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With a stock car on stock wheels and tires at stock curb weight, door sticker pressures usually work great.
Change the wheels and tires, reduce weight by several hundred lbs and everything changes. For wider racing tires I often run 5psi lower than sticker recommendations cold. The only way to really dial this in is with testing and an IR gun to check temps. Run several laps and check inner, center, and outer tread for temps. Wherever you find higher temps you will also tend to find higher wear.
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2021 Cayman GTS 4.0L
2020 Macan (dog hauler)
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