The rulebook specifically forbids the teams from using depleted uranium for ballast. I think most of the teams use tungsten, it's more dense than lead. http://

The rulebook specifically forbids the teams from using depleted uranium for ballast. I think most of the teams use tungsten, it's more dense than lead. http://www.wolframalpha.com/input/?i=tungsten+density+vs+lead+density http://www.wolframalpha.com/input/?i=tungsten+density+vs+lea... A carbon fiber transmission, properly constructed would allow for tighter aerodynamic packaging. Adrian Newey (the current Red Bull designer) is famous for making cars fragile and very aerodynamic. Sometimes his tight packaging causes his cars to overheat.