[s-cars] EDL Vs. Manual Diff Lock

[Keith Maddock]

Yes, Scott J recommended this to me.  Something about cutting a brown wire under the rear seat..

Scott, got details?  QS9000 approved work instruction?

Keith

****************************************************************
Keith Maddock, TRW Automotive,  Koblenz, Germany
Slip Control Systems, Systems Design, Traction Control
+49 (0)261/ 895 2474     -    -    keith.maddock at trw.com


>>> "James Murray (LMC)" <James.Murray at ericsson.ca> 16:38:53 16.01.2003 >>>
Maybe a silly question, but for Pre-95.5's can you disable the 15mph cut off?

Cheers, /J.

> -----Original Message-----
> From:	Keith Maddock [SMTP:Keith.Maddock at trw.com]
> Sent:	January 16, 2003 10:25 AM
> To:	s-car-list at audifans.com; jhull at cs.autometric.com; dohnal at hevanet.com
> Subject:	Re: [s-cars] EDL Vs. Manual Diff Lock
>
> Great summary Wayne!
>
> Jeremy, my personal suggestion is to buy a 95.5 with EDL and then install a Torsen.
>
> A locker is the best  for ultimate traction but only usable in very specific circumstances.  In all other circumstances, you're stuck with a open diff.
>
> Both EDL and Torsen work all the time (S6 EDL cuts off above 40mph I have read), and the synergy you get with the combination of both is about as good as you could get for our cars.
>
> I have a good technical paper from the ZexelTorsen boys that describes well the benefits of Torsen with EDL, I can forward to anyone interested.
>
> Cheers,
> Keith "EDLBoy by day, TorsenBoyJunior by night" Maddock
>
> ****************************************************************
> Keith Maddock, TRW Automotive,  Koblenz, Germany
> Slip Control Systems, Systems Design, Traction Control
> +49 (0)261/ 895 2474     -    -    keith.maddock at trw.com
>
>
> >>> "Wayne Dohnal" <dohnal at hevanet.com> 20:13:51 15.01.2003 >>>
> >Can anybody discuss the pros and cons of each? Trying to decide if it's
> >worth it to go for a 95.5 S6 Vs. a 95
> >Jeremy Hull
>
> Keith Maddock has discussed this at length in the past.  If you can find his
> posts in the archives that would be the best.  I'll try to hit the meat of
> what he said, but he works with this stuff and explains it the best.  The
> only Pro of EDL is that it automatically engages.  So if you hit some
> slippery stuff unexpectedly, it's there to help you when you might not have
> engaged the diff lock.  It's also cheaper to manufacture, since all of the
> hardware is already there for ABS.  It's only 'a simple matter of
> programming' which, of course, is free (sorry, Keith, I couldn't resist).
>
> Once the diff lock is engaged it is superior.  If one wheel has zero
> traction, all of the torque on the axle will go to the other wheel, the
> ideal situation.  With EDL a maximum of 50% of the axle's torque will go to
> the wheel with traction, while you're heating up the brake pads on the
> slipping wheel with the other 50%.  But you will never achieve even 50% of
> the torque to the wheel with traction because the EDL must let the slipping
> wheel rotate some to test if it slipping or not, resulting in further
> inefficiency.
>
> I'm amazed how fast my S4 will accelerate on packed snow with the diff
> locked.  And it does it in a straight line, too.  But I can't help feeling
> that most people would rather have the sport steering wheel than a locking
> rear.
>
> Wayne Dohnal
> 1994 S4
>
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