Danny,
I used to do a lot of commercial motorsport photography when I was young, it's a great subject to shoot, and here are my comments;
It's cropped too tightly, but shutter speed is good, gives some indication of movement and speed, shows some advertising but not the driver / navigator.
It looks like you're on the inside edge of the car which is good from a safety point of view, but being on the outside edge, getting the car coming into a bend will give a lot more dramatic impact and will be of more commercial value; be careful on the outside edge though, the car will naturally slide in that direction and weaker drivers can lose control with deadly results for photographers - use a long lens (200-300mm) and choose your spot wisely!
Try and be slightly above the car, capture the bonnet and driver / navigator.
Pre-focus on a point in the bend that you know the car will pass through (good drivers will follow the same line for handling and speed), it will save time for snapping.
Following the above should give you:
- A greater coverage of the car (bonnet and side)
A view of the driver / navigator
Action / Impact
Isolation of the car (because of the long lens)
A greater succesful hit rate
Get the above right and the shots become quite marketable to magazines (motor sports), the drivers and navigators for personal use and obtaining sponsorship, and the sponsors for promotion and advertising.
Good Luck.
Phil