[masraum]

I think the biggest factor is the light weight of the front end. If you don't understand why, imagine holding a hammer by the end of the handle and then try to swing the heavy end back and forth quickly. Because of the weight of the head of the hammer, you can't get the end to change direction very quickly. Now hold the hammer by the head/heavy end and then try shaking the other end back and forth quickly. Because you are holding the heavy end, you can get the other end to change direction very quickly.

Besides that, you have the fairly quick ratio rack and pinion. The quick ratio makes another quick difference. That's why a seemingly small adjustment on the steering wheel can make a fairly large difference. Most cars have much slower ratios.