Quote:
Originally Posted by Ecky
I'm not sure this makes a difference?
What causes the engine to decelerate when you take it out of (or between) gear, is friction (fluids, rings, accessories), which is always present, even when the engine is in gear. Were the components frictionless, the engine would not decelerate between shifts.
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But it is increased friction, especially in a manual. In a traditional manual you are closing the throttle and engine braking every time you need to shift, which is another reason dog clutches could be better.
Also in an automatic, the greater the speed difference between the two halves of the torque converter the greater the losses. Having several gears helps, but the losses from shifting are still there.
From what I can tell, the ultimate transmission for both engine and transmission efficiency is the series hydraulic hybrid, which is a type of CVT.