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Waste Gate Solenoid Boost Control Details

Normally the stock ECU system can control the WG solenoid can add pressure to increase the boost above the spring pressure by approximately 0.1-0.4 bar. It is limited to how fast it can raise the boost and normally for best performance, you want to use the stiffest WG spring possible which is about 0.1-0.2 bar below the boost map values set in the ECU. People living at high altitudes may want to limit the boost map values set in the ECU EPROM code to 1.8 bar and use the stock or 1.8 bar spring to prevent over-spinning the turbo at high altitudes.

This same WG solenoid setup can subtract about 0.1 bar from the boost supplied by the WG spring pressure at sea level. You will lose more boost at higher altitudes if the ECU controlled WG solenoid isn’t working. The WG solenoid does this by connecting the upper WG chamber to the inlet side of the turbo which is at a slight vacuum under WOT conditions.

To fine tune the WG spring tension and the over-boost response, I normally modify the waste gate upper cap to allow the WG spring tension to be adjustable. On the 5000/200TQ, the spring perch can be removed from the cap after the allen bolt is removed.

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