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im the one who owns/drives the z; i had a lot of friends helping me unload/prepp my car. Even though i remember tightening the lugs with a 4 way...i should of rechecked them after my 1st run because the wheel falling off happened on my 2nd or 3rd run.
i have a craftsmen torque wrench, but forgot it back home...
And there you have that. Whenever I instruct at HPDEs I tell my students that they need to re-torque to 85ftlbs after every lapping session, just for this reason. Stronger, aftermarket studs are also highly recommended.