Double clutch for manual transmission

btc · 01-23-2006, 06:26 PM

Is it necessary to double clutch every time you up shift and down shift?

Sometime I double clutch when down shift. I never double clutch for up shift, you have to be very quick for up shifting.

To all manual transmission owner, do you double clutch at all ?

bavarian19 · 01-23-2006, 06:27 PM

Quote:

Originally Posted by btc

Is it necessary to double clutch every time you up shift and down shift?

Sometime I double clutch when down shift. I never double clutch for up shift, you have to be very quick for up shifting.

To all manual transmission owner, do you double clutch at all ?

I dont do it ever. I dont even think you need to with today's manual transmissions.

I do of course rev match (and have perfected it since I got my car in September) when downshifting, but no double clutch. Unneccessary

shimshimhada · 01-23-2006, 09:44 PM

It's unnecessary, but you can do it for downshifting to reduce the load on the synchros. Double declutching heel toe downshifting FTW!

BMW0 · 01-23-2006, 09:57 PM

Double clutching helps with transitioning to high revs (downshifting).

db17k · 01-23-2006, 10:21 PM

double clutching heel to toe is haaaarrrd! but awesome when you nail it coming out of a turn!

shimshimhada · 01-23-2006, 10:22 PM

Quote:

Originally Posted by db17k

double clutching heel to toe is haaaarrrd! but awesome when you nail it coming out of a turn!

What...? Don't you mean BEFORE entering the turn?

db17k · 01-23-2006, 10:29 PM

Quote:

Originally Posted by shimshimhada

What...? Don't you mean BEFORE entering the turn?

yes i'm drunk!

i only fooled around with it a few years ago and decided I'm gonna F up the transmission on my car if i keep this up.

ACZakka325i · 02-11-2006, 01:25 PM

sorry, but what exactly is double cluthing? Is that when you put it into manual, and then from manual to another gear?

ksfrogman · 02-11-2006, 01:32 PM

Only if your name is Lt. Frank Bullitt and you're chasing two hit men in a 1968 Dodge Charger.

shimshimhada · 02-11-2006, 01:32 PM

Quote:

Originally Posted by ACZakka325i

sorry, but what exactly is double cluthing? Is that when you put it into manual, and then from manual to another gear?

You can only do it in a car with manual transmission.

Quote:

Originally Posted by http://en.wikipedia.org/wiki/Double_declutch

The purpose of the double clutch is to match the speed of the rotating parts of the gearbox for the gear you wish to select to the speed of the input shaft being driven by the engine. Once the speeds are matched, the gear will engage smoothly. If the speeds are not matched, the dog teeth on the collar will "crash" or grate as they attempt to fit into the holes on the desired gear. A modern synchromesh gearbox accomplishes this synchronization automatically.

Easiest way to explain it is that you're using the clutch pedal twice for one shift up or down, instead of once.

ksfrogman · 02-11-2006, 01:36 PM

The only time I double clutch is when I want to downshift more smoothly or don't want to slide in icy road conditions when downshifting.

shimshimhada · 02-11-2006, 01:38 PM

The only time I double declutch is when I want to drive a 10-speed rig straight into my enemy's face.

01-23-2006, 06:26 PM	#1
btc Second Lieutenant Drives: 06/330i/SB/TERA/AL Join Date: Apr 2005 Location: Bakersfield,CA Posts: 234 iTrader: (2) Garage List 2006 330i [0.00]	Double clutch for manual transmission Is it necessary to double clutch every time you up shift and down shift? Sometime I double clutch when down shift. I never double clutch for up shift, you have to be very quick for up shifting. To all manual transmission owner, do you double clutch at all ?
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01-23-2006, 09:57 PM	#4
BMW0 Colonel Drives: AW E90 330i Join Date: Nov 2005 Location: Spokane, WA Posts: 2,059 iTrader: (0) Garage List 2006 330i [0.00]	Double clutching helps with transitioning to high revs (downshifting). __________________ 330i 6MT l 255 HP @ 5900 rpm 214 lb-ft Torque @ 3500 rpm l Alpine White l Beige l Aluminum l ZSP l 494 l PDC "Freude am Fahren" = "Joy to Drive"
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01-23-2006, 10:21 PM	#5
db17k Chicketeh china the chinese chicken, you have? Drives: 335ci hold out Join Date: Oct 2005 Location: San Francisco Posts: 790 iTrader: (0) Garage List 2003 S2000 [0.00]	double clutching heel to toe is haaaarrrd! but awesome when you nail it coming out of a turn! __________________ "In Soviet Russia car forks you!"
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02-11-2006, 01:25 PM	#8
ACZakka325i Lieutenant Colonel Drives: X1 3.5 M-Sport Join Date: Jul 2005 Location: CT Posts: 1,756 iTrader: (2)	sorry, but what exactly is double cluthing? Is that when you put it into manual, and then from manual to another gear? __________________ 2013 535i xdrive(Current) 2008 E92 M3 (Gone) 2006 E90 325i (Gone) 2002 E46 325xi (Gone) 1991 E30 325i (Gone)
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02-11-2006, 01:32 PM	#9
ksfrogman Major General Drives: E90 330i 6MT Join Date: Nov 2005 Location: Torrance, CA Posts: 6,749 iTrader: (12) Garage List 2006 330i [0.00] 2006 330i [0.00]	Only if your name is Lt. Frank Bullitt and you're chasing two hit men in a 1968 Dodge Charger. __________________
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01-23-2006, 09:44 PM	#3
shimshimhada Brigadier General Drives: Portal Join Date: Jul 2005 Location: Portal Posts: 4,840 iTrader: (2)	It's unnecessary, but you can do it for downshifting to reduce the load on the synchros. Double declutching heel toe downshifting FTW!
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02-11-2006, 01:36 PM	#11
ksfrogman Major General Drives: E90 330i 6MT Join Date: Nov 2005 Location: Torrance, CA Posts: 6,749 iTrader: (12) Garage List 2006 330i [0.00] 2006 330i [0.00]	The only time I double clutch is when I want to downshift more smoothly or don't want to slide in icy road conditions when downshifting. __________________
	0

02-11-2006, 01:38 PM	#12
shimshimhada Brigadier General Drives: Portal Join Date: Jul 2005 Location: Portal Posts: 4,840 iTrader: (2)	The only time I double declutch is when I want to drive a 10-speed rig straight into my enemy's face.
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