Re: Double clutching (archive)

Double clutching essentially makes the engine do the same job the synchro normally does, which is to accelerate the transmission input shaft, layshaft and uncoupled gear on the main shaft just before the uncoupled gear engages the fixed gear on the output shaft. If you drive the car hard it will prolong the life of the synchros, but under normal usage the synchros should last a long, long time anyway, so it's not absolutely necessary. Rev matching without double clutching doesn't have any significant effect on the transmission either way, but it will slightly decrease clutch wear since the clutch will not be accelerating the engine speed when it's engaged.

Matt

eh.. cuz the synchros wear out

1) synchros wear out
2) it _is_ faster if you're good at it
3) its a smoother shift
4) its the only way to fly when you need to stay in the powerband

5) rev matching isn't doing the whole job unless you're double clutching...infact it works the synchros harder than not doing anything.

Can someone give a technical explanation for why double clutching would be anything but harmful to a modern synchromesh transmission? I know it's not a faster way to shift, and that it's supposed to be better for the gears, but how? Anyone know? Basically, would learning the skill help extend the life of my gearbox? I'm already a conscientious rev-matcher.
Thanks

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