I was talking to my Ford training instructor yesterday about the despised MAP system on most of our trucks. For some credentials the man has been a Ford tech instructor for some 30 years, a dealer tech for 10, and a shop foreman. He and the other Ford instructor built the engine that currently holds the flathead land speed record. So the guy knows his stuff, and happens to be a big F150 / Bronco guy. Anyway, according to him, because the Manifold Absolute Pressure system reads manifold vacuum ,cold air kits, bigger valves, heads, and even cams and forced air will still be beneficial to the system. It will still read correctly untill you defeat engine vacuum. So if you run an extreem cam and loose vacuum or a turbo or supercharger that creates positive pressure then you go beyond perameters of the sensor. However this can be solved by changing the sensor to one designed for the new pressure readings. Because the ecu is only looking for a value from the sensor ( in Hz ) as long as that number is sent it doesn't care what the actual pressure is. Valves and heads don't effect the vacuum. When the throttle is closed, you get vacuum based on base engine. When open it drops till limited by intake. Unless air is forced in you can't reach zero vacuum and are not likely to go beyond the range of the sensor. So while the MAF is a superior system you can still take advantage of the power adders with your old MAP.

 

That is interesting. I wonder if the Lightning sensor is any different than the plain-Jane 5.8....

 

Good question........doing a parts number search now........

Let's see.......

 

From what I see on BWD and Wells, it's the same sensor on the 4.9, 5.0 and 5.8.

 

Yea a map conversion is a common swap when putting turbo's on maf controlled cars most imports that have turbo's installed swap to a map for an easier tuning system to work with really all you have to change at most is a stand alone efi setup when boosting a map system

 

Really? All you have to change is everything? Duh.

 

Well the few I've seen like that have been 700+hp 4 bangers so it was kinda nessicary but no not everything has to be changed most times its just a conversion from maf to map

 

My thoughts exactly. But assuming the one you need exists, all you need to change is the actual sensor.

 

I saw this piece on tricking the, map sensor with resistors, http://www.fuelsaver-mpg.com/simple-map-maf-enhancer

 

Haven't looked at your link yet but yeah that's all it would take. Just need to do a little math.