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Overboost Wastegateopen Exhaust gasdiverted

A small turbine gives excellent response but the back pressure limits the maximum power and also tends to overboost from mid-speed range upwards. To overcome this, when a small turbine is used, it is fitted with a wastegate, which limits boost from the turbocharger by diverting the exhaust gas from the main turbine once the preset boost has been achieved.

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