Not necessary but... (archive)

Yes the synchros will do the job but double-clutch downshifting is a much NICER way to do it, especially if you are going 4th to 2nd or something like that. I have a 1990 M3 and with that powerband, I downshift A LOT. I just learned the double-clutch technique several months ago and it has made a big difference. When done correctly the shift-lever almost seems to get sucked into place, it's that effortless. I must admit, I was intimidated at first as the whole process seemed complicated and hard to keep track of. After trying it, however, I found out that it is quite easy and satisfying.

I found these articles helpful in learning how and why to double clutch:

Synchromesh Transmission

In addition, I noticed, as I became comfortable with double-clutching, that the first clutch application happens almost simultaneously with putting the car in neutral and seems like only a preparation for shifting. Then, the actual shift happens when you rev the engine, clutch, and shift. Breaking it down this way might make it easier to get your mind around.

Good luck.

-Jon

Double clutching is not necessary with modern-day transmissions. They teach that at the driving schools because the open wheel cars they use have synchro-less trannies. All you do is blip the throttle between gears to try and match revs. You only depress the clutch once. Blipping ensures a smooth downshift and prevents possibly having the rear end come around on you during sudden unmatched engine braking. You're supposed to downshift and brake hard in a straight line before your turn-in point and then while turning towards the apex immediately get power back to the wheels and accelerate as you pass the apex to maximize exit speed (more important than entry speed). Some people teach trail-braking (light braking in a turn) to help balance the car depending on the car setup and the turn. Sorry I got kind of carried away. Just my 2 pennies.

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