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hey everyone i hooked the scanner from work up to my truck last night to watch rail pressure and boost because the sensor for my boost guage is messed up. the factory guage is reading 13 psi of boost at idle, and 40 psi at wide open throttle. my question is why is this not throwing an over boost code?
 

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Bac To The Future
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IIRC, the MAP will also read atmosphere pressure as boost. I believe its 14.7 at sealevel? I believe you subtract the 13 from the 40 to get actual.
Someone will correct me if Im wrong.
 

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IIRC, the MAP will also read atmosphere pressure as boost. I believe its 14.7 at sealevel? I believe you subtract the 13 from the 40 to get actual.
Someone will correct me if Im wrong.
x2, it's 14.7.

Keep in mind, these trucks have both a boost pressure sensor and a barometric pressure sensor.
 
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