Give me this weekend and I can try to put together a video in relation to the "perfect drift" and what it is, and how to achieve it.
But to hold you off look at these figures I drew up.
Each figure should explain itself, but the basics of a "perfect drift" is taking a corner where you are just on the edge of your grip circle. Now, most cars this circle cannot even be a circle at all, I'm sure NASCAR since they go fast and turn left have more of an oval on their side, where as a IHRA drag car will have a tall oval. And then an F1 car just has the biggest circle of all.
Also, your tires get the most grip when they are slightly in slip...
Like I said, give me until the weekend, as I have mid-terms in my classes, but once those are out of the way I can work on a video.