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      04-15-2008, 08:36 PM   #1
man02195
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Gustav's video of M3 with M-DCT tranny

Other than being another AW coupe, this is some pretty excellent footage and commentary:

http://www.m5board.com/vbulletin/sho...d.php?t=117051
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      04-15-2008, 08:38 PM   #2
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Nice!
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      04-15-2008, 09:28 PM   #3
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      04-15-2008, 09:30 PM   #4
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Awesome, thanks for the post
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      04-15-2008, 09:31 PM   #5
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The videos are basically verifying what we though we already knew. That is in the more agressive modes the next clutch is engaged much more quickly. The "feedback" being nothing more than an energy dump from flywheel to rear wheel.

The in lower modes the close the next clutch more slowly allowing the flywheel to dissipate energy without the spike in acceleration.

Interesting note on the clutch. Does anyone know how the durability of a wet clutch compares to a dry?
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      04-15-2008, 09:31 PM   #6
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Sweet!!!
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      04-15-2008, 09:36 PM   #7
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Quote:
Originally Posted by enigma View Post
Interesting note on the clutch. Does anyone know how the durability of a wet clutch compares to a dry?
I don't know but a wet clutch is supposed to dissipate heat better. Therefore, I believe it is safe to say that it should be just as durable, if not more so, than a dry clutch. This is a new transmission for BMW, so expect glitches. I don't think durability will suffer. I'd expect electronics/programming to be the weak link. Hopefully there will be none, but we'll see.
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      04-15-2008, 09:44 PM   #8
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Wow, that's the most comprehensive video review to date. Very, very, good stuff. I will have my DCT car in the next few days. Those video reviews will be hard to beat.

If anyone has doubts about DCT, these videos should quell your apprehension.
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      04-15-2008, 09:48 PM   #9
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I got a headache from the shaky camera work
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      04-15-2008, 09:58 PM   #10
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Holy shit ... down shifting on the freeway is going to be sick with DCT.
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      04-15-2008, 09:58 PM   #11
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Quote:
Originally Posted by hakaida442 View Post
I got a headache from the shaky camera work
Don't watch it ... LISTEN to it.
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      04-15-2008, 10:00 PM   #12
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Don't watch it ... LISTEN to it.
too late.
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      04-15-2008, 10:19 PM   #13
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Does DCT/SMG allow you to over rev the engine if you down shift too far?
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      04-15-2008, 10:21 PM   #14
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Quote:
Originally Posted by MDCTFTW View Post
Does DCT/SMG allow you to over rev the engine if you down shift too far?
no, it would ignore (delay until safe?) such a shift.
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      04-15-2008, 10:22 PM   #15
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Quote:
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no, it would ignore (delay until safe?) such a shift.
oh good cause I could see myself getting carried away with down shifting.
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      04-15-2008, 10:39 PM   #16
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Curious: based on these videos truly the only point to S5/S6 compared to S1 is feel, the jerkiness of the shift; the shift times seem to be the same. I was under the impression that especially at the track, smoother is better, so would it be a mistake to round the track in the higher S modes?
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      04-15-2008, 10:44 PM   #17
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Quote:
Originally Posted by Saturn View Post
Curious: based on these videos truly the only point to S5/S6 compared to S1 is feel, the jerkiness of the shift; the shift times seem to be the same. I was under the impression that especially at the track, smoother is better, so would it be a mistake to round the track in the higher S modes?
I think in lower modes shift times are slower thus you get no NOS effect in both D and S. Maybe?
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      04-15-2008, 10:47 PM   #18
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GOD that sound is AMAZING for stock!
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      04-15-2008, 10:48 PM   #19
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Quote:
Originally Posted by Saturn View Post
Curious: based on these videos truly the only point to S5/S6 compared to S1 is feel, the jerkiness of the shift; the shift times seem to be the same. I was under the impression that especially at the track, smoother is better, so would it be a mistake to round the track in the higher S modes?
What do you mean by shift time? In the slower modes, it will be interesting to know if the DCT is letting out the clutch slower and smoother.

So while the clutch switching will be quick, the modulation of the clutch might be slower on in S1-S3
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      04-15-2008, 10:51 PM   #20
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Shift time as in the amount of time it takes for the selected gear to engage after pulling the paddle. After what I saw, S1 and S5 both took the same amount of time to shift, but S5 provided what the commentators called 'feedback.' I can see why this feedback is desireable, and even preferrable in the driving experience, but as far as on the track performance, isn't smoother/less jerky better?
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      04-15-2008, 10:56 PM   #21
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Quote:
Originally Posted by Saturn View Post
Shift time as in the amount of time it takes for the selected gear to engage after pulling the paddle. After what I saw, S1 and S5 both took the same amount of time to shift, but S5 provided what the commentators called 'feedback.' I can see why this feedback is desireable, and even preferrable in the driving experience, but as far as on the track performance, isn't smoother/less jerky better?

You haven't felt acceleration until you get a kick during gear shifts. My girlfriend has broken hair berettes during an upshift on SMG3. Looks like DCT is much smoother....

The discussion is whether the clutch switch time is the same for all modes and then is the DCT letting out the clutch at a slower rate in different modes. Or are they using some of the tranny fluid to absorb some of the kinetic energy in the slower modes?

I want to know how they do it.
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      04-15-2008, 11:17 PM   #22
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I had the pleasure of driving an M6 on an extended (4-days) test drive. To date, it is the single greatest driving experience I've had. (Minus the minor whiplash I had from the shifting)

As far as I saw in the video, and I think the commentator mentioned that the BMW literature confirms this: the shift times are in fact identical in all S modes; thus the variable between modes is only the amount of 'kick' felt in the cabin.

My question is not one of visceral driving feel, because I can't think of anyone who doesn't enjoy a kick in the ass when shifting. Instead, I'm wondering about track performance, which I understand from my limited track school/bmw performance school experience is all about smoothness/consistency.

Thus, my question remains: given that all S modes' shift times are the same, around the track, is the added 'kick' of S5/S6 compared to the relative smoothness of S1 a detriment to lap time?
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