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03-12-2013, 10:43 PM | #1 |
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An Old DCT Lag Rant
This is an old Rant I wrote when I was justifiably really pissed off at BMWNA. My 2009 e90 M3 was a lemon that they couldn't fix. This was the old DCT lag issue that is no longer present. I'm reprinting this because I'm sure the same A-holes that screwed me back then are probably still employed by BMWNA.
I admit that my problems may be worse than the majority of folks out there, but I am sure I am not alone. I'm just more vocal.
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Dinan compliment of stuff plus PF rotors and RG63s. Enough for now. Why, yes. I am an abrasive bastard. |
03-12-2013, 10:50 PM | #4 |
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I did.
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Dinan compliment of stuff plus PF rotors and RG63s. Enough for now. Why, yes. I am an abrasive bastard. |
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03-13-2013, 12:25 AM | #5 |
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RJ: Thanks for reigniting my passion for this topic. I am also suffering as I beg to disagree - this lag is still present!
Although I have vehemently argued in the past that some sort of purposeful adaptation routine, that attempts to intelligently modify the DCT software to the user driving style, absolutely does not exist, my lag has grown from truly imperceptible to clearly present, annoying and bad enough to be borderline unsafe at times. It can be particularly bad under circumstances which also under prior software versions could cause lag. Medium, even speed, perhaps in the 40-60 mph range, gentle to medium (street level) braking, then followed by a medium throttle applied rapidly and immediately after letting off the brake. I've experienced lag which can be about 1 full second. The car simply feels as if it is completely ignoring the throttle application (and it really is). What can we do to get some resolution to the issue? I'm long off or my factory warranty and also had a terrible go around with BMW NA not taking care of an issue that occurred just under 50k miles but ended up at the dealer at around 50,030. Can we revisit the issue with the NHTSA? Look for a lawyer to take a class action? Letter writing campaign? The DCT continues to amaze me with its performance, character and adjustability but as I have said prior this lag issue is like the giant pimple on the nose of the supermodel. Well of course also not covered by this analogy is that this situation is borderline or perhaps even definitely dangerous. Are others continuing to suffer from this lag? Cheers.
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03-13-2013, 12:51 AM | #7 |
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What do you expect with the big turbo, it needs time to spool
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03-13-2013, 03:23 AM | #8 |
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03-13-2013, 08:08 AM | #9 |
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03-13-2013, 09:18 AM | #10 |
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Reset on DCT
- I was advised on the forum that several runs over5,000 rpm followed by taking foot off throttle resets software and it seems to work for me.
-Are you in D5? If so the car is less likely to ignore slower speed attained during braking and downshift when throttle is applied. - My car ABSOLUTLEY "learns" based on recent driving intensity.I think-lol-if not crazy ass placebo effect. Sorry in advance if this is not helpful. My car HAS had terrible software issues and still on occasion exhibits loud, rougher sound along with VERY firm ride. Before the first update I had it was surging every time I came to a stop and applied brakes- still does that a little now and then- going to gett latest software and reinstall of Dinan software from private shop next week. |
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03-13-2013, 10:25 AM | #11 |
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my 2009 had dct lag issues for almost it's first whole year .. but by the 3rd software update/recall it was mostly resolved.. However, every now and then i did feel the shifts were are still not 100% as fast as it should occur...certainly not in the two second range though..
...and right after the third update my idrive started shutting off completely while driving.. but it only happened intermittantly.. I'm not sure if the update screwed me over or if there was just some fault with the idrive electronics as they could never reproduce the issue and no one else online seems to be having the same problem. anyways good riddence to that car.. I'm in a 2013 with 6MT and latest idrive now... --mike |
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03-13-2013, 11:46 AM | #14 | |||
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Quote:
Quote:
Quote:
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E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK | | Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors | | Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels | | XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit | |
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03-13-2013, 12:49 PM | #16 |
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I was going to ask what you considered lag, but reread your post, and found your pretty good description. I've noticed that somewhat too, though I've always attributed that to DCT wanting to not downshift aggressively to save gas, not lag. If you don't brake hard, it seems like it will stay in 7 very long, so once you hit the gas, it has to downshift a lot of gears. I've noticed if I brake more aggressively, it downshifts quicker, and I don't see the issue (but that's a workaround). I'm not a DCT expert, but would 7 and 3 share the same clutch, and if it has to do that shift, it's somewhat slow? I don't think I've ever had my software updated, so I have no experience to compare to.
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03-13-2013, 02:19 PM | #17 |
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Its too bad people are still having an issue as my DCt works so flawlessly and fast that I can't imagine faster performance from a transmission. WIth that said I drive mostly in manual mode which if you are experiencing the lag with D mode than the obvious fix is to drive in manual mode.
When I drive in D mode its always in D5 and to be realistic, its still an automatic mode and just like an auto tranny I expect there to be some delay between when I romp the pedal and when the thing engages. For me sometimes it will not downshift at all when I step on the pedal unless I go beyond the click-down point but that is uncommon. I guess I adapt how I drive to a degree in D as when I want to accelerate, I step on the pedal a second before I know I want to go to kick down the gears, let off slightly and than go throttle when lower gear is engaged but this is different than lag. Basically seems like some perform flawlessly and I can't image anything bettero ut there than this DCT. |
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03-13-2013, 04:56 PM | #18 | |
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E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK | | Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors | | Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels | | XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit | |
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03-13-2013, 04:58 PM | #19 | |
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03-13-2013, 06:27 PM | #20 |
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I get light surging from time to time coming to a stop. Always thought it was normal though
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03-13-2013, 08:58 PM | #22 |
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I am certain this is a distinct issue separate from the DCT lag issue.
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