Gunter,

Under normal driving conditions there is probably not muched to be gained by double clutching. On the track however there are usually places where there is a heavy braking zone and a big change in wheel speed after pushing in the clutch at high RPM. This is where you really need to double clutch to prolong the life of the syncros. Most advanced to expert racers use this method and the really good ones can rev match very close to perfect.

Saving the syncros is not the only benefit on the race track as rev matching keeps the car balanced when down shifting. I realize that you can rev match without double clutching but why not go all the way if you can.

-Andy

If you intend to double-clutch at the track, isn't it good practice to double-clutch on the street to develop the skill? After rebuilding my 915, I double-clutch every downshift, even in my '88 Honda which is a POS. It's a good habit to get into as it doesn't do any damage, prolongs the life of the synchros, and develops your driving skills for more serious use. Is it necessary?? Heck no, not as long as your synchros are alright.

Dan