Ptero made this excellent post about how to master the slip, shifting with only light use of the clutch, eventually not needing to use it. His post is so inclusive it seems all is needed is to master the instructions.
Quote:
Originally Posted by Ptero
For pulse and glide, you'll want to master the slip. Always be gentle. Ham-handed people should avoid learning the slip in their own cars. You can break off gear teeth if you get clumsy.
SLIP
Get a tach if you don't have one.
Go 65.
Make note of the exact rpm. e.g. 3070
Go 55.
Make note of the exact rpm. e.g, 2750
Now, at 65 mph, touch the clutch and shift into neutral.
Take your foot off the clutch and off the gas.
Your idle will drop to around 500 rpm.
Coast down to 57.
Now bring your rpm from 500 to 2750. Be steady and precise, no hunting up and down.
As you hold the rpm steady at 2750 and your speedometer drops from 56 to 55, quickly jab your clutch (just a little - NOT to the floor) and slip the stick into high. A good slip shift will not make any noise except for a little "snick".
This technique works for all speeds and all gears (upshifts require doubleclutching) but you have to memorize the match points. To learn match points in big trucks that I'm not familiar with, I cheat by pulling the shift lever lightly against the spinning gears. A light accelerator foot, with an eye on the tach, will find the match point. Little transmissions with synchros can make this hard to do.
Once you are good at this, you will find the clutch is unnecessary, as well as the tach. It's like playing a musical instrument.
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shifting without using the clutch #1