Turbo noise?
Hotshot
Joined: Dec 2006
Posts: 14,069
Likes: 17
From: Melbourne, Ky
Has it been deleted?
Factory intake or aftermarket? If aftermarket, what brand?
I only know what a deleted truck sounds like. I don't know what it sounds like if the DPF is plugging up. I do know what turbo surge is with the 6.4. That actually sounds really no different that that of a 7.3, a rough, metal against metal sound. Only happens when trying to build more boost then what the motor can handle at low RPM's.
Can you monitor Exhaust Back Pressure as well as Turbo Boost? If so, can you get us some numbers? Generally on my deleted truck, EBP is usually 2lbs more than boost, but sometimes that can jump to 10lb variance. If cold it can be way more than that.
Factory intake or aftermarket? If aftermarket, what brand?
I only know what a deleted truck sounds like. I don't know what it sounds like if the DPF is plugging up. I do know what turbo surge is with the 6.4. That actually sounds really no different that that of a 7.3, a rough, metal against metal sound. Only happens when trying to build more boost then what the motor can handle at low RPM's.
Can you monitor Exhaust Back Pressure as well as Turbo Boost? If so, can you get us some numbers? Generally on my deleted truck, EBP is usually 2lbs more than boost, but sometimes that can jump to 10lb variance. If cold it can be way more than that.
New User
Joined: Nov 2015
Posts: 6
Likes: 0
This truck is in such good condition that even the undercarrage is origanal powdercoat black. 30,000 miles less than where they would eclxpect it to be. I don't know anymore, but I'm honestly considering suiting my job and become a full time mechanic for Ford. Might as well get paid for it.
Hotshot
Joined: Jul 2013
Posts: 14,266
Likes: 2,188
my theory is the grinding noise is carbon being hit by the impeller. I have a 6.4 thats was doing the same thing and after running a popular fuel additive at 4 times the normal use mixture and drivinging it for two hours on the highway, the noise is gone, which I think is becuase the carbon got loosened up and no longer is being mowed by the impeller. to avoid a debate about snake oil or not, I wont get into the name of the fuel additive but I will say that it has been around for over 80 years and I have been using it for over 40 years.
other thoery's are welcome.
other thoery's are welcome.
Lead Driver
Joined: Jun 2007
Posts: 6,757
Likes: 5
From: Corvallis, OR
True, I was thinking most additives would be converted to carbon at that point. If not, it could be damaging to the cat.
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Hotshot
Joined: Jul 2013
Posts: 14,266
Likes: 2,188
Turbo is two impellers connected with one shaft. One impeller is spun up by exhaust gas, the other spins up intake air pressure. The hot side of this system accumulates carbon and fuel additives that break down carbon will act on carbon on the hot side of the turbo ad 100% of the fuel additives does not get burnt ....think about cat converter cleaners used by gas engines.
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