I assume you were required to follow all the PCR safety inspections and test your lug nut torque at the autocross, right? If not, your region's AX people are being negligent in the safety department. And so were you. This is nothing personal against them -- I get the impression that laxity in AX safety inspections is pretty common. And then the people running get complacent and ... uh oh.
I keep a Harbor Freight torque wrench and deep socket in my AX box and use it religiously. Cost of the tools was under $20 (on sale) and even if the numbers are 5% inaccurate, it's still a worthwhile investment, IMO. And your experience makes me think I should be checking my lug nuts AFTER running autocross, as well.
But if you DID check the torque at the AX and they still came off, clearly some of those parts you were using should have been sent to the recyclers.
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2009 Carrera S cabrio
ex-2002 Boxster S, Arctic Silver, Aerokit II
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