I think these are a pretty good start. With a little bit slower a shutter speed then you would catch the wheels moving which helps the cars look more active. Im also a big fan of very low angles with rally shots, you can see that most of my shots on my thread from the galway rally are shot from a crouched/prone type position instead of standing. It gives a much more pleasing view of the car as you are on level with it.
Above the car works but only if you can get significantly higher than the car to amplify that effect.