From time-to-time people ask about photographing race cars. I came upon this article interviewing race photographer Jamey Price. Page one is interview stuff. Page two (mid-page) on contains different suggestions and tips so I linked from page two. You can always jump to page one if you want the interview part.
Tips From a Pro: Racing Photographer Jamey Price | Popular Photography
Tips From a Pro: Racing Photographer Jamey Price | Popular Photography