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Date: Mon, 11 May 2009 21:35:26 -0600
Message-ID: <3036fbc30905112035j30eca7bahbdb53caf25b594ca@mail.gmail.com>
Subject: RE: Initial Tuning - Today
From: Mike Fontenot <mikef@apexconsultingservices.com>
To: flyrotary@lancaironline.net
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Tracy,

>>All good except for (again) the MAP increasing.   My guess is that you
Assumed that the MAP went up when the RPM went up.   This does not happen
under these circumstances without increasing the throttle.  See previous
comments on this.  Think of the engine as a vacuum pump (it is).  If you do
something to make the engine (vacuum pump) turn faster WITHOUT opening the
throttle more, the MAP is going to go DOWN (more vacuum), not UP, as the
engine sucks more air through the same restriction.<<

Right, yes I probably did assume that when the RPM went up so did the MAP.
Good explanation, I'll be sure to observe that next engine run. Its not Cold
Fusion (power de novo).

>>Are you saying that the MI jumps around (up and down?) all the time, when
you move the mixture control, random direction  when you move the mix
control, or what?   Position of O2 sensor (too close to end of pipe, too
cold a position, etc), exhaust leaks, engine miss, bad connections, poor
ground, and other things can cause bad indications. <<

When I was in Mode 3, and adjusting the mixture knob, the direction of
change of the Mixture Knob and the increase and decrease of the Mixture
Indicator were in the same direction. It was just that what I thought was a
small change on the Knob resulted in a big change on the Mixture Indicator.
Same when using the Program KNob and Store button. One push to increase
injector flow rate there could make the Mixture Indicator go from position 3
of 16 to 11 of 16.   Movement of the Mixture Indicator always tracked the
Mixture Knob or changes via the  Program Knob, but I was expecting smooth
increases. And in Mode 3 that generally did not happy, they were larger
changes. I hate to use this term but 'twitchy'.  Again, I will run it up
again and watch, note these specific things.

I might try checking the wiring and putting a ground strap on the O2 sensor
as a first attempt.

-- 
Mike

================================
Mike Fontenot
Apex Consulting & Services LLC
Lakewood, Colorado
303 / 731-6645
mikef AT apexconsultingservices DOT com
================================

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Tracy,<br><br>&gt;&gt;All
good except for (again) the MAP increasing.=A0=A0 My guess is that you
Assumed that the MAP went up when the RPM went up. =A0 This does not
happen under these circumstances without increasing the throttle.=A0 See
previous comments on this.=A0 Think of the engine as a vacuum pump (it
is).=A0 If you do something to make the engine (vacuum pump) turn faster
WITHOUT opening the throttle more, the MAP is going to go DOWN (more
vacuum), not UP, as the engine sucks more air through the same
restriction.&lt;&lt;<br><br>Right, yes I probably did assume that when the =
RPM went up so did the MAP. Good explanation, I&#39;ll be sure to observe t=
hat next engine run. Its not Cold Fusion (power de novo).<br>
<br>&gt;&gt;Are you saying that the MI jumps around (up and down?) all the
time, when you move the mixture control, random direction=A0 when you
move the mix control, or what?=A0=A0 Position of O2 sensor (too close to
end of pipe, too cold a position, etc), exhaust leaks, engine miss, bad
connections, poor ground, and other things can cause bad indications. &lt;&=
lt;<br><br>When I was in Mode 3, and adjusting the mixture knob, the direct=
ion of change of the Mixture Knob and the increase and decrease of the Mixt=
ure Indicator were in the same direction. It was just that what I thought w=
as a small change on the Knob resulted in a big change on the Mixture Indic=
ator. Same when using the Program KNob and Store button. One push to increa=
se injector flow rate there could make the Mixture Indicator go from positi=
on 3 of 16 to 11 of 16.=A0=A0 Movement of the Mixture Indicator always trac=
ked the Mixture Knob or changes via the=A0 Program Knob, but I was expectin=
g smooth increases. And in Mode 3 that generally did not happy, they were l=
arger changes. I hate to use this term but &#39;twitchy&#39;.=A0 Again, I w=
ill run it up again and watch, note these specific things.=A0 <br>
<br>I might try checking the wiring and putting a ground strap on the O2 se=
nsor as a first attempt. <br>
<br>-- <br>Mike<br><br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>Mike Fontenot<br>Apex Cons=
ulting &amp; Services LLC<br>Lakewood, Colorado<br>303 / 731-6645<br>mikef =
AT apexconsultingservices DOT com<br>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>


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