Speculation is running rampant on the Internet these days about what’s believed to be the long-dreamed-about mid-engine C8 Corvette, predicted to be a 2019 model.
Car & Driver’s Don Sherman believes the new Corvette will have just one transmission available when it comes out in less than two years – a dual-clutch automatic transmission (DCT) from Tremec.
Sherman says Tremec – which supplies the manual transmission for the C7 – decided not to reinvent the helical gear used in DCTs, so to speak, and instead just bought a company that already knew how to make such a transmission – Hoerbiger Drivetrain Mechantronics.
Hoerbiger currently provides DCT transmissions for Mercedes-AMG, Ferrari, and McLaren.
That merger has led to Tremec’s TR-9007 family of transmissions that can be provided in rear-drive, all-wheel-drive, and transaxle configurations. Car & Driver believes that spy photos of prototypes of mid-engine Corvettes show that Chevy is already testing these transaxles for drivability and durability.
The magazine says the TR-9007 should be very capable of being used in a new Corvette since Tremec engineering documents show it can handle 9000-rpm maximum input speed and 664 lb-ft of torque, both of which exceed the current C7 Z06 levels.
The new transmission, with a die-cast aluminum housing, has seven forward gears, including three overdrive ratios, and a 5.6:1 ratio spread, and is described as “virtually dry wet clutches” by Tremec.
DCTs are more efficient because their helical gears (in place of a conventional automatic’s planetary gears) create lower hydraulic and friction losses. Because torque delivery is not interrupted during upshifts, DCTs can generally accelerate faster than manual transmissions.
Car & Driver
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