Stories are great for rides like Mystic, Beast, Banshee, Orion, and even Diamondback- and while I’m sure KI could make up one for Racer- I don’t think that a made up story would be the right fit for it.
Actually, I argue that the best way to tell Racer’s story is with its history– how it sparked the second roller coaster renaissance, how The Brady Bunch rode it, how it ran backwards for a while, how it’s as old as the park itself, etc.
Sometimes a ride’s history is its greatest story