[s-cars] future of awd

[colin cohen]

Interesting suggestion that might work for us.  We have found that if you trail brake, followed by a very gentle throttle application to about half throttle, you can avoid the ECU shut down.  Alternatively, brake in a straight line, followed by a turn in with a steady half throttle and again. although that does generate some understeer, I am not seeing the same ECU shut downs experienced when I use my A4 techniques.  Of course these changes in technique are taking place on the fly as we are competing on different tracks from week to week and I need to get back to the earlier ones to see if this works.  But where the corner dynamics are seemingly the same I have been able to successfully avoid this devastating power cut.  But its a strange technique and requires concentration to apply.

Colin

  ----- Original Message ----- 
  From: QSHIPQ at aol.com 
  To: sbpowers at gmail.com ; ccohen5 at compuserve.com 
  Cc: t44tqtro at gmail.com ; s-car-list at audifans.com ; keith at maddock.com 
  Sent: Thursday, April 26, 2007 11:30 AM
  Subject: Re: [s-cars] future of awd


  That technique works Steve for keeping the DBW alive, I've used it on the neu S4 and the M5.  IMU with the haldex, it uses the brake light input (and/or acceleromter) for disegagement, so he won't get any help there unless he finds the feeds for it.

  SJ
  In a message dated 4/26/2007 10:16:47 A.M. Central Standard Time, sbpowers at gmail.com writes:
    Colin -

    > However if you dare to LFB or try to trail brake and use more
    > than 10 degrees or so of wheel turn, the ECU shuts down so that you cannot
    > exit the apex until you get off the gas pedal.

    try "blipping" your brake pedal while keeping constant throttle.

    that technique works very well in our Mercedes. it may also work in
    the Audi, assuming a common vendor for braking controller.

    I discovered it during a long drive to Alberta, being quite pissed
    that the brakes would cut the accelerator. I've gotten good enough
    with the technique now that it's virtually seamless.

    of course going from the S6 to the ML requires a context shift.

    Steve






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