Adjustable MAP sensor

[Bounty__Hunter]

Who's done it and how do you like it?

I'll soon be installing my Mopar Performance camshaft and I'm thinking I'll have to do this mod to get more fuel, to take full advantage of the new cam and my other performance mods.

After reading the writeups on this, I'm not sure I understand how voltage still varies according to manifold vacuum. Seems to me that the voltage stays at what you dial it in at, across the RPM range and regardless of throttle position. But I don't think it would run well if that were the case.

www.rightcoastcrawler.com/billaVista/MAP/ADJUSTABLEMAPSENSOR.HTM
www.angelfire.com/my/fan/MAP_adjuster.html
www.jeepbarracks.com/modules.php?name=News&file=article&sid=18

 

[jps4jeep]

B_H, I have never done this mod, but I was thinking of doing it a while back, I researched it and it seams that if you do perform it, you are limited to the other types of engine modifications dealing with the computer.

I think it was on 4x4wire that I saw this info, but can't really recall.

How about a ignition modual?
msd or accel?

 

[XJNick]

Hi,

A MAP sensor is basically a potentiometer, like a variable resistor. The computer is giving it a constant +5 volts and it is returning a varied voltage between ~ 0 to ~ +4.5 volts.

Now for my guess (nah... let's say theory) as i've never dealt with an adjustable MAP sensor before:

So if you want to adjust the MAP sensor's value to the computer while still allowing it to fluctuate with respect to manifold vacuum, you'd simply insert another potentiometer or variable resistor in SERIES with the MAP sensor's potentiometer. This effectively allows the MAP sensor to report data as usual, while allowing you to Skew it's output higher or lower depending on the position of the second (added) potentiometer. Make sense? :mrgreen:

-Nick :!: