Quote:
Originally Posted by SleepingBMW
My understanding (not an engineer nor even close) is the ZF8 uses the torque converter from a stop and de facto a DCT in operation for changes after that.
There Is a clutch operating anyway.
What's interesting is the new second gen ZF8 opens the clutch during décélération to lower torque and I suppose save gas and wear.
Senna did this bit I think the going logic is most like the car in gear during deceleration
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The torque converter on the ZF 8 Speed is locked up once the car is in motion. It is, however, a planetary gear transmission and the technology doing the shifts is quite different than a DCT. Both The ZF 8 Speed and the DCT are capable of very fast and very smooth shifts.
From what I found by Googling the ZF 8 speed shifts gears an about 200 milliseconds while the DCT shifts gears in about 100 milliseconds. When comparing these shift speeds keep in mind that the blink of an eye is about 300 milliseconds.