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Hood Rich
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2,873 Posts
Discussion Starter #1
I replaced my up pipes with the single piece because I was too dam lazy to see if the gaskets were even leaking. Well they werent and I still have the same sound in cab. I had small load(1500lbs) on and with a 60 MPH head wind I heard it alot. I had my tow tune on and it got even louder and EGTs were rather high... Its about when you shift into 3rd or 4th a loud rush of air that bursts, than quiets but still says vocal... I might go grab a video... Wastegate is D/C'd also...
 

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Hood Rich
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2,873 Posts
Discussion Starter #2
this is just after shifting into OD.

 

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Village Idiot
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8,209 Posts
Yrying to hear the burst at the end but cant make it out right now, cant turn up the sound...
You do know what turbo stall sounds like eh.
not that is it.
 

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Hood Rich
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2,873 Posts
Discussion Starter #5
burst sounds is when i let off... the whole video is in 4th gear. just cruising than slowly speeding up, than letting off
 

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Village Idiot
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8,209 Posts
Turbo stall will do that,, it is a woosh like an airbrake. Normal.
Prob not a great habit to practice repeating over and over
But not sure where your high egts are from, heavier load and hot tune maybe.
 

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Registered
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1,102 Posts
Get a ported compressor housing, almost sounds like surge. Mine used to surge when I had a load and the Rpms were under 2500 accelerating. BTW what were the EGT's??
 

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Hood Rich
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2,873 Posts
Discussion Starter #8
I was seeing low to mid 900's...
 

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Busy Busy
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9,004 Posts
Can't watch video but even with wastegate disconnected.....it can still open.
 

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Paul
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160 Posts
I was seeing low to mid 900's...
If that is post turbo I would agree it is high. If your probe is pre-turbo, your fine. It sounds normal to me. If it makes you feel better you can build a boost leak detector and check the whole thing over carefully.
 

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I know nothing...
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6,115 Posts
Mine does that to, it happens after shift and will stay until I let the boost fall to 0. Is that the wg sticking open Marty?
 

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Paul
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160 Posts
It's a turbo stall. When you let off the drive pressure drops imediately. The intake or compressor side of the turbo is then unable to hold the pressure that has built in the intake plumbing and intercooler so some of the air pushes back out of the tubo causing the sound you hear.
 

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Hood Rich
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2,873 Posts
Discussion Starter #13
hmm...
 

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Village Idiot
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8,209 Posts
What kind of turbo is this anyway?
Stock, 38r?
 

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I know nothing...
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6,115 Posts
It's a turbo stall. When you let off the drive pressure drops imediately. The intake or compressor side of the turbo is then unable to hold the pressure that has built in the intake plumbing and intercooler so some of the air pushes back out of the tubo causing the sound you hear.
But it should go away when the psi drops, from what I understand and how mine acts its still blowing after equalization.

I tracked mine this morning thinking of this thread. It pops off under just regular DD load. I let it whistle for several miles even after I set the cruise. I did notice that once it throttled up to climb a hill it wil close up and gain power. This has for to be WG. My vac is unhooked but I've never adjusted the tension.
 

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Hood Rich
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2,873 Posts
Discussion Starter #16
stock turbo
 

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Paul
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160 Posts
I must be hearing something else in the video.
Have you checked for boost leaks? I mean like built a boost leak detector and used air pressure to find leaks?
 

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Hood Rich
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2,873 Posts
Discussion Starter #18
That I have not. We got boost and exhaust leak plugs ad reulator at work. One of these days Ill check it out deeper
 

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Paul
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160 Posts
Use plumbing adapters and a pressure regulator. I drilled and tapped a plumbing cap (can't remember what size) so I could screw on the pressure regulator. Then attach it to the turbo inlet with a 3 in. rubber coupling (also from the plumbing department) to the turbo inlet. Make darn sure the clamps are tight. Clip your air hose on and dial the pressure up to about 15 psi and listen for leaks. Some soapy water is also helpfull. You need a good air supply for this to maintain pressure as air will leak through the engine. CAUTION! Stand clear of the leak detector when it is pressurized. Even at 15 psi it can be dangerous if it blows off.
 
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