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Message: <blockquote data-quote="speed2horizon" data-source="post: 3487042" data-attributes="member: 30831">The internal wastegate consists of an flapper door that allows exhaust gas to bypass the the turbine blade, thus regulating the amount of boost created. An external wastegate is a separate unit from the turbocharger, located on the exhaust header/manifold between the engine and the turbo. Regulating boost is done in a similar bypassing method, but is done before the exhaust gas reaches the turbochargers turbine housing. The size of an internal wastegate is proportionate to the size of the turbo, where as an external wastegate, because it's located outside of the turbo, can be made much larger. An internal wastegate becomes too small when the volume of exhaust gasses coming from the motor exceeds the efficienct flow that the size of an internal wastegate can handle. That's when an external wastegate can be utilized, to vent the extra exhaust gasses to stabilize boost pressure.Here's the link of ZTH members having problematic actuator. Ask tajulsan what's the outcome after shifting to external wastegate.<a href="http://www.zerotohundred.com/newforums/tech-forced-induction/262304-turbo-actuator.html" target="_blank">http://www.zerotohundred.com/newforums/tech-forced-induction/262304-turbo-actuator.html</a></blockquote>

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