throw out bearing to hold the clutch plates apart, and also adapted to dragbikes that used pneumatics or hydraulics to actuate the clutch release, or centrifugal dragbike clutches known as "slider clutches" that engage with the engine's revolutions per minute (RPM) increase. When using a delay box on a motorcycle with a slider clutch, the engine RPM is electronically controlled (capped) by an electronic rev limiter connected to a delay box. When the delay box times out, the engine is allowed to freely rev-up engaging the clutch and launching the motorcycle downtrack. As you can see, delay boxes can be used on both cars and motorcycles. A transmission brake is not required to use a delay box for drag racing. When racers were educated to this, and also shown ways to utilize delay boxes on motorcycles, there was some alleviation of the early controversy. Delay boxes improve starting line reaction time accuracy for drivers. Delay boxes do not do this autonomously. Driver interaction is still required to launch the vehicle and driver skill is still required to achieve a favorable reaction time. A small number of drag racers took to augmenting delay boxes, or paid technologists for circuitry to do so. These racers concealed customized homemade electronic circuits within the delay box enclosure in a stealthy manner which did violate some drag racing rules. The modifications involved circuitry which enhanced the race car's Elapse Time consistency. Vehicle Elapsed Time is a separate, but equally critical, variable to winning a bracket race. The unethical, hidden home brew circuits performed closed loop control of a drag race car's Elapsed Time ( E.T.). This type of electronic vehicle control was prohibited because it violates rules by automatically performing on-board tasks not triggered by the driver. This circuitry became inserted into a commercial delay box enclosure by the end user as a preferred hiding place. Such home brew circuitry created a "flare up" of the controversy related to electronics in drag racing, additionally, and unfairly tarnishing the delay box. Had these unethical, home brew circuits been hidden elsewhere (or had never been created), the delay box most likely would have been spared regulatory action. Regulation The tampering became so widespread in the 1990s that the National Hot Rod Association (NHRA) required delay box manufacturers to make the delay boxes harder to modify by end users, and shrink enclosures so there was no room for