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