Whether you have an experimental or certified aircraft the system is basically the same. One magneto is replaced with a Magneto Timing Head (MTH) which provides crankshaft position and RPM information. In some applications, the RPM and crankshaft position information will be supplied by a Crankshaft Trigger Wheel (CTW) in which case the removed magneto will be replaced with a cover plate. The controller, the brains of the system, is installed on the cool side of the firewall and receives this information. The controller in turn uses this information to instruct the inductive coil (typically mounted on the firewall) to fire the appropriate spark plug. The controller gives this order twice per cycle, initially on the compression stroke and then again on the exhaust or waste stroke. This is known as a waste spark system and serves to burn any residual fuel thus completely cleaning out the cylinder and reducing deposits. Once the aircraft is at altitude, and operating below 24″ of manifold pressure, the Manifold Absolute Pressure Sensor (MAP) lets the controller know it’s time to start advancing the timing. This allows the engine to perform more efficiently, with less fuel, while also producing more power. This is a true, high-energy, tuned electronic ignition system and it is now FAA/PMA approved for over 500 certified aircraft, as well as the most extensive experimental installations on the market today.