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aprazer
Joined: 24 Nov 2006
Posts: 93
Location: Boise, Idaho
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 Posted: Tue Nov 18, 2008 10:30 am Post subject: Tach scatter |
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Scenerio: 3300 Jabiru; Dynon DK180; Pulse/Revolution values are set (at) 6; tach wired to alternator with 1 amp fuse; Problem fluctuating tach readings on taxi testing.
Readings: At idle 2000+/- RPM -- hand held tack shows 1050+/- 10;
As I add throttle Dynon RPM drops to 1600;
Slowly adding more power tach reading comes up then drops until it reaches full throttle and reads 2300 (static should be 2800).
Has anyone had this problem? If so, how did you solve it? Any and all help will be greatly appreciated!
Thanks,
Mack Kreizenbeck
601XL N990MK
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The poh-oh-unemployed farm boy from Idaho |
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DaveG601XL
Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh
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| Posted: Wed Nov 19, 2008 7:33 am Post subject: Re: Tach scatter |
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Mack,
I have the same A/C, engine and Dynon D180 as you. My tach reading is correct and rock solid. Lets see if we are hooked up the same.
My alternator signal tee's off of one of the two big output wires up stream of the voltage regulator. This off-take wire has an in-line fuse holder and hooks up to the Dynon white/green wire for "left tach." In the Dynon set-up, double check your 6 pulses per rev set-up is on the same side tach you are wired to.
Make sure you do not have any bad connections or shorts in this circuit. Maybe also change out your fuse to another one.
Good luck,
p.s. Unless you have a climb prop, I doubt you get 2800 static RPM on the ground. I see 2600 with the 64ZK49 that Jabiru supplies with their FWF kit.
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David Gallagher
Cincinnati, OH area |
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