450 heli multiblade with Apm 3.1

Hi all,
im setting up a trex450 with apm 3.1, i would like to install pixracer in future but apm was in the drawer…
the multiblade head is phased at 90 degrees, someone knows if i should change some parameter?
I have made all set up correctly (i think…) so in the next few days i should take off…