Electronic Fuel Injections - Hot Wire Sensors

The Lancer Evolution features a hot-wire Mass Air Flow (MAF) sensor. It is positioned in the intake tract between the air filter element and the flex-tube leading to the throttle-body.
The Lancer Evolution features a hot-wire Mass Air Flow (MAF) sensor. It is positioned in t
Some hot-wire MAFs incorporate screens to better meter the incoming air. As power (read airflow) increases, these screens can become restrictive. In some applications, one or more of these screens can be removed for added performance, but on occasion metering problems can surface so tread carefully.
Some hot-wire MAFs incorporate screens to better meter the incoming air. As power (read ai
The wire elements of MAF sensors differ greatly from one make and model to another. Some are fully exposed while others are surrounded by a matrix that 'tunes' the airflow to optimize the sensor's accuracy.
The wire elements of MAF sensors differ greatly from one make and model to another. Some a

This vane style MAF is off a 1980's vintage Toyota. The curved portion on the right of the unit houses the vane or flapper door. The black plastic part on top with the plug receptacle houses the metering apparatus.
This vane style MAF is off a 1980's vintage Toyota. The curved portion on the right of the
Aftermarket hot-wire MAFs usually increase the internal diameter of the unit to increase flow and are key to engines going from naturally-aspirated to forced induction. The increased flow of the MAF will necessitate ECU tuning to function properly.
Aftermarket hot-wire MAFs usually increase the internal diameter of the unit to increase f
Manifold Absolute Pressure (MAP) sensors are used on speed density applications. This Denso unit from a 1995 Honda delSol with a D16 engine is mounted on the throttle-body.
Manifold Absolute Pressure (MAP) sensors are used on speed density applications. This Dens