I have a Canon EOS 300d and I want to use it in some of the manual modes at National Day on Sunday, I have used it for a month or so now on the automatic modes which I am ok with, but obviously, these are not the best for shooting cars on a race track (sports mode is too fast a shutter speed and doesn't give a very good perseption of motion)

What mode and settings would you recommend for moving cars on track?

I have the EF-S 18-55mm and EF 75-300mm lenses!

I think the available modes are the same as most other Canon EOS cameras!