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