Strange, that's the first thing I tried. But it didn't seem to install any tracks from the series. So I figured I had to add the base to get those.
When I fire up rFactor currently it has the V8factor intro film/branding etc. It has all the cars, skins etc. But when I start a V8 supercars championship it just takes me to regular tracks which were already in the game, and no Australian tracks (Bathurst, Adelaide, etc) are there.