Quote:
Originally Posted by Suberman
Nope, you never need to help the synchros slow down the dogs. Any extra throttle just wears the synchros for no reason.
You have to remember these constant mesh gearboxes are never out of gear in that sense. All the gears spin all of the time. The reason double clutching downshifts works is the synchros have to speed up a lot of mass to get the dog speeds matching for the lower gear. Going up the box the gear cluster is naturally slowing down as you shift. There's nothing you can do to assist this slowing down.
Now if you're talking about double clutching an "upshift" because you've been coasting (naughty naughty) then I agree it can help but I've never met a gearbox I needed to double clutch a shift after coasting.
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No, no, no. Read what I said. When the gearbox oil is really cold if you're shifting slow the input shaft will slow down faster (or fully stop) than the shift so double clutching can actually help. When it's really cold it doesn't take much time at all for the input shaft to stop spinning with the clutch in.
You're not slowing down the input shaft, you're speeding it back up after it slowed down too fast during the first part of the shift.
Like I said originally, it's not something you would need to do often, but in certain situations it can be handy.