Quote:
Originally Posted by lemetier
That aspect isn't going away. Like M-DCT and PDK-S, brake release does not engage forward creep automatically.
PDK is not 7ms - 8ms for a gear change. I don't know of any Transmission capable of such and that's faster than any No-Interrupt Electrical Transfer Switch can achieve. Porsche publish "less than 100ms" for gear changes in the Lightning Shift mode on PDK-S, and "less than 200ms" on PDK in Sport with Chrono.
The torque converter does not "lock up gear each time". It goes to 100% lock from a standstill before 1000rpm in Sport+. It does not unlock again while in motion, even during a shift. Only the shifting elements after the TC manipulate shifts and they are sequential, overlap, clutch-to-clutch through the full range.
What vehicles with this same transmission have you driven?
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Agreed, and just wanted to add that the latest ZF 8-speed autos has a "Automatic Idle Shift" system that puts the transmission in a "pseudo-neutral state once the vehicle is close to stopping", when for instance waiting for a green light at a intersection (in order to save fuel). That way the engine can idle free, just like when in neutral or the clutch disengaged on a manual. To release AIS is usually done by throttle tip in or footbrake release.
Quite possibly this function can be incorporated on the M cars so you don't have forward creep automatically when releasing the brake, but have to apply "throttle tip in" to activate forward motion.
By the way, the ZF 8-speed also has the possibility to perform multiple downshift strategies and can be downshifted from 8th to 2nd in one gearchange.
It will be interesting to see how they implement the ZF 8-speed and which functionalities they implement. And also how it's perceived by the press and owners when the cars start to arrive...