Calibration for vacuum pressure measurement

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Release lock nut on controller (1).

Press setting with measurement.

Determine ambient pressure
Seal stop cock (2) in direction of arrow
Set controller (1) to 200 ± 10 mbar below ambient pressure (e.g. 980 - 200 = 780 mbar).

Open stop cock (2) again.

Wastegate valve closes.

Fig 1: Identifying Controller And Stop Cock

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Initial position (1) of wastegate linkage with preset vacuum pressure.

Wastegate valve virtually closed.

Fig 2: Identifying Position Of Wastegate Linkage With Preset Vacuum Pressure

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Checking turnability at wastegate valve.

Wastegate valve can be turned with minimal force.
Adjustment at wastegate valve is OK.
Wastegate valve has play and can be turned without resistance, wastegate valve open too far.
Carry out adjustment at wastegate valve, shorten linkage.
Wastegate valve cannot be turned, wastegate valve closed.

Carry out adjustment at wastegate valve, lengthen linkage.

Fig 3: Checking Turnability At Wastegate Valve

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