k guys play nicely now lets get back to the point? It was asked why his car didnt want to go after fitting the filter, like i said try cleaning the air flow sensor but be very very carefull its very fragile try it and see, the noise you hear can be anything so unless you describe it to us we cant help but my money is on the waste gate opening
The MASS AIR FLOW does compensate for heat. It measures the density of the which is dependant on the heat and altitude. You know how the MAF works so I wont explain.
Really? So let me get this straight at a given throttle position boost and rpm the air density falls off because its now at 100deg C.
The maf registers less airflow. How on earth does the ecu KNOW that this is due to heat and not due to a change in some other condition like lets say a blocked airfilter or maybe a change of altitude or even an increase in ambient temperature.
Why on earth does every other manufacturer insist on wasting money by fitting a Air temp sensor when the maf is capable of doing all this work.
The maf registers less airflow. How on earth does the ecu KNOW that this is due to heat and not due to a change in some other condition like lets say a blocked airfilter or maybe a change of altitude or even an increase in ambient temperature.
Yes it does measure less airflow and therefore less fuel is injected. It is regardless why the is less airflow the ECU will compensate the fueling accordingly.
Why on earth does every other manufacturer insist on wasting money by fitting a Air temp sensor when the maf is capable of doing all this work.
The problem with a MAF is that is restrictive, it is a slight venturi which restricts the air.
The MAF meter has a "HOT WIRE" it measure the resistance in this wire from which it calculates the MASS of air flowing. The more air particals hitting this wire the cooler it get and therefore the lower the restance. The less air particals hitting the wire the greater the resistance.
An AIR FLOW meter is better because less restriction but it cannot measure the mass of air, thats why cars with mass meters have air temp sensor aswell.
You cannot determine the amount of air particles by just measuring air flow.
The problem with a MAF is that is restrictive, it is a slight venturi which restricts the air.
An AIR FLOW meter is better because less restriction but it cannot measure the mass of air, thats why cars with mass meters have air temp sensor aswell.
gary - those two statements seem to be contradictory. MAF is an acronym for Mass Air Flow. so in the first statement you say its restrictive, and in the second you say its not!
You cannot determine the amount of air particles by just measuring air flow.[/quote]
i thought the hot-wire was just nissan's way of measuring the volume of air passing through the sensor. i know our rotary motor has a different design of MAF sensor, it has a long plastic pipe, with a bullet shaped internal piece that is spring-loaded and attached to a variable resistor. the more air flows through it, the further back the bullet shaped piece is pushed, and this is how it measures airflow.
but there is also a MAP - mass air pressure sensor - that the computer uses as well.
gary - those two statements seem to be contradictory. MAF is an acronym for Mass Air Flow. so in the first statement you say its restrictive, and in the second you say its not!
Sorry my wording is a bit messed up. An air flow meter (like the Opel boss uses) measures the speed of the air, hence AIR FLOW METER, and a air temp sensor top correct it. The 200sx uses a MAF meter, measures the density of the air.
lets get back to the point? It was asked why his car didnt want to go after fitting the filter, like i said try cleaning the air flow sensor but be very very carefull its very fragile 
