What is meant by speed density and MAF or Mass Air Flow?
[back] SPEED DENSITY– Speed density is a control algorithm which “infers” the amount of air flow into an engine. Incorporating a MAP sensor (manifold absolute pressure), and measuring the engine RPM’s (speed) airflow is calculated. Programmed into the ECM (electronic control module) is a volumetric efficiency table for each specific engine application. This table compares the current engine conditions (speed & pressure or vacuum) and outputs a calculated air flow value. This can now be used to insure the proper amount of fuel based upon the air/fuel requirements of the engine. These systems are very cost effective and work well. The downside is that re-calibration can be required with engine modifications. MASS AIR FLOW– This system incorporates a mass air flow sensor in between the air cleaner and the throttle body on the intake manifold. This sensor directly measures the precise amount of air flowing into the engine and sends this information to the ECM for proper fuel metering. Th
