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"Double-clutching with throttle: I doubt that one can match the synchro speed accurately; it's either to high or to low when using throttle to double-clutch. I can see some advantage in double-clutching without throttle. Without any accurate research either way, who is to say? I can point to several vehicles in my life time with well over 250k with good synchros not using double-clutch. There are myths out there like: "Don't re-set your odometer when still rolling", etc. These myths die hard. By all means, double clutch with gusto; half the people are doing it because it's cool."
Gunter,
To each his own.
What is the advantage in double clutching without throttle? Unless I'm missing something, all you're doing is momentarily interrupting power flow during the middle of a down shift. This is the same effect as downshifting w/o double-clutching.
I agree there are vehicles with many miles on their gearbox with still functioning synchronizers. However, I have serious doubts those gearboxes are in a Porsche. I have not done any formal statistical analysis, but perhaps someone here can offer their experience with their 250K mile 901 or 915 gearbox.
Yes, there are myths and wives tales about auto tech., but double-clutching is not one of them. Maybe Wayne shouldn't be writing a book on gearbox repairs if synchro wear is not an issue.
I'd like everyone's gearbox to last a long time. Unfortunately, 1st and 2nd gear synchros (901/915) do not enjoy that longevity under "normal" circumstances.
Respectfully,
Sherwood
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