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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 997195, member: 8143"] I agree for the most part. But, if you have to use boost to help open it then you have way too much spring. And using boost on the bottom port it changes the way it opens during different/partial load scenarios. The only way to tune a dual reference is at wot and it seems to be jumpy during normal driving. Really everyone makes these way too complicated. All you need to do is have it open and regulate BP wherever you want it set. Boost is irrelevant. The wastegate technically should be all ran off the exhaust pressure but in a diesel the soot causes problems. All your doing is relieving the pressure of one circuit. Once another separately acting pressure circuit is used to control it then it becomes harder to tune. To each their own. The op can only make the gate open at a lower pressure two ways, 1-use boost to overcome spring pressure and boost to hold it closed. 2-take some spring pressure out and just use boost to hold it closed for fine adjustment. Both ways work. [/QUOTE]

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