Recently, there was a complaint about the MAP info displayed by
the Light Speed Engineering Plasma III electronic ignition with the
optional LCD monitor. While that situation may have been resolved,
there still are possible inaccuracies in the LSE display.
My own experience confirms this. For example, the RPM was off (low)
by various amounts (up to 50) at different engine speeds and this was confirmed
during dynamic prop balancing with its highly accurate external tach. My
VM EPI 800 engine monitor was within 10 RPM (its display steps in 10s)
To check any static MAP indication, one must remember it senses
absolute pressure. Thus, if one sets the sensitive altimeter to sea level
without the engine running, the Kollsman window readout (Hg") should match
the display of any MAP sensor. For example, when my certified altimeter
was set to sea level (0 altitude), the pressure readout was 29.2" and my
EPI 800 engine monitor also read 29.2" while the LSE LCD display showed
28.95".
I have also noted displayed timing discrepancies between the dual
ignitions of up to .5 degrees. Maybe some day I will check that
out...
It is possible that the internal sensor circuitry and logic is better
than the converted data sent to the display.
Scott Krueger
Lyc IO 320