1) Double Shifting? Do you mean Double Clutching? It's the act of pushing in the clutch, taking the car out of gear (say out of 4th), taking out the clutch again, revving the engine to approximately the RPMs that it needs to be at to match the transmission speed of 3rd, pressing the clutch back in, putting it in 3rd and releasing the clutch. It's a fast process but takes a long paragraph to explain. It's very similiar to what is called "rev-matching" except the clutch is pressed and depressed twice. Double Clutching isn't really necessary these days, but it was common practice on older vehicles that didn't have synchronizers, or can be used on vehicles with worn down synchros. (Hot-shoe race drivers can "rev-match" during hard braking through courners by heal-and-toeing, where they reach over to the gas pedal with their toes, while still braking with their heal, and press the gas to match revs with the engine.. very slick and I'm told difficult to master..)
2) Power shifting is simply shifting gears while keeping the gas planted, kicking the clutch as fast as possible, and throwing the shifter into the next gear as quickly as possible. It's very hard on the synchro's but provides with very quick shifts, and good drag racers love to do this. Just don't mess up because it needs to be timed properly otherwise you'll over-rev your engine for the brief moment it's in neutral
3) Proper shifting basically? Don't redline the engine, smooth shifts etc...
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