this via google.
As for the way that the rumble strips affect the steering, I was kart racing
this weekend and I found that running over a kurb doesn't cause the wheel to
pull in any direction.
I found that the kerbs caused vibration, because of the rodges, and could
flick that side of the kart up, but there was definately no push or pull on
the steering wheel other than that.
So, I'm going to set the "FFB rumble strip pull factor" to 0. I just need to
work out whether that's +0, or -0 :-D
R.