Method for operating an engine to adjust turbocharger performance characteristics

A method to operate an electronically controlled internal combustion engine having an electronic control unit (ECU) with memory, a turbocharger with actively controllable boost output, and exhaust gas recirculation valve (EGR) to determine performance characteristics of said turbocharger, said turbocharger equipped with at least one of a wastegate and a variable geometry, comprising:

• determining whether the engine is operating at predetermined temperature and first predetermined engine speed (rpm) for a predetermined period of time;
• operating said engine at a second predetermined rpm;
• increasing engine load;
• closing said EGR value and comparing said turbocharger vane output position to a predetermined percentage of maximum vane output;
• determining ambient barometric pressure;
• determining intake manifold pressure;
• determining ratio of intake manifold pressure to ambient barometric pressure;
• determining whether said ratio of intake manifold pressure to ambient barometric pressure equals a predetermined pressure value;
• wherein said boost is controlled by vane position, said vane position adjusted to a predetermined vane position value in memory when the ratio of intake manifold pressure to ambient barometric pressure does not equal a predetermined pressure value when said turbocharger is equipped with said variable geometry.