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Horsepower and downforce issues plaguing Ganassi teams at 24 Hours of Daytona

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    Drivers Scott Dixon, left of New Zealand, and Scott Pruett pose for photographers after a practice session for the IMSA Series Rolex 24 hour auto race at Daytona International Speedway in Daytona Beach, Fla., Friday, Jan. 24, 2014.(AP Photo/John Raoux)The Associated Press

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    AJ Allmendinger talks with other drivers after a practice session for the IMSA Series Rolex 24 hour auto race at Daytona International Speedway in Daytona Beach, Fla., Friday, Jan. 24, 2014.(AP Photo/John Raoux)The Associated Press

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.