Delay Boxes

A delay box is an electrical controller that allows a driver to control compatible drag racing components by sending electric power to them (at an exact time pre-determined and programmed), turning them on. These components can include a throttle stop, air shifter, nitrous system, transbrake, and more. This allows precise and consistent reaction times when drag racing.

When installing a delay box (sometimes referred to as a "crossover delay box"), first mount the box where it can be easily reached while the driver is strapped into the seat. Often vibration mounts are included and required to protect the electronics from damage. Once mounted, the box can be wired up. Depending on the brand and model, the wiring connections can change. Most boxes connect to the battery, a fused 12-volt circuit, transbrake, line lock solenoid, throttle control system, air shifter solenoid, wide open throttle switch (for nitrous applications), as well as other components. Once wired up, the box can be tested and then used.

The most common feature on delay boxes is the ability to "bump" up or down the time of launch delay. The delay can be adjusted if the last race resulted in an earlier/later-than-ideal launch to improve the reaction time. This is accomplished with a push of the buttons on the display screen. Another option is "crossover" or "crosstalk". This allows the racers to begin the time delay countdown on either their yellow (start to countdown) bulb or the slower car's yellow bulb. When leaving on the competitor's bulb, their time needs to be entered into the delay box from the competitor dial board as well as the driver's dial display board time. The delay box calculates the difference between the two and the driver activates the delay box on either their yellow bulb or the competitor's yellow bulb to start the countdown to launch. Older delay box technology uses a RPM module kit, which limits the rpm before launch or can begin a timer once engine rpm reaches a predetermined setting. If the delay box will be used to activate more than one device, a multiple relay center will be needed.

A JEGS expert is ready to answer your questions and help you find the time delay box, delay box installation kit, or delay box mount to use for your next race!