Quote:
Originally Posted by Pkush
The synchro part...tell me? I'm a new MT driver and I'm curious.
Also tell me why would you double clutch in a car with synchros? I was pretty sure it's useless?
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The answer is to use the engine to spin up the clutch disk rather than making the snychro do all the work. So say you're coasting at 45mph in neutral (engine is idling, clutch is out) and you want to put it in 4th. If you clutch in and push the stick into 4th, the synchro will have to spin up the clutch disk from idle speed to the 4th gear engine speed (probably like 3k rpm or there abouts). Thats alot. Instead first rev the engine to 3k, then put the clutch in and quickly slide it into 4th, if you matched it perfectly it should slide in with essentially no resistance or knotchyness at all. You're basically doing the 2nd half of the double clutch technique.
I usually use double clutch if I'm skipping gears when down shifting. Going from 6th to 4th is hard on the 4th gear synchro. Or you can move the stick from 6->5->4 without actually clutching out in 5th. That will utilize both the 4th and the 5th synchro to spin up the input shaft. In these cars, you're right, you shouldn't try to shift into 1st unless you're going 6mph or slower (unless you double clutch).