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Discussion Starter · #1 · (Edited)
The IQ is Smart but Noisy, it is a small car that feel's bigger than it is, It has a bigger car ride, Two pluses in the IQ's favor, BUT!!, it still has the small car Noise!!

My goal is to make the IQ CONSIDERABLY QUIETER than it comes from the factory.

When i bought my IQ, I noticed it was Noisy in a few areas!

I have heard that the sound/noise is possibly three areas,
1. Engine drone into the cabin, or is it
2. Exhaust sound into the cabin, or is it
3. CVT Sound into the cabin

4. The Next sound is caused from Not enough Sound deadner/Undercoating in the inner fender, and any rocks that are thrown up into the fender make a loud noise, like someone is shooting an AK47 at you.

In driving My IQ since Dec 2012,

Well I have kinda become accustom to the noise, I have gotten used to it, (NOOOOO!!!!) and maybe even talked myself into it being a sporty sound, But I dont want to.

I want to reduce the interior sound level.

I was on the freeway and the road was not real smooth, at 65mph it was loud.

I live up in the hills/mountains, and in a slightly snowy area at times, where they put down small rock/gravel to provide traction around turn if it gets icy.

Those little rocks also make the interior of the IQ Noisy in through the wheel wells.

So I am going to start a noise reduction program on my IQ.

Here is my plan.

I would like to take pictures and post the progress & cost.

1. Spray Undercoat into all 4 of the fenders, Undercoat is a rubberized spray coating that comes in an aerosol. Mask off painted exterior of fender, this should really reduce the amount of noise that is transmitted into the interior of the car through the wheel wells, This may also be sprayed on to other places under the car to reduce other noises, possibly around/under the exhaust system.

2. Engine Noise, In an effort to reduce the impeding sound transferred into the interior from the engine, I will install a peal and stick sound deadener to the firewall, and as far back as i can go inside the engine compartment and under the car.

3. I would also like to lift the carpeting inside of the car and add this same peal & stick sound deadner under the carpeting, on the entire flooring of the IQ, at least 2-3 layers thick in a crossing pattern.
This should be done under all the carpeting meaning the whole interior floor of the car. It would also be nice to get the inside of the doors.

I have used this on other cars with great success.

You would be surprised how much of a difference this can make.

I at this point will test drive the IQ and determine if it is adequate,

3. I may also look to the exhaust, maybe either extending the exhaust pipe out the back of the car so that the exhaust sound does not get trapped under the car, but can get all the way out the back.

I am going to be going on a 2K mile drive in the IQ soon, from Southern Oregon to Southern California, and back.

I would like to do a Db check before & after unfortunately I do not have the equipment for that.

My goal is to make the IQ CONSIDERABLY QUIETER than it comes from the factory.
 

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I've had a 2004 Toyota Echo Hatchback, 2008 smart, 2005 Scion xA, 2010 Honda Fit, and all were equal or noisier than the iQ. I don't find it bad at all. With the smart, it was a bit noisy, and I did Dynamat inside, on the engine firewall and floors. Helped.
 

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Discussion Starter · #3 · (Edited)
Undercoating: is a Rubberized spray on aerosol that can be sprayed on in a relatively quick time frame and as thick as desired, the thicker applied the better sound proofing you will have.

Preparation:
1. Wash area to be undercoated with soap & water before application of spray on Undercoating.
then a
2. Wax & Tar Remover (Rust-o-leum makes a good one) should be spray on to clean the area of wax & release agents and road dirt.

Application:
Undercoating comes in a High pressure Aerosol spray can that sprayed on as thick as you want in a matter of minutes, there is no/to very little drying time between coats, but after the desired amount/thickness has been sprayed on, it usually takes at least 4 hours to dry, But you really should let it dry overnight.

3. Spray on Undercoating in sweeping passes like spray painting, to desired thickness.

As far as Undercoating Manufacturers, there are several,
1. Rust-o-leum,
2. Duplicolor, &
3. 3M

I will mask off all painted areas and will use painters drop cloths taped to the inside edge of the fender so that no Undercoating will get on any painted surfaces.

I may even wax my IQ before I apply this coating as it will not stick to a waxed surface, just in case.
 

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Discussion Starter · #4 · (Edited)
Hey Dave777,

I have done the dyna, & fat mat, to other V8 cars & Trucks as well as a couple of mid engine Porsche's, I have also used the roof sound proofing that they have at home depot/lowes and it works well and is inexpensive.

by all means if it is tolerable then dont worry about it. For me on the freeway especially on a bad stretch of freeway but they are mostly bad stretches of freeway at 65mph it can wear on you, or just trying to clearly hear the stereo at times was a little difficult.

Since there is No undercoating to very little, in the fenders you can hear any of the tiny pebble's that Crash into the inner fender, and when there are many of them, this can be very annoying, but can be fixed very inexpensively & very little time.

I will go forward and post what changes have taken place.

I plan on putting on a lot of miles on my IQ and want those miles to be as comfortable as possible.
 

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Discussion Starter · #7 · (Edited)
Hey iQtuner,

Lets us know how yours turns out, and if it is a small or big difference.

I have to say that the IQ is relatively quiet for what it is, I think it could be much better.

The Inner fender Noise is loud and unacceptable, in looking in the inner fender there is a plastic section toward the rear of the inner fender, that has no coating on it at all, that when the rocks hit it make a rather loud noise.

There is not much to very little Undercoating in the inner fender.

I picked up some Rubberized Undercoating and a few Plastic Drop cloths, again I am going to tape them to the inside of the fender just past the rolled edge of the fender, and have the Wife hold the drop cloth up tight that way it will protect the rest of the car from any over spray while I spray the inner fender.

I will be Jacking up the IQ so that I can get/see under it. I am sure there are other areas that could benefit from adding some under coating, in strategic areas, to limit impeding decibels.

I would like to reduce either the engine drone or the exhaust sound or which ever it may be, or both.

One thing it says on coating with undercoat, DO NOT GET IT ON YOU EXHAUST SYSTEM. You can either wrap it in alum. Foil, or shield it some how(cardboard box) while spraying under coat.

When i bought my wife Rav4 we had Toyota undercoat it, it made a difference.
 

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I haven't heard a lot of people mentioning the Scion iQ being a noisy car. On a couple test iQ test drives I went on I did notice it was a bit noisier than others cars I've driven but thought it was "normal" for the iQ. Once i get an iQ, I plan to upgrade the audio maybe i should add dynamat the same time to reduce the noises.
 

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iQ noise doesn't bother me either....maybe I've just driven lots of noisy cars and, as mentioned, I have not heard it noted much as a drawback. Still, to each their own....sounds like a fascinating project!!
 

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iQ noise doesn't bother me either....maybe I've just driven lots of noisy cars and, as mentioned, I have not heard it noted much as a drawback. Still, to each their own....sounds like a fascinating project!!
I can see how someone coming from a luxury vehicle will say the iQ is noisy but i've driven your typical imports and older luxury vehicles so I guess I got use to the noisiness lol. Next time i'm in the iQ and driving, i'll pay close attention to the noises, maybe then i'll notice it more.
 

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nicely said gokartride,im in the same boat,and if one choses to do so,even the stock base pioneer system sounds damn good with endless volume,especially when one gets into it and figures out ALL the audio features,there are many.
 

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Discussion Starter · #15 ·
I think the IQ Noise that bothers me is the:

1. Sound of the rocks hitting the inner fender at any speed.
2. Freeway speeds, there is a bit too much drone.

I do not mind the city driving sound level but here to less is more.
 
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