Are there any tech docs which teach how to setup a car? Like, in what situation or if I want to do this, what should I do such as changing the stiffness of the suspension?

I found the XR GT over steer very much, I just don't know how to correct it in the car settings.

Thanks.

Bob Smith has a massive guide on his website:

http://www.thefloatingwidget.tk/

I found downloading Bob Smith's "Easy Race" setup pack is a good way to learn by comparing them to the race_1 that comes with LFS. The guide as mentioned above is a very useful bit of kit too.

Extra brownie points for both of you.

Thanks.