Quote:
Originally Posted by Ohio Enthusiast
If you apply the throttle with the clutch depressed, you gain nothing inside the transmission, just match the speed of the flywheel to the speed of the transmission input shaft (which has sped up by the synchros) for when you release the clutch.
During double declutching you throttle blip while the shifter is in neutral and the clutch is engaged, hence you spin up the input shaft to match the speed of the output shaft times the gear ratio.
Being gentle with the gear lever does help, as well as momentarily easing the pressure and then applying it again. I rarely have issues with downshifting to 2nd, even at fairly high speeds, but to 1st is always a tough one.
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while dry clutches don't have the viscous coupling that plagues wet clutches I don't think they are completely frictionless. A throttle blip will spin up the flywheel and pressure plate and, in doing so, will exert some pressure on the clutch disk and slightly unload the transmission. It's not huge and not as important as rev matching for the clutch release, but it seems to help in some situations.
I generally have no problem down shifting to first although I don't do it often at speeds above 10 mph. In my experience it rewards patience.