Quote:
Originally posted by yellowline
Proper double-clutching (on downshifts) isn't useless. Anything to reduce wear on synchros is good. When making a turn off a main road, I double clutch before selecting 2nd. If I match it well, it slips right in; otherwise, I have to hold the gearshift against 2nd for a couple seconds until it goes in. On upshifts, my 944 shifts fairly nicely into 2nd when many other 944s would grind, so the synchros are still good. I'd like to keep it that way.
Skip Barber recommends double-clutch downshifting in his books. I haven't gone through his program, but I've browsed one of his books, and it mentioned the usefulness of double-clutching on downshifts.
Heel-and-toeing or clutchless shifting are probably useless and possibly dangerous techniques on the street, though.
Edit: Wow, a lot took place while I was typing this...Ignore this if you want...
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Double clutching is far too slow, useless and fraught with potenetial disaster driving on a track with a modern tranny. Too much to do. It may be of some value going 5 or 4>2, but proper heel/toe makes this unneccessary.
I used to D/C my 915 2>1 and it is of some use with that box, and other older boxes with poor synchro. The 915 was absiolutely fine in all other situations without D/C.
Flat shifting is a good way to shorten drive line life, true. Heel/toe however, is not useless on the street. Its kind to the car, its smooth, it keeps the car balanced and its good technique. Once you learn it, you will always drive that way.
Only in MHO ofcourse.