Soundproofing

[jellyfishfields]

The joys of getting older I suppose, but the new car is winding up my tinnitus quite a bit.

I've been speaking with Richard from Turbo Thomas exhausts to see what can be done from his side, but I was also wondering about soundproofing.

Most of the soundproofing has been removed from the car for weight. It does seem a shame to being adding some weight back in, but if it means the car is more enjoyable then I'm happy to do it.

Does anyone have any experience with this? If it is worth doing, am I best to buy pre cut kits from the likes of Lakefield/Design 911, or should I just buy and cut to size myself?

[911hillclimber]

Been there, done that in my 73T.
Years ago stripped the bulk of the factory bitumen type sound sheeting out of the cabin, back seat etc inc the heavy dense moulding that is behind the rear seats and bulk head..
This was to remove weight for hillclimbing.

When I retired the car 20 years ago I put fresh sheeting back in to make the car more 'touring pleasant'.
Bought a lot of A4 sized sheeting (about 2.5mm thick), with aluminium top cover, ultra sticky backing and a hand roller about 50mm wide.
Set to and lined the entire cabin using the roller to force the sheeting into all nooks and crannies. Sure saves your fingers! A hot air gun is a good tool also.
A few gaps here and there will not be a problem.

Left the dense moulding out and did not replace the sheeting inside the top of the engine bay which I wish I had replaced.

Stuck the carpet sections back in onto the alum face of the sheeting.
You realise how heavy it all is when doing this.

The harshness has gone, but the car is no limo, and no early car is!
Well worth doing, the weight is lost and the car far nicer and I can talk to the wife an no SHOUTING required....

Did this before I needed hearing aids, but now with the aids the car seems the same to me despite much sharper hearing where I notice rattles and wind noise more.

All in all about a lazy day to strip the interior, roll the sheeting on and glue back carpet and re fit the seats.

I bought my sheets off ebay. Maybe the Dynamat product is better, not sure, but I'm ok with my result.

Hope this helps.

[rhd racer]

When I replaced the interior and carpets on the 964 I used Dynomat throughout the interior - pans, shelf, tunnel and inside the doors. Partly to bass dampen but also to make a nice place to be.

With the stereo off and windows up, my super loud exhaust sounds like that of my daily inside - it really is that effective


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[sladey]

From memory this is quite a science. A lot of people just stick a load of dynamat or similar and call it done - especially in the hot rod world.

I think that helps with resonance - I.e. stops your body panels working like speakers. I have done this.

However I understand there are a few different levels of frequencies (I’m writing this all from memory)

I believe as well as loading up the panels you have the fluffy lambs wool type stuff which deadens another frequency and then over that you have what looking like a thick black seat-shaped covering. My understanding is that this part needs to seal fully all round as the combination of that and the wool stops a lot of noise coming forward from the engine.

I’ve lost a load of my thick black covering when replacing the interior (but I have put dynamat in). I’d like to revisit mine and reinstate the original type stuff - but I spoke to Gary who says he did all that and it made little difference.

I know Singer had experts in with sound meters working out scientifically what to place where and from memory of a film where they showed that it was a combination of materials to get the right effect - much like the OEM approach

HTH

[Gary71]

I did all mine with various materials and to be honest now just use noise cancelling headphones on a long drive

You can take the edges off for sure, but no more than that

[rhd racer]

I def didn’t do any calcs Mark - gobbed it on everywhere and got lucky!


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[BILLY BEAN]

Tinnitus is something I cope with. My solution on long journeys is a pair of ear defenders.

[sladey]

I also use noise cancelling headphones on motorway journeys. On the recent Spain tour I actually wore them all the time - even when making like a sanitary towel and “pressing on” - was still surprisingly workable.

Would still prefer usable sound levels though

[hot66]

But also remember last year one of our group got fined 100 euros by the Spanish police for having airpods in whist driving

[jellyfishfields]

Thanks for all the advice so far, very much appreciated.

I’ve emailed a few suppliers, hopefully get some replies tomorrow.

Richard from TT exhausts has also given me a couple of options, but I think I’ll fit the soundproofing first and see how much difference it makes.

I’d hate to make the exhaust quieter if I don’t have to

[Jonny Hart]

Another tinnitus sufferer here. Exhaust is one thing to solve ( I recently returned my 993 silencers to stock as the sports ones were driving me potty ).

Another things is wind noise/buffet and the associated shouting with passengers (plus radio being on louder) from having the window open at higher speeds. In my SC, Since I've had the A/C, In summer, I can close the windows on the motorway which offers a much less hectic environment for dodgy old ears.

[jellyfishfields]

Just to conclude this, I fitted the soundproofing a few weeks back.

Always good to see such a solid floor and no surprises after taking the seats and carpet out for the first time

Prior to RHS.jpg

I lined the rear of the bulkhead with the sound deadening mats, but used them more sparingly towards the front, basically just putting in the middle of then panels. Didn't want to add more weight than I had to.
Used rolls of foam over all floor areas, it's a much lighter material. Used some Velcro to put the carpet back down.

RHD.jpg

After speaking with Richard from TT exhausts I also decided to send the back box down to him. He suggested the original packing may have broken up and been blown out the back, he now uses a different material to what he used to.
He was very helpful and charged what I thought was a very reasonable amount for the exhaust to be repacked.

Overall, it's made a worthwhile reduction in noise and means I'm more likely to use the car more often. For me it's a good trade off between weight and making the car more usable.

[Loz]

Just to conclude this, I fitted the soundproofing a few weeks back.

Always good to see such a solid floor and no surprises after taking the seats and carpet out for the first time

Prior to RHS.jpg

I lined the rear of the bulkhead with the sound deadening mats, but used them more sparingly towards the front, basically just putting in the middle of then panels. Didn't want to add more weight than I had to.
Used rolls of foam over all floor areas, it's a much lighter material. Used some Velcro to put the carpet back down.

RHD.jpg

Can I ask you where you got the hexagonal pattern insulation from? I have a similar product but it's foil backed and id rather have some original type looking stuff if possible.
Many thanks.

[jellyfishfields]

Just to conclude this, I fitted the soundproofing a few weeks back.

Always good to see such a solid floor and no surprises after taking the seats and carpet out for the first time

Prior to RHS.jpg

I lined the rear of the bulkhead with the sound deadening mats, but used them more sparingly towards the front, basically just putting in the middle of then panels. Didn't want to add more weight than I had to.
Used rolls of foam over all floor areas, it's a much lighter material. Used some Velcro to put the carpet back down.

RHD.jpg

Can I ask you where you got the hexagonal pattern insulation from? I have a similar product but it's foil backed and id rather have some original type looking stuff if possible.
Many thanks.

It’s still foil backed, just that they use black foil instead of silver.

Wasn’t sure what the best one to go for, a lot of sales talk, especially with a couple of the newer companies from the US.
Just chose the uk company in the end, they all seem to be quite similar.

A link below to the pads I bought, I also used a roll of 6mm and 12mm foam.

https://www.deadening.co.uk/products/do ... -pro-black

[Loz]

Thanks for your help.
It's pretty much the same as my black foil stuff.
I guess it'll have to do. Yours looks good so that's encouraging.
Cheers.