Grind in Grand Prix mode to earn car parts. This is the best way to boost your cars after getting decent car parts. These tournaments are only available at limited times. You can also earn coins and blue coins by doing this.
Cars
When selecting a car, consider its size. Shorter cars have an advantage. Larger cars take up too much of the track and gives added difficulty when turning. Smaller cars offer more room to not hit a wall, even with poor handling or sensitivity.
Cornering
Because you do not have manual brake control and your car slides easily, turns may be difficult at first. For tight corners, start your turn early and let off the gas before going into the turn.
Sliding
Extend your slides to get a speed bonus for power sliding. To acquire this bonus, swipe up from the acceleration icon. If done correctly, you will get higher speed and also handle the curve better. If there are other competitors nearby, make sure you go around them or you will end up giving them more speed.