ORIGINAL: Gaspar
That's not correct.
The ecu calibrate the idle power every and each time that the engine arrive to idle during startup phase. Just in the moment of that the rotor RPM arrive to idle the ecu store the current pump power as "idle setting" for this particular run.
The reasons that could give a high idle at startup are:
1) Transmitter incorrectly programmed, sending a signal above the IDLE value adjusted during the radio setup. Typical on digital trim radios.
2) Too agresive fuel ramp at startup. The engine arrive at idle RPM overfueled, the ecu calibrates the pump power but the engine is receiving more fuel, so it continue accelerating despite at the pump power not increasing.
Gaspar, my radio has mechanical trims, and after initiating the start sequence I did not touch the trim or the throttle stick. Idle was 65k rpm, it stayed there for about a minute then the PW value slowly decreased, it took about another 2 or 3 minutes to get down to 45k rpm. So I don't think either of the reasons you have given will explain the high idle or why it took so long for the ecu to reduce the PW value to get it to the correct idle. I then did the 5 seconds throttle up and 5 seconds throttle down to help it learn any new settings it needed. For the rest of the day and the following day the idle was correct at every start.
Harry