Which risk increases when a turbocharged engine operates at high altitude with fixed wastegate settings?

💡 Explanation

At high altitude, the thinner air necessitates the turbocharger to spin faster to achieve targeted boost pressure; with a fixed wastegate, excessive exhaust gas drives the turbine even harder creating too much boost, which leads to cylinder knocking. Therefore excessive knocking results, rather than surge, pre-ignition or leakage requiring different component failures.

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