A8 vs A10?
Melting Slicks
Joined: May 2001
Posts: 2,596
Likes: 120
From: East Tennessee
I have no idea why a 6.2 liter, direct injected, high compression V8 with a pretty flat torque curve even needs an 8 speed torque converter auto.
Its not like the old BMW S65 V8 with the 8500rpm red line that didnt make 300ft lbs of torque anywhere or a little 2.0 4 cyl, that could use a 10 speed. LT1 has had 300 ft lbs of torque at 1000rpm
Only reason for a 10 speed is GM is just getting ready for smaller displacement engines and the EPA.
Its not like the old BMW S65 V8 with the 8500rpm red line that didnt make 300ft lbs of torque anywhere or a little 2.0 4 cyl, that could use a 10 speed. LT1 has had 300 ft lbs of torque at 1000rpm
Only reason for a 10 speed is GM is just getting ready for smaller displacement engines and the EPA.
Team Owner
Joined: Mar 2012
Posts: 49,106
Likes: 3,854
From: Best Island in the U.S.
St. Jude Donor '12 thru '17
Burning Brakes
Joined: Jun 2014
Posts: 981
Likes: 157
Having 300 ft-lbs of torque at 1000rpm at WOT is meaningless 99% of the time. That said, it's hard to imagine how the most efficient power range can be so narrow that you need eight or ten speeds to get the best fuel mileage.
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Pro
Joined: Jun 2014
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From: Georgetown Texas
Melting Slicks
Joined: Dec 2015
Posts: 2,209
Likes: 933
From: Just outside a swamp in Florida
In the good old days of 3 speed automatics, 1st would get you to 60, 2nd to 110, by 3rd, you were just seeing how fast the car would go...
Yep, I should be able to get my license suspended for the rest of my life with a 10 speed.
The heck with teaming up with Ford on the 10 speed.
I think GM should just work out the A8 issues to the point it's bullit proof, and tell the rest of the world to go pound sand!
Yep, I should be able to get my license suspended for the rest of my life with a 10 speed.
The heck with teaming up with Ford on the 10 speed.
I think GM should just work out the A8 issues to the point it's bullit proof, and tell the rest of the world to go pound sand!
Le Mans Master
Joined: May 2001
Posts: 8,244
Likes: 850
From: Hamilton Square NJ, Ocean City N. J. Key Biscayne Fla.
With all of the A8 problems being reported on this Forum why would anyone have any confidence in an A10 from GM in a Vette? I drive manuals. But, I don't remember hearing about this many problems in the "outmoded" A6.
Last edited by 69L79; May 21, 2016 at 08:26 PM.
Drifting
Joined: Dec 2003
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From: Hillsdale NJ
Team Owner
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From: Calgary, AB. There's a reason why white was the only color offered on every year Corvette. Proud Canadian German Jamaican!
St. Jude Donor '09, '12-'13-'14-'15-'16-'17
Race Director
Joined: Oct 2005
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From: Plymouth Massachusetts
2025 C7 of the Year Finalist- Unmodified
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Melting Slicks
Joined: Sep 2013
Posts: 2,299
Likes: 466
From: Long Island New York
All of this is courtesy of the EPA and its 54 mpg requirement.
Nothing gets better EPA fuel economy than a computer programmed CVT to maximize mileage in the EPA test cycle.
Pro
Joined: Jun 2013
Posts: 738
Likes: 323
From: FL
Have you even listened to the video of that car on track? If that doesn't get you blood pumping, buy a Prius. I mean, listen to the car shifting. It sounds like the Corvette race car on track.
Last edited by 427bob; May 22, 2016 at 09:42 AM.
Safety Car
Joined: Oct 2012
Posts: 4,788
Likes: 683
From: Austin Texas
St. Jude Donor '15
Car trannys are getting like bicycle gears, single speed cruiser for paper route 50 years ago, 3 speed lighter weight, 10 sp "English" then the 15 speed ultra light weight, I now have a 16 sp with a "Bio crank" that helps to deliver more torque while peddling.
It is my weekend cruiser, 15 years old and less than 30,000 miles on it.
It is my weekend cruiser, 15 years old and less than 30,000 miles on it.
Melting Slicks
Joined: Jul 2014
Posts: 2,195
Likes: 479
From: Bonita Springs Florida
The learning feature appears to be the root of the A8 issues. Going from aggressive driving (which the car begs you to do), to stop and go, seems to cause this problem to occur. Problem also seems arise if at slow speeds if you do quick brake and accelerator moves.
I have come to accept this behavior as normal In much the same way I accept the way the car responds when doing a tight turn as slow speeds and get the front end jerkiness (due to the tires). Nature of the beast
I've noticed that if I drive my car like a Toyota Corolla, it shifts fine all the time. If I do some aggressive accelerations and immediately return to Toyota Corolla driving I will get the occasional "lurch, "buck" or hard downshift.
Last edited by 1SG_Ret; May 22, 2016 at 09:56 AM.