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Originally Posted by shakran
If you properly double clutch you press the clutch down and shift out of gear. No load on the tranny. You then blip the throttle to match the engine revs to the speed of the gear you're about to go into, and press the clutch again while shifting into that gear. Still no load on the tranny. You let the clutch out with the engine already going the speed it's supposed to be going in that gear.
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I was assuming (incorrectly) that you were meaning more like speedshifting, which doesn't use the clutch between gears.
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Originally Posted by shakran
I'm not trying to discredit you here, but your advice goes against the advice of just about every automotive expert out there. The closest I could find are the Car Talk guys, who say it wears on the clutch (by which they mean the clutch spring) more but say nothing about it wearing out the synchros faster.
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Explain specifics on how my advice goes against every auto expert out there? Because everyone that I know, and talk to about it agrees with me.
and no, it doesn't put stress on the synchos, it uses them as properly designed. Otherwise we wouldn't need synchros at all! There are small amounts of wear on the gripping surface of synchros, but again, in my entire career, and after discussing this with another friend of mine who has been doing transmissions for over 20 years, syncros last much longer than you seem to believe. I have seen cars, trucks, and utility vehicles with transmissions having over 200K miles on them, burned out clutches, but the syncros looked as good as new.