Can't raise mot_pwm_max after controller change

ArduCopter
1

Hi,
This question spawns out of a another tread here Suddenly Copter behaving wildly, altitude drops and overall loss of control

Via logs I realised that arducopter was limiting rc_out to 1960 pwm with my Taranis calibrated to max 2006 rc_3 (thrust).
I’ve changed to a controller who’s rc_3 max is 1890 and now via logs I can see ardupilot is limiting rc_out to 1840.
So I’m losing 120 worth of pwm range/power.
I changed mot_pwm_max to 2000 thinking this would raise the limit on rc_out but it remains at 1840.
I’d like to know why it’s still limited and what I can do to raise this.
I realise that I can probably set the ESC limits to compensate but this would be sacrificing some resolution and is a bit of a work around I’d rather not do.
Is there something I’m missing?

2

Anyone know the logic behind ardupilots max motor output? Seems to be an overlooked subject. Especially with calibration of your trust stuck determining the output of your motors. That’s a lot of multi rotors our there not getting the most from their motors.