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Old 05-22-2012, 08:45 AM
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Screaming turbo

I just did some work on my truck (STC, EGR delete, standpipes, dummy plugs, new IPR screen, ICP). Now that everything is back together the turbo really screams from about 10 psi and up. I know a lot of guys want loud, screaming turbos, and mine was pretty loud before, but this doesn't sound the same as before. I'm wondering - a) Can any of those changes cause a change in the tone of the turbo whistle? and b) If not, what might be causing this?

Truck runs and drives like a dream, plenty of power and boosting properly, just making a totally different sound now and I'm just a little concerned. I really hate fixing one thing and another going bad.
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Old 05-22-2012, 08:51 AM
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I would bet that one of the exhaust fittings is loose. The Y pipe to turbo connection can be a real PITA to get sealed right. Or maybe the fittings on either end of the up-pipe. Look for soot around all those fittings. The fact that it's boosting ok is odd, but nothing you did should make the turbo scream
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Old 05-22-2012, 09:42 AM
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Does it sound like this at idle


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Old 05-22-2012, 03:56 PM
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Nope, sounds fine at idle. I've decided it sounds like a tea kettle when I accelerate though.
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Old 05-22-2012, 04:30 PM
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Headgaskets? that's what tea kettle sound could be.

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Old 05-22-2012, 05:24 PM
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Loose turbo boot.....maybe.

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Old 05-22-2012, 07:40 PM
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Quote:
Originally Posted by 2006PSDSD View Post
I would bet that one of the exhaust fittings is loose. The Y pipe to turbo connection can be a real PITA to get sealed right. Or maybe the fittings on either end of the up-pipe. Look for soot around all those fittings. The fact that it's boosting ok is odd, but nothing you did should make the turbo scream
I am going to have to agree with the above post. When I cleaned my Turbo the up-pipe made me do some things that I am not proud of. I had to take a 3 ft pry bar and PUT OUT on it while my buddy worked the air ratchet. That finally got it. That was about the 10th time I had tried. It can be a real pita the clamp will not pull it together right.

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Old 05-22-2012, 11:20 PM
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I put in a new turbo last week or so. I was so focused on getting the Y up pipe right, I got lazy on the down pipe side.

When I laid into it, it sounded almost like a train horn. At idle and low boost, sounded fine. Boost over 10? Wow, it was terrible. Checked both connections, and it turned out being the down side.

Disconnected the down pipe from my CAT delete pipe, and re fitted the down pipe to the turbo. Silence is golden. Well, except for the turbo whistle. Which I expected. And I'm growing fond of.
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Old 05-23-2012, 04:16 AM
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Took me three times to get the up and down pipes aligned perfectly.....keep at it!
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Old 05-23-2012, 07:05 AM
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I just noticed that the CAC tube (I think thats what its called) at the front of the intake is spitting an oily mist out of the area where the neck of the tube mates with the intake manifold. Could this be causing the noise I'm hearing? And what would i call that neck to find new gaskets for it?
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