Dear Antwon,
Is it possible you can build a car real quick? I just spoke with the track manager at Kilkare and was informed that, as DK opined, cars and bikes cannot run together. I suggest you get an Antron Brown Top Fuel car, as you would only have to change the "r" to a "w" to have your name on the car.
Let me know.
Sincerely,
Evil