you have to check the RPM on the 8 motor vs 8.5 motors - they have different part numbers i believe -
hard to say what they do there in the UK - its not the same here - so in the UK maybe they program all the PM the same for both motors 6.5 snf 8.5 -
sunrise dosnt - or if they do - its not allowed in the system - when they config. a chair here - the items are punched in a system - if the system rejects it or the item - thats it - it wont be allow to be in your chair -
how old are your motors there - are they recent with in a year ? they should be different than the older ones - if you have both - you can compare the heat fins on the outside of the motors - or even inside - the software could be tweaked to allow it to run more before rolling back - i know it can be done in the software anyway - but what i am saying is - its possiable something is different between the two - at least the software settings may be from factory -
either way - even if they are not different or maybe one setting is - they wont mix and match here - maybe in the UK there - its not as strict and the 120A could be preset to work on the slower motors
i could understand if it was the other way around - lets say using the 8.5 motors on the lower end PM90A - that may not work out as well
but i dont see any reason for the slower motors not to work on the 120A - BUT - maybe there is something settings different between the two - unless you can compare both stock settings - it could be -
can you share your stock from the factory settings on 6.5 motors 4 pole ? before you changed anything
i like to compare them to mines - older motors and new ones when i get the chair - both would be 8.5 -
MWD FWD call for the 8 motors - RWD get the 8.5 - could be same motors - just one slowed down in settings also -
i have to check a qm720 - a friend has one - i be curious - just to check stock settings - i know here in the US - they have been updated - upgraded - hardware wise - and maybe software tweaked to work with the hardware changes to get a more robust efficient motors -
Since Sunrise dosnt allow getting Rnet 120A with a 6.5 motor - must be a reason - i dont see any reason why - other than the software may be different between the two and are tweaked for each set different -
what would happen if you had the 90A which was updated also i hear to work better with the 6.5 motors -
what would happen if you used a 90A with the 8.5 motors - ? burn it out sooner at worst - but it would work and maybe fine also
if you have stock settings from a 6.5 motor 4 pole - can i see them ?