Could someone kindly explain "Double clutching" to me? Thanks in advance.
12-11-2001, 06:10 AM
#3
Member
Join Date: Mar 2000
Posts: 3,511
Likes: 0
Received 0 Likes
on
0 Posts
Re: Could someone kindly explain "Double clutching" to me? Thanks in advance.
Moving the shift lever to neutral and releasing the clutch for a second to spin up the gears in the tranny - in theory to help match the gear speeds without a syncro to allow a shift without gear grinding.
12-11-2001, 06:32 AM
#6
Member
Join Date: Mar 2000
Posts: 3,511
Likes: 0
Received 0 Likes
on
0 Posts
With an Audi? Never - unless a syncro is gone or I spent too much time between gears
The syncros in an A4 transission eliminate any double clutching need unless it is WAY cold or you spend too much time in neutral with the clutch pedal pressed between gears, up or down shifting. When the clutch is pressed AND you are in neutral this allows much of the tranny to spin down and when you try to select a gear the syncro for that gear has to try to spin up from a near stopped state - you may notice this as a resistance in the shift gate, or a gear grind if you force it. At that point releasing the clutch for a second while in neutral will spin everything back up allowing the syncro to match gear speeds.
In a vehicle without syncros where all the gears are turned by the input shaft when in any gear you only need to manually match engine and gear speeds at each shift (up or down). This can be done by good timing of selection and engine speed. If the tranny only spins all gears off the input shaft when in neutral, then you need to double clutch.
In a vehicle without syncros where all the gears are turned by the input shaft when in any gear you only need to manually match engine and gear speeds at each shift (up or down). This can be done by good timing of selection and engine speed. If the tranny only spins all gears off the input shaft when in neutral, then you need to double clutch.
12-11-2001, 06:32 AM
#7
New Member
Join Date: Oct 2001
Posts: 116
Likes: 0
Received 0 Likes
on
0 Posts
Re: when would you do this? during a downshift? upshift? when shifting aggresively?
the only use this is for is for vehicles with no synchro.
also - its useful for cars with enormous turbos like rally cars - as when you are downshifting, the engine loses rpm, therefore the turbo loses boost, therefore itll lag for a moment when you accelerate again - so, many drivers do the 'heel and toe maneouvre' where you break with your toe, and blip the throttle with your heel to keep the turbo spinning whilst in neutral for a tiny moment, then slam it into gear again and enjoy the boost!
also - its useful for cars with enormous turbos like rally cars - as when you are downshifting, the engine loses rpm, therefore the turbo loses boost, therefore itll lag for a moment when you accelerate again - so, many drivers do the 'heel and toe maneouvre' where you break with your toe, and blip the throttle with your heel to keep the turbo spinning whilst in neutral for a tiny moment, then slam it into gear again and enjoy the boost!
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
IllWil
A4 (B5 Platform) Discussion
12
11-13-2002 07:51 PM
T-28-Quattro de VT
A4 (B5 Platform) Discussion
4
08-27-2001 03:54 PM