Hey Edwin,
Having a problem with the G27 and Dirt 3. Wheel is pulling hard to the right no matter what. Works great with Dirt 2, Grid 2, Grid, F1 2012, F1 2013. But I have to put the "Wheel Strength" to "0" to get rid of it and that kills the feel of slip.
As far as the game, I am using the "Ultra" preset and the game runs without a hiccup and looks gorgeous. If I can get this game to work as well with the G27 as the other Feral racing titles it will be perfection!
We haven't seen that here but I'll ask someone to have a look see if it's something in your settings. Do you have anything none standard (like a FFB plugin from 4 years ago installed?)
Edwin