New Eight-Speed Transmission Could Give Corvette Stingray 30 mpg

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If there were any skepticism about General Motors’ commitment to making the Corvette Stingray one of the most competitive sports cars in the world, then a recent report by the Society of Automotive Engineers (SAE) eradicates any doubt.

According to the top engineering industry source, GM is pretty certain its all-new 8L90 automatic transmission will give the Chevrolet Corvette Stingray an EPA-certified 30 mpg on the highway. And while that’s only two mpg over the 2014 Corvette’s current 28 highway mpg with the 6L80 six-speed automatic transmission, the improvement would definitely put the ‘Vette in an elite class as a sports car.

The new 8L90, which will go into production later this year, is the automaker’s first eight-speed planetary automatic transmission developed in house.

Short of saying it is a for-sure thing, General Motors seems pretty confident it will reach that 30-mpg number with the new transmission when questioned.

“No comment—but we’re giving the vehicle team a ratio spread of seven that’s wider than the current six-speed, and will be useful in improving overall efficiency,” Kavoos Kaveh, GM Powertrain’s Global Chief Engineer for six- and eight-speed automatic transmissions, said according to the SAE report.

Tadge Juechter, Corvette Executive Chief Engineer added: “We’re very close to 30 mpg with the six-speed car, so two extra ratios is something we like very much.”

The new eight-speed is also said to enable upshifts that are up to 0.08 seconds quicker than the DCT-equipped Porsche 911, while also improving the Corvette’s overall NVH attenuation.

To read more of the SAE report on the new 8L90 transmission click here.