When I then turn on the EC-2, the
manifold pressure increases to 32.9. This seems peculiar, have you
noticed anything like this?
Bill Schertz
KIS Cruiser #4045
When the EC2 is off, it is using the
reading from the sensor in the EM2. When it is on, it is reading the
sensor in the EC2. I have also found considerable disagreement on these
sensors. I also found that I had to change the calibration on the MAP
pressure channel on the EM2 to get the correct reading (with EC2 on, we don’t
care what the sensor in the EM2 is reading). I have no idea why the calibration
should be different on different units that use the same sensor; but there it
is. You can get a vacuum gage (actually a pressure gage, so you have to
subtract from atmospheric) at a reasonable price from McMaster-Carr, or I could
loan you mine.
Also, it should not necessarily read the
barometric pressure; you have to adjust for altitude. Barometric is
equivalent sea level (or something like that).
Al