Youtube video, what is this sound? I don't think it's turbo fart - Ford Powerstroke Diesel Forum
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Old 02-15-2013, 07:46 AM
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Youtube video, what is this sound? I don't think it's turbo fart

Turbo back-pressure sound 6.4 Powerstroke - YouTube

If I let off the gas even a little, some times it happens when the truck shifts even, I get this air sound as you'll hear in the video. Louder the second two times. When I had the DPF it would do it intermittently, now it always does it. I used to think it did this when it was in regen mode. Apparently not. I don't think it's turbo fart because it used to be intermittent. I really don't have a clue though.
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Old 02-15-2013, 10:54 AM
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Mine does same thing.
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Old 02-15-2013, 12:43 PM
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mine does the same things.. the sound is coming from your intake.
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Old 02-15-2013, 01:27 PM
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That's the pressure dropping on your intake (same principle as turbo fart in a 6.0 but the dual turbo makes it sound different). It is a normal sound that is not really noticible until you install a cold air intake. My 6.4 does the same thing.
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Old 02-15-2013, 03:24 PM
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People keep saying its really bad on the turbo though and I can barely keep it from doing it. Unless I slow down VERY slowly.
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Old 02-15-2013, 04:01 PM
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It won't hurt anything. My truck did it while still on stock tuning when I installed my intake before tuning and delete.
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Old 02-15-2013, 04:16 PM
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It won't hurt anything. Jeff at Spartan has talked about this a few times. If you search in the 6.4 section, you'll find several threads asking about needing blow off valves and the consensus is that they are NOT necessary on the 6.4.
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Old 02-15-2013, 04:19 PM
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Just drive it and enjoy the intake fart
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Old 02-15-2013, 08:07 PM
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I think it sounds sweeeeeet. Everyone that rides in it asks if that's the blow off valve. Enjoy your truck man. Mine has done that for 30k miles and still runs like the day I drove it home. Actually better since tuned. Lol
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Old 02-16-2013, 07:22 AM
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Thats one of my favorite sounds.

As i understand it, Single Turbo trucks when they create the high boost they need the Blow off valve to keep from hurting the engine and or turbo.

With Twin turbos the valve isnt required because the turbos blow off threw each other.

I love that sound personally, i hear it all the time when pulling the boat.
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