If you watch the pulling trucks, they run a spring loaded gate which shuts off the turbo intake opening upon cutting the throttle at the end of the run.The only reason your problem would be connected to the wastegate would be because the wastegate isnt opening properly and allowing you to build too much boost.
Most diesels dont have an intake venturi so therefor using a pop off valve or blow off valve isn't common, although guys who build big boost may install one to help give the pressure an exit. The HX35 is capable of a little more boost (35 psi) but the real difference between the two is the housing size. If you're pushing that kinda boost or more, this is why your hearing the turbo bark.
Given your your truck year and tranny, I believe you have the HY35 which is good to about 30 psi before your out of map range and the turbo is spinning to fast, creating more heat than its doing good. Very bad and will eventually cause damage depending on the level of boost created and how far out of the turbos map. Barking is the extreme pressure shoving its way violently back through the compressor and can actually cause the impeller shaft to stop and spin backwards. But.wind up the turbo too high and chop the throttle to harshly and that howl will turn into a "bark". The higher the boost, the louder the howl.
#Cummins turbo flutter manuals#
Turbos will "howl" when the pressure pushes against the compressor and manuals are more common to hear that too while shifting gears since auto's dont generally chop the throttle. All that pressure has to go somewhere so it tries to go back out the way it came in. AH64ID is exactly right on why it happens.
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