[V8] front diff( EDL or just plain open?0

Keith Maddock keith.maddock at gmail.com
Mon Dec 27 14:13:42 EST 2004


QSHIPQ at aol.com <QSHIPQ at aol.com> wrote:
> Well Keith, I'm all for calling a v8 EDL, cuz it's more so than the now atypical 
> ascription of EDL.  In a v8, it's an open diff until slip occurs, then it activates 
> the "electronic differential lock".  An open diff becoming a locked diff via  
> electronic activation.  Certainly purists would agree that's exactly the 
> definition of EDL.

True purists could also aruge that it would/could be ELD  :-P 
 
> As audi has it's own nomenclature for it's quattro systems, it's no surprise
>  that EDL has taken on a new meaning.  In fact, abs based traction control
>  isn't a electronic locking differential in any manner whatsoever, it's just 
> using heat (braking) to absorb torque on the slipping side of an open differential,
>  so that the other drive axle (T1 + T2 - on audis either front or rear, but not
>  over center axle) can support more torque.  That's not locking anything,
>  since the differential is still open by definition.  I'm sure even Keith M
>  would agree with torsen boy on this point.

Torsen-boy - Agreed 99.999%!  "AudiEDL" is definately not locking
anything at all.  I just wanted to make sure that there wasn't an
impression that the V8 Auto center diff was using ABS based Traction
Control  (in my world aka BTC - Brake Traction Control ).      If
EDL(BTC) is ever locking anything, that means it would have applied
full brake to both wheels, which means that myself, a colleague, or a
counterpart made a mistake in their code :)

The 0.001% : WRT AudiEDL(BTC) "on audis either front or rear, but not
over center axle" - would go to 0.000% if you changed audis to
"production audis"  :-P   BTDT.

Cheers,
Keith


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