2016 Le Mans: What is Balance of Performance and why did it matter so much this year?

Of the many things that I have seen in a motorsport weekend, I have never once been witness to tears even before a race has begun. Much less during a pre-race press conference. Which is why it was with some amount of shock that a room full of media people looked on silently, as Dr Frank-Steffen Walliser choked up during the pre-race press conference on the Friday before the 2016 24 Hours of Le Mans. Dr Walliser, the Head of Porsche Motorsport, was on stage speaking about what the Porsche team could expect from…