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I've had similar power reduction issues on-track and have taken actions to reduce reoccurrence. Sport ER oil cooler with right fog light delete, removed cabin filter shelf-use BMS cowl filters, and removed trans splash panel. Given the disadvantage of using a 6AT on-track with the stock heat exchanger I avoid track days when forecast temperatures exceed 90 degrees F. Temps were cooler (low 80s) at Buttonwillow nine days ago, but may have experienced the brake temperature issue. Using PFC08 pads and a brake cooling mod.
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 2008 E91, ARC-8, 255/40/17 NT01, ER sport cooler, TCK camber plates, coil-overs 400# front 700# rear, Koni SA shocks. M3 Subframe bushings, front + rear control arms, tension struts, strut brace. Quaife, Carbotech, Schroth. |