[Biturbos4] Wheel spin.

[Quincy Chiang]

EDL is part of the quattro IV system, whether you have ESP or not.  Like Keman said it's a reactionary system, it uses ABS wheel sensors to sence wheel spin.  It brakes the spinning wheel (with no/low grip) to in effect fool the open diff to thinking that the other side (which has more grip) is slipping in relative terms, so that the open would automatically send power to that wheel.  Clever, but it's no where close to actual LSDs in terms of effectiveness.

When quattro IV came out, Audi advertised that this new system is the first that can keep going with 3 wheels slipping.  Obviously you successfully foiled their claim!

Quincy

----- Original Message -----
From: northrup <northrup at crazybug.com>
Date: Wednesday, April 13, 2005 9:21 am
Subject: Re: [Biturbos4] Wheel spin.

> if you have ESP, I'd imagine that the "brake pressure" will be 
> automatically applied for you.... at least that's how it works in 
> non-audi 
> cars. 
> 
> As for me, i applied the brake pressure as Keman mentioned to get 
> going.  
> It worked - but i was disapponted to note the open differential 
> setup. 
> 
> I installed a Quaife LSD in a previous front wheel drive vehicle, 
> that 
> directed power to the wheel that had traction - it was quite a 
> nice 
> addition.
> 
> On Wed, 13 Apr 2005, Single Malt wrote:
> 
> > Does this apply to B5 models with ESP as well (does
> > ESP imply EDL)?
> > 
> > --- Keman <keman at interwolf.net> wrote:
> > 
> > > The front and rear differentials are open, all you
> > > had working in your
> > > favor was the torsen center differential, since
> > > there was more torque
> > > required to spin the front wheels than the rear, and
> > > the torsen will
> > > multiply torque to that the side with the most
> > > resistance.
> > > 
> > > The problem is, anything times zero, is still zero.
> > 
> > 
> > --
> > Single Malt
> > '01.5 S4
> > Garaged at 9200ft
> > just outside Denver, CO
> > 
> > 
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