EDL questions

[Livolsi, Stephane]

Man, am I really this old?  I remember when me and my teenage friends
first invented the EDL concept (kidding, ok)by lightly applying the
brakes when you were stuck on a slippery surface.  Of course we did it
the old fashioned way, with our left foot rather than having a computer
do it, but it still worked. I still remember how surprising it was when
it actually worked.

Stephane


> -----Original Message-----
> From: Ti Kan [mailto:ti at amb.org] 
> Sent: January 26, 2004 5:52 PM
> To: rokas at umd.edu
> Cc: s-car-list at audifans.com; quattro at audifans.com
> Subject: Re: EDL questions
> 
> 
> EDL uses the ABS wheel sensors to determine the speeds of 
> each wheel. When under power and one wheel suddenly spins 
> faster than the one on the other side (indicating a loss of 
> traction), the EDL system will apply brakes to the spinning 
> wheel.  This, in addition to stopping the wheelspin, also has 
> the effect of transferring drive torque to the opposite side 
> through the differential, hence allowing that side (which has 
> traction) to get you going.
> 
> Note that the name "EDL" is a misnomer of sorts because it 
> doesn't actually "lock" any differential.  It achieves a 
> somewhat similar effect by applying the brakes on the side 
> that lost traction.  It only "engages" when such a condition 
> is detected.
> 
> EDL works in the front axles between the front wheels, as 
> well as in the rear axle between the rear wheels.
> 
> The driveline clicking sound could very well be the EDL doing 
> its thing as it uses the ABS brake modulator.
> 
> Summer tires are no good in the snow.  Definitely get them 
> changed if you're going to drive in snow regularly.
> 
> -Ti
> 2003 A4 1.8T multitronic
> 2001 S4 biturbo 6-sp
> 1984 5000S turbo
> 1980 4000 2.0 5-sp
> -- 
>  R 1 3 5  Ti Kan
>  |_|_|_|  http://www.amb.org/ti
>    | | |  Vorsprung durch Technik
>    2 4 6
> 
> Rokas Reipa writes:
> > Hey everyone. Having owned two FWD audis, I am ready to tackle this 
> > winter with my 1995.5 S6, which has quattro IV with EDL(no 
> diff locker 
> > button). I am curious to understand exactly how it works. I 
> understand 
> > the theory but am interested more in how I would know when it's 
> > working on this particular car. When does it engage and does it 
> > engage/disengage periodically or does it engage, lock the 
> rear/front 
> > diff and then stay engaged until 30mph or so? I'm curious 
> to test out 
> > if it works at all. It finally snowed here last night and I had a 
> > chance to try the car out. Every once in a while, there is a faint 
> > repetitive clicking coming from the driveline when applying 
> throttle; 
> > would this be edl? Noticed quite a bit of oversteer when applying 
> > throttle on curves; I guess this can be attributed to the crappy 
> > summer tires which will be changed soon. Any and all comments are 
> > welcome. Thanks!
> 
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