DCT question
Le Mans Master
Joined: Mar 2002
Posts: 6,359
Likes: 163
From: Concord NC
It's my understanding that the transmission in the C6R is a sequential,not a DCT. There are several videos floating around of it in action and while it shifts beautifully,it's not something the average buyer would want in their street car.
Drifting
Joined: Oct 2006
Posts: 1,372
Likes: 311
From: Bristol, VT
As Redzone says, the transmission in the racecar is a sequential that iirc is on the order of 20-30 grand. It is a racing transmission that is not suited to a street car.
Per GM, no DCT available could both hold the torque of the LT1 while also fitting in the C7. They likely did not have the budget to design a new DCT for the Corvette. As GM programs go, budget wise team Corvette basically operates on a shoe string budget. Reading All Corvettes are Red provides great insight into what they had to work with while developing the C5, and budget wise I doubt much has changed.
Per GM, no DCT available could both hold the torque of the LT1 while also fitting in the C7. They likely did not have the budget to design a new DCT for the Corvette. As GM programs go, budget wise team Corvette basically operates on a shoe string budget. Reading All Corvettes are Red provides great insight into what they had to work with while developing the C5, and budget wise I doubt much has changed.
Pro
Joined: Nov 2004
Posts: 567
Likes: 31
most likely a straight cut gears dog box.
if you've ever owned a sport bike and shifted without a clutch, thats how it works.
you 'slam' each gear.
while neat and you do see a few folks who actually convert their transmissions depending on availability (i've seen this in the subaru WRX and STI world) the novelty quickly wears off and the whine of the straight cut gears along with the pain of 'slamming' each gear change can become a pain.
if you've ever owned a sport bike and shifted without a clutch, thats how it works.
you 'slam' each gear.
while neat and you do see a few folks who actually convert their transmissions depending on availability (i've seen this in the subaru WRX and STI world) the novelty quickly wears off and the whine of the straight cut gears along with the pain of 'slamming' each gear change can become a pain.
Drifting
Joined: Oct 2006
Posts: 1,372
Likes: 311
From: Bristol, VT
That is not what people usually mean when they say DCT. And as mentioned, like a motorcycle, there is still manual clutch control, but it is only required for standing starts, vs. a DCT that had computer controlled clutch and shifting. Just because both types are sequential, doesn't mean that they are the same.
The Corvette racing site claims that the C6.R uses an Xtrac 6-speed sequential, if you can provide any information showing that is a DCT I would be interested in reading it to further my knowledge, but the childish insults aren't required.
Burning Brakes
Joined: Aug 2004
Posts: 802
Likes: 1
My understanding was that the C6.R used a box essentially like this: http://www.lgmotorsports.com/product...oducts_id=2179
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Burning Brakes
Joined: Oct 2012
Posts: 933
Likes: 3
From: Dallas, TX
A sequential manual gearbox is not the same thing as a dual clutch transmission. (At least I assume that people mean the C6R has a SMG when they say it has a "sequential" transmission, and not a DCT.)
Last edited by RocketGuy3; Jun 10, 2013 at 12:02 PM.
Drifting
Joined: May 2003
Posts: 1,755
Likes: 97
From: Sandy Utah
Safety Car
Joined: Jun 2004
Posts: 4,430
Likes: 81
From: Whidbey Island WA
No its not but some DCTs are sequential which makes saying that something is a sequential not a DCT incorrect. I have owned all these transmission types including a sequential manual without automated clutching so I'm not exactly unaware of what the differences are.
Instructor
Joined: Nov 2001
Posts: 145
Likes: 38
From: Upper Marlboro MD
The C6R uses a Xtrac sequential,,single clutch
http://www.corvetteracing.com/2012-specifications.shtml
http://www.xtrac.com/sectors/motorsport/sportscar
Pretty sure that Xtrac has no double clutch trannies...
The very expensive Pagani Huayra uses an automated single clutch Xtrac
http://www.pagani.com/en/huayra/default.aspx
A double clutch systems adds a lot of weight ( 100 lbs or more ) and complexity vs a single clutch..
Cheers
http://www.corvetteracing.com/2012-specifications.shtml
http://www.xtrac.com/sectors/motorsport/sportscar
Pretty sure that Xtrac has no double clutch trannies...
The very expensive Pagani Huayra uses an automated single clutch Xtrac
http://www.pagani.com/en/huayra/default.aspx
A double clutch systems adds a lot of weight ( 100 lbs or more ) and complexity vs a single clutch..
Cheers
Melting Slicks
Joined: May 2004
Posts: 2,412
Likes: 137
Safety Car
Joined: Jun 2004
Posts: 4,430
Likes: 81
From: Whidbey Island WA
Did you read what I wrote and fail to comprehend or did you not read it? One of those things is correct buy I'm not sure which. I did not say an automated manual was the same as a DCT and if you want to see a lack of intelligence look in a mirror.
Melting Slicks
Joined: Aug 2005
Posts: 2,873
Likes: 614
Sequential: paddle operated dog boxes that do not need the clutch on upshift, loud, expensive, LOUD, EXPENSIVE
Dual clutch: Uses two clutches for odd and even gears, computer can apply the engine's power to one clutch while disconnecting from the other, heavy, large packaging
Automated manual: usually single clutch manual transmissions with an ECU that controls the clutch, hard to keep as smooth as normal auto or DCT
The latter is closest to the regular manual transmission we see in Corvettes. Lambo and Aston still use it but automakers in general are moving more and more towards the DCTs for performance auto transmissions.
Dual clutch: Uses two clutches for odd and even gears, computer can apply the engine's power to one clutch while disconnecting from the other, heavy, large packaging
Automated manual: usually single clutch manual transmissions with an ECU that controls the clutch, hard to keep as smooth as normal auto or DCT
The latter is closest to the regular manual transmission we see in Corvettes. Lambo and Aston still use it but automakers in general are moving more and more towards the DCTs for performance auto transmissions.
Last edited by Kappa; Jun 10, 2013 at 01:35 PM.
Tech Contributor
Joined: Mar 1999
Posts: 10,445
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From: Northern VA
"Ask Tadge" Producer
Race Director
Joined: Nov 2003
Posts: 16,066
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From: Bergen county NJ
There was a banned forum member here for months...427 something or other....and he would go on and on about DCT transmissions
Cool technology that's not coming to the corvette...buy another brand of sports car for the joy of DCT.
Cool technology that's not coming to the corvette...buy another brand of sports car for the joy of DCT.
Burning Brakes
Joined: Jun 2004
Posts: 1,184
Likes: 3
From: KADS- If it has wings or an engine, I can break it. Dallas TX
A racing sequential box is VERY loud, straight cut gears are strong, but noisy as hell.
The DCT in a vette is probably a cost issue more than anything. But is the best choice for a sports car. Your lap time improves a lot just by getting rid of a manual, plus no missed shifts.
The DCT in a vette is probably a cost issue more than anything. But is the best choice for a sports car. Your lap time improves a lot just by getting rid of a manual, plus no missed shifts.