Dual clutch vs 8l90 tranny
12-16-2018, 01:43 PM
#21
Drifting
Thread Starter
Also I think that wet is better than dry in every case
think about a *****
Last edited by Christi@n; 12-16-2018 at 02:10 PM.
12-16-2018, 02:03 PM
#22
Safety Car
Technical specs on the rumored Tremec DCT transaxle:
https://www.corvetteforum.com/forums...post1598352357
In 2012, Tremec aquired a Belgian company, Hoerbiger Drivetrain Mechatronics BVBA, that specializes in "DCT technology" for exotic sports cars.
From Car and Driver:
Since the Corvette team already have a close relationship with Tremec, using their manual transmissions, it's my belief that a Tremec DCT transaxle is all but certain in the C8.
In 2016 Tremec invested $54 million in a HQ/tranny manufacturing plant in Wixom, MI. They're preparing to manufacture Corvette DCT's right in MI, close to the C8 development team at GM's Warren technical center.
https://www.corvetteforum.com/forums...post1598352357
In 2012, Tremec aquired a Belgian company, Hoerbiger Drivetrain Mechatronics BVBA, that specializes in "DCT technology" for exotic sports cars.
From Car and Driver:
Since the Corvette team already have a close relationship with Tremec, using their manual transmissions, it's my belief that a Tremec DCT transaxle is all but certain in the C8.
In 2016 Tremec invested $54 million in a HQ/tranny manufacturing plant in Wixom, MI. They're preparing to manufacture Corvette DCT's right in MI, close to the C8 development team at GM's Warren technical center.
12-16-2018, 05:25 PM
#24
Advanced
Corvette 8 speed shifts eight-hundredths of a second quicker than the DCT Porsche 911 at wide-open-throttle!
Performance-wise, the 8L90 promises faster shifts than that of the most world-class dual clutch transmissions, despite being a single-clutch unit. And example the Corvette team gave is that it will shift eight-hundredths of a second quicker than that of the dual-clutch transmission offered in the Porsche 911 at wide-open-throttle. And extensive use of aluminum and magnesium make it more than eight pounds, or 4 kg, lighter than the six-speed. Additionally, the 8L90 benefits from packaging efficiencies that DCT gearboxes can’t measure up to, which is one of the main reasons a dual-clutch hasn’t made it in the C7.
Read more: http://gmauthority.com/blog/2014/04/...#ixzz5Zt3elYne
Performance-wise, the 8L90 promises faster shifts than that of the most world-class dual clutch transmissions, despite being a single-clutch unit. And example the Corvette team gave is that it will shift eight-hundredths of a second quicker than that of the dual-clutch transmission offered in the Porsche 911 at wide-open-throttle. And extensive use of aluminum and magnesium make it more than eight pounds, or 4 kg, lighter than the six-speed. Additionally, the 8L90 benefits from packaging efficiencies that DCT gearboxes can’t measure up to, which is one of the main reasons a dual-clutch hasn’t made it in the C7.
Read more: http://gmauthority.com/blog/2014/04/...#ixzz5Zt3elYne
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Christi@n (12-16-2018)
12-16-2018, 05:37 PM
#25
Drifting
Thread Starter
Very subtle, I must say. You must be an engineer to notice this. It seems that GM may have some fueling issues to work out when going from "Throttle-off to partial throttle-on."
Or, this may be built within the tune to reduce wheel spin coming out of turns. (Many a Corvette are in junkyards because of their patented "tail-snap.")
Or, this may be built within the tune to reduce wheel spin coming out of turns. (Many a Corvette are in junkyards because of their patented "tail-snap.")
12-16-2018, 06:28 PM
#26
Le Mans Master
12-16-2018, 07:30 PM
#28
Le Mans Master
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St. Jude Donor '15-'16,'18
The DCT in my Golf R32 was fantastic. I think it was a ZF. I hope the Tremec DCT performs as well.
12-17-2018, 12:12 PM
#30
Why does everybody think the 10L90 from the Camaro can go into the Corvette??? It is a traditional longitudinal transmission, it bolts up to the engine, connects to a driveshaft which goes back to the rear differential. They can not stuff that into the Corvette, let alone the ME.
However, the 4L60 used in the C5 and C6 that's mounted in the rear started life as a one piece transmission case bolted to the engine in the '80s. A three piece transmission case was made for the C5 rear mount...what makes you think the same thing couldn't happen for a front engine C8? For that matter, what makes you think the transmission case can't be changed for a transaxle application? The Turbo 400/3L80 from the '60s was adapted to the front wheel drive Cadillac Eldorado/Oldsmobile Tornado by casting a transaxle case to use the guts of the Turbo 400 and incorporate a differential, it was called the Turbo 425.
Never say never, especially when you don't know history...it's already been done.
PS And don't take my post to mean I think a version of the 10L90 will end up in any Corvette.
12-17-2018, 05:45 PM
#31
Race Director
However, the 4L60 used in the C5 and C6 that's mounted in the rear started life as a one piece transmission case bolted to the engine in the '80s. A three piece transmission case was made for the C5 rear mount...what makes you think the same thing couldn't happen for a front engine C8? For that matter, what makes you think the transmission case can't be changed for a transaxle application?
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Last edited by Tom73; 12-17-2018 at 05:46 PM.
12-17-2018, 06:18 PM
#32
Race Director
Torque convertor transmissions seem to be excellent at 9/10s or 2 tenths. where they fall apart is at 6 /10s...and so the need for a well programed dct for the c8.
no torque convertor transmission need apply.
jmo
no torque convertor transmission need apply.
jmo
Last edited by JerriVette; 12-17-2018 at 06:18 PM.
12-17-2018, 06:31 PM
#33
Melting Slicks
because DCT sucks around town. Slow speed, parking lots, backing up hills, etc. DCT is far superior in spirited driving and beyond and the average M5 buyer is far more likely to spend more time grocery getting than tracking. M3 is a better platform for DCT as is a true sports car. IMO GM goes with a torque converter DCT on a vette regardless
12-17-2018, 08:52 PM
#34
Team Owner
because DCT sucks around town. Slow speed, parking lots, backing up hills, etc. DCT is far superior in spirited driving and beyond and the average M5 buyer is far more likely to spend more time grocery getting than tracking. M3 is a better platform for DCT as is a true sports car. IMO GM goes with a torque converter DCT on a vette regardless
12-17-2018, 09:06 PM
#35
because DCT sucks around town. Slow speed, parking lots, backing up hills, etc. DCT is far superior in spirited driving and beyond and the average M5 buyer is far more likely to spend more time grocery getting than tracking. M3 is a better platform for DCT as is a true sports car. IMO GM goes with a torque converter DCT on a vette regardless
12-17-2018, 09:35 PM
#36
Le Mans Master
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St. Jude Donor '15-'16,'18
All DCTs are not equal. The one in my R32 could be a bit rough around town but during spirited driving, WOW!
12-17-2018, 09:44 PM
#37
Le Mans Master
12-18-2018, 07:44 AM
#38
Team Owner
Whatcha' want to bet that the newest generation of the Corvette will have a DCT and not a GM slush-o-matic.
Last edited by JoesC5; 12-18-2018 at 07:48 AM.
12-18-2018, 10:16 AM
#40
Safety Car
The only way you get smooth shifts and a smooth take off in a DCT is with slipping clutches which produces heat and wear. Below 20 mph presents a big problem and many other situations described else where..
A TC at slow speeds is a fluid coupling which produces heat but no wear. You can't get the same level of smoothness in a DCT but it will cost you if you do.. A properly designed TC in place of the odd gear clutch pack in your DCT would be a cool thing. (Excuse the pun) There are some out there. I wouldn't want one anyway. Why no one has gone the way of the LFA, I don't know.
A TC at slow speeds is a fluid coupling which produces heat but no wear. You can't get the same level of smoothness in a DCT but it will cost you if you do.. A properly designed TC in place of the odd gear clutch pack in your DCT would be a cool thing. (Excuse the pun) There are some out there. I wouldn't want one anyway. Why no one has gone the way of the LFA, I don't know.
Last edited by Shaka; 12-18-2018 at 10:18 AM.