Sound Proofing

[RobertR]

The rear wheel arches and boot are extremely noisy and yaris cross doesn't have a hard plateau that separates the boot from the passenger compartment. If you want to make some deadening, boot Is a good starting point. But you must strip down all the plastic trims in the boot. The double floor is easy to remove, it's only a hard desk and happily, there is 2cm of free space(between bare sheet metal and the second floor) to put some deadening material, I'm going to do that during the oncoming weeks. It will be a noninvasive upgrade. But still, I think it's a waste of time, and no noticeable difference can be achieved because the sound level is subjective.

In the picture, here the green color is free space for at least 2cm of height for sound absorption material.

 

[TonyHSD]

I am not sure that Toyota cars are noisier than some others because of lack of insulation on the car bodies, perhaps type of insulation, suspension bushes and general set up, door seals and interior cards are more of an issue than some sound deadening materials.
There are already people that has tried adding extra pads along the cabin with minimal or no effect at all. But if you are really interested and want to do it that’s fine, just make sure you are using the correct materials for the application placed at the correct spots and they are weather proof too, condensation forms on the inner side of the car body panels on daily basis., and water goes through the windows seals when it’s raining. 👍
 

[RobertR]

VW taigo, polo or skoda karoq are noticeably quieter. It's a combination of deadening material and a car body design, also suspensions design (road noise) etc.
But these wheel arches and boot deadening may help I think because, from the factory, they are just bare metal with just only a little thin carpet on it.

[corradovr6]

20 hours ago, Vins213 said:

My idea is to apply this product on the external wheel arches (https://www.amazon.it/dp/B07ZQQJ1CD/?coliid=I23D88N1FYR7OR&colid=T4DKPE9DR143&psc=1&ref_=lv_ov_lig_dp_it)

This for the inner door panel (https://www.amazon.it/dp/B071RGKWB5/?coliid=I13R7NEZD0E121&colid=T4DKPE9DR143&psc=1&ref_=lv_ov_lig_dp_it) and also some of this product (https://www.amazon.it/dp/B07TKXCN6F/?coliid=I2WIE936HIVK0A&colid=T4DKPE9DR143&psc=1&ref_=lv_ov_lig_dp_it)

 

Are the materials good for the insulation job?

For the roof I have no idea which material to buy, because I wanna thermal and noise insulation

 

for the sealing: I'm using a generic silicone spray (like the yellow cap WD40), but in some plastic joints I put light grease with success (no more crunchy)...my focus now is for the upper front panel (see image), it seems easy to take it apart

The underchassis spray will help with reflected road noise ie bouncing off the road and causing resonance in the chassis. The foam will help to an extent but you would really need to stick a mass layer on it (called mass loaded vinyl). In my corrado I've used some sheets made by tecsound. 

For the roof, i would stick a small piece of damplifier-type material on it to reduce resonance, but the best solution there is to use some dense open cell foam on the headliner, which car resto companies supply. Here, the sound waves are absorbed and converted to low grade heat - nothing that will warm the car though!

The key thing with using a noise blocker, like tecsound, is to ensure there are no gaps that sound can 'leak' through. Its like leaving a door slightly ajar - everything comes through that gap.

Does that help at all?

[Vins213]

5 hours ago, RobertR said:

But you must strip down all the plastic trims in the boot.

no problems about that, I have literally removed all the front and back seats, front and rear bumper for parking sensors...so, I perfectly know the space you described 😃 it's really easy

 

4 hours ago, TonyHSD said:

But if you are really interested and want to do it that’s fine, just make sure you are using the correct materials for the application placed at the correct spots and they are weather proof too

thanks! that's why I shared with you the products I would like to buy...and I'm interested to insulate doors and maybe the roof, but I think it's complicated

the major job will be to 'silence' the upper plank with light grease, cheap solution that lasts over time

 

4 hours ago, RobertR said:

But these wheel arches and boot deadening may help I think because, from the factory, they are just bare metal with just only a little thin carpet on it.

true

 

3 hours ago, corradovr6 said:

The underchassis spray will help with reflected road noise ie bouncing off the road and causing resonance in the chassis. The foam will help to an extent but you would really need to stick a mass layer on it (called mass loaded vinyl). In my corrado I've used some sheets made by tecsound. 

For the roof, i would stick a small piece of damplifier-type material on it to reduce resonance, but the best solution there is to use some dense open cell foam on the headliner, which car resto companies supply. Here, the sound waves are absorbed and converted to low grade heat - nothing that will warm the car though!

The key thing with using a noise blocker, like tecsound, is to ensure there are no gaps that sound can 'leak' through. Its like leaving a door slightly ajar - everything comes through that gap.

Does that help at all?

Thanks! So I have to remove all the 'doors' inside the panel

could you link me some products to buy? Thank you!

 

the idea is to apply products on the doors panel (metal and plastic panels), wheel arches, trunk and maybe roof/hood...for the wheel arches I think I need a particular paint

and then, as I said before, I have to quiet the upper dashboard

[RobertR]

on my previous car, e92 bmw, there was soundproofing mat everywhere, it was hard to find any bare metal under the plastic trim, especially in large areas. It was something like jute feltwool, no fancy neoprene or 3 layers of space material that cost 15$ per A3 sheet. But still, yaris will be always on the noisy side.

I try something to do with the back of the car, because this looks easy to work on with plenty of space for deadening material and during stable traveling speeds on EV drive, major noise coming from the back, I think. I give it a chance.

[TonyHSD]

Latest Toyota cars has very thin and flimsy boot parcel cover that doesn’t help at all with sound insulation. A lot of road noise entering the car from behind, and even when you have your rear seats folded you can hear a lot more noise. Also back seat hand reset solution in Yaris cross its not a smartest thing because if you use this you literally has no sound barrier between rear seats and boot area. If you want to sound proof your Yaris cross at this particular point you can design and build custom boot parcel cover that is lightweight and with soft texture both sides and seal nicely the boot area rear seat and hatch door, Like in Corolla hatchback or Auris. Add this rubber back seat covers that are optional and you are good to go. This sound proof stick on pads no need to be placed on each and every bare metal sheet on the car body, it’s more complicated than that. There is acoustic software that needs to be used or consult with acoustic specialist that can pinpoint where you need to have them placed otherwise it will be only money spent but no noise reduction. If you watch Munroe live YouTube series when they talk about “Body in white “ within the car construction they mentioned exactly that. 👍 
Toyota mostly has doors seals and the doors themselves that let air and noise in while at speeds. Also the door window frames has a tendency to flex while at speeds and let air and noise inside the cabin, been mentioned in Yaris mo4 and some Corolla that at 60mph the car sounds like side windows been left slightly open, well this is it. Again Munro live. 

[RobertR]

You are right tony. It's the same as on our TVs, normal volume is for me around 20 from 100. But sometime in the evening or when you reading something it's too loud and I put it down to 10 and it's seems to reduce "noise" from the tv significantly, but after I while subjectively, the noise is almost the same as it was when tv was set to 20 and I'm reducing volume level even more. My point is, our noise perception is very adaptive and if you achieve a 3dB drop in your interior, it's basically nothing and your ears very quickly adapt to this level of noise and brain will sense this as the same, what is not the same is the spectrum of that noise. It will be more to the low frequencies and those frek. are more tolerable.

[Vins213]

On 2/9/2023 at 3:08 PM, TonyHSD said:

Latest Toyota cars has very thin and flimsy boot parcel cover that doesn’t help at all with sound insulation. A lot of road noise entering the car from behind, and even when you have your rear seats folded you can hear a lot more noise. Also back seat hand reset solution in Yaris cross its not a smartest thing because if you use this you literally has no sound barrier between rear seats and boot area. If you want to sound proof your Yaris cross at this particular point you can design and build custom boot parcel cover that is lightweight and with soft texture both sides and seal nicely the boot area rear seat and hatch door, Like in Corolla hatchback or Auris. Add this rubber back seat covers that are optional and you are good to go. This sound proof stick on pads no need to be placed on each and every bare metal sheet on the car body, it’s more complicated than that. There is acoustic software that needs to be used or consult with acoustic specialist that can pinpoint where you need to have them placed otherwise it will be only money spent but no noise reduction. If you watch Munroe live YouTube series when they talk about “Body in white “ within the car construction they mentioned exactly that. 👍 
Toyota mostly has doors seals and the doors themselves that let air and noise in while at speeds. Also the door window frames has a tendency to flex while at speeds and let air and noise inside the cabin, been mentioned in Yaris mo4 and some Corolla that at 60mph the car sounds like side windows been left slightly open, well this is it. Again Munro live. 

Thanks Tony! I have a 3gen Yaris, not the cross one 🙂 I can build a custom boot cover or also I can apply acoustic sheets, that's not a problem, easy job

I think that soundproofing the doors is also a good job for my ears

[anchorman]

On 2/9/2023 at 7:19 AM, RobertR said:

The rear wheel arches and boot are extremely noisy and yaris cross doesn't have a hard plateau that separates the boot from the passenger compartment. If you want to make some deadening, boot Is a good starting point. But you must strip down all the plastic trims in the boot. The double floor is easy to remove, it's only a hard desk and happily, there is 2cm of free space(between bare sheet metal and the second floor) to put some deadening material, I'm going to do that during the oncoming weeks. It will be a noninvasive upgrade. But still, I think it's a waste of time, and no noticeable difference can be achieved because the sound level is subjective.

In the picture, here the green color is free space for at least 2cm of height for sound absorption material.

 

Mine's not quite like that being AWD but there is the accessory filler available.