Dale Earnhardt Jr. says he expects to be frustrated with the car of tomorrow at Darlington this weekend. NASCAR Nextel Cup Series Director John Darby says that's how it's supposed to be. He has heard drivers talk about the cars being more difficult to turn since the start of testing with the new car. But drivers will learn. Darby said he is not concerned about the dominance of Hendrick Motorsports (four wins) and Chevrolet.