I thought the z2's turned in alot sharper. I'm use to rs3s on my car and kept hitting cones on the t&t course in Dave's car. I noticed I had to use a lot less steering input to get the car to turn and I could do so later than the rs3's.

 

I have seen a post from Kraig where he said that a change in his line was responsible for the big improvement in time on Sunday. He says some other stuff but I haven't had my coffee and can't recall it right now.