DCT Join Date: May 2011
Location: SoCal
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I've had overheating problems every time I went to the track with temperatures in the mid-90s and up. I've had both engine oil overheating and DCT overheating issues.
Symptoms of the DCT overheating are: * slower than usual shifting * not shifting at all * shifting by itself to higher gears * loss of lower gears By the time you get the above symptoms (except slow shifting), you would typically get an overheating warning message. |
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| 10-11-2012, 07:37 AM | #4 |
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Brigadier General
 
Drives: 04 330Ci, 11 E90 M3 Individual Join Date: Mar 2006
Location: Milwaukee, WI
Posts: 4,046
iTrader: (8)
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Unless you've been running something longer than a 20 minute DE session your DCT shouldn't overheat. How many shifts are you doing per lap? I've never had a heat issue in 100 degree temps but you do have to manage the car. You can't keep the tach pinned at the redline the entire time.
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| 10-11-2012, 10:18 PM | #5 | |
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Private First Class
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All should be ok. Just pull up for a few laps or wait till next session. When it gets really hot you get the warning light in advance as was mentioned.
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SG, M-DCT.
KW Clubsports, Akrapovic catless GT4 with BPM tune, half cage, Recaro Profis /Schroth 6 pts, Stoptech ST60/ Cobalt XR2 race pads, Bimmerworld CF backing plates, Apex ARC 8's, Yoko A005 slicks, RKP GT4 Splitter, APR GT250 Wing, BMC filter, BW race F CAB's, Dinan R Toe Links, Mini CS battery. Dry-3200 pounds  |
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| 10-12-2012, 07:12 AM | #6 | |
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Brigadier General
Drives: 04 330Ci, 11 E90 M3 Individual Join Date: Mar 2006
Location: Milwaukee, WI
Posts: 4,046
iTrader: (8)
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Quote:
I could down shift into 2nd later into the turn but not sure if I'm comfortable with that. But I haven't had a ton of seat time in my E90 to really build a lot of comfort. I am comfortable mid-corner shifting with my 6SP 330 because I'm in control.
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| 10-12-2012, 01:44 PM | #7 | |
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Private First Class
Drives: 08 E90 M3 DCT Join Date: May 2011
Location: SoCal
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Quote:
I checked my videos from a few weeks back in mid-90s temperature, it took 8 laps (~13min including 1 warm-up lap) for the car to overheat at which point I pulled back. And this was with upgraded cooling. Oil temperature needle was almost touching the 300F and I got warning that only higher gears were available. If nobody else is having this problem than my only conclusion is that something is wrong with my car... |
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| 10-12-2012, 03:47 PM | #8 | |
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Brigadier General
Drives: 04 330Ci, 11 E90 M3 Individual Join Date: Mar 2006
Location: Milwaukee, WI
Posts: 4,046
iTrader: (8)
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Would going from S6 to S4 allow your DCT to run cooler?
Quote:
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| 10-12-2012, 04:37 PM | #9 | ||
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Private First Class
Drives: 08 E90 M3 DCT Join Date: May 2011
Location: SoCal
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Quote:
Quote:
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| 10-12-2012, 07:51 PM | #10 | |
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Brigadier General
Drives: 04 330Ci, 11 E90 M3 Individual Join Date: Mar 2006
Location: Milwaukee, WI
Posts: 4,046
iTrader: (8)
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Quote:
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