Chip Ganassi Racing typically goes into the Rolex 24 at Daytona every year as the heavy favorite.

Not this weekend.

Ganassi switched to Ford during the offseason, and a variety of issues have raised questions about the competitiveness of their two-car entry.

A rule change ordered by IMSA cost Ford valuable horsepower and drivers have complained they are down as much as 5 mph on the straightaway compared to the Corvettes. They've also said there's a design flaw in their splitter that has created a downforce disadvantage through the road course portion of Daytona International Speedway.

Ford is debuting its new EcoBoost engine package this weekend. There are reliability questions surrounding the 3.5-liter V6 twin-turbo that could also affect 2012 winner Michael Shank Racing.