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Old 01-09-2011, 10:43 AM
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question about exhaust sound

just put straight 4" turbo back exhaust into stacks on my 04, and i just had a couple questions about the way it sounds. When I first start it up, it sounds mean, but then after about 5 seconds it goes kinda quiet and stays like that, i noticed most of the 6.0s straight piped do this. Any ideas why? and if I can change it so it doesnt do that?

Also, i noticed everyone else with 03 and 04 6.0s straight piped has an insane turbo whistle, and mines okay, but not nearly as loud. any thoughts? thanks guys
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Old 01-09-2011, 11:04 AM
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When you first crank it the turbo is not spinning. So for a few seconds it will sound like a big block. All of the 6.0s do nothing to worry about. I also have stacks and when I first installed them on my 03 I didnt have the jet fighter whistle, so I took the turbo off and cleaned all the build up off the turbine side, now the whistle will damn near bust windows out. It sounds BAD ARSE..LOL
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Old 01-09-2011, 11:14 AM
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ok thanks for the info, and so how come with the 7.3s it doenst get quiet like that? my buddys got stacks on his 7.3 and it starts up and sounds pretty much the same the whole time.

And ill definitely do that with the turbo, how much did you have to take that apart to clean it out?
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Old 01-09-2011, 11:21 AM
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The 7.3 does not have a variable geometry turbo like the 6.0L. As the vanes open and close the pitch of the exhaust changes. If you have the newest flash memory update from Ford it includes a command to adjust the turbo vane position at idle in order to avoid sticking from lack of usage that occurs when the truck isn't operated for sufficient time to avoid corrosion and carbon build up.

The turbo clean up "how-to" is available through Diesel Technician Society here:

Diesel Technician Society

Enjoy!

Jonathan
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Old 01-09-2011, 11:26 AM
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I would have to guess on the 7.3 . Maybe different style turbo, big block vs small block. There are alot of write ups on the cleaning process on here. I didnt find it too hard. Try this it is what I followed. Diesel Technician Society
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Old 01-09-2011, 11:27 AM
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howell jd beat me to it
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Old 01-09-2011, 12:14 PM
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ok, that makes sense now about the exhaust tone changing, and ill definitely have to do that with my turbo, i was kinda disappointed when i first started it after puttin the stacks and found that i could hardly hear the turbo... thanks for the help guys
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Old 01-09-2011, 04:18 PM
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Mine also does that. But it also will sometimes start as a deep sound then go to a whistle then back to a deep sound after idling for some time. Does this mean there is problems with turbo? I also just had truck flashed to latest flash, could be new flash commanding turbo to adjust turbo vane position? Not meaning to steal thread!!!
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Old 01-09-2011, 04:54 PM
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no you are fine, the new flash "flexes" the vanes of the turbo so the carbon build up doesnt build up enough to corrode the vanes and not let them move so the turbo flexes or opens and closes during idling to keep it from sticking. it doesnt just do it when you first start it either if you drive then park and let it idle, it will do it then too. its nice cause it kinda gives you peace in mind so the carbon doesnt keep building up and cakes up the turbo
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Old 01-09-2011, 05:00 PM
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when u get on it your deff going to hear that turbo whistle
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