How do you do stunts in the monster jam wii game?

I'm still trying to figure out how to do a doughnut. Coming up on a jump, I often will press boost just as I get to the incline, which shoots me up in the air. If you land on at least the back two tires and press boost, you will do a wheelie. Otherwise, to maximize points, I try to string together several stunts in a short time to up the multiplier. I find it pretty difficult. If anyone knows any other stunts, I'd love to hear them. Hold up on the control pad and turn