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Lets assume that.... the automatic trans in today's cars are "maintenance free"... aside from every fluid change at 100,000... let's face it... they are...
what do we expect from the C8 DCT???
when standing still in gear... Ferrari's are "wearing out" the clutches, Likewise I am sure the Lambo. The Alfa 4 c owner are encouraged to not "let the car creep" in gear. some of these cars can wear out the clutch in 12,000 miles and replacing is expensive. Many owners slip the car out of gear when in traffic..
Owners of the cars above often are accepting of such nonsense.... what do we KNOW about the corvette transmission?... is clutch wear the "dirty little secret" no one is mentioning... or is clutch wear just more Ferrari, lambo, Alfa BS maintenance the fools accept.
Would GM stick us with a maintenance nightmare (and themselves a warranty nightmare rather than just putting an auto trans or manual in the car?) those couple hundred millisecond saved with a DCT... will pale when faced with a 4,000 _ clutch job!!!
I recall reading somewhere that the clutch packs in this DCT are dry. Some DCT designs have wet clutch packs ... so maybe that's the difference with the Euro cars. If the clutches are not engaged I don't see how they could wear out just sitting in neutral.
Lets assume that.... the automatic trans in today's cars are "maintenance free"... aside from every fluid change at 100,000... let's face it... they are...
what do we expect from the C8 DCT???
when standing still in gear... Ferrari's are "wearing out" the clutches, Likewise I am sure the Lambo. The Alfa 4 c owner are encouraged to not "let the car creep" in gear. some of these cars can wear out the clutch in 12,000 miles and replacing is expensive. Many owners slip the car out of gear when in traffic..
Owners of the cars above often are accepting of such nonsense.... what do we KNOW about the corvette transmission?... is clutch wear the "dirty little secret" no one is mentioning... or is clutch wear just more Ferrari, lambo, Alfa BS maintenance the fools accept.
Would GM stick us with a maintenance nightmare (and themselves a warranty nightmare rather than just putting an auto trans or manual in the car?) those couple hundred millisecond saved with a DCT... will pale when faced with a 4,000 _ clutch job!!!
valid question and I look forward to a legitimate real answer. I'm just not the guy with that answer!
VW/Audi - major service (fluid change, check clutch packs) @ 40K miles and then every 40K afterwards. Approx $500 for the service. Clutches are the thing that will probably burn out if anything. The hydraulics and TCU (mechatronics in VW speak) generally is solid. If it does go though? Very expensive replacement. Experience to date? I drive the hell out of my car (stock boost levels, not chipped) and auto-X it in addition to daily driver duties. 25K miles on the clock (2017) and no issues at all. It's a little clunky and less than graceful at slower speeds but that's because it's an old DCT design. Still puts a grin on my face though with perfectly matched downshifts everytime and how well it mates with a little 2.0L turbo.
Last edited by dmporter31; 08-09-2019 at 05:25 PM.
I recall reading somewhere that the clutch packs in this DCT are dry. Some DCT designs have wet clutch packs ... so maybe that's the difference with the Euro cars. If the clutches are not engaged I don't see how they could wear out just sitting in neutral.
I've not read anything official, just lots of statements on this forum that the DCT in the C8 is a wet clutch setup. If dry, that would be a red flag to me.
since its an automatic transmission with no clutch pedal I would think every component (including clutches) would be covered under warranty. unless I am mistaken.
I also believe it would be wet clutch. I think the only dry clutch is in the Alfa Romeo 4C, Dodge Darts and the crappy Focus transmissions. those suck (maybe the 4C isn't bad). BTW not counting the old F1 and E-Gear transmissions.
I suspect GM’s team is well aware of our expectations on maintenance and have designed this DCT accordingly. Of course, I expect any high powered sports car to demand more maintenance than an econobox, but in my experience with six Corvettes I’ve never found the maintenance schedule at all unreasonable. I’m sure that will be the case with the C8. Of course, we know very little yet.
Last edited by quick04Z06; 08-09-2019 at 05:38 PM.
I recall reading somewhere that the clutch packs in this DCT are dry. Some DCT designs have wet clutch packs ... so maybe that's the difference with the Euro cars. If the clutches are not engaged I don't see how they could wear out just sitting in neutral.
It's going to be a wet clutch setup I think. The motor trend article I read said that they are slipping the clutch packs up to 10% to quell inherent vibration with the v4 v8 mode and who knows what else.
Let's just hope they didn't try to reinvent the wheel with DCTs. Yes the clutch packs wear out and yes itll require a big dollar maintenance at 15 or 30k miles or however many years. If it doesn't? god only knows what we're in for.
As of the date of that article they were still trying to adjust the trans tune which was I think 2 weeks to reveal. I expect in the first couple of years for there to be several as in plenty of updates to the programming.
GM is like Microsoft.. just send it out and we'll fix it along the way... always has been probably always will be.
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
All I can tell you is my PDK is wet clutch and the only maintenance called for is oil change at 12 years or 120,000 miles.
Since we know nothing about the Tremec DCT, all we can do is wait for the details.
All I can tell you is my PDK is wet clutch and the only maintenance called for is oil change at 12 years or 120,000 miles.
Since we know nothing about the Tremec DCT, all we can do is wait for the details.
My 2011 Spyder has a clutch oil service at 6/60 and trans oil (lower pan) at 12/120.
I don't know a lot about transmissions, but what I've been told for the "regular" automatics is, if you want to keep it for a long time, keep the fluid clean. And like one person on here who has hundreds of thousands of miles of experience, my experience has been to follow some good advice for TC trans from those who've serviced them. I have the fluids changed pretty regularly, about every 30K. Inexpensive, (not cheap) and 175K+ miles on many vehicles is fine with me. If a Chev-designed DCT exceeds, or matches those "suggestions for service" after a certain number of miles on the car, I'm ok with that, too.
Graziano is an Italian company that supplies the dual-clutch transmissions for McLaren, Ferrari, Lamborghini, and other high end cars. The clutches are wet clutches housed in a separate section with a filter and oil to water cooler. The transmission gears are in its own housing with separate fluid, filter, and oil to water cooler. When you have the brake applied the clutches are disengaged. When you release the brake pedal the car will start to creep without any throttle application. Ferrari engages neutral by pulling both paddles simultaneously. McLaren has a neutral button on the console. There is no park function in the Graziano transmission. When you shut the engine off the electronic parking brake secondary caliper is automatically applied. There is a way to override the parking brake for maintenance reasons if you need to roll the car. Unclear if the C8 Tremec dual-clutch has an actual park function. Service on the Graziano dual clutch is oil and filter change at specified intervals.
If you are interested in the Graziano technology this is a good article: https://www.autoblog.com/2011/05/13/...mission-in-th/
Tremec may not use the same technology.
This will be huge money. Folks have no idea. The DCT in the C8 alternates between dry and wet modes. If you drive it hard be ready to pay big $$ in clutch changes. Every engine in the Corvette is a torque monster, the DCT won't last nearly as much as your DOHC 4 cylinder engine's.
I asked that exact question today at the C8 reveal near me. I was told that there wasn't any maintenance other than fluid changes, although he did say that was his opinion and that he hadn't seen anything in writing.
Graziano is an Italian company that supplies the dual-clutch transmissions for McLaren, Ferrari, Lamborghini, and other high end cars. The clutches are wet clutches housed in a separate section with a filter and oil to water cooler. The transmission gears are in its own housing with separate fluid, filter, and oil to water cooler. When you have the brake applied the clutches are disengaged. When you release the brake pedal the car will start to creep without any throttle application. Ferrari engages neutral by pulling both paddles simultaneously. McLaren has a neutral button on the console. There is no park function in the Graziano transmission. When you shut the engine off the electronic parking brake secondary caliper is automatically applied. There is a way to override the parking brake for maintenance reasons if you need to roll the car. Unclear if the C8 Tremec dual-clutch has an actual park function. Service on the Graziano dual clutch is oil and filter change at specified intervals.
If you are interested in the Graziano technology this is a good article:
Tremec may not use the same technology.
So if you drive the car hard on track and then park it with the rotors hot, there is no way to have the brakes disengaged? That sounds like a recipe for warping rotors.
St. Jude Donor '06-'08-'10-'11-'12-'13 '14-'15-'16-'17-'18-'19
Originally Posted by SBC_and_a_stick
This will be huge money. Folks have no idea. The DCT in the C8 alternates between dry and wet modes. If you drive it hard be ready to pay big $$ in clutch changes. Every engine in the Corvette is a torque monster, the DCT won't last nearly as much as your DOHC 4 cylinder engine's.
You must have access to info the rest of us haven't seen. Please post the reference material you got this info from.
Under clutch design. "The clutch design marries the benefits of wet and dry clutch technologies into a hybrid design. A highly efficient wet clutch system with optimized friction materials have the ability to cool the clutches with lubrication individually and only when needed. The end result is a controllable thermal load and much lower drag."
08-09-2019, 05:16 PM
DCT.... how much maintenance should we expect?
