2015 Chevrolet Corvette Z06 - GM 8L90 8-Speed Automatic TransmissionEnlarge Photo
Chevrolet has confirmed that its lightning-fast 8L90 eight-speed automatic introduced on the 2015 Corvette Z06 will also be available on the 2015 Corvette Stingray, when sales of the latter commence this fall (the supercharged Z06 isn’t due in showrooms until early next year). The only difference will be unique clutch and torque converter specifications matched to the torque capacity of the Stingray’s naturally aspirated V-8.
The advanced transmission, which also features paddle shifters, can execute shifts up to eight-hundredths of a second quicker than those of the PDK dual-clutch transmission offered in the Porsche 911. And it’s also capable of handling up to 737 pound-feet of torque.
Other claimed benefits are improved fuel economy, performance, and NVH levels compared to the current six-speed unit. EPA gas mileage results for the 2015 Stingray are still pending, but Chevy says the new transmission is expected to contribute up to 5.0 percent greater efficiency, when compared to the previous six-speed automatic.
Smaller steps between gears, compared to the previous six-speed unit, keep the engine within the sweet spot of the rpm band, making the most of its horsepower and torque to optimize performance and efficiency. Incredibly, use of aluminum and magnesium in the transmission’s construction means the eight-speed auto is also 8.8 pounds lighter than the previous six-speed unit.
Note, Chevy also confirmed this morning that it will present a new variant of its seventh-generation Corvette at the 2014 New York Auto Show next week. For more details, click here.
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