i usually drift at about 35-45 mph,

when my suspension is done I think I could go farther

 

My thought on drifting is
Getting the car sideways(all 4 wheels sliding) befor the corner
Entering the corner drifting(as you are above)
And then exiting the corner and straighting up or keep it sliding for the next corner.

 

Ooops...still a valid definition...