Called the 2015 Hydra-Matic 8L90 Eight Speed RWD Transaxle
Chevrolet recently introduced a new 8-speed dual clutch automatic gearbox option for the 2015 Chevrolet Corvette Stingray. According to the carmaker, the LT1 6.2-liter V8 mated with the new gearbox will make the car faster while consuming less fuel.
With it, the car is now able to do a 0-97km/h run in just 3.7 seconds, 0.1 second quicker over the six-speed auto currently being offered. The new gearbox also lets the Stingray do the quarter mile in just 11.9 seconds, again 0.1 second faster than the 6-speed automatic gearbox.
The faster performance figures is down to the gearbox's 7.0 overall gear ratio spread that improves its off the line operation along with a quicker 4.56 first gear ratio. The new first gear ratio beats the 6 speed’s 4.03 first gear ratio.
The 8-speed automatic also consumes less fuel and has been rated by the Environmental Protection Agency (EPA) of the USA to have a highway fuel consumption of 12.3km/l. This is a 3.5% increase in fuel efficiency according to the American automaker. In urban and mixed consumption ratings, the car does 6.8km/l and 8.5km/l respectively. The less fuel intake is due to the 8-speed’s 2.41 rear axle ratio that reduced the engine’s rpm by 8% (123rpm less).
“The Corvette Stingray is a great example of how we are leveraging engineering and technology to improve both efficiency and performance. No other car can match 460 horsepower, 0-60 mph in better than 3.7 seconds, and 29 mpg on the highway,” said Mark Reuss, GM Executive Vice President, Global Product Development, Purchasing & Supply Chain.