How can I edit the Chaos Vehicle pawn to be really fast?

So I´m trying to prototype an arcade style game, but I feel very constrained with the default setup on the chaos vehicles. Iv’e moved some parameterslike throtling and max RPM with torque, but I still get stuck with the gears and haven´t been able to reach at least 500 km/h. Anyone could direct me on how to properly change values without braking the car? Thanks in advance.