Thread: Finding maximum velocity?

An 830 kg race car turns in a circular path @ 58m/s with out slipping. The radius is 160m. Air flowing over the cars wing exerts a downward force of 11000N on the car.

I have to find the u(coefficent of friction) between the tires and track.
I got u=0.91. Does that make sense?

Now if there is no wing force(no downward force of 11000N) what is the cars maximum velocity before it slides.
I am not sure where to look at for this, can someone help me out please.
Do I use a kinematic formula on this?
THanks

Do you know that the circular path is the smallest possible radius such that the race car doesn't slip? Otherwise, I don't know that you could find out the coefficient of friction.