^^ yup, spot on SDK, those are the lenses he uses.
the 10-20mm is a very wide angle lens, so if you are going to be very close to these cars, ie no more than a few meters, then this would do you. However, due to its largest aperture being f4, low light might cause you some problems without a tripod. The 18-70 is a good idea. If you have a nikon body then this lens you simply cant go wrong with. It's very sharp, quick to focus, but its max aperture size is only f3.5, which isnt a vast improvement over the 10-20mm.
If you want to go prime lenses, (im not sure on the quality of these lenses) then the sigma 24mm f1.8 might work, it has very good low light performance, and i dont think it cost a fortune either. Also being 24mm in focal length, its neither too narrow nor too wide, allowing you some freedom in where you position yourself.
EDIT: Sorry just noticed you have the Sony body. Ignor where necessary
