All ECU’s use various sensors to find out load. Even so the method utilised varies between engines as being the Silvertop works by using a simple Vane kind airflow meter although the Blacktop makes use of a far more intricate vacuum (MAP) and throttle position (TPS) for greater throttle openings https://ricardogjkmk.ivasdesign.com/53140727/the-basic-principles-of-blacktop-20v-4age