Roger Penske has put time, money and passion into making the Detroit Grand Prix a world-class event.

Auto racing's return to the Motor City last year after a four-year absence didn't go well.

Scott Dixon won the event marred by poor track conditions that stopped the race for a little more than 2 hours and shortened the 90-lap race to 70. Chunks of asphalt and concrete were missing, creating pot holes and grooves that spoiled the show.

Penske's Michigan-based company and Chevrolet invested nearly $2 million into the track that has been reconfigured to make it wider in spots and faster on a straightaway.

The improvements will be put to a test because IndyCar has scheduled two, full-length races for the first time this weekend on Belle Isle.