How do you make it so a vehicle can go faster than 112 MPH?

So with the INITIALDRIVEMAXFLATVEL it determines the redline speed of the vehicle. But there is a note in there that
says "Setting this value DOES NOT guarantee the vehicle will reach the given speed." Is there a way to work around this because I have a vehicle that's redline won't change when changing this variable and I would like to make it go faster?