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It works like this:
- if you're running on the highway at high speed, essentially just cruising, you need more pressure when you start because it reduces flex in the tires and that actually reduces heat buildup and the associated increase in pressure. The tires run cooler under these conditions.
- if you're on the track, scrubbing when cornering and braking hard builds up heat fast, regardless of the initial tire pressure. You need to lower the starting pressure so the tire doesn't develop so much added pressure it loses grip ("getting greasy" is the term we use).
It's logical - the two situations are different - stiffening up the tire reduces heating on a highway cruise, while lowering the pressure keeps a tire that's destined to get really hot from getting over-pressured.
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