Hissing Sound ? - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 05-12-2019, 10:50 AM Thread Starter
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Hissing Sound ?

Let me start like I start all my post. I am new to the diesel world so I am sorry of this is a stupid question.
I have an 01 and when accelerating and holding the gas down under load ( like a hill pull or incline where I am accelerating) I get a hissing sound from under the hood. It’s pretty loud and can hear it over the radio if it’s on. It stops when I release gas pedal. My truck does have a cold air filter kit, not sure of the brand. Is this hissing normal and do these trucks have a blow off valve for the turbos and would that be what I am hearing. Also when the truck shift through gears normally I get the noise of hissing or released air when the truck switches up to the next gear.

I am definitely not complaining about the noise because it sounds kind of good like a blow off valve but weird that it makes the noise under heavy acceleration also. Just want to make sure what I am hearing is normal.

Truck has a hydra chip installed but it was on there when I got the truck.

Any help would be appreciated.
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post #2 of 15 Old 05-12-2019, 11:37 AM
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That's the turbo spooling.

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post #3 of 15 Old 05-12-2019, 04:06 PM Thread Starter
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Even after I let off the gas? Also if I accelerate and stay in the gas the swooshing sound will stay at a constant tone and loud.

Like I said after the truck shifts through the gears it sounds like air is being released as soon as it goes into the next gear.
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post #4 of 15 Old 05-12-2019, 04:12 PM
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That is your wastegate opening. When you let off the gas pedal, the pressure your turbo has built up has to go somewhere, so the wastegate opens to allow it to dissipate


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post #5 of 15 Old 05-12-2019, 05:32 PM Thread Starter
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Does the wastegate open while you have the accelerator down also. If I accelerate hard or have boost over 10 or so I hear the air swooshing sound the whole time I am accelerating.
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post #6 of 15 Old 05-20-2019, 07:05 AM
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The wastegate is responsible for diverting exhaust pressure from the turbine housing on the turbo to the exhaust stream. At full boogie the wastegate could be partially opening which will keep the turbine drive pressure at a safe level. People have been known to adjust the wastegate rod tighter which will consequently require more exhaust pressure to open the wastegate and cause elevated boost levels.
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post #7 of 15 Old 05-20-2019, 07:07 AM
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Blackout

If your only making 10lbs of boost at WOT you have other issues to work through also.

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post #8 of 15 Old 05-20-2019, 07:12 AM
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Quote:
Originally Posted by 7.3_TurboDiesel View Post
That is your wastegate opening. When you let off the gas pedal, the pressure your turbo has built up has to go somewhere, so the wastegate opens to allow it to dissipate


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What your referring to is a blow off valve which our trucks don't have from the factory.

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post #9 of 15 Old 05-20-2019, 08:25 AM
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I recently made some boost leak pressure detectors for my 6.0. There's a couple of videos, but I have a 6 gallon compressor with 1/4" air hose. I used:

-4" or 3" rubber pipe caps. They come with a worm clamp to tighten them tightly on the pipe. They're available at home depot and size depends on whatever pipe you're pressurizing.
-1/4" quick disconnect for the air hose. I inserted the male end through a hole I drilled in the rubber pipe cap.
- 2" fender washer with a half inch hole. I got two of these. One went on the the inside of the rubber cap, the other on the outside. This kept the Quick disconnect from blowing out.
- A 3/8 to 1/4 NPT Reducer. Went inside and acted as the washer to secure the quick disconnect on.

That took about $20 to make.

For the Gauge:
-I also bought a 1 foot long Male threaded, 1/4" air hose
-I screwed this into a 1/4" NPT Tee that had two male ends and a one female end.
-On one side, I had a 1/4" NPT air valve to turn on and off.
-I attached a 1/4" NPT Quick disconnect, one male and one female to two sides. (I needed a Female to FEmale 1/4" NPT attachment to attach the QD to the tee.
-I put a 1/4 NPT 0-30 PSI gauge on the female part of the TEE.

That cost about an additional $30 to make.

Boost leak detectors are available from around $75, and mine cost $50. The commercial one will hold more PSI, mine blows off on 5-10 PSI. I've put up to 45 PSI on the commercial one, but the commercial one usually blows a metal plug out around 10 to 15 PSI, which is quite dangerous. The metal plug is basically a 4" round plug inside a CAC boot. That's come within inches of my face when it blew out. I don't like that idea at all.
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post #10 of 15 Old 05-21-2019, 01:19 AM Thread Starter
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Quote:
Originally Posted by wickettoby1 View Post
What your referring to is a blow off valve which our trucks don't have from the factory.
But they have some type of waste gate factory installed?? Someway for the pressure to be expelled??
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