High torque and DCTs
#1
Racer
Thread Starter
High torque and DCTs
I know many of you are saying "WTF another DCT thread?", but for those who say GM should've had a DCT in the C7, consider this tidbit from Jalopnik's review of the Audi RS7:
For reference, the RS7 is rated at 560hp and 516ft-lbs
source here: http://jalopnik.com/2014-audi-rs7-th...view-939983953
The RS7 has too much torque for a dual clutch transmission, so Audi went with a version of ZF's eight-speed automatic. I was upset when I heard about this in Detroit.
I'm not upset anymore.
The software tuning for this gearbox is insanely good. It is honestly the best automatic gearbox I've ever used. Shifts are lazy when you want them to be, but are viciously brutal when you shift manually with the car in dynamic mode. Downshifts are fast and rev-matched, upshifts are quicker than you think an auto can be. Yet in traffic it doesn't jerk around. It combines my favorite parts of a double clutch with the tractability and smoothness of a torque converter. Drive it and you'll understand; It transforms the way you think of an automatic.
It's perfectly suited to the RS7. Honestly, anyone not using a gearbox like this in a super sedan looks foolish.
I'm not upset anymore.
The software tuning for this gearbox is insanely good. It is honestly the best automatic gearbox I've ever used. Shifts are lazy when you want them to be, but are viciously brutal when you shift manually with the car in dynamic mode. Downshifts are fast and rev-matched, upshifts are quicker than you think an auto can be. Yet in traffic it doesn't jerk around. It combines my favorite parts of a double clutch with the tractability and smoothness of a torque converter. Drive it and you'll understand; It transforms the way you think of an automatic.
It's perfectly suited to the RS7. Honestly, anyone not using a gearbox like this in a super sedan looks foolish.
source here: http://jalopnik.com/2014-audi-rs7-th...view-939983953
#3
Le Mans Master
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^ Oh Crap - the RS7 has 4 doors too - what the hell is Team Corvette doing only giving us 2 doors . . . . .
Oh Double Crap - the RS7 base price starts at $104,900 - what the hell is Team Corvette doing only charging half of that . . . . . .
The woulda, coulda, shoulda snipes could go on ad nauseum - there's really no point, imho . . .
#4
Burning Brakes
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WTF??? It's been discussed, it's a combination of the space and the torque that created a problem, one that I'm sure could have been overcome but not within the budget and price constraints.
I wanted a manual transmission, and I'm glad I had that option. Don't be surprised if improvements to the Auto are GM's answer, not the standard Dual Clutch as found in the
I wanted a manual transmission, and I'm glad I had that option. Don't be surprised if improvements to the Auto are GM's answer, not the standard Dual Clutch as found in the
#5
The DCT issue is a tough one. I think the torque excuses was a little weak since there are DCT's that handle 500+ lbs of torque (BMW M6 for example). I think what happened is that GM did not have a DCT in house and getting a third party to make one just for one car would add too much to the cost on the base vette. I think the DCT that say the M6 has would eith not fit, or it would be too heavy for the Vette. We all here have to remember that the "base" corvette is built to be a great car at a price that everyone can afford. With that mission statement there are trade offs that have to be made. One of them I am sure was the DCT. They could have had one built for the car, but the cost of development for that DCT would have to be shared between all of the Vettes made (not just the one's that had DCT as an option). When they looked into the DCT cost and looked into just making improvements to the current A6 the increase cost compared to the increased performance did not justify the DCT.
All of that being said I kinda expect a DCT to be in either the Z06/ZR1 type of HI-PO car. This platform is not as cost restrictive as the "base" vette and would allow for this type of transmission. Also it would give many people another reason to"step up" from the base car.
All of that being said I kinda expect a DCT to be in either the Z06/ZR1 type of HI-PO car. This platform is not as cost restrictive as the "base" vette and would allow for this type of transmission. Also it would give many people another reason to"step up" from the base car.
#7
#12
- Cost
- Space
- No third party suppliers could fit requirements
- GM's transmission program was pretty much put on hold during restructuring
- 8 speed auto program much more advanced than DCT program most likely
DCT would be nice but if they can make an 8 speed comparable to ZF's 8 speed in shift quickness and smoothness, the Corvette be fine.
- Space
- No third party suppliers could fit requirements
- GM's transmission program was pretty much put on hold during restructuring
- 8 speed auto program much more advanced than DCT program most likely
DCT would be nice but if they can make an 8 speed comparable to ZF's 8 speed in shift quickness and smoothness, the Corvette be fine.
#15
Virtual George
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Navy
I asked the DCT question at the 60th in Bowling Green. They said it was the most asked question they get. They also went into how much better the new trans are with shifting saying they are close to the DCT in performance. The reason for no DTC was the CLY Deactivation and the location of the trans in the back.
VG
VG
#16
Le Mans Master
#17
Burning Brakes
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I wonder, why not do a electronic shift manual? Ferrari F1 style, use the old box, to save money. And use actuators for the shifting.
Wonder if it would be reliable for 100K.
Then again, these automatics seem to be getting a little interesting.
Wonder if it would be reliable for 100K.
Then again, these automatics seem to be getting a little interesting.
#18
Mark this post.. GM is NOT doing to go the route of DCT anytime soon, that includes the performance C7 model.
AWD is more likely to happen vs. DCT.
If the Z06/Z07/ZR1/ZR2/L88 or whatever they decide to call it had only a supercharger & AWD (along with fancy carbon fiber body pieces) I am willing to bet it would destroy many supercars out there, even potentially the GT-R.
C7 + 650HP + AWD =
That's all they will need to do, end of story. 0-60 times of 2.8-2.9 would be well within reach, and 10 second 1/4's all day long...
ALSO.. you wouldnt need much wider tires, definitely not a wide body with this setup because of the extra traction AWD would have. The C7 Stingray is the perfect platform to add boost + AWD and roll it out of the factory with a $120K+ price point.
AWD is more likely to happen vs. DCT.
If the Z06/Z07/ZR1/ZR2/L88 or whatever they decide to call it had only a supercharger & AWD (along with fancy carbon fiber body pieces) I am willing to bet it would destroy many supercars out there, even potentially the GT-R.
C7 + 650HP + AWD =
That's all they will need to do, end of story. 0-60 times of 2.8-2.9 would be well within reach, and 10 second 1/4's all day long...
ALSO.. you wouldnt need much wider tires, definitely not a wide body with this setup because of the extra traction AWD would have. The C7 Stingray is the perfect platform to add boost + AWD and roll it out of the factory with a $120K+ price point.
Last edited by WhiteAndBlackC7; 07-29-2013 at 04:35 PM.
#19
Once it's in high gear, what difference does it make how many cyl are on line.
Tranny in front, back or even behind the axel, what's the difference for DTC?
Not a critic, just wondering if I'm missing something.