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Old 08-22-2009, 03:43 PM   #1
Vince F
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2007 Imp 2.5i 5M Wgn
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Default Tire Noise

The tire noise from the Bridgestones was really starting to bother me, and always did, so decided to get after It. I added undercoat to the wheel wells, and under the tire well. Slipped some thin foam padding around the sides under the carpet, and put carpet padding under the rubber mat in the rear of the wagon. The noise from the front became more noticable, and started putting carpet padding under the carpet against the firewall, and behind the kick panels, but it sounded like noise was coming through the side windows or door. Didn't feel like dynamatting the doors. Had enough problems with the door locks when I took off one door card to add factory tweeters. Then I found out I could pop the speaker grills, and connect them. I didn't have the brackets so glued them to the back of the grills. Couldn't imagine the noise was coming from the outside of the car Through the door and or glass.

Saw a gap between the front fender and the frame where the hinges are that led to the front wheel openings, and wondered if the sound from the doors was transmitting into the doors from the side. I picked up some Noodles, the 4' long plastic foam tubes that are a kids toy thing, and filled the gap behind the wheel liners. That didn't do as much as I hoped. Started searching for cures and came across patents for tire tread designs that generated less noise, and found some fairly complicated info. One thing that struck me was that the curved tire shape forms a horn with the road surface. Having designed and built horn loaded loudspeakers, I tried to figure how to defeat the acoustic aplification a horn creates. Not easy with a tire in a wheel well. The patents talked about creating a pitch sequence that distributes the noise over different frequencies, so it doesn't have peaks in one or fewer. When the weight of the car is on the tire where it contacts the ground, it compresses the air on the grooves, and when the weight is off the tread, the pressure is released, vibrating the air, and the horn shape amplifies it. The info is pretty complicated talking about pitch sequence, which I take to mean the length of the grooves around the tire, and breaking it up into smaller sections generates different frequencies, and spreads the noise over different ones, so it is less noticable.

I planned to glue rubber pieces in the grooves to, and was looking for what to use, and the pitch lengths of the grooves is mighty complicated, so decided to put blobs of rubber cement here and there in the grooves, to see what it did. Wondered if I could make the noise worse, but doubted it. I have only done the front tires because the reare are hard to get to the tread, but am going to rotate the tires soon, and will do them then, and there is little noise coming from the rear now. The noise was severley reduced, and I can hardly hear any difference driving on different road surfaces, and before I was confused, since what looked like asphalt was louder than concrete, but in the daytime noticed it was mecadem, asphalt with stones in it.

I'm going to keep doing easy things to get it as quiet as I can. Going to change the front seats, so will get under the carpet more. Sube just puts fluffy insulation on the bottom of the floor, and not the verticle surfaces, which has to help some.
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Old 08-22-2009, 04:42 PM   #2
Vince F
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Old 08-22-2009, 05:56 PM   #3
Uncle Scotty
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making SURE that the alignment is done right is the supreme key to tire noise

you MUST make SURE that toe is set to '0' as in Z E R O

not 'in the green'....not almost....not 'its fine'

Z E R O
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Old 08-22-2009, 07:44 PM   #4
Vince F
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since what I did to the tread grooves, is said to break up the sound a tread creates, I would believe it was the design, but I'll have the alignment checked after I rotate the tires, and see what it sounds like with the untreated rear tires on the front. I was going to add the rear camber bolts to increase the camber.
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Old 08-22-2009, 09:53 PM   #5
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once tires have become noisy due to wear, it wont help the noise to change the alignment

the wear on the tire is causing the noise and new tires and an alighment will make the issue much less of an issue
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Old 08-22-2009, 10:00 PM   #6
Vince F
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the car/tires have 7K mi on them. I wasn't going to buy different tires to Try to quiet the noise, and won't now either.
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Old 08-22-2009, 11:43 PM   #7
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Quote:
Originally Posted by Vince F View Post
the car/tires have 7K mi on them. I wasn't going to buy different tires to Try to quiet the noise, and won't now either.
then yer pissing in the wind
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Old 08-23-2009, 12:10 AM   #8
Vince F
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as long as I can't Hear it.

When I perceive a problem I fix it, and the only one I perceive is noise, and I am fixing it.. If the problem was alignment, what I did wouldn't have fixed it the most, and it Does fix air pumping.
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Old 08-23-2009, 12:19 AM   #9
Uncle Scotty
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Quote:
Originally Posted by Vince F View Post
as long as I can't Hear it.

When I perceive a problem I fix it, and the only one I perceive is noise, and I am fixing it.. If the problem was alignment, what I did wouldn't have fixed it the most, and it Does fix air pumping.
yer outa yer mind
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Old 08-23-2009, 01:14 AM   #10
Vince F
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I though you were. Must be the Other Scoty.)))

Well, at least MY car is quieter with a few $ in materials. What did Yours cost, a few hundred?
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