I Would like to give you some tips 
1) Fix the low FPS (film in slowmotion, then speed it up) (i think its not possible with wmm 

 )
2) use shift + F 
3) if you film a incam, the car should have a steering wheel 
 
4) hopefully you could film not just one cars actions, but many cars , really racing for the win.
5) use different camera angles.
Theses ar my little suggestions, its your choice to take them into account or not 
 
If this was a first try it's not so bad, if this wasnt your first try, not so good 
