I am using the tyre friction equation Fc=mu*Fnormal to calculate the downforce required for each corner of the Gilles Villeneuve circuit in Canada. Fnormal composes of the downforce and weight of the car. mu has a maximum value of 1.7, however this value will vary from corner to corner right? this is resulting in negative values for downforce in some corners. Does anyone know a way of calculating the tyre friction coefficient for each corner without needing the Fnormal force? All of my calculations are on the attached excel spreadsheet.