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Bill,
I will give you my understanding of setting the
fuel mixture I did a couple of weeks ago. I reinstalled the Renesis after
overhaul and the EC3 made a trip to tracy's shop where he replaced one
chip. I also changed my injectors, now I have 4 yellow injectors, two
primary and two secondaries.
I adjusted with mode 3 as you did, probably not as
much.
Then I adjusted mode 2,I turned the program knob
clockwise, then I pressed the program store switch about 10 times because
the mixture was too rich below staging point, I wanted to get a leaner mixture
below the staging point. That gave me a descent situation where the
auto mixture adjust (mode 9) would not go too far off the zero
point. I think one has to spread the mixture difference between
below and above the staging.
First I changed the staging point to between 15 and
16 inches manifold. The factory staging point is set at 19 inches.
This does not work for me because 19 inches of manifold pressure is at about the
rpm I use when I come in for a landing. I do not like the engine to
hesitate when I am getting ready to land, I got other more important things to
do at that time.
I used the auto adjust quite a bit around the
staging point before it got to be acceptable.
After using auto adjust, there is a step in the map
table between positions 44 and position 45, that is where staging occur in my
case. I still can tell when staging occurs but I now find it quite
acceptable.
Rino Lacombe
----- Original Message -----
Sent: Sunday, February 21, 2010 8:33
PM
Subject: [FlyRotary] Some assistance
Please!
First, some news..
I recently redesigned my cooling system due to unable
to run the engine for more than about 20 min at high idle without it
overheating. Now I have the good problem. Granted it was cold..low
60s. But I was not able to get my oil above about 145 and the water
above 185! I ran it full bore till I got tired of holding the
brakes! I still need to do some work balancing the air between the oil
and water. And I didn’t have the cowl on, so the problem is not
completely solved, but I am on the right track!
Now the question.
I have the Renesis that has the very small red
primaries and the very large blue secondaries. I recently changed them
to all yellow. This removes the need to balance the flow so much when it
stages. The total output is very similar between the two systems.
Now I have a larger flow when on the primaries and the secondaries kick in
with a smaller change. I removed the large secondary option using mode
6.
So I checked the mixture at 22 inches manifold
pressure and it seemed fine with mixture at center setting so I deemed that I
didn’t need to change the fuel flow with mode 3. BUT when I started to
let it auto tune, I noticed that it was setting all the bins to -127 until
after it staged, then it started to build the graph that you normally
see. It stages at 20 inches manifold pressure. Is that the
recommended pressure? I expected 15”??
So my question is…Should I set the mode 3 at a lower
setting? This will affect the entire range so I am concerned that I will
not have enough fuel at WOT if I do that. Should I make an adjustment
using Mode 2? I don’t really understand what dynamic range is??
What are your thoughts?
Thanks,
Bill
B
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