mass air pressure? nisem ziher... edino pressure mi pade na pamet

Nope, pubeci... To ti je manifold absolute pressure.

in kje se nahaja MAP? MAF se nahaja pred TB, ne?

japan power je napisal/-a:in kje se nahaja MAP? MAF se nahaja pred TB, ne?

Manifold je sesalni trakt....

japan power je napisal/-a:in kje se nahaja MAP? MAF se nahaja pred TB, ne?

Običajno je s cevko povezan s sesalnim kolektorjem in je nekje v bližini.

hm.. na Subarujih maš tule dovolj obširen članek o MAF vs. MAP:
http://www.cobbtuning.com/tech/airflow/index.html

na kratko:
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 assembly. Inside the sensor there is a special wire or film which is kept heated to a certain temperature. As air passes through the sensor, this wire or film is cooled and the sensor determines how much electricity is required to keep the wire up to temperature. This enables the sensor to determine how much air (in weight) is passing through the sensor at any given moment. This signal is then sent to the ECU which it compares to a preprogrammed map to deliver fuel and ignition spark, taking into account other engine inputs such as engine RPM and temperature.

Pros:
* Highly accurate A/F Ratios for a wide variety of driving conditions

Cons:
* Present a restriction in air flow
* Fragile


MAP Sensors Speed-Density systems (used on the 2000+ models) calculate the weight of air going into the engine by using a Manifold Absolute Pressure (MAP) sensor, the Intake Air Temperature (IAT) sensor and the Perfect Gas Law. To accurately determine the correct weight of fuel needed, the ECU has a Volumetric Efficiency map stored in it which it uses to calculate how much fuel must be added for a proper Air/Fuel mixture.
#

Pros:
# Easy and inexpensive to implement
# Very durable

Cons:
# Does not compensate very well for changes in VE
# Not very accurate A/F Ratios under transient driving conditions (ie: non-WOT street driving)

hvala za obrazložitev!