PMag and RPM on a D180/120

[putco]

Hi All

I have a Pmag in my Lancair with a Superior io360 and a D180 with EMS120. When l select the pmag to check it, the RPM shoots to 3100 and never settles. The RPM l feel is out anyway, what pulse count should l have set in there?

My manifold pressure is wrong too, are these sensor issues or wiring?

Thanks

 

[GalinHdz]

Hi All

I have a Pmag in my Lancair with a Superior io360 and a D180 with EMS120. When l select the pmag to check it, the RPM shoots to 3100 and never settles. The RPM l feel is out anyway, what pulse count should l have set in there?

My manifold pressure is wrong too, are these sensor issues or wiring?

Thanks

The P-mag tach out  (pin 6) transmits 2 pulses per revolution so either set the EFIS to count 2 pulses per revolution or set the P-Mag to transmit 1 pulse per revolution. I also found that on my Skyview/EMS I had to use the enclosed 5.1v Zener Diode (between P-mag pin 6 and pin 1) to prevent the RPM indications from going haywire every once in a while.

An incorrect manifold pressure reading is normally caused by a misconfigured MAP sensor within the EMS settings.

 

[Dynon]

What are you seeing on manifold pressure? The leading cause of incorrect readings there is getting the wiring incorrect on the sensor. That leads to "pegged" values.

 

[putco]

Hi and thanks for the replies. I'm getting 14.2 unpowered at sea level and at runup not much more than about 16.

 

[jakej]

As DS said, you need to check the wiring    the connector on the MAP sensor actually has pins A, B & C shown on it as part of the moulding at manufacture, they can be hard to see as they are the same colour as the rest of the plastic.

Jake J