If you want a decent racing game then buy rFactor, www.rfactor.net
. All of Simbin's cars from GTR and GTR2 have been converted, plus countless other mods have been and are being produced all for free. Look at post 39 here http://wrracing.net/forum/index.php?topic=211.15
and you will see my current ride.
is the best place to download the mods, but not all are listed, currently there are around 200 tracks available too.
If you want info on a race sim then take a look at www.rscnet.org
most have a forum here.