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Overall grip level

Race Driving Fundamentals

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Hello,

May be stupid question about statement "the overall grip level is always reduced compared to what we had under steady state conditions.".

But could you please tell, it's applicable only for cars that have ideal 25%-25%-25%-25% static weight or for all cars?

Because for example if we have car with static 60% rear and 40% front. And this car brakes on the straight line, for example 10% from rear goes to front. And we have instant 50%-50% in this case. But this 10% on rear was in more flatten region of coefficient of friction graph, so total amount of grip should be greater than in steady condition for this car?

The main concept at play here is that for most practical situations, the coefficient of friction of the tyres reduces as we increase the vertical load on a tyre. Without extensive (and expensive) tyre testing, the actual shape (and therefore how much dropoff) in coefficient of friction as we change the vertical load is very different for different tyres. Some tyres have a much greater load sensitivity (more dropoff in coefficient of friction) than others.

Any time you transfer load from one part of the car to the other, you reduce the total amount of grip of the vehicle as a whole. This is the fundamental reason a car with a lower CoG, larger wheelbase or track width are preferable - it reduces the magnitude of the load transfer.

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