Sound deadening

[C350Carl]

Those are pretty much bang on the money for what the carmakers use for damping on body metal.

For absorption of sound under the plastic wheelhouse, you'd need something like carpet.

I’ve heard of people using underlay before. Not sure on the longevity though given the location.

 

[Craiglxviii]

I’ve heard of people using underlay before. Not sure on the longevity though given the location.

The stuff actually used is really scraggy white fibre, almost exactly like a piece of poncho liner if you remember them. Apparently that's good enough to do the job!

 

[Frosty149]

Commercial carpet tiles bitumen backing plus recycled tyres with a nylon fibrous face, warm them up and they are fairly pliable and easy to stick and cut about...
been in use on transits unofficially for years!

 

[umblecumbuz]

So 20mm carpet felt? Have plenty of that recently left over.
Or 20mm carpet foam underlay made from small chunks of dense foam bits all bonded together into sheets (proprietary stuff, but don't know the name)?
Should be messy sticky fun!

 

[nicholas15]

I was referred to a local car restorer by retailer of car sound proofing materials. The car restorers advice was for a S Class(2012) it would cost a lot of money and not make a significant difference.
But would be intereste in your practical results. If I remeber correctly the Maybach has sound isulation panels inside the wheel arches; don't know if hey would fit your S Class or at what price.

 

[umblecumbuz]

End of ... for this car anyway.
It's a Fiat Panda - and it doesn't have plastic whee arch liners! Should've looked first.

So I'll keep the knowledge and apply it to my CLC in due course, although the CLC does not have such a problem with tyre noise.

 

[Craiglxviii]

End of ... for this car anyway.
It's a Fiat Panda - and it doesn't have plastic whee arch liners! Should've looked first.

So I'll keep the knowledge and apply it to my CLC in due course, although the CLC does not have such a problem with tyre noise.

That's OK, even if it doesn't then applying the felt pads to the same relative location on the visible metal wheel wells will do a lot. As will covering the bottom of the spare wheel well with the same stuff.

 

[Craiglxviii]

I was referred to a local car restorer by retailer of car sound proofing materials. The car restorers advice was for a S Class(2012) it would cost a lot of money and not make a significant difference.
But would be intereste in your practical results. If I remeber correctly the Maybach has sound isulation panels inside the wheel arches; don't know if hey would fit your S Class or at what price.

That's due to the reasons already stated above. The S klasse has really, really heavy NVH system already applied, something like 20-22dB average reduction across the vehicle. Trying to reduce down beyond that goes way past diminishing returns!

 

[monkeh]

Plastic wheel arch liners shouldn't be a problem, The 300c, has fabric liners on top of that, not the furry liner like the VRS.
Going back to my project Volvo, I noticed that when I stripped interior to address rust, that there were bitumen/tarry pads put in various places. These seemed to eliminate boom. The 'C' lacked this, especially in the tailgate. Upon reconstruction of the Volvo, I used fibreglass lagging from work. These were in silver heavy duty space blanket pouches. allowing these to be glued to inners of doors. Lighter gauge blankets used in other areas. With the bulkhead, Previous owner had used the roof sheeting bitumen on it to mask a nice area of rust, or cause a nice area of rust. The only noticeable downside to using bitumen based products is when it warms up, You'll get a good few months of a stinking car.
I used 'Dodomat' on some areas on the bulkhead. To hide the sound of the diesel engine? Nope that didn't work. But road noise? Calmed it down in the cabin a lot.