Previously, ACO set brake zones. In Le Mans case, it's seven, so 500kJ*7=3.5MJ, but in most sprint races there are 4 zones, so the total energy is 2MJ instead of 3.5, similar power but surely less boost time. In the F1 scenario, it's 400kJ a lap before 2014, so less than what LMP can harvest in a corner.
Forgot about the new regs though, but I'm sure 8MJ energy and boost time is still restricted to Le Sarthe.
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