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John,
Perhaps Tracy will jump in here,
but until then here is my shot.
I get a different A/F indication
just by moving the Mixture control a 5-10 deg rotation my indicator lights will
move up or down. First, how movement of your manual mixture control affects
your indicator depends on where you have the programmed fuel mixture set.
In other words, if the your programmed value at the operating point is already
on the lean side, then even a small leaning by the manual mixture control can
cause the engine to stumble due to over lean condition. One the other
hand, if your stored program value at that operating point is set toward the
rich side, then you may be able to bring your manual mixture control all the way
to 0900 position and the engine will still be getting plenty of fuel.
So the programmed value and the manual
mixture control work in conjunction. It still appears to me that your
programmed value is way rich. But, I understand you don't want to run too
lean with a turbo under the bonnet and risk detonation. But, still you
should be able to program it to get a nice (no soot) condition while not under
boost and still not risk detonation.
I know this is very unlikely, but at
one time there was an error in the EC2 wiring diagram that was in Tracy's
published instructions on how to hook up the wiring. The effect of this
error was to render any program modes past two (I think - it may have been past
mode three) inoperative. I played with some of those modes for months and
told Tracy that if there were any change it was too small to separate from my
imagination. Well, several weeks later, Tracy announced the wiring error.
Soooo, just make certain you have the correct wiring diagram for the EC2.
I don't think even if you were miswire from the old diagram that it would be
having the kind of effect you are seeing - my EC2 ran just fine with the wiring
error, I just couldn't play with some of the modes. Mode 0 worked
fine.
See my suggestion below in response to your no
change with mode 1
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
Turn to mode 1. Move mixture to left. Move program knob to left.
Press button. No effect. Press button 4 times. Still no effect on AF reading
or engine. I turned on the cold start switch. No effect on the engine or the
AF reading.
John, something is
definitely not right here. If you move the program control mixture
control all the way lean (0900) and still get no change in your A/F indicator
there is a problem. Turning the program mixture control to 0900 and
pushing it will most of the time cause the engine to die from lack of fuel,
even with the manual knob set near 12:00 or more. It appears that your pushing
the program store button is not actually storing your setting in the program.
Even if the A/F indicator was all screwed up and not indicating properly, you
should easily notice changes in the engine operation condition due to the
change in fuel it is getting.
Try this(on the
ground please). Set your throttle so you are getting around 3500 rpm
. Select mode 1. Put your manual mixture control at 12:00.
Place your program mixture control a 09:00 and push the store button.
Note if there is any change? RPM? EGT? EGO?, Sound? With my aircraft, you
would without doubt notice a change, it will immediately run lean with the A/F
off the bottom of the scale and will likely die. If nothing changes, try
moving the manual mixture control from 12:00 to 0900 (lean) as well.
With both your program value set to max lean and your manual mixture set to
max lean the engine should definitedly stop running.
If none of
this has any affect, then I suggest you recheck your wiring AND your connector
pins. Check to make certain that none of those fine strands of wire have
cross over and touched another pin in the DIN connector. Either with a
magnifying glass or at least run something around each pin to make certain you
don't have two connected that should not be.
Ed.
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