old hacker B50 8L on a BK9920???

Hello, i just wondered if i could run my old B50 8L onto my 9920 controler...
And if yes what will be the ratio to use and the ideal cell number?
Thanks for help, this old motor is dying in my toolbox, and i know it's a very good motor on 14/16cells... does it handle 5S lipo? it seems to have very high rev....