Force Feeback/Vibration from Game

Just wondering what the FFB from the game is?
I'm using the RaceRoom controller RRDC2 - [www.raceroomstore.com]
Which has vibration motors in the handles.
At the moment I'm getting vibration with increasing steering lock, but only audio when going across rumble strips.
I've got "enable force feedback" selected, but what is "wheel pulls left"? I couldn't find anything in the GP4 manual.
I've downloaded GP4 Tweaker and will have a look.
I'm not expecting FFB as with a wheel, but would like rumble from strips etc.

do get ffb on the curbs, you need to enable that effect in gp4 tweaker

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