While chasing what possibly could make my car jump around on ruts, bumps and potholes like mad, I posted my questions in different forums, especially the german Seven-IG and the english WSCC-technical board. As always, the first answers get you more confused and you just feel dumb confronted with all that expertise. Then you start to read, ask more questions to those guys running theirs cars both on the road and the track.
The phenomenon is not easily explained, but I'll try. Imagine there is something wrong with your car's steering and/or suspension set-up. You drive around and you hit a pothole and the bumpsteer makes, like it says, that the car is steered in a different direction than your steering wheel points. As the affected wheel moves up and down, the wheel carrier moves in and out and steers the wheel. This is mostly due to a bad alignment of steering rack and wishbones.
Of course all this is far more complex and you could read your day (or week) away with expert literature. Two documents may catch your interest:
Doc 1
Doc 2
If you want more try the www or your nearest book shop.
Cheers.
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