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For the RE71-Rs the best tire pressure is just over 30 PSI front and back. Fine tune it by chalking your tires. Check the pressure after each run to compensate for heating.
I have not run Toyo R888Rs on track, but have tracked RE71-Rs and found that they overheated. Suggest you start with a fairly high pressure, like 34 PSI front and back and measure tire temperature with a tire pyrometer after the tires have warmed up. For the Toyos they publish a recommended temperature range. If the tire gets too hot raise the pressure, if too cool, lower it.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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