What is the control rating for a driver that races the engine unnecessarily?

The control rating for a driver that races the engine unnecessarily is categorized as "Bad." This rating is indicative of poor vehicle control and irresponsible driving behavior. Racing the engine typically suggests that the driver is not operating the vehicle within safe limits, which can lead to loss of control and potentially hazardous situations.

In this context, a "Bad" control rating reflects a lack of discipline in managing the vehicle's power and performance, which is essential for safe driving. Responsible driving entails using the vehicle's engine and speed appropriately, without unnecessary revving or aggressive acceleration that can compromise safety. Therefore, such behavior clearly warrants a negative assessment in terms of control rating.