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Message
I set the EC2 to mode 7, ran the engine up to 15.5” MAP based on
the gauge, and pressed the set button; to try to be sure the stage point was
properly set. Didn’t seem to make any difference.
It still bothers me that
you see a change in the engine when turning off the secondaries below the
staging point. Since the staging default is 15", setting it at 15.5"
is still very close to the same thing. Try setting the staging point up to
18" or so, just to make sure it's so far away from the MAP you're running in
your tests that it can't possibly intermittently stage. I keep mine up
there all the time, and I think Tracy might be doing that as well. With
mismatched injectors, you'll find that the higher you set the staging point, the
better the transition will be, since the engine is more tolerant of mixture
changes at higher power settings.
I'm not surprised that
the secondaries (MSD 525) are running smoother than the primaries (Mazda
550) at low power. One of the problems with larger injectors is that you
can't cut the pulse width down enough to limit the fuel for idle
settings. Also, when running minimal pulse widths, the reaction time
of the injector becomes a factor. If there's any variation in the opening
and closing time of the injector (partly sticking, worn out, etc), this will
cause big problems at idle, and lesser problems as you increase the power
setting.
Checked the staging relay and secondary power circuit is “on” when everything
is off (relay not energized). With engine off, EC2 on, relay is energized
and secondary power is off (not sure this is normal). However; with engine
running and MAP below stage point, relay is not energized, and secondary power
is “on” (not normal). Relay coil connects to +12 and to pin 35, which I
understand closes to ground when MAP is below staging point.
What "staging relay" are you
referring to?
Well, now that the plane is flying again, I
guess I have to clean up all the limbs and downed trees in the yard.
Rusty (priorities in
order)
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