My Hobbywing SC8's and 150A's will add fixed timing.

My Brushless Hobbies 120A will indeed turbo ramp on a sensorless motor. However, this turbo ramping is done by adding additional timing based on detected RPM, so it's not as accurate or efficient, however the effect is the same! Cranking the ramp up has made the poor Velineon 3500 in my Pede 4x4 very unhappy when I was screwing with it. :P