As silly as this sounds I yell instructions to my self.
"Get on the gas NOW, don't touch the brakes it's wasting time, Now, BRAKE hard, turn, go that way, get over there in that line, don't coast, get on the gas or on the brakes etc etc.
Some of the other guys on the track think it's funny but it does make me breath and concentrate on my riding.
Doesn't make me any faster though....................