Here I will show you
http://www.40roll.com/myg35x/G35x%20dyno%20(Medium).jpg
See the up and down, If you compare wheel speed 1 to wheel speed 2 you see they are an inverse of each other, We see this on all 3 G35x's we have dynoed.
http://en.wikipedia.org/wiki/ATTESA
^ Thats why it happens and my theory is that on a linked dyno it will be smoother. The G handles like a RWD most of the time because the system's designed that way. It gives the car a really nice feel around the track.