Subaru's Car Intake System Design
Subaru's Car Intake System Design The following is an opinion on why different year model Subaru's react differently to modifications to their intake system . Primarily we're focusing on the late model Subarus which used either an air-flow system (up to 1999) or the speed-density system (2000+) in the North American market. Before we discuss the technical details of the Subaru Intake System, lets first get familiar with the two ways Subaru has used recently to measure air flow. The first method discussed is MAF Sensors which were used on all late models until the 2000 model year. From 2000-on Subaru has begun using a speed-density system which primarily relies on a MAP sensor. MAF Sensors Mass Air Flow (MAF) Sensor is used by the engine control unit (ECU) to determine the weight of the air going into the engine. To do this, Subaru uses a cylinder shaped sensor mounted securely to the stock air cleaner box behind the passenger side headlight assem