Difference between rev matching and double clutching?
Discussion
R_U_LOCAL said:
Different things, yes, but not incompatible with each other.
You can rev-match when single-clutching and you can rev-match whilst double-clutching. On my orignal advanced police course in 1995, double de-clutching was still being taught. Not because the cars required it - they all had fully synchromesh gearboxes with no real need for double-clutching.
The reason it was still taught was to encourage students to slow their gearchanges right down - a slower change is generally a smoother change and the extra pause in the neutral phase gave students more time to match revs on both up and down-changes, and also gave them a more definite phase to consider as part of the planning process on the approach to hazards.
By the time I was instructing in the early 2000s, double-clutching was no longer taught as a matter of course, but I would use it as an instructional technique occasionally when I ever had a student who continually rushed their gearchanges.
The best way to describe the technique is "doing the hokey-cokey on the clutch pedal".
In-out-in-out (shake it all about).
Mechanically, it's almost completely unecessary in modern cars, but can, very occasionally, help with a change down to first on the move, when accompanied with a healthy rev-raise.
Not a bad skill to learn and practice though - particularly if you ever get the chance to have a go in a vehicle with an old fashioned crash (non-synchro) gearbox.
ETA - everything you need to know about gearchanging and rev-matching can be found here:
Zen and the art of changing gear
Thanks Reg, that link and your explanation was really helpful. I'm trying to practice double clutching but I can't do it without revving both times I shift essentially! I guess a bit more practice is needed. You can rev-match when single-clutching and you can rev-match whilst double-clutching. On my orignal advanced police course in 1995, double de-clutching was still being taught. Not because the cars required it - they all had fully synchromesh gearboxes with no real need for double-clutching.
The reason it was still taught was to encourage students to slow their gearchanges right down - a slower change is generally a smoother change and the extra pause in the neutral phase gave students more time to match revs on both up and down-changes, and also gave them a more definite phase to consider as part of the planning process on the approach to hazards.
By the time I was instructing in the early 2000s, double-clutching was no longer taught as a matter of course, but I would use it as an instructional technique occasionally when I ever had a student who continually rushed their gearchanges.
The best way to describe the technique is "doing the hokey-cokey on the clutch pedal".
In-out-in-out (shake it all about).
Mechanically, it's almost completely unecessary in modern cars, but can, very occasionally, help with a change down to first on the move, when accompanied with a healthy rev-raise.
Not a bad skill to learn and practice though - particularly if you ever get the chance to have a go in a vehicle with an old fashioned crash (non-synchro) gearbox.
ETA - everything you need to know about gearchanging and rev-matching can be found here:
Zen and the art of changing gear
Edited by R_U_LOCAL on Thursday 30th April 22:50
Hubris said:
I find heel and toeing a nightmare with the over-servoed brakes in my current car.
The first few times I tried heel toeing I nearly sent myself through the windscreen! Fortunately used to how sensitive the brakes are in my car. Can even left foot brake without scaring passengers now 
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