FSwerks CAI installed-have resonation in cabin at high rpms - Focus Fanatics
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Old 09-21-2012, 06:35 PM   #1
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FSwerks CAI installed-have resonation in cabin at high rpms

So I just had my FSwerks CAI installed along w/Steeda STS, and SVT springs/dampers on my '10 Focus SE.

Car drives and sounds fine......for the most part.
But if I let the rpms rev out to say 4500+, the car will start to resonate and it's more of annoying vibration thru the cabin.

Told my mechanic and he said it's b/c the FSwerks CAI has an aluminum filter and b/c of where it's located you'll notice that vibration a bit.

He said a K/N drop of the same dimension would most likely eliminate it?
I just drove it again and the resonation seems to be decreasing so wonder if this will dissipates as the CAI seats itself.

Anybody else not in the higher rpms with FSwerks or other CAI?


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Old 09-21-2012, 08:14 PM   #2
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Intakes are loud. A new filter will not help. If you want it quiet I would go back to stock. Exhaust's are loud too...probably should keep that stock.

4500rpm is about when those intakes really provide power and it's just the suction side of the engine you are hearing. Nothing is wrong.

Seriously though, a new filter will not help and the mechanic is trying to rip you off.
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Old 09-21-2012, 08:45 PM   #3
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Do NOT swap out the awesome filter that comes with the fswerks for a POS k&N filter.... The mechanic has no clue what he is talking about obviously...
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Old 09-22-2012, 01:55 PM   #4
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i would check to see if its seated on the bushing correctly, Should have LESS noise when higher RPM then Idle, my FSWERKS CAI filter works perfect. no need to replace it, wont make any difference in noise.
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Old 09-22-2012, 02:23 PM   #5
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Thanks for the feedbacke everyone.

Well I don't know what happened but I drove the car another 45 miles or so last night and the resonance is gone. Just the normal increased sound from the intake. Maybe it was an initial seating thing or something. But it's stopped doing it after the first 8 or so miles after the install.

The car defintiely feels like it's got a little more oomph now.....like it :)
The Steeda STS I like but it's still a bit notchy which I'v read on here is common......hopefully it loosens up some in upcoming weeks. But overall I'm happy with it so far.

1.5" drop with SVT springs/dampers didn't hurt ride quality much and car feels tighter around the turns and like the way it sits lower.
Looks kind of lame with stock wheels/tires but I'll probably wear the tires out before spending money on wheel/tire setup.
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Old 09-24-2012, 08:59 AM   #6
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Old 09-24-2012, 10:31 AM   #7
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Originally Posted by homey55 View Post
Intakes are loud. A new filter will not help. If you want it quiet I would go back to stock. Exhaust's are loud too...probably should keep that stock.

4500rpm is about when those intakes really provide power and it's just the suction side of the engine you are hearing. Nothing is wrong.
It's doing it again. And I'm fairly certain this "noise" is not normal. I know intakes are loud and have no problem with the sound the intake makes as I let the rpm's up.....I like it. But above 4500 or so it goes from loud to a tinney grinding vibration sound that I feel at the front of the car and it resonates to the cabin.

It's definitely not a "suction" sound at at all. It sounds like something vibrating against something. It's too the point that I don't want to rev the car past 4500 as the sound is that annoying......
I'm come let my buddy ride with me to have someone else hear it....as he has intakes on his cars.

Then I'm going to go back to the shop and have him take a look and see if something was overlooked.
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Old 09-24-2012, 11:34 AM   #8
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Originally Posted by cbr1100xx View Post
It's doing it again. And I'm fairly certain this "noise" is not normal. I know intakes are loud and have no problem with the sound the intake makes as I let the rpm's up.....I like it. But above 4500 or so it goes from loud to a tinney grinding vibration sound that I feel at the front of the car and it resonates to the cabin.

It's definitely not a "suction" sound at at all. It sounds like something vibrating against something. It's too the point that I don't want to rev the car past 4500 as the sound is that annoying......
I'm come let my buddy ride with me to have someone else hear it....as he has intakes on his cars.

Then I'm going to go back to the shop and have him take a look and see if something was overlooked.
Sounds like the intake pipe is not securely mounted to the car like it should be. Nothing to do with the filter alone could cause the noise you are describing. It is a foam filter... Either the brackets to bolt it to the car are loose or someone dropped something in the throttle body when installing the intake. That is the extent of the possibilites. DO NOT go back to the shop that tried to tell you a new filter would make the noise go away. It almost sounds as if they did something to cause a noise so that you would come back for more service to purchase that new filter then just remove what ever is causing the noise... Some places are just that shady
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Old 09-24-2012, 12:16 PM   #9
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Sounds like the intake pipe is not securely mounted to the car like it should be. Nothing to do with the filter alone could cause the noise you are describing. It is a foam filter... Either the brackets to bolt it to the car are loose or someone dropped something in the throttle body when installing the intake. That is the extent of the possibilites. DO NOT go back to the shop that tried to tell you a new filter would make the noise go away. It almost sounds as if they did something to cause a noise so that you would come back for more service to purchase that new filter then just remove what ever is causing the noise... Some places are just that shady
Thanks for the info. I would agree with you on the shop except I've used this guy before and he's EXTREMELY honest and well respected by just about everyone around here. He put an intake on my Lancer in the past...worked flawless. He's the only person many people will allow to touch their EVO's or AMG Benzes. He's not a BS'er by any means.

I think his suggestion about the filter was just an honest mistake in thinking on his part. But I can tell you, he's not shady at all. He'll look at everything again. In fact if I print out what you think the problem is, he'll gladly accept it and try and fix it as he told me he's totally open to whatever ideas I find ont he forum. If he sees nothing wrong, then I will take it to another shop.

Thanks again.
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Old 09-24-2012, 12:36 PM   #10
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Check your motor mounts. When those go bad the car is almost undrivable due to the noise (personal experience). If that's the case, then you should be good to go. Changing all three mounts should be no more than a 2 hour job.

Sorry about being a smart ass before and I hope I've helped you.
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