Bad turbo? - Chevy and GMC Duramax Diesel Forum
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post #1 of 5 (permalink) Old 07-04-2009, 05:55 AM Thread Starter
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Join Date: Mar 2009
Location: niverville MB canada
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Bad turbo?

What would be the signs of a failing turbo? Mine has gotten louder[maybe just the new tune?]. My boost is also falling off roughly 5 psi. When I hammer it boost goes to 34 then falls off to 29ish. I don't have the LBZ mouthpiece on yet but i ordered it a week ago so it is on its way.[fingers crossed] Is the stock LLY mp a big part of my problem? I have another stock charger i can put on if mine is toast but I really don't want to unless i have to.
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post #2 of 5 (permalink) Old 07-04-2009, 07:46 AM
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Location: A little house on the prarie, NE
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With a tune it can change how the turbo sounds, and if you're making 29psi then it's 100% healthy. It's normal for it to spike just a little. Once you do the mouthpiece upgrade you'll notice a nice difference as well.

Don't waste your time changing chargers, the other one will just do the exact same thing... make noise and boost :tease It's perfectly fine, don't sweat it.

2004 LB7
Tastefully modded
Lots of miles
Built by Husker Diesel
1995 Chevy 2500 - 12v/NV4500 Swap
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post #3 of 5 (permalink) Old 07-04-2009, 11:44 AM Thread Starter
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I also had FASS lift pump put in at the same time. Could that be the loud whining sound i am hearing?
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post #4 of 5 (permalink) Old 07-29-2009, 09:05 PM
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yes it could

2002 LB7
Intake: AFE Proguard 7
Exhaust: 4" mbrp
Turbo: Turbonetics GTK 650 with PPE Pedestal
Electonics: EFI LIVE tuned by Jess
Fuel: Fass Fuel system
Tranny: Transparts stage 4 & ML precision converter
2011 6.7 cummins ccsb laramie metallic grey DPF/EGR fell off WTF
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post #5 of 5 (permalink) Old 08-04-2009, 12:33 PM
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A buddy of mine has a Air Dog 150 lift pump and his started whining and it got so loud he had to send it back and they sent him a new one.
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