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Why only 12.5psi? I would have expected you could run 14-15psi pretty easily without race fuel. Certainly you could see a 30-40kW benefit with adding race fuel and another 3.5psi. I am just surprised you are running such low boost currently, and that explains your trap speed loss. I will generally run 15-16psi on 98 RON with down pipes.
Nice job on the the 60 foot with road tyres. I need AWD to better that (but not by much) in my WRX with road tyres. Best I have done in a BMW manual is a 1.9-2.0 and I thought that was pretty good. I saw a WRX run recently with drag tyres for a 1.39... Wow!!
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