Covered easy to access areas with sound absorbers.

Added some more, there was already white soft ”pillows” on some plastic.

 

Thanks for the tips! I had some Noico butyl mats and some closed cell neoprene I use for computer cases. I slapped some behind the battery, along the wheel well and in the spare tire well. Large volumes with bare metal walls tend to be bad for resonances and vibrations, so I figured the damping of the mat itself and the 2 layers of sound absorption should help a little. Honestly I find the R4P relatively quiet already and I didn't take a road trip beforehand so I won't be able to compare before and after.

I also put down some old carpet mats from my Highlander under the OEM rubber weather mats on the passenger side and in the back seat. I could not get two mats anchored properly on the driver side and did not want any risk of the carpet mat slipping up into the accelerator pedal. So, I just added some leftovers of my 2-layer butyl/neoprene to the bottom of the OEM mat at the top left side by the footrest area where there is no OEM floor carpet.

 

Some results, there is less
road noise coming from the rear now.

I also added stock textile floor mats under the rubber mats, something i read on a Subaru forum, and this further improved the road noise.

I estimated that i could go 35-40mph with the same noise level as 25mpg before adding anything, so definately an improvement.

I’m on Bridgestone Alenza 001 235/55/R19, they ate louder than my friction winter tires, Continental Viking Contact 7 225/60/R18. But i think the rubber is to hard because it is only 37 farenheit today.

 

Isn't it already quiet enough?

 

When the tarmac is smooth it is, but we have rough surface for added friction.

 

OK so I’m gonna add some more isolation.

First of is the trunk.

Very thin metal, notice access holes goes straight into some shield which sits in open air..

What brand of deadner are you using?

 

What brand of deadner are you using?

Silent Coat, a UK based supplier.

You can probably just get any of the ones available in the USA. Husmat, Fatmat, Noico or Dynamat.

 

Update, I have installed these door protectors, main purpose is to keep the inside of the vehicle clean.

However, these really do reduce road noise, a significant upgrade.

I have had them for one week now could not be happier.

 

Where did you get them and cost???

 

I found these on Amazon US: Fender Flares Black Rear Splash Guards. Pricey at $90.

 

Is there an OEM solution?
I haven't neen able to locate any parts for it

Thanks

 

Deleted due to shipping cost.

 

My only gripe on ordering from China is that it can take months for it to arrive.

 

I ordered from China / Alienexpress, I paid 40 USD + customs fee locally in Sweden.

It took 5 weeks for the package to arrive eventhough it said ”air mail” on the box.

The box was mangled and looked like it had traveled through an asteroid belt, but inside everything was in mint condition..

Well worth the wait, IMO I would have bought them again even for 300 USD.

 

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Agree on the long time frame.

 

$32 shipping?

Not much cheaper than amazon after.

 

That hole you covered was to let pressure out of the cabin when you shut the doors, I'd tape some thick felt or something that could breath over it.

 

There was a rubber cover for the hole but I removed it to take the foto. The rubber cover is there now, but probably under some noise reduction material.

Do you think I need to do something about it?

 

Cheaper solution:

 

LOL true, but they not only reduce the noise floor but also everything else, like people, the JBL stereo, emergency vehicles... Plus they itch after a while. And they would take away the fun of modding the new car... Three strikes!

 

I added these on the inside of the doors. Between the interior and the inner metal.

It took out the last of the road noise. Super quiet at 65MPH [emoji106][emoji2958]

 

What is it?

 

Just came back from a roadtrip, omg it is superawesome now, so comfortable.

Highly recommend this!!

 

What specifically are you recommending? all the mods you detail or one specifically?

 

I did the sound deadening material ( Hush Mat ) all 4 doors when replacing the speakers. Definitely makes a difference with some noise reduction. I did it to enhance the quality of the stereo, which it did, but noise reduction was an added benefit. To do the whole car would probably add quite a bit of weight. Time consuming for sure, 2 to 3 hours per door to do the inner and outer surfaces.

 

I added two layers in the bottom of the door;
First one of those silver rubber that goes on the sheet metal, and on top an isolator foam layer.

This made a dramatic change, most significant yet I believe!!!

 

I’ll be going on this sound deadening journey soon. It’s pretty annoying the amount of road and wind noise but I understand that this is a lower budget vehicle (RAV4) with a very expensive drivetrain. Both of the Lexus GX’s I have/had are miles and away quieter. Especially the GX470, it was like a bank vault. Solid and quiet.

 

I don’t find the road or wind noise offensive, but the ICE itself is incredibly coarse. Worst sounding 4 cylinder gas engine I have ever owned. Wish there was some way to refine the engine/exhaust sound, which to me is grating and amazingly bad. It’s hard to think of another small engine, other than a cold diesel, that compares. Since the hood already has material on it, don’t know what I can do. Different mufflers? Firewall?

 

I only just realized they made the door part of the rear wheel well... That just seems like such a bad idea with how much spray the wheels can cause. Never seen that before.

 

I’m gonna add a thicker isolator, it is very nice to drive now even at 64mph.

 

Wow, that’s insane.

 

Lexus IS 500, notice the extra weatherstrip in the middle!

 

Hmmm, thinking we can duplicate that on our Primes pretty easily. I hope to begin my sound proofing journey this spring or early summer before out annual summer road trip out west.

 

Added 10mm isolation all the way along the door as an extra barrier. And 20mm that sits against the chassis at the A/B pillar. Big improvment.

67dB at 100km/h now, if anyone wants to measure it would be great.

 

Added more in the trunk and rear wheel well, the ones inside the trunk.

Got a 2db drop at 100km/h.

 

Added more in the trunk and rear wheel well, the ones inside the trunk.

Got a 2db drop at 100km/h. ( 3db is half the percieved sound volyme, so pretty good [emoji106])

3 db is half the sound power. 10 db is half the perceived sound level. Still, 2 db is good, given that you are working on a bunch of different fixes.

I'm surprised at how many people hate the engine noise. I barely even notice it, unless I'm really pushing it. Eh, maybe I'm just a slowpoke, who knows. But it's seldom loud.

 

I was just going to ask for dB decrease and @Torque delivered - thanks. It would be great to know what solution produces the greatest decibel decrease for the least amount of money and time invested.

 

I was just going to ask for dB decrease and @Torque delivered - thanks. It would be great to know what solution produces the greatest decibel decrease for the least amount of money and time invested.

Hi. The lower door isolation at post #33 is likely the most drop vs time invested. (What is the point of messing with inside of doors, when noise can enter straight from below [emoji3596])

Also, unfortunately I do not have db readings for stock.

The first db readings includes;
1. trunk
2. front of rear wheel wells, inside cabin
3. plastic door protectors
4. foam isolator in all 4 doors.
5. summer mats and rubber mats
6. #33 isolation and isolation all the way around doors #47.

The new reading adds rear wheel wells inside trunk area, which gave 2db at 100 and approx 1db at 55

Measurements are on semi-bad tarmac

Its way quieter than stock now, maybe 5-6db


Ordered by ease of install;
37
47
fender protectors
trunk
doors
rear wheel well cargo
rear wheel well cabin ( removal of rear seat )

 

Thanks much for all your posts @Torque, especially #51 because it's super helpful. I need to stop telling my significant other no more upgrades because this thread forum is getting me in trouble.

As far as the folks having issues with the HV engine noise, for me it's not as much about the extra decibels but instead the HV's "roughness" compared to the EV. I guess we're a little spoiled with the EV's quiet and raw power so when the HV kicks in it's like the Tale of Two Cities. OK maybe that's a little melodramatic!

 

Wanted to do a little noise reduction on my 2023 XSE. Made before and after sound measurements, and thought that I would share them here. The ground rules were that the work had to be simple, and my wife said that the results had to be invisible. I took some old carpet mats from a previous vehicle, cut them to fit, and placed them under the all weather mats in the seating areas. I then put Second Skin Damplifier Pro 2mm sound deadening mats in the cargo area under and around where the spare tire is, as well as on the panel next to the 12 V battery. It took almost 10 square feet of material.

Sound level measurements were made for three situations: EV mode at 40 mph and at 55 mph, and HV mode at 70 mph. The 40 mph measurements were made on a tertiary road, the 55 mph measurements were made on a smooth secondary road, and the 70 mph were made on an Interstate highway.

At 40 mph and EV mode, the improvement was only a fraction of a dBA. It was below the uncertainty in the measurements.

At 55 mph and EV mode, and at 70 mph and HV mode, the improvement was about 3 dBA.

So the measured noise reduction was not that great, but the character of the noise changed. I find it hard to describe in words, but it seemed a little less harsh, or maybe a little less edgy. Whether it was worth the cost, both in money and in time and effort, is questionable, but it was an interesting exercise.