Start with factory settings for the OE tires. Adjust down/up depending on shoulder scuffing, heat across the tire after a run. Er...you do have a tire pyrometer don't you? Available IR thermometer at Harbor Freight Tools for $25:Whats a good pressure for Hoosier A-6's, tracking with NASA at Sebring this Sunday need some advice. Was using the A048 at 25psi cold.