How do you drag race in forza 4 split screen in a straight track en?

To drag race in Forza Motorsport 4 in split-screen mode, first, select "Split Screen" from the main menu and choose your cars. Then, pick a suitable straight track, like the "Maple Valley" drag strip. Once in the race setup, select a drag race event, and both players can line up at the starting line. When the race begins, accelerate at the optimal time to achieve the best launch and maintain control to win the race.