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05 460 boost

johnsmack

By johnsmack
in Engine and Transmission

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johnsmack Rookie

johnsmack

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I have an 05 with the 460,  new turbo 15000 miles ago. under full load turbo is consistent at 35 psi.  when i drive  empty at 1400 to 1600 rpm boost builds to 20 psi or so and then dumps then comes right back up.  what might this be?

 

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