Quote:
Originally Posted by serialk11r
You know since the 718 and 991.2, PDKs have been doing this right? They slip both clutches in higher gears to allow you to roll along with the engine at idle speed, presumably to prevent the clutch from heating up as quickly. Previously, there would only be one clutch slipping in 1st gear while you roll at 3mph, but I think it can now roll several times faster than that. The idea being it's more efficient to slip the clutch a little than to increase the revs from 700 to 1200 if you only need to maintain a slow speed. I haven't actually seen it in action, I imagine it only works up to whatever comes out to 3rd gear and 1200rpm with little throttle input.
I also believe there's gotta be some car out there using both clutches initially on a launch to reduce shock. The efficiency is still 0 when the car is stopped, but you get that extra kick of torque at the wheels with 2nd gear also transmitting torque, then you can disengage and rely on 1st gear alone once the tire is starting to slip.
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Interesting, I’ll have to dig in to some MB documents and see how they’re doing things.
I was commenting more along the lines of both clutches actually applied, trans brake style. Maybe nothing? Just both spinning along happily? I would imagine an engine spinning at one rpm and a driveshaft spinning at one rpm can’t have two different transmission ratios in between. Something would give. Like I said, nothing I’ve seen before.
This guys thesis actually rounds things up nicely. Not a terrible read.
https://pdfs.semanticscholar.org/bf3...de73be635b.pdf