Double Clutching??

[DirtRydin]

I've heard of it...but what is it?? please xpalin
thanks,
zach

 

[Howser03]

Its used primarily for trucks without synchronized transmissions. You use the clutch to take it out of gear, let it go, then use it again to pop it back into gear. Makes shifting smoother. Tried it in my car, not worth the effort I think. Never tried it on my bike, but I don't think it would be necessary.

 

[yzeater]

They mentioned it in the Fast and the Furious...they also used the term "granny shifting" and it reminded me of Thump! (P.S. My vote went to Okiewan)

 

[MONKEYMOUSE]

yeah Mostely you dubble shift when racing a car or driving a big truck or a truck w/ a large load.
(granny shifting is only hiting the clutch once each time you shift)

 

[dave186]

You cant do it on a bike, unless you have a neutral between each gear. Why would you want to double clutch in a race car? That would slow shifting down a ton.

 

[MONKEYMOUSE]

It wont slow you down at all realy it will make you faster, its not the same princabull(sp?) as with a truck. Insted of holding in the clutch in the whole time your shifting(witch it time that you wont be on the gas) you just tap it twice that way your still accelarting(SP?) the car the whole time. I don't realy know how to explain that very well. But you do need to do it fast or it will slow you down not make you faster. ( any car racers that could explain this for me?)

 

[fatty_k]

If Im not mistaken, isnt double clutching only used/useful in down shifting.

ie: going into corners; in a car of course.

 

[soquel]

In a car you push the clutch in while entering the corner and while you are shifting gears you raise the rpms to the powerband so when you let the clutch out, you won't be bogging the engine but speeding away.

 

[MONKEYMOUSE]

Good you know what I was trying to say ! :) It also works in upshifting thoe

 

[orion163]

Originally posted by soquel
you raise the rpms to the powerband

What color powerband are you talking about?

 

[fatty_k]

Probably the blue one. Thats the best, IMO.

 

[01KLXer]

As said you double clutch a truck to bring the input side of the tranny up to speed. You push in the clutch and pull out of gear to nuetral and let the clutch out, you are now in nuetral. Then you push in the clutch and shift into the approprate gear...this is the hard part of learning to drive a large truck, to many gears so little time. Sense there isn't an available nuetral between say 3 & 4th double clutching is tough to do.

 

[riddick2424]

they use double clutchin when racing so they can build up some rpms in the short time the engine is in neutral when shifting, thats why some people peel out when they are shifting and the the car is already going. its all about keeping the rpms high

 

[Jaybird]

I've had a few years expreience driving a 25 ton(83,000lbs GW) truck crane. This particular vehicle had a 13 speed Navistar tranny. No way to drive the beast without using the double-clutch method for shifting. The sycronization of those trannys are not like what we are used to in cars and bikes.