DeTomaso Mailing List: May 1997, Message #256
     



From: pantera@pobox.com (David Doddek)

Subject: How a map sensor works.

Date: Thu, 8 May 1997 22:08:26 -0500



Andy wrote:



>Very interesting - TBI for the average joe.  So how does the MAP sensor

>replace a flap or hot wire airflow sensor... heuristics?

>



>-Andy

>



Basically this is the method that many of the 80's EFI cars used.  The map

reads the air pressure in the intake manifold and using the ideal gas law it

calculates the amount of fuel required for the engine at that time.  The

flapper door or air flow sensor measures the air flow directly, but has teh

disadvantage of being more complex and restricts the air flow.  Also costs more.











David Doddek     pantera@pobox.com    www.pobox.com/~pantera    217-422-3722

69 EFI Fairlane, 89 T-bird SC, 74 Twin turbo NOS EFI Pantera

If you are going to go fast, go real fast.