hairdryer exhaust - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 24 (permalink) Old 01-15-2011, 01:33 AM Thread Starter
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hairdryer exhaust

I realize that I should've done a nice complete 4 or 5" exhaust all the way from the downpipe, but I didn't. Kept the 3.5 all the way to the muffler or resonator, whatever it is when I deleted the DPF/DOC. I understand the hardryer sound is coming from my vented tailpipe. What are most of u guys replacing this with?
Thanks, Tom

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post #2 of 24 (permalink) Old 01-15-2011, 02:55 AM
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The hairdryer sound is not from your exhaust tip, it is from your turbos.

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post #3 of 24 (permalink) Old 01-15-2011, 01:52 PM Thread Starter
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I respectfully disagree w/ you Sir. Why would the turbos have anything to do with it @ 0-1 PSI. Just to check, I went out and wrapped some towels around the vents...and it was gone and sounded 100% better. So back to my ?, what are most people using for the 3.5" DPF back?
Thanks, Tom

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2003 F-250 4X2 Lariat CC SWB 7.3, MBRP 4" single exhaust, DP Tuner 40-60-80-120, AFE PG7 Stage II Intake, ITP OverBoost Anhilator, DiPricol Optix Boost-Pyro-A/T Temp Gauges (SOLD)
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post #4 of 24 (permalink) Old 01-15-2011, 05:04 PM
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post #5 of 24 (permalink) Old 01-15-2011, 06:06 PM
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Quote:
Originally Posted by tstc View Post
I respectfully disagree w/ you Sir. Why would the turbos have anything to do with it @ 0-1 PSI. Just to check, I went out and wrapped some towels around the vents...and it was gone and sounded 100% better. So back to my ?, what are most people using for the 3.5" DPF back?
Thanks, Tom
Tom,

How much to do you know about the turbo's on these trucks? Did you know that the sequential setup consist of an atmospheric charger and a VGT (variable geometry turbo)? Have you ever heard of a VGT duty cycle? Did you know that even when the turbo's are not spooled, the VGT duty cycle is active?

So....back to your question. A more thorough answer to your question would have been that the tubo's are the reason for the hairdryer sound and you will never fully get rid of it.

Here are your options though....

1. 4" downpipe back exhaust. It will slightly deepen the tone of your hairdryer sounding exhaust.
2. 4" turbo back exhaust. Once again, it will slightly deepen the tone of your hairdryer sounding exhaust.
3. 4" downpipe in to a 5" downpipe back exhaust. It will REALLY deepen the tone of your hairdryer sounding exhaust....but I assure you it will not rid you of it. This is the setup I have currently.
4. 4" exhaust w/muffler. It will just about make your exhaust as quiet as stock....and get rid of a good bit of the hairdryer. If your up for super quiet, go for that route.
5. 5" exhaust w/muffler. Probably the best option for dampening the hairdryer sound. It will still be there, but not as pronounced as a straight exhaust. Doing 5" with a muffler will also still give you that throaty hard throttle sound.
6. Swap your turbo's out to either a compound setup without a VGT or a single non VGT.

Hopefully this helps you out....and prevents you from wrapping a towel around your exhaust tip again.

Jeff Dodd - www.SpartanDieselTech.com
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post #6 of 24 (permalink) Old 01-16-2011, 08:48 PM
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I respectfully disagree with both of you, in part.

If you are referring to the louvered exhaust vents prior to your exhaust tip. Then the sound you are hearing is the venturi effect which actual compounding the turbo sound. As the exhaust is rushing out the tip the movement of exhaust is sucking air in through these vents. The process increases your exhaust flow which in effect creates vacuum in the upstream exhaust pipe removing pressure from the backside of the turbo.

There is an increase in turbo noise due to the relief in pressure but most of the sound is from the air rushing in and then out the tip.

I actually like it. I just tell people my truck is the one that sounds like a Jet...



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post #7 of 24 (permalink) Old 01-16-2011, 09:06 PM
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If you don't believe what was said above, go buy a new exhaust tip and see if your happy with it. When it doesn't make a difference, reread the post above and pick your new exhaust. I have a for inch turbo back and don't like the hair dryer sound I have.I plan to go to a five inch with a muffler sometime soon. Just not sure which muffler yet. The time can make just as much difference as the exhaust though, my 250 time has almost no hiss while the 310 has a ton... THE 310 has more back pressure...

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post #8 of 24 (permalink) Old 01-17-2011, 03:17 AM
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Quote:
Originally Posted by Bighurt View Post
I respectfully disagree with both of you, in part.

If you are referring to the louvered exhaust vents prior to your exhaust tip. Then the sound you are hearing is the venturi effect which actual compounding the turbo sound. As the exhaust is rushing out the tip the movement of exhaust is sucking air in through these vents. The process increases your exhaust flow which in effect creates vacuum in the upstream exhaust pipe removing pressure from the backside of the turbo.

There is an increase in turbo noise due to the relief in pressure but most of the sound is from the air rushing in and then out the tip.

I actually like it. I just tell people my truck is the one that sounds like a Jet...
You do know that the vents are there for heat reduction at the exhaust tip during regeneration.....correct?

Not sure where you heard the information that you presented above, but it is news to me.

I have a standard MBRP tip on my exhaust, no vents anywhere, and the hairdryer sound is still very much there. I assure you that the vented exhaust tip has nothing to do with the hairdryer sound. It is VGT related. Same with the newer Duramax's. The VVT turbo's that they have (similar to a VGT) cause their exhaust note to have a pronounced hiss to it, unlike the LB7 Duramax which did not use a VVT turbo. Compare the exhaust note of a 7.3 and 6.0. 7.3 does not use a VGT, the 6.0 does. Same with the 6.4. If the VGT duty cycle is active, you will have hiss.

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post #9 of 24 (permalink) Old 01-17-2011, 03:47 AM
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jeff stop waisting your time. haha he wont get it. let him find out the hard way.

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post #10 of 24 (permalink) Old 01-17-2011, 03:58 AM
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