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

sflgator · 01-16-2008, 01:39 PM

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

http://www.autospies.com/news/BMW-Sl...ear-Box-25484/

sdiver68 · 01-16-2008, 01:55 PM

Are 7 gears better than 6 in high HP/TQ cars?

sflgator · 01-16-2008, 02:02 PM

Quote:

Originally Posted by sdiver68

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.

E90330iS · 01-17-2008, 03:36 AM

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

imolazhp_ci · 01-17-2008, 03:42 AM

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.

sdiver68 · 01-17-2008, 10:01 AM

Quote:

Originally Posted by imolazhp_ci

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.

!Xoible · 01-17-2008, 10:07 AM

so who said this is going to be on 08 M3???

MTV · 01-17-2008, 10:27 AM

Quote:

Originally Posted by sdiver68

Are 7 gears better than 6 in high HP/TQ cars?

The higher the Horsepower is in the rev range, the more gears desirable.

nusevad · 01-17-2008, 11:10 AM

Quote:

Originally Posted by mantis

so who said this is going to be on 08 M3???

http://www.m3post.com/forums/showthread.php?t=107582

sflgator · 01-17-2008, 02:35 PM

Quote:

Originally Posted by mantis

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."

OBI_agent · 01-17-2008, 02:55 PM

Quote:

Originally Posted by sflgator

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?

!Xoible · 01-17-2008, 02:57 PM

Quote:

Originally Posted by FifthStreetz

http://www.m3post.com/forums/showthread.php?t=107582

Quote:

Originally Posted by sflgator

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?

just4kickz · 01-17-2008, 03:14 PM

double clutch will be sweet.

O-cha · 01-17-2008, 03:16 PM

Quote:

Originally Posted by sdiver68

Are 7 gears better than 6 in high HP/TQ cars?

Yes

Quote:

Originally Posted by imolazhp_ci

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

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

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.

normtrum · 01-17-2008, 03:20 PM

Quote:

Originally Posted by OBI_agent

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

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

md80tom · 01-17-2008, 03:37 PM

The transmission is from Borg Warner correct?

normtrum · 01-17-2008, 03:57 PM

Quote:

Originally Posted by gtiTom

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.

UltimateBMW · 01-17-2008, 04:32 PM

The transmission is from Getrag.

md80tom · 01-17-2008, 07:55 PM

Getrag? Hmph, I thought only Borg Warner made those production dual clutches, oh well good times.

TonyTone · 01-18-2008, 02:11 AM

very great find!

01-16-2008, 01:39 PM	#1
sflgator Major General 166 Rep 5,389 Posts Drives: '09 MB C63 AMG & '08 MB GL450 Join Date: Oct 2006 Location: U.S. iTrader: (1)	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/ __________________ \|2009 RENNtech MB C63 AMG \| Black/Black Leather/Black Maple \| Premium II \| MultiMedia \| iPod \| \| TeleAid \| Charcoal Filter Delete \| BMC High-Flow Air Filters \| High-Flow Secondary Cats \| Clear Side Markers \|
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01-16-2008, 01:55 PM	#2
sdiver68 Expert Road Racer 60 Rep 1,329 Posts Drives: 07 335i e90, 09 335i e93 Join Date: Jul 2006 Location: St. Louis, MO iTrader: (3)	Are 7 gears better than 6 in high HP/TQ cars?
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01-17-2008, 03:36 AM	#4
E90330iS Major General 148 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	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 __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
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01-17-2008, 03:42 AM	#5
imolazhp_ci Major 29 Rep 1,002 Posts Drives: Z4 M Coupe Join Date: Jan 2007 Location: orange county iTrader: (0)	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, 10:07 AM	#7
!Xoible Banned 881 Rep 46,010 Posts Drives: .... Join Date: Nov 2006 Location: . iTrader: (4) Garage List 2008 M3 [4.00] 2007 335i [9.00] 2008 528i [8.00] 2006 Infiniti - G35 ... [8.00]	so who said this is going to be on 08 M3???
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01-17-2008, 03:14 PM	#13
just4kickz boku no namae ha... 344 Rep 11,023 Posts Drives: 2006 BS 330i Join Date: Feb 2006 Location: S. Bay Area, CA + Newark, NJ + ChiCity + True Blue iTrader: (11) Garage List 2006 E90 330i [0.00]	double clutch will be sweet. __________________ looking for a PreLCI Black Sapphire e90 front bumper without license plate holes "Akimbo shotguns. Broken wrists anyone? And don't give me that 'it's just a game' bull**. Where the are my akimbo interventions then?! One scope on each eye mother**er!!"
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01-17-2008, 03:37 PM	#16
md80tom Private 5 Rep 97 Posts Drives: 2006 AW 330i Join Date: Jan 2008 Location: Gaithersburg, Maryland iTrader: (0)	The transmission is from Borg Warner correct?
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01-17-2008, 04:32 PM	#18
UltimateBMW Brigadier General 425 Rep 3,287 Posts Drives: MP4 Join Date: Dec 2006 Location: South iTrader: (0)	The transmission is from Getrag. __________________
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01-17-2008, 07:55 PM	#19
md80tom Private 5 Rep 97 Posts Drives: 2006 AW 330i Join Date: Jan 2008 Location: Gaithersburg, Maryland iTrader: (0)	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
TonyTone Major 215 Rep 1,292 Posts Drives: M3 VERT Join Date: Jan 2008 Location: FL iTrader: (0)	very great find!
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