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Got an 05 6.0L and I usually push about 20-23# of boost when getting on it. But lately I've been pushing about 30-35# and after about 20# my turbo whistles louder.(no I dont sit and ride it over 20#) I did have a cracked intercooler boot, replaced but still doing it. I'd assume it's an air leak, just not sure where to look?
 

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I've heard cracked up-pipe bellows whistle quite loud.
 

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Wonder if the vgt is stuck closed around the hot wheel over speeding it too


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I've heard cracked up-pipe bellows whistle quite loud.


Ya but wouldn’t cause boost to build though


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Wonder if the vgt is stuck closed around the hot wheel over speeding it too


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I would put money on the VGT being stuck/sticky/bound up.

You shouldn't ever be getting 35psi of boost......sounds high. I think "normal" is 25-29 when under load.....less when not loaded.
 

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Before saying the boost is "high," let's ask @Kshellum if he has any tuning?.......

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Before saying the boost is "high," let's ask @Kshellum if he has any tuning?.......

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Well....he said that he "normally pushed 20-23psi of boost".....that's low with a tune, or without one. As far as the 35psi of boost he's getting now...are there any tunes out there that will bump it up that high? I have several IDP tunes.....(towing, street, extreme), and none put out more than 29psi of boost under load. 35psi sounds like a bunch.
 

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I guess it could be. I was doing 40 before replacing Injectors, with a fooler.

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