The Rolls-Royce EJ200 jet engine was designed with one purpose, to sit in a Eurofighter Typhoon fighter plane, it was not designed to be used in a jet car. The jet needs to think it is sitting in a Typhoon and recieving the inputs it would expect from the aircraft. These inputs are the sensor values indicatiing of health the various aircraft systems, whether the aircraft is in flight or on the ground and the pilots controls.