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D-180 Tachometer rapid fluctuation (Read 112 times)
Jul 4th, 2018 at 7:39pm

Closterman   Offline
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Since some flight, I have rapid fluctuation of the rpm. The weird thing are that all are ok on one flight, and the seconf flight I have the problem...

I have a EFII Electronic Ignition and both ECU are connected to the D-180 for the tachometer input. I have check both wire and all look good....
« Last Edit: Jul 4th, 2018 at 7:39pm by Closterman »  
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Reply #1 - Jul 4th, 2018 at 7:40pm

Closterman   Offline
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I forgot to tell that all working good for the last 3 years (240 h)..
 
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Reply #2 - Jul 4th, 2018 at 7:40pm

Closterman   Offline
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See the video for a better explanation of the problem :

https://www.youtube.com/watch?v=LSRR6Gts3LE&list=UU7lQNiAFyQe2FS3yD4JlhWg&index=...
 
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Reply #3 - Jul 4th, 2018 at 9:04pm

jakej   Offline
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IF your connections are good the I'd add a 30KoHm resistor in the rpm line to the Dynon (if you don't have 1 already) worth a try & it's very a cheap 'test'.
 
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Reply #4 - Jul 5th, 2018 at 10:18am

Closterman   Offline
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I didnt have a resistor.  Whats the purpose of the resistor ?  From the EFII manual, the ECU give a square pulse to the Dynon.  I will try to unplug 1 ECU to see what will happen, and may be found which one are faulty...
 
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Reply #5 - Jul 5th, 2018 at 6:07pm

jakej   Offline
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resistor is generally used as a 'fuse' for voltage output ignitions & magnetos & also has a dampening effect with ripple current.
 
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