OK heres a scenario. the 3 cars are all in 3rd doing 40km/hr in the dry and they floor it. The 3 cars dont lose traction.
My assumption will be that the F6 and w427 will not fall behind the GTR. Similar weight, power and torque.
If Im not wrong the old F6 had accleration figures from 80-120km same as the Porsche 911.