ME numbers!
09-05-2018, 02:24 PM
#21
Race Director
Driveshaft length effect on drivetrain loss is negligible compared to the transmission used. A DCT has more loss than a manual, and will likely put less to the ground than a similar flywheel hp manual car. Note that we're only talking about 10hp on a 500hp car, but it is still less HP, not more.
09-05-2018, 02:31 PM
#22
Advanced
I wouldn’t expect to see a HP increase in the base car if the LT1 is used. Possibly a couple hundred pounds in weight reduction. A small increase in performance due to mid engine design.
09-05-2018, 04:20 PM
#23
515 hp
3323 pounds Z/51 version
0-30: 1.2 seconds
0-60: 3.2 seconds
0-100: 7.8 seconds
1/4 mile: 11.5@126mph
skidpad: 1.12g
70-0: 133 feet
3323 pounds Z/51 version
0-30: 1.2 seconds
0-60: 3.2 seconds
0-100: 7.8 seconds
1/4 mile: 11.5@126mph
skidpad: 1.12g
70-0: 133 feet
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Shaka (09-07-2018)
09-05-2018, 04:39 PM
#24
Team Owner
If GM had wanted to, they could have used a DCT in the C5, C6 and C7 while keeping the driveshaft, instead of the slush-o-matic and manual transmission they chose to use.
Last edited by JoesC5; 09-05-2018 at 05:01 PM.
09-05-2018, 10:16 PM
#25
Drifting
Thread Starter
I just can't see them offering a base car that traps 126'ish mph. That's very close to a C7 Z06.
when the c7 stingray came out they targeted c6 grand sport performance and beat it slightly, they say 3.6/11.8 for C7 GS so that's where im estimating 3.5/11.5 for the base C8.
with dct and more rear weight bias I think it can get there with a 460 hp LT1 or perhaps up to 475 or so.
when the c7 stingray came out they targeted c6 grand sport performance and beat it slightly, they say 3.6/11.8 for C7 GS so that's where im estimating 3.5/11.5 for the base C8.
with dct and more rear weight bias I think it can get there with a 460 hp LT1 or perhaps up to 475 or so.
Last edited by Achmed; 09-05-2018 at 10:18 PM.
09-05-2018, 10:21 PM
#26
Race Director
Driveshaft has nothing to do with the type of transmission used. For example the AMG GT front engine sports car has a torque tube and driveshaft and a DCT and a Porsche Boxster/Cayman does not have a driveshaft yet can have either a manual transmission or a DCT.
If GM had wanted to, they could have used a DCT in the C5, C6 and C7 while keeping the driveshaft, instead of the slush-o-matic and manual transmission they chose to use.
If GM had wanted to, they could have used a DCT in the C5, C6 and C7 while keeping the driveshaft, instead of the slush-o-matic and manual transmission they chose to use.
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VetterFlyer (09-07-2018)
09-06-2018, 08:49 PM
#27
i know a driveshaft has nothing to do with a DCT... I was asking why he thought it was less efficient. I noted the fact that the only disadvantage is a heavier clutch but compared to a manual front engine car with a drive shaft a ME car would still have less rotating mass with a DCT.
Still more efficient than most street car autos(a small convertor glide or a race prepped 200r4 might be about the same?), and the lightning quick shifts make up for it, but when talking strictly dyno numbers a DCT trans eats 2-3% more power than a straight stick. You can back that up by looking bone stock dynos from cars that offer both the DCT and manual. Not a huge difference like I said, but at 500hp thats nearly 15rwhp.
09-06-2018, 10:34 PM
#28
Team Owner
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St. Jude Donor '05
I bet its not more than 20ish. Either they muffled that thing real well or its a smaller displacement DOHC...
The LT5 had a similar tone muffled up. Smoother higher tone to it. Will be interesting to see, the cool thing is after all these years GM finally did it.
Exciting stuff...Ill never be able to afford one but will be fun to watch the development.
The LT5 had a similar tone muffled up. Smoother higher tone to it. Will be interesting to see, the cool thing is after all these years GM finally did it.
Exciting stuff...Ill never be able to afford one but will be fun to watch the development.
09-07-2018, 08:38 AM
#29
Team Owner
manual--------------------------98%
DCT-----------------------------96%
Planetary gear auto------------91%
CVT-----------------------------87%
http://www.getrag.com/en/technology/...ynamics_1.html
Last edited by JoesC5; 09-07-2018 at 08:41 AM.
09-07-2018, 10:57 AM
#30
09-07-2018, 11:02 AM
#31
If as they say there are going to build the C7 for awhile I don't see 2 models with the same "sub names" Like a Z51 for the FE and ME or 2 Z06s etc. I don't think they will keep the Z51, Z06, ZR1, Z07 monikers for the new model why would they? EVERYTHING should start new with the new ME CORVETTE after all won't the engines be "new" and the handling and suspension etc
09-07-2018, 11:56 AM
#32
Safety Car
i know a driveshaft has nothing to do with a DCT... I was asking why he thought it was less efficient. I noted the fact that the only disadvantage is a heavier clutch but compared to a manual front engine car with a drive shaft a ME car would still have less rotating mass with a DCT.
09-07-2018, 03:16 PM
#33
Race Director
DCT has a hydraulic pump system that eats more power than a traditional manual.
Still more efficient than most street car autos(a small convertor glide or a race prepped 200r4 might be about the same?), and the lightning quick shifts make up for it, but when talking strictly dyno numbers a DCT trans eats 2-3% more power than a straight stick. You can back that up by looking bone stock dynos from cars that offer both the DCT and manual. Not a huge difference like I said, but at 500hp thats nearly 15rwhp.
Still more efficient than most street car autos(a small convertor glide or a race prepped 200r4 might be about the same?), and the lightning quick shifts make up for it, but when talking strictly dyno numbers a DCT trans eats 2-3% more power than a straight stick. You can back that up by looking bone stock dynos from cars that offer both the DCT and manual. Not a huge difference like I said, but at 500hp thats nearly 15rwhp.