6637 filter intake Hwy sound? - Ford Powerstroke Diesel Forum
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Old 03-21-2013, 03:43 PM
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6637 filter intake Hwy sound?

Has anyone else had the problem with a loud reverb-type sound at freeway speed with these intakes? I get up to between 65 and 70 and it's almost unbearable. It's not really there slower or faster. It's not the increased airflow sound or the turbo spooling, I like those sounds. This seems like some kind of harmonic effect, low pitched...

I have a 5 speed, 3.55, and it's a purchased Tymar setup.

Thanks,
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Old 03-22-2013, 12:15 PM
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So, it's looking like I'm the only one who's ever experienced this....
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Old 03-22-2013, 12:40 PM
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Can you describe this reverb sound better?
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Old 03-22-2013, 01:25 PM
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Sure, I'll try. I guess I'd describe it as like the sound that some of the kids put on their little Japanese cars, a real resonance, without the "braaap" part. Also at a lower pitch. Maybe like it's cavitating, for lack of a better word. I do not have it bolted down yet, because most on here say it's fine to leave it loose.

Like a said it's only over a short speed band, it just happens to be at the speed I drive most of the time.

Thanks,
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Old 03-22-2013, 01:33 PM
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Try bolting it down, it's probably sucking air around it, not sure where you read to leave it loose, mine is tight as hell, this is a turbo application, it will suck any air it can and usually from the path of least resistance, I.e. around your filter and through it, but I am also having a hard time understanding the sound you hear tho, maybe ebpv? But I'm sure someone will chime in that has fixed this before
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Old 03-22-2013, 02:01 PM
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Thanks. It's definitely something to do with the filter set-up. It's the only change I made before this sound started. Sorry I can't describe it better. You know how in some rigs, when the windows are down, there is an air pressure sound that sort of fluctuates? Screws with you ears a little. That is the kind of sound this is.

This may be a lost cause, trying to explain. Maybe I'll stick it back on and try and get it on a video clip.
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Old 03-22-2013, 02:06 PM
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Also, I didn't mean the you leave all of the clamps on the filter and pipes loose, i meant the whole setup. All of the joints on mine are nice and tight. The Tymar kit comes with a bracket wrapped around the filter that you can anchor onto something, like the wheel well.
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Old 03-22-2013, 03:18 PM
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it's probably the exhaust.....when you changed the intake, it changed the airflow thru the engine, and you're getting some resonance....you may have to change your exhaust some to get rid of it....,
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Old 03-22-2013, 03:51 PM
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That would suck....I just installed a 4" system on it, before I got the intake.
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Old 03-22-2013, 08:44 PM
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did you use a muffler ? or straight exhaust ? ....if it's straight, go get a 4" 36 inch straight thru muffler and put in the long straight piece of pipe under the back of the cab, and it'll help a LOT !
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