Te37's great choice of wheel!
now if that car was black or red, and it had time attacks...WHA!!!
pics look good, alot of backround in your pics though, IMO with car pic's the idea is to bring the eye right to the car and the cars details.
the backround images brings the eye all over the screen. i'd dull the exposure and darken the backround slighty so the car is the total subject of the pics, but with a little something for the eye to see in the back.
all of this is my opinion and my choice for what cars pics should be. there your pics though so do what feels right.