double clutching

[daedalus]

Double-clutching, unless you drive a semi or an old car without syncros, is useless. Ignore what the movies tell you.

Now heel-toe downshifting. That IS useful, and fun too.

Double Clutching IS useful... It saves your synchros for one, and puts less stress on ALL the drivetrain components becuase they dont have to work as hard to catch up or speed down. You do it for it. I double clutch EVERY downshift. Watch option videos for togue attacks, or time attacks... look closely at their feet. Not only are they heel/toeing their downshifts, but double clutching them as well. Do you think they are doing it because the F&F told them to?

 

[BrianG]

...Whenever you put the gearshift into gear(regardless of your clutch being pressed), your transmission will be forced to spin at whatever speed the wheels are moving. Double clutching just get those gears going the right speed before putting it into gear(the same thing that properly working synchros do).
Read the whole article on how stuff works if you are really interested, it really helped me visualize everything that is going on...

Thanks, that was what I was looking for. I did read the "How Stuff Works" page, but I guess I missed that point. I shall have to try that sometime...

 

[RyanJayG]

they do it because racing transmissions dont have syncros and you HAVE to do it.

also, in a semi truck you don't HAVE to. you can do what is known as floating the gears (with out using the clutch at ALL) but you still HAVE to rev match or you will NEVER get it in gear. this is another reason why you NEVER NEVER NEVER shift while going down a hill in a semi.

 

[Brian MP5T]

Holy Crap...