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Message
Each cycle of the surging takes a little over 1 sec. RPM
surges buy 300-400 RPM. Manifold pressure fluctuates by 2-3 inches, and
the mixture monitor fluctuates the full range of its scale.
Hi
Dave,
I recall having some
problems with this in my early running of rev-1, and it was just a tuning
issue. You have to reduce the mode-2 setting to minimum, as Tracy
suggested, and work your way down very slowly. Once the surging starts,
and the MAP is wandering around, pushing the set button is a shot in the dark,
since the mixture will be changed for the MAP at that instant. I had to
work with mine a bunch to finally get it working well.
My suggestion would be
to start at the lowest throttle setting that will run smoothly, then reduce the
MAP .5". If this is surges, adjust the mixture, and throttle as necessary
to make it smooth, at exactly the MAP you wanted. Save this
mixture, then reduce the MAP another .5", and repeat until you hit the idle
limit. That's about how I finally got mine to work before, but I
admit to not taking the time to get it right on the current
version.
Also note that turning down the fuel
pressure is basically the same thing as what John Slade suggested, which was to
reduce the overall injector setting. As long as you haven't
run out of travel in your mixture control knob, neither of these steps should be
needed though.
Good luck. I know it isn't as simple
as it sounds to get it right.
For the record, my #1 feature request
for the EC-2 would be the ability to save/restore the calibrations to/from an
external source (PDA, laptop, etc). I'm hesitant to fiddle with
calibrations for a test, when I already have things running well, because I
don't want to have to take the time to get the calibrations back in line
when I'm done.
While we're at it, my #1
feature request for the EM-2 is data logging to the iPAQ.
Cheers,
Rusty
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