Can anyone tell me how does a MAP sensor work??
I know it gets the pressure from an intake manifold to adjust the fuel curve,
basically it does whatever the MAF sensor.
But is there anything else I should know about it? Any pros/cons?
Does anyone make one for a Lancer OZ???

 

I'd ask Andrew (hobiekopek) about it cuz he's running MAP on his car. But you're right on how it works and it allows you to remove the MAF entirely. One big pro would be that you can run VTA without having rich conditions that are normally caused when you run VTA with the stock MAS.

As for availability I know the AEM EMS and the Greddy E-Manage both have sensors that you can install to run off a MAP sensor.

 

If you didn't know it stands for Manifold Absolute Pressure. It reads pressure. That's all it does. Just like any other sensor it takes a reading mechanically and turns it into an electrical signal within a certain range to be interepreted by your car's computer. Your car has one with a very narrow band even in its stock form. It doesn't read positive boost pressure and, for tuning purposes, it's effectively useless.

The point of running speed density (MAP) instead of MAF is to allow for unrestricted airflow on the intake side of the motor. The MAF is more restrictive than straight piping. In theory MAP will allow you to use any diameter intake piping.

With the Lancer specifically in mind, the stock ECU is not programmed to run without all its stock sensors. Meaning, you need the MAF in order to function on the stock ECU, therefore making speed density worthless. In order for the car to run on a MAP sensor alone you need to replace the other sensors built into the MAF (The AIT for certain and I believe BPS as well) and have a computer that is capable of interpreting the MAP sensor's signals and applying them to a fuel map. I believe this can be done with an E-manage that has the additional pressure sensor harness and sensor, but I know for certain it can be done on standalone ECU's such as the AEM EMS or Haltech. My own advice is that if you're going to make such a large commitment you might as well go standalone because it's about $500 more, and a complete EMS as opposed to a piigy-back. I'm tired of giving my standalone warning, but I'll say this: Don't do it if you don't know exactly what you're getting yourself into.

Does that answer everything?

 

THX a lot, unfortunately I don't know much about A/F map
So all I can say is MAP is not for me ........
It would be cool to get rid off the MAF

 

Believe me when I say its' not necessary, and, even though I did it, I can't think of anyone with a Lancer who really needs to or would benefit largely from it (myself included).

 

Agreed. There's a million other things you can concern yourself about before removal of the MAS.