The banking angle in a turn on the olympic bobsled track is not constant, but increases upward from the horizontal. coming around a turn, the bobsled team will intentionally "climb the wall," then go lower coming out of the turn. why do they do this?

the curve inclination is increased so that a weight component helps keep the car on track

Explanation:

In the sledging competition these devices go at quite high speeds over 100 km/h, so when reaching the curves the friction force is not enough to keep the car on the track. For this reason,  the curve inclination is increased so that a weight component helps keep the car on track.

In general we can solve Newton's second law for this case, with the condition of no friction, it is found that

   V² = r g tan θ

 Where V is the maximum velocity, r is the radius of the curve a, θ is the angle of the inclination

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