Haltech E6M - Manual (Page 66)

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that the environment always operates at 1000mBars barometric pressure. It will then look at
the Barometric Correction Map (located in the Maps pull down menu) and locate the
1000mBars section of the correction map. Whatever the height of the bar corresponding to
1000mBars will be taken as the overall enrichment %.
For example, 1000mBars might correspond to the following highlighted bar on the
Barometric Correction Map:
This bar has a height of –25.9%, so the E6H/E6M will provide an enrichment of –25.9%.
Changing the pressure value associated with Barometric Pressure Lock will obviously move
the corresponding bar on the Barometric Compensation Map. Once the bar is highlighted you
can elect to use the height of the bar as it already is or you can change the height of the bar by
using the up and down arrow keys, exactly the same as you would when tuning the
fuel/ignition maps. This will of course change the enrichment % used by the E6H/E6M.
Note: The bar height should only be adjusted if your environment requires it.
Reducing the fuel enrichment may cause your engine to run lean and damage
will occur. Only adjust the height of the bar if you are confident in what you
are doing and have sufficient knowledge about your engine and the
environment in which it is operated.
Method 2
Method 2 is similar to Method 1 as it uses a constant value as the barometric pressure but has
two distinct differences:
- Method 2 is restricted to engines using MAP load sensing.
- Method 1 requires a Barometric lock value that the E6H/E6M will use in
place of a barometric pressure reading. Method 2 requires you to open the
throttle butterfly and force the manifold to the current atmospheric
pressure. This pressure is measured by the MAP sensor and used by the
E6H/E6M for barometric compensation until the engine is switched off and
the process is repeated.