Flightdek D180 RPM readout problems

[03733]

My Dynon 180 was installed by an """""expert"""" 2 years ago. The aircraft, an Osprey homebuilt (engine is a O320 Lycoming} is finally ready for initial test flying but I am having problems with the RPM readout. It seems to be normal at idle but under reads at anything over 1000 RPM. When doing a mag check the left mag reading is all over the map jumping between 500 and 2000 while the engine RPM appears to be constant. The right mag readout is consistent but to low.
On both reading seems to be way lower than actual.

I am not a mechanic and the only one on the field will not work on Dynons as he has no experience

Can anyone give me a suggestion. Is there an installation manual available on the Dynon site. I cant seem to find it

Thanks in advance for any help

Norm

 

[DBRV10]

Is there an echo in here............ ;D

reposted........

Download the installation manual and read about setting up the sensors, and the TACH.

If you go to setup/sensors and TACH you can set the number of pulses per rev. This is most likely set at 2 or 3 or something, and it may need to be 1.5

Depends on your number of cylinders.

It should be easy to fix once you read that and try it. Wink

 

[dynonsupport]

All the user manuals and install manuals are on our site. You can get to them from the front page, under the support tab and then product documentation.

A direct link is here:
docs.dynonavionics.com

It probably isn't as easy as David says. You say it's normal at idle but then is messed up at over 1000 RPM. This isn't a linear effect like adjusting PPR would be. You are probably either missing the ballast resistors that we ask for in the install manual, or you need to add larger ones. We cover this in the install manual.

 

[DBRV10]

Not as easy as I say......... speaking from experience here, we had the PPR set wrong (not sure why may have been default) and at idle the values looked about right but when at takeoff power it was a long way off. If you have 2 V 1.5 its not so obvious.

........and on the bigger Lycs the 100K resistors are essential, not the ones supplied.

So it may not be as easy.......but it may not be that hard either.

Cheers