Hair dryer sound - Ford Powerstroke Diesel Forum

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post #1 of 34 Old 07-31-2012, 08:54 AM Thread Starter
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Hair dryer sound

So does anyone actually know what causes the hair dryer sound. Been running the 310 tune for as long as I can remember, got use to it. Went down to the 210 tune for the first time since I tuned my truck. I was backed up unhooking a trailer my truck was sitting there at idle and the hair dryer sound went away for about ten seconds then came back. I was just curious what turned on/off to make it go away for a few seconds

2009 F-250
Spartan tuned, S&B intake, flo pro duals

2000 F-250
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post #2 of 34 Old 07-31-2012, 10:10 AM
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I'm sure it's just the amount of air flowing thru the exhaust. Kinda like if you blew thru a straw. That's why guys running bigger exhausts say its less noticeable. I'm sure in the lower tune and at idle there was just less air flowing at a super high velocity.


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post #3 of 34 Old 07-31-2012, 11:24 AM
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i know it's from your turbo...but if it cut off, i might be concerned with your turbine wheel...i've been very wrong before though.

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post #4 of 34 Old 07-31-2012, 01:09 PM
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If you think thats weird listen to a 6.7l cummins straight piped when the exaust break is turned on while parked. It really makes a weird noise.

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post #5 of 34 Old 07-31-2012, 02:48 PM
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betting it's the EGR cycling on the 210 tune
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post #6 of 34 Old 08-01-2012, 04:32 AM
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Its the EGR valve cycling, it doesn't cycle on the big tunes.

08 F250 CC, 4x4, Blue/Pueblo Gold, 3.73, S & B CAI, 5" Magnaflo downpipe back, Spartan TCM 275 & 310 KEM 345 (SCT - Sold) Mickey Thompson 35 12.5 20's

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post #7 of 34 Old 08-01-2012, 06:48 AM
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I don't know about spartan but with H&S the egr is turned off. None the less even with an egr delete it will sound like that. It's the compound turbos that make it sound that way.


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post #8 of 34 Old 08-01-2012, 06:51 AM
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But I don't know why it would stop making that sound for a few seconds. Mine never stops making that sound.


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post #9 of 34 Old 08-01-2012, 07:23 AM
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its the egr valve forsure mine did it all the time at idle I could hear it when I was hooking up a trailer for about 10 seconds like you said then when I did the EGR delete it just hair dryer sound all the time my wife hates it and I tell her its payback for the hours I have had to listen to hers!!!!

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post #10 of 34 Old 08-01-2012, 07:29 AM
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It is the EGR valve opening that cause the hair dryer sound to stop for a bit. The volume of exhaust flow is decreases when the EGR opens and allows exhaust into the intake which relieves the pressure that the exhaust created before it entered the turbos. This relief in pressure stops the hairdryer sound. ford engineers design the best (sarcasm)
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