--You need to wait till the race starts and then u can go in the race and you just get money--
local args = {
    [1] = {
        ["data"] = {
            ["lastrwdId"] = 4
        },
        ["protoId"] = 20504
    }
}

game:GetService("ReplicatedStorage"):WaitForChild("RemoteEvent"):WaitForChild("Main"):FireServer(unpack(args))