Big "gulp" sound when let off pedal? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 12-28-2011, 08:56 PM Thread Starter
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Big "gulp" sound when let off pedal?

I think i know what this is but would like to get some more input.

I just got the PHP 6-position chip.

Ive been playing around a little bit just seeing what it can do.

I noticed when i have it set to 100HP performance and give it a good amount of fuel off the line and then let off i hear a big "gulp".

Now my theory is that the throttle is slammed shut when i let off the pedal and the turbo is still spinning and the air is just trapped forcing it back to the turbo which in turn slows the turbo down causing the "gulp" sound and can hurt the turbo.

Thats my theory. But idk if that is right or not.

Can someone maybe give me some input?



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post #2 of 12 Old 12-28-2011, 11:15 PM
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You are partially right, but it won't hurt the turbo at all. My stock truck does it, I just didn't hear it until I installed the 6637 air filter.
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post #3 of 12 Old 12-29-2011, 07:28 AM Thread Starter
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I thought that can hurt it?

I mean it doesn't sound good lol Being that the turbo is forcing all that air into the engine and the throttle just slams shut and forcing it back to the turbo. I know it will slow it down quite a bit. Just thought it may wear the bearing out or could break the fins.

But anyways, if i didn't really want that to keep happening from slamming the air back to the turbo, wouldn't i install a blow off valve?



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post #4 of 12 Old 12-29-2011, 07:40 AM
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diesels do not have a throttle body with a flap that shuts when you let off the throttle like your thinking. your foot has no cable connection to the engine, just wires.

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Originally Posted by madpowerstroke View Post
Try spinning a turbo with compressed air and hit it with diesel clean as you inhale at the turbo outlet, I call it a turbo bong.........that's some good stuff, makes you come up with all kinds of crazy ideas.


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post #5 of 12 Old 12-29-2011, 09:09 AM
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post #6 of 12 Old 12-29-2011, 11:10 AM
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Not sure why you think air is "slamming" back into the turbo. The turbo always works against a given level of pressure. Really, this just isn't a problem. It's not like someone is sticking a screwdriver into the turbo every time you let off the throttle.
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post #7 of 12 Old 12-29-2011, 11:54 AM Thread Starter
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Quote:
Originally Posted by ttyR2 View Post
Not sure why you think air is "slamming" back into the turbo. The turbo always works against a given level of pressure. Really, this just isn't a problem. It's not like someone is sticking a screwdriver into the turbo every time you let off the throttle.
That be a bad day if that was to happen...


Idk, someone on here told me that when the throttle closes it will force air back to the turbo and slow it down and/or hurt it.

That id need to get a diff waste gate or a blow off valve

ToMang07: I couldnt hear anthing except the intake.

My intake sounds like that but there is a seperate "gulp" too.



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post #8 of 12 Old 12-29-2011, 01:02 PM
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Quote:
Originally Posted by irishluck View Post
That be a bad day if that was to happen...


Idk, someone on here told me that when the throttle closes it will force air back to the turbo and slow it down and/or hurt it.

That id need to get a diff waste gate or a blow off valve

ToMang07: I couldnt hear anthing except the intake.

My intake sounds like that but there is a seperate "gulp" too.
Do you have the ability to take a video/audio of it?
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post #9 of 12 Old 12-29-2011, 01:39 PM
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Again, there is no "throttle" per se. The engine will take all the air it needs. As the engine spins down, it doesn't consume as much air and doesn't generate as much hot exhaust gas, so the turbo slows down both because it doesn't have as much exhaust gas driving it and the engine isn't consuming as much air.

I've never heard of closing the "throttle" on a diesel causing turbo damage. I can't even imagine how it's possible.
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post #10 of 12 Old 12-29-2011, 03:22 PM
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Tmang07......I heard the "gulp" in your video, sounds just like my truck! I didn't notice it until I installed the 6637, and now it's very prevalent! Love it!


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