If you are running the APR GTC500 wing be very careful with your speeds. I installed mine as instructed to the rear hatch cover when I received it last month. It seemed a little unusual to attach it there but we followed the instructions. We ran Roebling Road this past weekend and the car performed incredibly well. I was able to run by far the best lap times I ever have(1:16.43). Part of that was due to the added down force the wing created. It really helped with the sweeping high speed turns and the long straight. The car was steady as a rock with the wing. We ran all day Saturday and two sessions into Sunday. Needless to say these cars road race performance greatly improves with the wing.
However, at the end of the long straight at about 158mph when you brake hard going into turn one the wing somehow ripped off the rear hatch panel and left the car. I'm not sure what caused this but the transition from WOT to very hard braking created enough upward force to tear it off. It was adjusted fairly aggressive with the down force so I know that part was working exceptionally well. Why the change to braking effected it that much is a mystery to me. Fortunately for all involved when the wing left the car it headed into the grassy area next to the course and avoided the potential track damage. The hatch cover is a loss but I think the wing can be repaired. Anyway, I am hoping that APR will help help with the repairs.
I'll keep you updated as we move forward. We will be looking for a new mounting point(frame rail) and mounting brackets.