I know all the theory about this: either brake or start you turn in on the carpet (using the outside line or furthest away form the rostrum) This means that you are either going a bit slower or have already made the most impottant part of the turn (when the most "G" force occurs as the carchanges initial direction) while traction is good. Then it's just a case of easing the car round the corner with both throttle and steering.
But that's in theory! While most of the time I can put this off, if I'm in a battle for a place or get a bit over-excited then every bit of basic driving knolege goes out of the window and then I'm quite capable of driving like a t*$t and hitting every wall aroung the track