Sound insulation

[Reckless_2k]

I like almost everything about the F80 M3 Competition, the looks, the amazing handling and performance. One thing I can't stand is the tyre noise on bad UK roads.

Is there anything that can be done to reduce this without changing the wheel size?

Has anyone insulated their car with products like dynomat? If so, how were the results?

Please no answers like 'Buy a Lexus/Non M 3 series/G80/Audi', 'not the car for you'.

[SteveYem]

Which wheel diameter are you using?

[alex2364]

Didn't you already make a similar thread about this? https://f80.bimmerpost.com/forums/sh....php?t=2118025

I would change your tires first, maybe one that is more comfort oriented than performance like an all season tire. Also, make sure what you're hearing is tire noise, and not engine or exhaust noise.

[Reckless_2k]

Originally Posted by alex2364

Didn't you already make a similar thread about this? https://f80.bimmerpost.com/forums/sh....php?t=2118025

I would change your tires first, maybe one that is more comfort oriented than performance like an all season tire. Also, make sure what you're hearing is tire noise, and not engine or exhaust noise.

Yes I did but as someone in another thread said they changed their tyres and the noise was still bad.

It's definitely tyre noise, on smooth roads the car is quiet enough. I find the car engine to be pretty much silent in efficient mode.

[ibimmer954]

Tires in the class called “Grand Touring” are supposed to be about comfort and quiet operation. But remember the bushings and body in the M3 are designed with performance in mind. So there’s only so much you can do. How about a nice 540i? 😉

[Nyc911]

I added sound deadening to the trunk floor, under back seat and the doors… made a big difference in the CS but I don’t think the CS comes with a lot of sound deadening but it it substantially quieter than before. With less than 20lbs added

[Reckless_2k]

Originally Posted by Nyc911

I added sound deadening to the trunk floor, under back seat and the doors… made a big difference in the CS but I don’t think the CS comes with a lot of sound deadening but it it substantially quieter than before. With less than 20lbs added

That's good to hear. I think the competition is similar to the CS with the lack of sound deadening.

[Reckless_2k]

Originally Posted by ibimmer954

Tires in the class called “Grand Touring” are supposed to be about comfort and quiet operation. But remember the bushings and body in the M3 are designed with performance in mind. So there’s only so much you can do. How about a nice 540i? 😉

With a second kid on the way a 540i is definitely the sensible option.

I'd like an M3 for a year and then maybe chop it in for a 530/540i.

[starbai]

Originally Posted by Nyc911

I added sound deadening to the trunk floor, under back seat and the doors… made a big difference in the CS but I don’t think the CS comes with a lot of sound deadening but it it substantially quieter than before. With less than 20lbs added

What sort of sound deadening materials did you use? Traditional dynamat I have learned is more to help with vibrations/resonance rather than 'quieting' the interior. But I'm only on the first stage of educating myself here. Appreciate your thoughts/experience.

[Reckless_2k]

Originally Posted by starbai

What sort of sound deadening materials did you use? Traditional dynamat I have learned is more to help with vibrations/resonance rather than 'quieting' the interior. But I'm only on the first stage of educating myself here. Appreciate your thoughts/experience.

I'm curious to know as well. I've heard the same about Dynomat but then others have said it made a big difference.

[phyzzo]

Different tires can make all the difference. I find the Michelin PS4S makes a loud, resonating cabin noise in the F80 on some highway surfaces that my Pilot Alpin and my Cup 2's do not.

[starbai]

Originally Posted by Reckless_2k

I'm curious to know as well. I've heard the same about Dynomat but then others have said it made a big difference.

I've dynamatted entire cars I've owned in the past. Including my last S2000. I never expected a convertible roadster to be a bank vault but I wanted to remove some of the road noise when the top was up on the highway.

It did make a big difference in the quality of the sound system, and eliminated all the rattles from the one small 10" sub I had in the trunk. But, it did nothing to keep 'road' noise down. I never did figure out if that was solely due to it being a soft top roadster, or if it was because the dynamat wasn't expected to do that work.

[Reckless_2k]

Originally Posted by starbai

I've dynamatted entire cars I've owned in the past. Including my last S2000. I never expected a convertible roadster to be a bank vault but I wanted to remove some of the road noise when the top was up on the highway.

It did make a big difference in the quality of the sound system, and eliminated all the rattles from the one small 10" sub I had in the trunk. But, it did nothing to keep 'road' noise down. I never did figure out if that was solely due to it being a soft top roadster, or if it was because the dynamat wasn't expected to do that work.

Did it make any difference to the road noise in your other cars that you applied it in?

There are mixed reviews out there.

Someone on the M3 cutters forum said he just applied it to the boot and rear wheel arches and it made a big difference.

[M3SQRD]

Originally Posted by starbai

I've dynamatted entire cars I've owned in the past. Including my last S2000. I never expected a convertible roadster to be a bank vault but I wanted to remove some of the road noise when the top was up on the highway.

It did make a big difference in the quality of the sound system, and eliminated all the rattles from the one small 10" sub I had in the trunk. But, it did nothing to keep 'road' noise down. I never did figure out if that was solely due to it being a soft top roadster, or if it was because the dynamat wasn't expected to do that work.

Dynamat is used specifically to damp NVH on the surface it is directly mounted on. It does not reduce sound/acoustic transmission through it and the surface it is mounted on.

I had an ‘05 s2000 with a Mugen hardtop and I found the interior to be very quiet. It’s probably the noise transmission through the soft top which wasn’t affected by the dynamat you installed.

[Reckless_2k]

He had good results.

[theweebabySeamus]

Tempted to try some Luxury Liner Pro under the wheel liners and see if there's much difference.