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Originally Posted by justjohn
I think there must be some fundamental flaw in my understanding of the system though, because rev-matching seems counter-intuitive in terms of wear to me.
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It isn't, for the reasons you gave below :
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"It's not using the clutch when RPMs are high that's hard on it, it's when there is a large difference between where the engine speed is and where it 'should' be for whatever gear you're going to."
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Rev-matching is really necessary when you're downshifting pretty hard , i.e. when going fast.
When you're downshifting a much slower speeds, the differences in rotational speed are also lower.
Downshifting into 1st or 2nd gear however, is always best done using rev-matching, as these are very short gears.
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Cause when I learned that keeping on the gas during upshifting was bad for it, I originally assumed the logical link was simply "high RPM = bad for the clutch."
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The smoothest way to shift up is to reduce the throttle when upshifting, rather than cutting it, so that when the clutch re-engages, the engine turns over at the rpm it'd normally do in the next gear at that speed.
It doesn't take much gas to do so.
Essentially, it's rev-matching again.