FW: [s-cars] S6 (UK spec) questions

[mlp]

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Thanks Feico

mlp
  -----Original Message-----
  From: FvAMI at aol.com [mailto:FvAMI at aol.com]
  Sent: Tuesday, August 20, 2002 7:56 AM


  Slow it is. And with only a resolution of .1 bar getting anything better
than +/- 0.1 readings is not ideal. The components are probably +/- 5% and
the reference voltage probably has a +/- 5% variation. With that in mind a
+/- 10% deviation could exist between display units.

  It is basically an absolute pressure gauge measuring the voltage output of
the MAP.  The MAPs are pretty accurate so unless you changed it to a 3.0 bar
unit or you have some type of bad connection between the ECU and the
instrument console it should blow away the readings on a "differential"
mechanical pressure gauge. The readings will differ unless you have a near
linear mechanical gauge and are at 1 bar during the time of the comparison.
Most mechanical gauges measure differential pressure between the ambient
pressure and the pressure coming out of the car. The "stock" unit measures
absolute pressure regardless of ambient pressure.

  Best regards,
  Feico van der Laan
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