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Old 10-22-2006, 04:01 PM   #1
187bosshog
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Double Clutching

so what is double clutching


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Old 10-22-2006, 04:05 PM   #2
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Its from back in the day before Syncros were put in the transmission. What its is is as follows,


Starting with car in first..

Drive to desired RPM

Clutch in shift to neutral

Clutch out

Clutch back in

Shift to second.
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Old 10-22-2006, 04:28 PM   #3
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its for people who live their lives a quarter mile at a time
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Old 10-22-2006, 04:42 PM   #4
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Basicly only Truck Drivers still double clutch. BTW bigjordan you should be shot for rembering that and I should be shot for knowing where it came from.
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Old 10-22-2006, 04:45 PM   #5
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Quote:
Originally posted by bigjordan
its for people who live their lives a quarter mile at a time
bullshit no one likes the tuna here!
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Old 10-22-2006, 05:00 PM   #6
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You can do it that way or when your down shifting as well. It gives you a lil boost cuz theres no lag between. When the rpms have to catch up. It works really well.
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Old 10-22-2006, 05:31 PM   #7
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[gravely, no-rules voice] ...and for those 10 seconds or less, I'm free [/gravely, no-rules voice]

Double clutching has its biggest use if your synchros stop working like they're supposed to. Like my old Neon, which didnt like to grab reverse, a double clutch gets everything realigned (I dont know the mechanical explanation, but that's how it works).

I USED to double clutch to downshift, there are 2 problems with that. First, whatever small amount of wear you save to the clutch material, you put a lot more stress on the TO bearing. Secondly, if you can RPM match double clutching, you can do it faster clutching once, and if you are actually matching correctly, it's still smooth as silk.

Until your snchros start to give out, I see no reason at all to live your life a quarter-mile at a time.
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Old 10-22-2006, 06:05 PM   #8
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Synchros match the speed of the mainshaft to the speed needed so the gears mate in the transmition. When you double clutch, the clutch engages in neutral to the mainshaft but not to any gears. Now that the mainshaft is spinning slower than the previous gear (revs fall while shifting, duh) the mainshaft slows enough to be able to put it into the next gear, thus the synchros dont need to be used.

On downshifting, you blip while in neutral to get the engine/mainshaft speed up to where it needs to be. If done correctly you can go down two gears smoooth as buddah. If you ever played "need for speed underground 2" they simulate blipping on downshifts while dring.

In simplest terms, double clutching slows the mainshaft to the point needed to where synchros dont need to be used. Thats why you have to double clutch farm equipment, no synchros.

I think thats how it works anyway.
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Old 10-22-2006, 06:37 PM   #9
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dont worry about it...its useless for most people. go for it if you want to save your synchros some wear, but its not for racing, its not for drifting, its not for modern transmissions...dont do it, vin diesel doesnt care about you
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Old 10-22-2006, 08:18 PM   #10
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i only do it it the porsche, because after 150k of hard driving, the synchros could use a little work.

lol, heel-toeing is much more usefull.

and double clutching used to required on all cars, before synchros.

in fact, i beleive bentley and rolls-royce used to send chaffuer drivers who would drive their cars to a special training thing, so they learned to double-clutch so smooth that they wouldnt disturb a wineglass or sometthiung like that.
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