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Dont worry about it too much. Set them at the OEM pressures and then listen to your instructor. As the day progresses you'll be letting air out as the tires heat up and pressure increases. On your first track day you'll be concerned more with learning the line and learning how to brake than extracting much performance out of the car. If the tires are especially stiff or soft your instructor may advise you to adjust the PSI's accordingly if the sidewalls are rolling on you, but overall just set em to OEM and watch/learn how they behave as they get heat into em.
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Well weathered leather, hot metal and oil, the scented country air.
Sunlight on chrome, the blur of the landscape, every nerve aware!
2014 328ix EBII - Sport AT, Light Pkg, Blk Dakota, Moonroof, Navigation, Heated Seats, HK Audio, Driver Assist, Sport Pedals, Dinan Springs, Bilstein B8s, M-Performance BBK
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