Quote:
Originally Posted by Pt_killa
Could it be that the amount of boost control from the tru-boost is slightly different between an internal gate and a dual port external wastegate? For an internal setup the controller just limits the air to the actuator to allow boost to rise while for an external setup the controller applies an offsetting amount of air to the top of the wastegate to control the boost, therefore the delta of the duty cycle and boost may be different for the two. Also, there is no extra pressure on the diaphragm while controlling boost on an internal gate but there is extra diaphragm stress on an external gate so maybe its a durability/safety thing?
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Makes sense to me, I have no experience with external wastegates. This is the first turbo car I have owned so I've been learning as I go. I hope there is a difference though and the internal setup can reach more than double the springs because I will want to run more than 14psi. We shall see