Rather than go it alone, it seems Radical is trying to attract a major manufacturer that would want to go head-to-head with Audi and newcomer ... plans to step up to LMP1 when the series moves ...

Audi R18 TDI E-Tron Quattro LMP1 Race Car — 215 Mph Now that we have given the Panamera 4S Diesel the title of the fastest-ever production diesel vehicle, it's time to move to race cars.

Since then, all Audi LMP1 race cars have been designated as 'R18' even though they have included ever new model generations. The 2012 R18 e-tron quattro, the brand's first hybrid sports car ...

With several classes of car out on track at once, the fastest are reserved for the LMP1 group of vehicles. This year, Audi, Nissan and Porsche will attempt to follow Toyota’s 2014 championship ...