MAP sensor/airflow meter?

Honest John Back Room » Technical matters
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Sat 7 Dec 2002 18:32
MAP sensor/airflow meter? - dan
What's the diference?? I think l understand they are mutually exclusive in effect doing the same job but how/why/who am I?
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Sat 7 Dec 2002 18:53
MAP sensor/airflow meter? - jc
Original air flow meter was a flap between the throttle the aircleaner-increases in airflow opened the flap further;then came the hot-wire type-the air flowing over it cools the wire in proportion to the flow.Map sensor-manifold absoute pressure sensor measures the depression in the inlet manifold and with signals from the throttle,engine speed,air temp caculates the amount of fuel needed.
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Sun 8 Dec 2002 13:56
MAP sensor/airflow meter? - dan
So if you have a wire AFM then changing to MAP would be impossible or just prohibitively expensive?
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Sun 8 Dec 2002 19:52
MAP sensor/airflow meter? - jc
Impossible.
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Tue 10 Dec 2002 14:02
MAP sensor/airflow meter? - dan
Nothing's impossible. I expect it involves completely new (third party) engine management system and a modified manifold set up. Expensive...yes, but impossible? - unless l'm missing something.

In case you are sticking by your guns with 'impossible' may l ask if there is any recognised power limitations using hot wire AFM and forced induction. (i.e. Does it start mis-reading and giving poor air/fuel mixtures long before the fuel injectors/fuel pump becomes the limiting factor?)
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Tue 10 Dec 2002 19:16
MAP sensor/airflow meter? - jc
OK-if you want to argue that way it is possible but you are likely to be paying more than the value of the car.Late model Fiestas did change from AFM back to MAP but you would need to change air cleaner,connection between air cleaner and manifold,throttle body,manifold,temperature sensor,MAP sensor,injectors,injector fuel manifold, catalyst,EGO sensor,Ecu and a large amount of the wiring loom-not exactly impossible!!
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Mon 16 Dec 2002 15:43
MAP sensor/airflow meter? - dan
OK, as soon as you mentioned large part of wiring loom... I'll pass. Thanks for your time jc.
Cheers,
dan
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