How do you make your car do a wheelie in wheelie competition?

Wheelies are fairly simple. All you need to do is have a high powered RWD car. Something like a Corvette or Mustang or Camaro. The what you'll want to do is decrease your REAR tire/tyre pressure to about 20 to 25% of the maximum value. Also decrease front Downforce to zero (if you can, it's been a while since I've played) and rear downforce to about 75% maximum value.

Then, when in the Wheelie competitions, try to get the best grip level possible in the burnout stage by carefully using the throttle to keep the rev counter within the green zone.

Once that's done, and the competition starts, just hit the throttle and keep shifting in the green "perfect" shift zone. If you start to see the nose dipping, try using NOS to add extra power and get extra distance from your wheelie.

Using the Corvette ZO6 with Stage 4 Engine and Transmission parts and the rest Stage 3 parts, I could wheelie the entire 1/4 drag strip and them some. I never lost a wheelie competition with that car.