[BiturboS4] Re: piggyback ecu

Ti Kan ti at amb.org
Thu Sep 11 21:49:38 EDT 2003

Yeah, I know about this, it's basically replacing the software in the
ECU via the diagnostic port.  This was not what I thought when Daniel
mentioned "piggy back" ECU... it sounded like an additional ECU that
communicated via the diag port.

2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Laboratories, Sunnyvale, CA. USA
  ///    ti at amb.org
 //////  http://www.amb.org/ti/

California Fields writes:
> Ti, APR is working on (or maybe even has released) what they call "direct
> port programming". It's like chipping your car except that you don't need to
> physically mess with the ECU. Instead, you just plug into the VAG port and
> send data to the ECU (kind of like flashing the ROM). This way, the dealer
> will never know and the software can be changed easily.
> Carter.
> >From: Ti Kan <ti at amb.org>
> >To: dbc112 at yahoo.com (daniel chisholm)
> >CC: biturbos4 at audifans.com
> >Subject: [BiturboS4] Re: piggyback ecu
> >Date: Thu, 11 Sep 2003 09:19:46 -0700 (PDT)
> >
> >daniel chisholm writes:
> > > Has anyone heard of the piggyback ecu? It would be very nice to have a
> >plug in ECU through the Vag-Com port under the steering wheel.. a much
> >cheaper solution to a new ecu and chip
> >
> >No, where have you heard of such a thing?
> >The diagnostic port is only that... it only has a relatively low speed
> >serial interface to the various modules, and does not have direct access
> >to all the sensors and controls that the real ECU has.  Thus if there is
> >such a thing as a "piggy back ecu" it is probably quite limited
> >in what it could do.
> >
> >-Ti

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