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My 283 whistles from the turbo, but I'm not sure the tip turbine makes any noise. Tip turbine is basically powered by wastegated turbo pressure.

What conditions cause the air hiss? Under full load? Partial load? Certain rpms?

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7 hours ago, Ditchdiggerjcf said:

Tach wasn't working when I brought it home, but the noise gets prgressively worse until you fall off the turbo at around 2k. It is at it's worst around 55 mph which I figure is about 1700-1800 rpm.

Sounds like a boost leak.    terry:MackLogo:

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I used to have about six U models with tip turbines. Occasionally the silicone gasket around the intercooler element would fail and make a vacuum cleaner-like noise.

Pulling the intercooler and replacing the gasket usually fixed it. The corners of the gasket are thin - I was never able to get a used one to seal properly.

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