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Old 11-02-2006, 08:20 AM   #1
NYCshopper
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Default Volvo & Ford to get twin-clutch gearbox (available in around 2 yrs)

Volvo & Ford to get twin-clutch gearbox (available in around 2 yrs)

http://www.whatcar.com/news-article.aspx?NA=222937

Quote:
Clever new gearbox for Volvo and Ford

Twin-clutch gearbox apes VW's DSG
Should be available in around two years
Porsche developing similar gearbox, too

Volvo has revealed that a new twin-clutch gearbox is on the way for its cars and says the 'box will also be used in parent company Ford models.

The new transmission is similar to the Direct Shift Gearbox from the Volkswagen Group in that it features a pair of clutch plates so the next gear needed can be prepared while one is already engaged.

If Volvo and Ford have done their work right, it should provide the same fast, smooth shifts as the DSG transmission. Like the DSG gearbox, it could also match, possibly even better, the fuel consumption and carbon dioxide emissions of conventional manuals.

Porsche is also developing a twin-clutch gearbox to replace its existing Tiptronic system.
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Old 11-02-2006, 12:38 PM   #2
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Just in time for the next-gen R models.
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Old 11-02-2006, 09:23 PM   #3
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EXCELLENT! The more folks that use them, the more likely it'll be for them to propagate to more models, at more companies.

(I'd like one in MY STI, along with a shift knob, like the M3, that functions as a sequential shifter)

GREAT for use on the road, or track, and no chance of going from 4th to 1st, on the heel & toe, and blowing the engine.
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Old 11-03-2006, 10:12 AM   #4
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CVT and DCT are the benchmark transmissions for the coming 10 years.

- CVT and DCT have similar excellent fuel effenciency for gas and diesel(compared to 4-5-6AT)
- CVT with torque convertor offer best driving comfort.
- CVT is limited for FWD
- CVT and DCT handle are capable for all FWD applications
- DCT has 2nd best driving comfort, but always has problems with traffic lights and short curves/hairpins (it changes gears too slowly)
- CVT offers best degree of freedom for component layout
- CVT is cheaper: CVT costs roughly USD 900-1000, DCT cost roughly USD 1200-1350 (@ 1 million cars annually)

So CVT is the best choice for all FWD cars.
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Old 11-03-2006, 10:17 AM   #5
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Originally Posted by MTB-er View Post
So CVT is the best choice for all FWD cars.
, that seems like a rather large generalization.

I'm also under the impression the CVT has troubles dealing with large amounts of torque.
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Old 11-03-2006, 10:36 AM   #6
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Originally Posted by LastResort View Post
I'm also under the impression the CVT has troubles dealing with large amounts of torque.

Nissan's CVT doesn't seem to have that much of issue w/ torque (Altima, Maxima, & Murano)

not sure about the other auto manufacturers...
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Old 11-03-2006, 11:08 AM   #7
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The torque capabilities of CVT's have slowly been creeping up as more development goes into them. The Nissan CVT's are roughly at the limit of torque handling as far as current CVT designs go. Consider traditional Automatics (in roughly the same package space) can handle upwards of 500 hp.

Tom
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Old 11-03-2006, 01:49 PM   #8
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Please note that CVTs are only for FWD or 4WD. There's no application with 500hp on the front wheels in the world, because simply you'll have no launch performance (i.e.slip).

Most of the FWD applications are below 350Nm, which are no problem at all for CVT, as NYCshopper already mentioned. Actually the Nissan Murano GTS (UK development) has even 350 hp or so with 4WD without any problem.

Anyway,please bear in mind that 90% of all cars have torques below 350Nm. High torque applications are only for fun and prestige, not for the local John Smith general (=high volume) requirements and possibilities (money!).

In 1995 or so there was a Renault-Williams Formule 1 concept 4WD car with CVT with 800 hp with no problem at all. Actually, David Couldhard was 1-2 seconds faster each lap (!) than regular F1 cars, as there was no time lost with gear changes and CVT can be controlled in such a way that at all times high torque is available (or fuel efficiency for regular cars). However the F1 boss, Bernie Ecclestone, banned it because `it was not fair to the other teams.`

As the F1 rules will be changed from 2009 it is expected that CVT will be introduced by then.
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