Nice work in your car! I had one of the first 135i to land in the States and could never make it reliable on the track. Even after adding additional coolers, better brakes (mine crushed the stock Brembo pistons at 145mph going into the Bus Stop at Watkins Glen), I would constantly go into limp mode almost every session when driving above 8/10.
Glad yours seems to be working out for you! Nice footwork! At least the McLaren can say that nobody was able to pass him.