I don't have much experience with the 8j, however, to turn the governor off, I think you need to take channel 5 (might be 7, one is gyro, one is governor. On spektrum with sats only, 5 is gov) and play with the value until the gov turns red.
However, no matter what color the governor is, unless you have a sensor plugged into it, the governor will do nothing. Mainly only works on nitros.