I think he only thing wrong here is that there is no impression of movement.
If you had tracked the cars so that the background was blured it would have been better IMO, but still a nice shot.
Like to see the shooting data as these are the 'subjects' I enjoy taking photos of. Looks like you had some decent,but not optimum lighting and a good point to pan from~to... What I think might work well here is using a monopod (required here around any trackside photo locations (Infineon) and a shutter of about 1/80 and closed down to get that speed... In any event Its great action and some more motion blur with the sponsors showing is real desireable.
Nice, sharp image. These cars are either stopped, or you used such a fast shutter speed to get the tires perfectly frozen. Either way, I'm not sure if I'm getting much of a sense of 'action'.