Ok, admitting to being a bit lazy after flying with
the Ec2 for approaching 8-9 years now, I decided to read the manual
(again?).
Here is a summary of my understanding of the EC2
Fuel related Modes - subject to clarification by those (he?) who really
understand the modes. This brief summary IS NOT a substitute for
reading the manual in detail. Any errors, mistatements, lack in
understanding of this summary are mine alone, any suggestions for
clarification welcomed!
Mode 0 - Normal running mode
- pushing the program store button is this mode does nothing - setting
the program select to this mode prevents inadvertent "adjustment"
of the EC2 during flight.
Mode 1- MAP adjustment mode - permits you to
adjust the Fuel correction factors for each bin (manifold pressure
points) by using the Left Mixture Program Knob and then storing the
adjustment in the Fuel Map by pressing the Program Store Button.
This is an absolute adjustment to the current fuel MAP
values, in other words setting the Program Mixture control knob all the way
CCW (lean) and pressing store would place a minimum value (zero?) in that
bin. Setting the Mixture control knobe all the way CW (rich) would store
a maximum value (255?) in that bin. This contrasts to the Mode 9
adjustment of the MAP table which is apparently incremental from the
current setting. Note: Injector Diagnostic Mode: With
engine off pushing Program Store Button in this mode will trigger the injector
diagnostic mode - make certain your fuel pumps are all OFF!
Mode 2- Copy MAP mode - used to copy controller
A programming to controller B.
Mode 3 - Fuel Injector Flow Adjustment - used to
compensate in the MAP table for the use of larger injectors
(I.e. When all four injectors have higher flow rates
than approx 460 cc/min) than the stock 13B N/A engine.
If you can not adequately lean your engine with the
larger injectors, it appears that this mode can be used to "adjust the
flow" to an acceptable range.
Note: I once tried going from my stock N/A 460
cc/min injectors to 550 cc/min injectors - I could never get the engine to
idle properly - always too rich at one end or the other, so I went back to
stock. If I had been smarter and read the manual more closely, I think
adjustment in this mode might have solved the "too rich" idle
problem
Mode 4 - Front Rotor Mixture Adjustment - Used to
compensate for small differences in the mixture between the front and
rear rotor - adjust front rotor to match EGT of rear rotor - Note from
the Ec2 Manual:
You can accomplish this by monitoring the EGTs of the two rotors
and getting them to match as closely as possible. A digital EGT gauge is
almost a necessity to read small differences.
Mode 6 - Secondary Injector Differential
Adjustment - Used if secondary injectors have larger flow rates than
primary injectors - this may result in an overly rich
mixture above the staging point.
This adjustment is used to compensate for the larger
secondary injectors. Normally, you would observe the Air/Fuel
Ratio indication and would need to lean the flow below staging point so that
it would not be overly rich after staging. At least that is what I think I
read
Mode 9 - Adjust MAP table entry -
Similar to Mode1 in making adjustments of MAP table, but is used to make
even finer adjustments.
While Mode 1 settings make absolute value changes to
the value in the bin of the MAP, Mode 9 is used to make smaller
relative adjustments to the MAP value in the bin being adjusted. The
closer the Mixture knob is to 12:00 the smaller the change, the further CCW
(lean) or CW (rich) the greater the relative adjustment. Read the
instructions for details.
Mode 9 is recommended for making any IN-FLIGHT
changes to the MAP table as the effects of this mode's changes
are far less dramatic than being in MODE 1 and having the knob fully CCW when
you push the Program Store Button {:>). The engine will cough for a
moment (as it goes full lean) and then shift to a more satisfactory fuel MAP
value bin before continuing to run. I don't about most of you
- but I'm getting to the age that I don't like the engine to cough for
even a moment.
Did I mention read the manual for a fuller description
and understanding? There is a lot of stuff in it and most of us will
need to read it and attempt making the adjustments before it really
sticks.
One purpose of this summary, is that if my understanding
is in error - then I WANT to know!
Ed