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Message-ID: <4EBA1FB8.7090906@nc.rr.com>
Date: Wed, 09 Nov 2011 01:37:44 -0500
From: Ernest Christley <echristley@nc.rr.com>
Reply-To: echristley@att.net
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Any tuning suggestions?
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Last night I turn the sound recorder on the laptop on while I did a 
tuning run.  I played back the data in MegaLogViewer while recording the 
screen, and then matched it up to the sound.  I was hoping I could get 
suggestions for improving the tune.

The first issue is the hard start.  The only time I purposefully turned 
the engine off was at the very end.  It runs pretty smooth, once it is 
warmed up to about 120*F, but below that the AFR will go off one end of 
the scale or the other, indicating that fuel isn't getting burned.

http://www.youtube.com/watch?v=F3pYW1lOcTo&feature=youtu.be

The top graph has RPM, manifold pressure and throttle position.
The second graph is injector pulse width time, AFR, and fuel flow.
Spark advance is on the third, along with mapDot and tpsDot.  Those are 
measures of how quickly the map and throttle position are changing.  The 
computer uses them to calculate how much to extra pulswidth to add on 
acceleration.
The bottom graph show the oil temp, coolant temp and manifold air temp.
Instantaneous values for each line show up at the center bottom of each 
graph.
The last line at the bottom is a run time timer.

The bouncy balls to the right are the tables that the computer uses to 
calculate the injector pulse width and spark advance.  Lowering the 
numbers in the VE table tells the computer that the engine isn't sucking 
as much air as theoretically possible, and the computer will lower the 
amount of fuel at that combination of RPM and manifold pressure.  If the 
ball is between cells, it uses a weighted average of the adjacent ones.  
It just pulls the number from the spark advance table and sends it to my 
EDIS modules.