First of all you can place another "governor" with a increased bandwidth. Next to this you need some controls to optimize the filling grade of the combustion chamber. This means the magine has to be dynamic valves. The higher the RPM's the sooner the exhaust valves have to open to release as much as possible combusted gases. Or in case of injectors, the injector dimensions (specs) have to be adapted to a increased revolution. And of course the injector pump becomes an issue as well.