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back pressure maybe? :confused:

Barometric Pressure

The weight of the air that makes up our atmosphere exerts a pressure on the surface of the earth. This pressure is known as atmospheric pressure. Generally, the more air above an area, the higher the atmospheric pressure. This, in turn, means that atmospheric pressure changes with altitude. For example, atmospheric pressure is greater at sea-level than on a mountaintop. To compensate for this difference in pressure at different elevations, and to facilitate comparison between locations with different altitudes, meteorologists adjust atmospheric pressure so that it reflects what the pressure would be if measured at sea-level. This adjusted pressure is known as barometric pressure.

Barometric pressure changes with local weather conditions, making barometric pressure an important and useful weather forecasting tool. High pressure zones are generally associated with fair weather, while low pressure zones are generally associated with poor weather. For forecasting purposes, the absolute barometric pressure value is generally less important than the change in barometric pressure. In general, rising pressure indicates improving weather conditions, while falling pressure indicates deteriorating weather conditions.

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So...what would the wrong setting do to a dyno reading?
Give an incorrect power figure

Give an incorrect power figure

And that would be what...a much higher figure?

When I first got my Xede, Chip Torque inadvertantly mixed up the inputs and the Barometric pressure was read incorrectly. It seriously affected the whole advance/timing and the car ran like a dog eventually going into limp mode.

So Barometric pressure does have an important part to play in power and tuning measurement but I couldn't tell you how it would skew your results.

Blackstar,

Barometric pressure is also known as atmospheric pressure.

The standard atmospheric pressure at sea level is 1013.25 millibar (mBar), or 101.325 kilopascal (kPa)

On my dyno read outs (see 380 dyno thread) there is a line which reads:

Correction: 2.85 SAE J607 (24.1 degreesC, 1012mBar, 32%)

So during my dyno runs the atmospheric pressure was 1012mBar, or very slightly lower than 'standard'.

It seems likely that your dyno readout is in kPa instead of the more common mBar.

KJ.