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Almost all latest turbo diesel have the turbine with variable geometry. What we see, nearest to the turbine, could seem to be a Waste Gate, but in realty is the pneumatic actuator, that makes the variable geometry works. In most cases it’s enough reprogram the eprom and the turbine’s pressure boosts by itself. It would be sensible to change it if the intercooler was changed too, because when the Waste Gate restores itself it makes the turbine’s pressure increase; when this happens the air’s temperatures increases and as consequence the present oxygen’s quantity decreases. The combustion happens in presence of fuel and supporter of combustion, as fuel we have the gas oil and as supporter of combustion not the air but the oxygen. Substituting the Waste Gate means obtain much more pressure. For having some more pressure, without have this kind of problems explained above, it is enough the original Waste Gate.
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