In general your shutter speeds are too high, making the cars look parked and "staged" for the shot, rather than fast moving objects. In some of your cornering shots, like this one, the horizon is tilted just a touch. For this, either keep a very straight horizon, or tilt the horizon in a more obvious manner and also in the direction that makes the car appear on-camber in the corner rather than off-camber. Also you might try boosting the shadow regions on the photos (in Photoshop, try a shadow-highlight filter option and start at 10% shadow boost).
This is a pic that really needs either a very shallow depth of field (so those people in the background are not in-focus and sharp), or preferably a slow shutter to motion blur the background. So much is in focus and there is so much in that background that your eye is not drawn to the car. A slower shutter helps that immensely by horizontally blurring that background. And the blur in the wheels imparts that feel of speed you are looking for.
Canon 1D Mark II, 70-200/2.8L-IS, shot at ISO 100, Tv mode, 1/160 shutter, f/18. 280mm focal length (full zoom plus 1.4TC). At this point on the track the car was moving approximately 95 mph, maybe a touch more. This gives you an idea of what type of blur you get at those speeds and that shutter speed. The other thing I wanted to mention was at long shutter speeds like that on bright days you bring in a lot of light. Notice even at ISO100 I was at f/18. This is where neutral density filters can help (blocking 1 or 2 stops of light can get you down to a more reasonable f/8 to f/11). A circular polarizer is good for one stop of light as well, but you have to be careful on how its oriented.
I edited my post directly above your reply to put a few technical details into the panning shot. Camera mode, shutter speeds, etc. The panning takes a lot of practice, to precisely follow the car while that shutter remains open, and even with practice you'll throw away a lot of shots that didn't quite work right. But its worth it when you nail it.
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A former sports shooter
Follow me at: https://www.flickr.com/photos/bjurasz/
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Canon 1D Mark II, 70-200/2.8L-IS, shot at ISO 100, Tv mode, 1/160 shutter, f/18. 280mm focal length (full zoom plus 1.4TC). At this point on the track the car was moving approximately 95 mph, maybe a touch more. This gives you an idea of what type of blur you get at those speeds and that shutter speed. The other thing I wanted to mention was at long shutter speeds like that on bright days you bring in a lot of light. Notice even at ISO100 I was at f/18. This is where neutral density filters can help (blocking 1 or 2 stops of light can get you down to a more reasonable f/8 to f/11). A circular polarizer is good for one stop of light as well, but you have to be careful on how its oriented.
A former sports shooter
Follow me at: https://www.flickr.com/photos/bjurasz/
My Etsy store: https://www.etsy.com/shop/mercphoto?ref=hdr_shop_menu
A former sports shooter
Follow me at: https://www.flickr.com/photos/bjurasz/
My Etsy store: https://www.etsy.com/shop/mercphoto?ref=hdr_shop_menu