Exhaust changing tones - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 03-23-2010, 11:22 AM Thread Starter
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Exhaust changing tones

I have a 5" MBRP turbo back exhaust and recently put a muffler on it. I have noticed that when the truck is idling the exhaust sound changes to a deep throaty noise that you would expect to come out of a gas truck. This only last for a few seconds and then the turbo noise kicks back in and the truck sounds normal. Any ideas on what this could be?
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post #2 of 6 Old 03-23-2010, 11:24 AM
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Originally Posted by rolltideroll989 View Post
I have a 5" MBRP turbo back exhaust and recently put a muffler on it. I have noticed that when the truck is idling the exhaust sound changes to a deep throaty noise that you would expect to come out of a gas truck. This only last for a few seconds and then the turbo noise kicks back in and the truck sounds normal. Any ideas on what this could be?
It's the vanes opening and closing (cycling) in your turbo. If I'm wrong I will sell my truck for $3.00 to the person who corrects me..

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post #3 of 6 Old 03-23-2010, 11:29 AM
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Originally Posted by azkcr View Post
It's the vanes opening and closing (cycling) in your turbo. If I'm wrong I will sell my truck for $3.00 to the person who corrects me..
your wrong. i dont feel like going into details but do you take paypal?

thats kind of odd. so it changes tone while runing? why i start mine up it has a deep v8 rumble for like maybe 3 or 4 seconds before turbo kicks in but that tone never comes back at idle after the truck has been started
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post #4 of 6 Old 03-23-2010, 11:45 AM
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Originally Posted by mx730md View Post
your wrong. i dont feel like going into details but do you take paypal?

thats kind of odd. so it changes tone while runing? why i start mine up it has a deep v8 rumble for like maybe 3 or 4 seconds before turbo kicks in but that tone never comes back at idle after the truck has been started
In all reality, I will sell my truck for cheap.... Reason being??? It doesn't run.. lol

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post #5 of 6 Old 03-23-2010, 12:07 PM
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As mentioned, that's the vanes in the turbo. When the truck first starts, they're in a position optimal to starting. Once the motor begins idling and the computer has "caught up", so to speak, the vanes change their pitch and the exhaust note changes.

During idling, the vanes will change pitch slightly based on system conditions and you'll hear the exhaust note change during these times.

Perfectly normal.
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post #6 of 6 Old 03-23-2010, 12:48 PM
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the new flash VXCF9 causes the VGT solenoid to cycle and causes that sound itll do it every time you start your truck from the exhaust but itll do it in park and idle at stop light or somethin like that as well. Perfectly normal it does it to keep the vanes from clogging or at least try to stop it from clogging.
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