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BMW 3-Series (E90 E92) Forum > BIMMERPOST Universal Forums > General BMW News and Cars Discussion > The '08 M3's 7-speed double clutch tranny info released



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      01-16-2008, 01:39 PM   #1
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The '08 M3's 7-speed double clutch tranny info released

The '08 M3's 7-speed double clutch tranny info released...

http://www.autospies.com/news/BMW-Sl...ear-Box-25484/
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      01-16-2008, 01:55 PM   #2
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Are 7 gears better than 6 in high HP/TQ cars?
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      01-16-2008, 02:02 PM   #3
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Quote:
Originally Posted by sdiver68 View Post
Are 7 gears better than 6 in high HP/TQ cars?
Not sure; I think it depends on the gear ratios. However, it seems that the auto mfgr's are moving toward more gears...it used to be 4, then 5, and now the std. auto has 6 gears with 7 and 8 now on some lux. cars. My wife's MB GL450 has a 7-speed auto tranny as well; 7th gear overdrive is only engages above 65mph on the highway.
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      01-17-2008, 03:36 AM   #4
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Yea, 4 speed autos are obsolete now I believe except on some ultra-economy cars. Most makes now have 5 speeds standard and the luxurious brands have 6 speeds standard with 7 speed exclusive to mercedes and 8 speed to lexus
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      01-17-2008, 03:42 AM   #5
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they do more gears so you can make the lower gears shorter and the higher gears very long, aids in maximum acceleration from a standstill and maximum efficiency at cruising.
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      01-17-2008, 10:01 AM   #6
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Quote:
Originally Posted by imolazhp_ci View Post
they do more gears so you can make the lower gears shorter and the higher gears very long, aids in maximum acceleration from a standstill and maximum efficiency at cruising.
I understand the concept, but at what point do you trade gearing advantage for the number of shifts it takes? Is it 6,7,8....15? I don't know, but I can see a point at which adding gears actually reduces performance...which I thought was part of the reason CVT's were developed.
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      01-17-2008, 10:07 AM   #7
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so who said this is going to be on 08 M3???
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      01-17-2008, 10:27 AM   #8
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Quote:
Originally Posted by sdiver68 View Post
Are 7 gears better than 6 in high HP/TQ cars?
The higher the Horsepower is in the rev range, the more gears desirable.
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      01-17-2008, 11:10 AM   #9
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Originally Posted by mantis View Post
so who said this is going to be on 08 M3???
http://www.m3post.com/forums/showthread.php?t=107582
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      01-17-2008, 02:35 PM   #10
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Quote:
Originally Posted by mantis View Post
so who said this is going to be on 08 M3???
It says right in the article I posted...

..."The new M double-clutch transmission with Drivelogic shifts gears without the slightest interruption in the flow of power, thus promoting both the sports driving experience and gearshift comfort for the driver. In its gearshift characteristics, the new M double-clutch transmission with Drivelogic is ideally matched to the fast-revving V8 power unit in the new BMW M3. Making its debut on the same occasion in the BMW M3 Coupé, the BMW M3 Saloon and the BMW M3 Convertible, the new transmission helps to provide even faster and more dynamic acceleration."
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      01-17-2008, 02:55 PM   #11
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Quote:
Originally Posted by sflgator View Post
It says right in the article I posted...

..."The new M double-clutch transmission with Drivelogic shifts gears without the slightest interruption in the flow of power, thus promoting both the sports driving experience and gearshift comfort for the driver. In its gearshift characteristics, the new M double-clutch transmission with Drivelogic is ideally matched to the fast-revving V8 power unit in the new BMW M3. Making its debut on the same occasion in the BMW M3 Coupé, the BMW M3 Saloon and the BMW M3 Convertible, the new transmission helps to provide even faster and more dynamic acceleration."
So, how much more do you have to pay for this transmission, over the manual?

Is the price out yet?
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      01-17-2008, 02:57 PM   #12
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Quote:
Originally Posted by FifthStreetz View Post
Quote:
Originally Posted by sflgator View Post
It says right in the article I posted...

..."The new M double-clutch transmission with Drivelogic shifts gears without the slightest interruption in the flow of power, thus promoting both the sports driving experience and gearshift comfort for the driver. In its gearshift characteristics, the new M double-clutch transmission with Drivelogic is ideally matched to the fast-revving V8 power unit in the new BMW M3. Making its debut on the same occasion in the BMW M3 Coupé, the BMW M3 Saloon and the BMW M3 Convertible, the new transmission helps to provide even faster and more dynamic acceleration."
i thought 08 is ONLY manual, then whatever SMG or DCT will come the year after?
the article doesnt say anything about it being on 08's.. i still cant find that?
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      01-17-2008, 03:14 PM   #13
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double clutch will be sweet.
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      01-17-2008, 03:16 PM   #14
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Quote:
Originally Posted by sdiver68 View Post
Are 7 gears better than 6 in high HP/TQ cars?
Yes


Quote:
Originally Posted by imolazhp_ci View Post
they do more gears so you can make the lower gears shorter and the higher gears very long, aids in maximum acceleration from a standstill and maximum efficiency at cruising.
Remove the efficiency part at least BMW usually gears their cars to speed regardless.

Quote:
Originally Posted by sdiver68 View Post
I understand the concept, but at what point do you trade gearing advantage for the number of shifts it takes? Is it 6,7,8....15? I don't know, but I can see a point at which adding gears actually reduces performance...which I thought was part of the reason CVT's were developed.
That's the whole point, its a DCT transmission, there is no disadvantage to having tons of shifts, they are faster than instant, there is no off power.

Quote:
Originally Posted by MTV View Post
The higher the Horsepower is in the rev range, the more gears desirable.
That's one way of putting it I guess, In a car like ours it would be kind of dumb to have a gearbox keeping us between 6-7k all the time.
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      01-17-2008, 03:20 PM   #15
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Quote:
Originally Posted by OBI_agent View Post
So, how much more do you have to pay for this transmission, over the manual?

Is the price out yet?
$2700 US

Quote:
Originally Posted by mantis View Post
i thought 08 is ONLY manual, then whatever SMG or DCT will come the year after?
the article doesnt say anything about it being on 08's.. i still cant find that?

M-dct will come out for early production in the US....march - may for the e92. M-dct will be available for the e90 in June (that's me!!!!)

http://www.m3post.com/forums/showpos...16&postcount=1
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      01-17-2008, 03:37 PM   #16
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The transmission is from Borg Warner correct?
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      01-17-2008, 03:57 PM   #17
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Quote:
Originally Posted by gtiTom View Post
The transmission is from Borg Warner correct?
I think that's correct....I thought I saw that on the m3 forum a few days ago. I'll try and find it.
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      01-17-2008, 04:32 PM   #18
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The transmission is from Getrag.
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      01-17-2008, 07:55 PM   #19
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Getrag? Hmph, I thought only Borg Warner made those production dual clutches, oh well good times.
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      01-18-2008, 02:11 AM   #20
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very great find!
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