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Old 06-02-2011, 08:37 PM
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Turbo shut down noise

2005 F250, 79,000 miles, super clean Oasis, everything functioning great...but I have one concern:

Upon shut down...I hear the typical turbo spool down noises as I would expect to hear. But it seems right before it reaches zero rotation...say 2 seconds before stop...it changes sound and gets "noisy" in my opinion. Not whistle noise...but something else. Like hissing or constant huffing??? It definately changes tone.

Would this be normal or should shut-down be "silent" once down to low rpms on the turbine shaft? I'm guessing the variable vanes are doing something at the end making this sound...which I'm calling harmless.

I'm only familiar with non-variable turbos on Cummins and Duramax engines. Perhaps I need to go listen to another 6.0L to compare.
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Old 06-03-2011, 10:27 AM
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not really sure, bud. here's a bump though. i'm subscribed as my 05 has been getting a bit noisier as well at times. jl
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Old 06-03-2011, 11:18 AM
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Sounds normal to me, sounds just like an aircraft propeller right before it stops rotating, it's a clear change in pitch of the sound of the rotor, in this case the turbo vanes, it's caused due to the speed at the trailing edge of the blades moving slower than supersonic. The faster the tips of the blades go the more high pitched a sound it will give (it's why turbos "scream" at high RPMs and why the 03's scream louder than the 05+ due to the fewer and larger turbo blades).

Yay my $60k worthless Aeronautical Engineering degree finally came in handy! haha
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Old 06-03-2011, 03:19 PM
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I don't think its a turbo going out...but rather a noise that may be common to the VGT on this truck (I'm hoping). It's not really loud enough or bad enough to sound like something in failure mode. Its just now what I expected, having heard many turbos spool down at shutoff. I pay close attention to too many things all the time.

I seem to have an acute sense of hearing at times. Perhaps too sensitive.

I'll have to get someone to shut the truck down while I'm right up there near the turbo so I can pinpoint the sound. Probably ought to take the intake tract off and check the inducer wheel too for any obvious signs of a problem.
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