In motorsports, everyone talks about getting the greatest amount of aerodynamic downforce on a car in order to get the most speed. However, every derivation I see for a formula regarding the maximum velocity a car can take around a banked turn, with friction, ignoring aero downforce, removes the normal force. This makes me think that aerodynamic downforce isn't important when in a banked turn, but that doesn't make sense to me at all, since it can be important on 0° and 90°+ turns. If I were to consider downforce, would this formula change at all? And if so, what would change?