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The reasoning for the suggested procedure is spelled out in the original archived message. The issue was that the controller did not take injector dead time into account. It is possible that later versions incorporated a dead time correction but I have
no way of knowing if they do. If that is the case, then there may be no advantage to using the suggested procedure. I proved this for myself by constructing modules placed between my EC2's and the injectors which added the dead time to the injector pulses
generated by the controller.
Steve Boese
The EC2 Manual clearly states: “Once you have the mixture correct at mid-power setting (~24” Hg) with Mode 3, you’re ready
to set the low throttle mixture in Mode 2.”
The a-e steps from Steve B’s email is his suggested simplified procedure, which I believe many have used successfully.
Your choice at this point.
Jeff
Hi there Steve
I am intrigued that c. directs to adjust the Mode #3 at a MAP below staging.
Tracy’s notes say at approx 23”.
I thought mode #3 would be for above staging.
I’ll go back and re read.
The following assumes that there are no problems with CAS or ignition:
After setting the controller back to all default program values and depending on the update version of your controller, the following excerpt from archive message #54156 of
Mar 6, 2011 may be of interest:
The tuning procedure then becomes the same whether the primary and secondary injector flow rates are different or identical:
a. Set the staging threshold at a MAP corresponding to the high end of the primary injector flow limit using mode 7. (For 40 lb injectors, about 20" MAP works well.)
b. Adjust Mode 3 to get a mid scale O2 sensor reading at a MAP just below the staging threshold MAP.
c. Adjust mode 6 to get a mid scale O2 sensor reading at a MAP just above the staging threshold MAP.
d. Adjust mode 2 for best operation at minimum idle MAP.
e. Adjust the mixture table throughout the useable MAP range using mode 1 or 9 to keep the O2 sensor reading mid scale. (To be honest, I skip step "e" and simply use the manual mixture control to adjust the mixture in cruise.)
"
Steve Boese
RV6A 1986 13B NA RD1A EC2
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