2 Bar MAP Calibration - Hemi Truck Club
 
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Old 11-30-2007, 12:09 PM   #1
 
Join Date: Sep 2007
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2 Bar MAP Calibration

Does anyone have the calibration that will allow me to convert volts to pressure on the 2 Bar MAP sensor that comes with the SMT6/Injectors kit? I am trying to verify my autometer boost gauge reading. But my SMT6 only sends MAP volts to the laptop.

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Old 11-30-2007, 01:36 PM   #2
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2 Bar MAP Calibration

Generally,

The sensor has a 5v supply, so;

It will send a signal from just over zero to just under 5v to the pcm from full idle vac (-20) to 14.7lbs of boost, but it'll be half of what a 1bar (stock sensor) sends at the same -20 to zero vac that the 1bar sends.

So;

Check your voltage on the stock sensor at key on/engine off. That is zero vac/boost.

Then check your stock sensor voltage at idle. It will pull around 20" of vac.

At key on/engine off, your 2bar should send the same voltage as your stock one did. Then with the engine idling, it should be the same voltage as your stock one was, etc.

But, since you have larger injectors, those voltages have to be modified to pull some fuel so that the engine will not flood.
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