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my new maps not calibrating up, in the haltech platinum pro, and a 4 bar haltech sensor, ive moved calibratoins to get in ball park but is nowhere near the instructions...reverted back to onboard and works ....switched over in the settings aswell,and turned onboard off, ill test sensor, was new.
An absolute sensor for manifold pressure is expected to read atmospheric pressure when the engine isn't running. Is there a reason to believe your barometric pressure isn't 14.5 or so if you live near sea level? (or in metric units, about 100 kPa, or 1 bar).
Perhaps the onboard sensor is either calibrated as a boost pressure sensor, so it subtracts the barometric pressure or it's a gauge sensor so relative to atmospheric pressure.
As david said.
In short, there are two types of pressure gauge readings - 1/ absolute, referenced to 100% vacuum, where atmospheric is, as David says, ~14.7 PSIA (where the "A refers to absolute) and 2/ referenced to the ambient air pressure around the gauge, where it gives a figure higher or lower, like the conventional vacuum-pressure gauges found on vehicles. Engine off, this should show 0 PSIG ("G' for gauge).
It's usually easy to tell the difference from the context.
As David also mentioned, altitude and, to a lesser extent, temperature ban affect the display values.
