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