Quote:
Originally Posted by justjohn
So you're saying over-revving the engine by downshifting isn't actually straining the clutch, it's only like if you stay on the gas while upshifting?
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Its not "over-revving" the engine, its more like giving the throttle a little "blip" while you are downshifting to match the speed of the engine with the speed of the transmission (hence the term "rev-matching"). When the engine/transmission are perfectly matched at the same speed, there is no wear on the clutch at all.
It's mainly a technique used in race driving (heel toe shifting) to keep the car's weight distribution balanced while braking into a corner ...but that's another topic all together. But it's also a useful application in the real word in that it saves wear on the clutch.
You want to try to blip the throttle to put the revs where they "should" be in the lower gear. It takes practice to get it just right. You know youve got it right is when you downshift, there is no jerking/shifting of the car.
Skip to 1:47
http://youtu.be/W7bb2OKFKgc