Use heavy riders (Bowser, Wario, Donkey Kong), as they have the best top speeds and there are no items or other riders to slow you down. This minimizes the impact of their slow accelerations Perfect the start boost – hit the A button right when the “GO” pops up to speed up fast and shave precious seconds off your time. Learn all the shortcuts on the track. While you won’t need them to unlock Birdo, you will need them to unlock other characters from time trials. [1] X Research source
Remember, you need to do a time trial on 16 different courses, not just 16 trials. If you are sure you raced 16 courses, but can’t get Birdo unlocked, race a full Grand Prix. You should unlock Birdo when you are done. [2] X Research source
You can also race 1,350 unique races (any race, any time) in any mode to unlock the pink dino through sheer time spent playing. [4] X Research source
Because she is medium weight, she can push around light drivers, like Baby Luigi. She will, however, still get knocked around by heavies like Bowser.
Mini-Turbo: This is the boost you get after a successful drift around a corner. Birdo has one of the highest mini-turbos in the game, though not the highest. Off-Road: Birdo will only lose a moderate amount of speed when off the track. While not as good off road as some other drivers, like Yoshi, her moderately high off-road stat means she can handle the occasional deviation off road without major repercussions. [5] X Research source
Mini-Turbo: This is the boost you get after a successful drift around a corner. Birdo has one of the highest mini-turbos in the game, though not the highest. Off-Road: Birdo will only lose a moderate amount of speed when off the track. While not as good off road as some other drivers, like Yoshi, her moderately high off-road stat means she can handle the occasional deviation off road without major repercussions. [5] X Research source
Best Karts: Wild Wing or Daytripper. Best Bikes: Mach Bike or Sugarscoot.