Plead Tach reading on new EMS install

mem235

Member
Joined
Oct 20, 2022
Messages
33
Hello. I added second hdx and ems. I have lycoming 6 cylinder. I think default config file is for 4 cylinder and consequently my tach readings are high. Is there a default calibration number for a six cyl, using p-lead pickoff. Was wondering what formula used to convert plead magneto pulse to rpm. Guessing that for each magneto there would be 6 pulse per revolution but ive been breathing fuel tank calibration fumes so not sure how to make sense of plead pulses.
 

GalinHdz

Active Member
Joined
Mar 3, 2008
Messages
716
Location
KSGJ/TJBQ
Is your EMS set to receive 1 pulse per revolution or 2 pulses per revolution from the Mags? If set wrong then your tach will read wrong.
 
Last edited:

airguy

Active Member
Joined
Nov 10, 2008
Messages
942
Location
Gods Country - west Texas
From the install manual -
Tachometer pulses/revolution are set in the Engine Information Wizard – SETUP
MENU > HARDWARE CALIBRATION > EMS CALIBRATION > TACHOMETER
CALIBRATION.
 

mem235

Member
Joined
Oct 20, 2022
Messages
33
I havent looked tach calibration yet, is the pulse adjustment there?
 

mem235

Member
Joined
Oct 20, 2022
Messages
33
Update: the pulse/rpm setting of 1.5 resulted in accurate tach indication. 1.0 works for 4 cylinders and 1.5 works for my 6 cylinders. Obviously, 6/4 = 1.5
 
Top