WASD or arrows to drive. Press C to change car before the race starts. If you press up arrow or W and hold it at the right time on start you may get a perfect(charges 60 boost) or good start(charges 30 boost). Space to boost if the blue bar indicates. If you beak while turning, you will take the turn sharper and power slide which charges your boost faster.
Thanks to @griffpatch. I had to redo it because the map was wacky. This is my version of Griffpatch's 3d racing game. I added my own car design and morning, day, and night backgrounds. Sorry if you use KPH instead of MPH but I don't know how it works.