60' time was good, but there were several better in 2014 regular season.
With all the bull shit on the car these days, it's not like you can go take 100 pounds off the car and run light. Even if you could, you don't learn anything doing it.
Nowadays, testing is all about gathering data, and seeing if changes made work, or don't. If they work, great, then you can put a number on the board to boost your ego a little bit. I would! Teams are not going to go all the way to PBIR in Decmeber just to run non-legal, and not learn anything to apply towards the start of the 15 season.