Seasons Greetings

  Matt,

  I was doing my annual note organizing and I came across the files on
  the Nissan data. On the Excel table I have a notation the data is in
  mg/sec.

  On the Nissan Infinite g20 graph the bottom line represents voltage and
  the numbers should read from left to right as follows.   0.1 , 0.5,
   0.9,
  1.3, 1.7, 2.1, 2.5, 2.9, 3.3, 4.1, 4.5, 4.9, 5.3, 5.7, 6.1. Please
  correct Paul's graph as it appears the numbers are off.

  Again after 4.8v the sensor doesn't have any real resolution but
  those airflows are so low it doesn't matter.

  Let me know if you need anything else.

  Presently I have the sensor mounted down stream from the ROTREX Super
  charger and will bring the feed into a simple flow bench that  can match
  the throttle and or the rotor housings, intercooler etc.

  Cheers

  Doug


Are you sure the voltages read are correct? My experience is that more
volts gives more fuel. If the airflow is greater, the engine would require
more fuel, so the voltage to the ECM should be higher. If the sensed volts
is taken across the wrong wires the scale would be backwards.

Dale Davies

Here is how the RX8 mass air flow sensor works.

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Here is a diagnostic test from the Ford EFI book.
Idle  .8 V
20 MPH  1.1V
40 MPH  1.7V
60 MPH  2.1V

Attached is the output voltage from a Vane Airflow Sensor
similar to the RX7 2nd gen unit.

Paul Lamar