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Some pictures.Thx for sharing George!
Im also into making ours 2020 sr+ more quiet.
Im wondering if you could share more pictures of the install, specially on the wheel archs and under the seat. How it looks after.
Yes, very good. I've seen that video before but a very good reminder. I may be buying some of the absorbing materials for behind the plastic wheel well arch liners at some point. It has to be special made for being outdoors and getting wet. I recently bought quite a bit of that noise absorbing material that is designed for inside spaces. I see almost nobody else using it for cars (except for that video you linked). They used to use thin sheets of stuff like that in vintage Cadillacs etc. They now make different types, mostly different thickness, for different noise frequency and different types, shapes etc., for different physical applications. I found it to be extremely effective at absorbing cabin noise! I did a measurement, using a free spectrum analyzer app on my phone, after laying some about all flat areas underneath all glass, roof, front windshield, back glass. That sound absorbing material I had was only up to 2" thick. It really did a good job as it absorbed all the noise well! Except around 75-130 ish hz, it had little effect. And the weird thing is that when I get rid of certain sounds, the others stand out much more. The low frequency now stands out and seems all that remains. Additionally I think that low frequency is the tire vibrations travelling throughout the vehicle through the connecting metal parts. For that low frequency I need much thicker blocks at 4". I've looked at the specifications and ordered some low frequency absorbing blocks of that material at 4". 4" is where that material begins to make a difference at those lower frequencies. The difficulty lies in where to put it so it's not obtrusive. Experimentally I have lined the back deck behind the rear seat in the cabin, below the glass, with 2" thick. It's hardly visually noticeable back there. But even if I put up to 3" thick hardly absorbs that lower end noise around 100 hz. So I have purchased some 4" bass block material specifically made for that lower sound. I have also purchased a 2" thick roll with a black side that I plan to cut to fit for the dash flat part underneath the windshield. I figure 4" would look really silly there. The "extra" pieces that I don't use will go in the inside of the rear wheel wells and front wheel wells. On the insides because that stuff must stay dry. I'll try the 4" block in the rear deck to the extent that I don't block the rear view. Somehow I hope to get some bass block into the cabin, and to the extent that I can much closer the "source" as in the video. Thanks to your video I will give special attention to that vent and get some 4" pieces and some 2" pieces. That should absorb quite a bit. But what I think is happening now is vibration. The vibration is low frequency and comes from the tires on rough asphalt. I feel it in the entire car if I really try. I figure I have smaller chance of stopping all the vibration everywhere without new wheels and tires and better chance absorbing it where I hear it most, inside. That's because the vibration being largely conducted through the metal arms and drive line parts, then conducted through the metal in the entire car, I'd virtually have to sound dampen and sound absorb 100% of the car's materials everywhere. That's not going to happen. I'll keep chipping away at it. But I'm really pleased with how well thicker sound absorbing materials work, such as those pictured in the video you linked. Appreciate your comment and I'll learn from it and make those changes. Thank you.I think one could add padded sound absorbing behind the arch liners?
I see that Audi does this on their etron
Also an interesting video from Mercedes on how they do their sound isolation
I saw I have similar foam blocks on the Wheel wells on my car aswell
BrilliantThx for sharing
I have a tip that might help identifying spots
I recorded the loud noise when driving at highway speeds on rough asphalt
I then use a portable speaker that plays good bass and playback the noise
I then place the speaker on different locations to find where the isolation is leaking
For example I put it on top a tire in the well, and then I sit in the car and try to find where the sound comes from
In the example the sound is loudest just below the small rear window. Seems like that area is not well isolated. Coincidentally
It is where I have two large foam blocks.
Another test was puting the speaker in the trunk.
And the whole rear shelf seemed to leak and resonante. Perhaps where the shelf meets the rear window seems like there is a gap there
Anyway. I think is a good way to isolate the source
Is the foam cover inside the cabin dry space?I just changed to winter tires, here in Sweden we need to change during winter
And those are usually much softer
The car is very quiet now to the point I can hear the motor wine in the highway
the noise that is most noticeable now is the low frequency brumming that seems to come from the chassis, and the wind
I don’t think this noise can be reduced by foam and such? But with deadening material covering the whole wheel arch’s probably.
There is a video where a MY owner got a lot of noise reduction by putting 3 layers of deadening directly on top the metal of the arch’s
After that the MY has a OEM foam cover that reduces noise further. This is missing on the M3
I plan to use the same material, essentially the same manner. However after reading specifications. I need some of the 4" thick Bass Block. Same materials/design, It's just much thicker. I need that to make any real impact in noise down close to 100 hz. The remaining noise, which I think is tires on rough asphalt, I have measured are close to 100 hz, so I need the 4" for that. I will also use various thickness in a number of locations. I've already stuffed foam that I had on hand but this week more of the proper type will arrive and I'll be installing it. Additionally, I just sound dampened the trunk lid. By that I mean the part that opens. I knock tested and it vibrated a lot! Taking the plastic off wasn't difficult. I went after that also because after doing the recorded noise, then playback on a good powerful speaker system, a lot of noise was penetrating the back end from the outside, travelled all the way to the front seat, in spite of all the stuff I've added and the rear seats upright and locked and the trunk lid fully closed. Reducing tire pressure helps reduce that annoying tire vibration noise which I measured near 100 hz, but not enough. Every little bit of progress is good. Also, I've been studying aftermarket shock absorbers. I've read tests where they reported highway vibrations were reduced! And that's my "final frontier". I will likely replace the shocks. I have my eyes on a set of 4 for about $600.Thx for sharing your findings. I’ll will add similar deadening and some fiber ontop the wells aswell
I found some images on how the Mercedes EQC has its isolation. It is perhaps the quietest EV.
View attachment 988515View attachment 988516
There are no shocks at $600 range that would work well to make the ride smoother. Probably better off going with Koni Reds (basically what Tesla is using in the Highland update) or Koni Yellows that are adjustable.I plan to use the same material, essentially the same manner. However after reading specifications. I need some of the 4" thick Bass Block. Same materials/design, It's just much thicker. I need that to make any real impact in noise down close to 100 hz. The remaining noise, which I think is tires on rough asphalt, I have measured are close to 100 hz, so I need the 4" for that. I will also use various thickness in a number of locations. I've already stuffed foam that I had on hand but this week more of the proper type will arrive and I'll be installing it. Additionally, I just sound dampened the trunk lid. By that I mean the part that opens. I knock tested and it vibrated a lot! Taking the plastic off wasn't difficult. I went after that also because after doing the recorded noise, then playback on a good powerful speaker system, a lot of noise was penetrating the back end from the outside, travelled all the way to the front seat, in spite of all the stuff I've added and the rear seats upright and locked and the trunk lid fully closed. Reducing tire pressure helps reduce that annoying tire vibration noise which I measured near 100 hz, but not enough. Every little bit of progress is good. Also, I've been studying aftermarket shock absorbers. I've read tests where they reported highway vibrations were reduced! And that's my "final frontier". I will likely replace the shocks. I have my eyes on a set of 4 for about $600.
There are no shocks at $600 range that would work well to make the ride smoother. Probably better off going with Koni Reds (basically what Tesla is using in the Highland update) or Koni Yellows that are adjustable.
Tein EnduraPro Plus - Review
Hi Folks, I haven't read anything on the forum about these shocks, so I'll post up a review for posterity. Background: my early 2019 M3 SR+ rides like crap. The roads in my area are pretty bad and it just crashes and bounces over road imperfections. It feels like I'm driving a shifter cart on...teslamotorsclub.com
There are no shocks at $600 range that would work well to make the ride smoother. Probably better off going with Koni Reds (basically what Tesla is using in the Highland update) or Koni Yellows that are adjustable.
There are no shocks at $600 range that would work well to make the ride smoother. Probably better off going with Koni Reds (basically what Tesla is using in the Highland update) or Koni Yellows that are adjustable.
Tein EnduraPro Plus - Review
Hi Folks, I haven't read anything on the forum about these shocks, so I'll post up a review for posterity. Background: my early 2019 M3 SR+ rides like crap. The roads in my area are pretty bad and it just crashes and bounces over road imperfections. It feels like I'm driving a shifter cart on...teslamotorsclub.com
I did use your approach and it proved very easy and very helpful.Thx for sharing
I have a tip that might help identifying spots
I recorded the loud noise when driving at highway speeds on rough asphalt
I then use a portable speaker that plays good bass and playback the noise
I then place the speaker on different locations to find where the isolation is leaking
For example I put it on top a tire in the well, and then I sit in the car and try to find where the sound comes from
In the example the sound is loudest just below the small rear window. Seems like that area is not well isolated. Coincidentally
It is where I have two large foam blocks.
Another test was puting the speaker in the trunk.
And the whole rear shelf seemed to leak and resonante. Perhaps where the shelf meets the rear window seems like there is a gap there
Anyway. I think is a good way to isolate the source