NOS WOT Activation Switch & Bracket - 4500

The NOS WOT Activation Switch & Bracket - 4500 by Advanced Engine Design is a precision micro switch assembly engineered for nitrous oxide system activation on fuel-injected and carbureted high-performance engines. Designed specifically for Holley 4500 carburetors, this switch triggers your nitrous system at Wide Open Throttle (WOT), ensuring safe, reliable NOS engagement only when full throttle conditions are met. This component is essential for drag racers, street performance enthusiasts, and serious engine builders who demand accurate nitrous staging without accidental activation.

The WOT micro switch operates on a simple but critical principle: it closes the nitrous solenoid circuit only when the throttle plates reach full open position, preventing premature or partial-throttle activation that could lean out your fuel mixture or cause erratic engine behavior. The included bracket mounts securely to the Holley 4500 carburetor body, positioning the switch directly on the throttle linkage for direct mechanical activation. This design eliminates electronic sensors and their associated wiring complexity, making it a reliable failsafe for naturally aspirated and forced-induction nitrous systems. At just 0.12 lbs, the compact assembly adds virtually no weight while delivering rock-solid dependability in high-vibration, high-heat engine bays.

This NOS WOT Activation Switch & Bracket is ideal for anyone running a Holley 4500 carburetor on a dedicated race car, bracket racing platform, or street machine seeking controlled nitrous deployment. Installation requires basic mechanical knowledge and fits within the Holley 4500's compact footprint (dimensions: 4.65 x 1 x 5.9 inches). The micro switch integrates seamlessly with standalone nitrous controllers, carb-mounted solenoids, and traditional two-stage NOS setups. Whether you're tuning a small-block street engine or maximizing power on a big-inch motor, this WOT switch ensures your nitrous fires only when conditions are ideal, protecting your engine from lean-condition damage and maximizing launch consistency.