Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

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Thread: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

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    Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    GM claims the new eight-speed is faster than most dual-clutch designs.
    www.GMInsideNews.com
    April 7, 2014
    By: Nick Saporito


    DETROIT - Chalk this up as an instance of confirming what we already knew: the Corvette Stingray is getting the Z06's eight-speed automatic transmission for 2015. The new eight-speed replaces today's six-speed automatic carried over from the C6 Corvette and GM claims this GM designed and built eight-speed is faster than most dual clutch transmissions.

    According to GM, the 8L90 eight-speed should contribute up to 5-percent greater fuel efficiency versus today's six-speed. Chevrolet says EPA fuel economy test results for the 2015 Corvette Stingray are still pending and will be announced later.

    The 8L90 is based on the same transmission that will be offered in the balls-out 2015 Corvette Z06, but it has unique clutch and torque converter specifications to match the lower torque figures in the Stingray's LT1 V-8.

    Like most GM automatics, the 8L90 offers full range manual shift control via steering wheel paddles. GM engineers say the manual shift mode performs on-par with most dual-clutch transmission designs, but has the trademark smoothness that GM automatics are known for.

    The 8L90 is apparently so quick that it can execute up to 160 commands per second. Wide-open throttle upshifts are executed up to eight-hundredths of a second quicker than those of the dual-clutch transmission offered in the Porsche 911.

    During the reveal of the Corvette Z06 Corvette Chief Engineer Tadge Juechter was asked why Corvette did not utilize a dual-clutch transmission. His response, "There is no dual-clutch transmission in the world that can handle this car's [Z06] torque and fit the size requirement - plus this eight-speed is as fast."

    The new 8L90 is built in GM's Toledo, Ohio transmission plant.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Wow. I like rowing my own gears but this is making me think I consider a trade.. Not. But had it been available at the time who knows, I may have gone against my "no automatic in a sports car" rule

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Only 5% economy improvement. More proof that we've hit the limit of benefits to adding more gears. Barring a major technological breakthrough, I think the 8 and 9 speeds manufacturers use these days are going to pretty much be the end of the road. Someone will say "yea that's what people said about 4 speeds, and 6 speeds" but the numbers don't lie. We're getting ridiculously complex with diminishing returns.

    More likely that some breakthrough happens with DCT or CVT, than seeing a traditional AT with 12, 13+ speeds.
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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    A five percent gain is huge.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Smart move to get it into production for '15 to keep the Stingray hot. I expect the 8L90 to be the best 8 speed on the market and arguably one of the best all around transmissions in any form.

    The 8 speed in the F-Type has been called brilliant. The performance gap between TCs and DCTs at this point is small if not virtually nonexistent. Yet, TCs exhibit the kind of NVH qualities that won't be found in a DCT. Acura's new 8/9 speed transmission is a DCT with a TC behind it, merging the best of the both worlds and it will likely raise the bar for future transmissions. If I recall, GM was working on a patent for this as well.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Quote Originally Posted by All Star View Post
    A five percent gain is huge.
    That bumps Corvette in Eco mode to 31.5 MPG as a rough calculation.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    While I can't say this news gets my heart pumping (personally), it can only enhance the already stellar image of an outstanding sports car. The automotive media will love it because, well, they're impressed by lots of gears and things like that. And since GM still sells more automatic Corvettes than it does manuals, this move had to be done to ensure that the car maintains its superiority, performance-wise.
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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    This new Corvette is one bad ass car. I hate yellow and I would drive a yellow Corvette....
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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    It's about time the 8-speed was put in motion. The tooling has been sitting in Toledo for three years.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Now time to get this transmission into other RWD vehicles.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Quote Originally Posted by briandors View Post
    Only 5% economy improvement.
    uuuum are you serious? We are talking about a 460HP V8 powered car, no hybrid tech, capable of 0-60 in under 3.8 secs getting over 31 MPG. Call this guy when GM build a vehicle that can go to the Sun, fly in, and still fly back without ever scorching the paint job. Maybe then he will be impressed.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Quote Originally Posted by briandors View Post
    Only 5% economy improvement. More proof that we've hit the limit of benefits to adding more gears. Barring a major technological breakthrough, I think the 8 and 9 speeds manufacturers use these days are going to pretty much be the end of the road. Someone will say "yea that's what people said about 4 speeds, and 6 speeds" but the numbers don't lie. We're getting ridiculously complex with diminishing returns.

    More likely that some breakthrough happens with DCT or CVT, than seeing a traditional AT with 12, 13+ speeds.
    Just wait for the 16 speeds!

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Quote Originally Posted by LovelyMoon View Post
    Wow. I like rowing my own gears but this is making me think I consider a trade.. Not. But had it been available at the time who knows, I may have gone against my "no automatic in a sports car" rule
    I'm with you on that. I am going to have to drive one to make the choice.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    I have to imagine that this transmission will make it to the full size pickups no later than 2016.

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    Re: Official: 2015 Corvette Stingray Gains Eight-Speed Automatic

    Quote Originally Posted by briandors View Post
    Only 5% economy improvement. More proof that we've hit the limit of benefits to adding more gears. Barring a major technological breakthrough, I think the 8 and 9 speeds manufacturers use these days are going to pretty much be the end of the road. Someone will say "yea that's what people said about 4 speeds, and 6 speeds" but the numbers don't lie. We're getting ridiculously complex with diminishing returns.

    More likely that some breakthrough happens with DCT or CVT, than seeing a traditional AT with 12, 13+ speeds.
    I don't think this application is optimized for FE improvements so 5% may not always be the case. I would think that a 2 speed rear end would make more sense than 12+ speed automatics, especially in trucks.

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