[flash]

i notice they use lead

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[RickP]

[quote name='flash' post='32158' date='Mar 9 2007, 11:17 AM']i notice they use lead[/quote]





Yea, one used lead, the other a 1lb/sf vinyl. I was thinking that gluing/sewing the Sheetblok to the foam on the backside of a coupe's rear carpet may give a sound block system similar to the Dynapad. According to the Sheetblock website Sheetblok works better than lead. There are a lot of claims out there, tough to figure out just what to do.



Rick

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[flash]

this goes a lot to how external and internal sound is handled - they are very different and are dealt with very differently - these mats and such are generally used to handle sound INSIDE the car, and not to prevent sound from entering the car, which is the problem i see and am dealing with in my car



when in doubt, i always go with physics - blocking or dampening low frequency sound (below 100hz) from entering a space (not the same as dampening sound already in that space) involves preventing the resonating membrane from oscillating - this is usually done by either bracing or adding mass to that membrane



1lb/sq ft is not a lot of mass, and i would be surprised if it did anything significant without a very serious bond to the membrane



in studios, we have to screw the heck out of anything we are trying to stop low frequency sound on, cannot allow any air gaps, and have to make sure that those membranes we are working on do not make contact with other more susceptable ones



i don't see an easy answer, but good luck

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[unknown4u]

Last week I had to renew a constant velocity joint at the right axle. The cars is since that time a lot quieter.

I think I'm going to renew the grease in the other cv as well.



The old one has old thick and dirtye grease inside. I think it will help to reduce the noise between 60 mph and 90 mph.

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[RickP]

Did a DE this past weekend at Roebling Road in Georgia. The track has been receintly repaved and was awesome. Now to the point. On the way up the roadnoise previously described was there. On the way back the car was really quiet. It had been a couple of years since I had done a DE, taking a layer off the tyres really quieted them down. One more reason to go have fun.



Rick

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[pors968]

Wondering any of you installed hoodliner/dynamat under the hood? Does it improve engine noise?



Thanks,

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[15psi]

Improve noise or reduce it?

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[flash]

i installed dynamat in my doors, and all over the trunk area - i also installed in within my subwoofer enclosures



what it didn't do:



as anticipated, absolutely no change in low frequency sound from outside - no change in resonance within either



what it did do:



slight change in overall level - noticiable change at 1-3k - a general smoothing of that frequency - this really showed up in the stereo - i now need to re-tune the system - the biggest improvement though was in the subwoofer - knocked down a lot of the 200hz resonance the fiberglass shells were making



glad i did it, but no holy graille

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[SILVY968]

[quote name='pors968' post='34991' date='May 3 2007, 12:31 PM']Wondering any of you installed hoodliner/dynamat under the hood? Does it improve engine noise?



Thanks,[/quote]





I installed the hoodliner. Did 2 things:



1) stopped the rain from steaming from the top of my hood, can't be good for the paint.



2) brought down the overall noise of the engine, but left the intake "throat" and exhaust "tone" alone.

clearance is tight. you will find hoodliner scuff marks on the anti-sway bars and the front part of the valve vanity cover. they come off easily with Simple Green or the like.



Brian

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[flash]

how the heck did your anti sway bars get any where near your hood? are you talking about the strut tower brace, or are you driving the car upside down?

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[SILVY968]

picky, picky picky.

You get one little term wrong and you get stomped on.

If I wasn't driving on top of your old floor I'd be pissed.



You have wwaayy too much time on your hands. Ever thought about getting a hobby?



I was talking about the strut car brace, which keeps the towers from swaying. So there!



Brian

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[flash]

lol - too funny

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[paulw]

I'm surprised no one mentioned the effect of tyre size and type. I don't find the car particularly noisy running 16 inch on SO2's.

(I stuck to 16inch because of the dire quality of roads in the UK and to enjoy the car slipping a bit more - not to keep the noise down!)

Maybe you are all running 18 inch on race wear over there?

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[Renalicious]

I just recently got a set of new tires, and found that the cabin is MUCH quieter than before. I no longer have to raise my voice significantly to have a conversation, which is great. I have 17" Yokohama Adven Sport on all four corners. I'm still thinking about sound damping the trunk though, except using Fatmat instead of Dynamat. A buddy of mine FatMatted his whole civic (floor, door, trunk, even wheel wells) and it feels like a solid German made car now <img src="/forum/images/smilies/968/smile.gif" class="smilie" alt="" />



The major reason why I haven't done all this yet was the high cost of Dynamat, and until now, I didn't know of a suitable alternative.

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[xrad]

fatmat work fine.

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[flash]

google "fatmat" - i think you'll change your mind on which way to go



i did homework on this when i made my choice - i actually found a chart showing data on the capabilities of those, as well as others - i'll try to dig it up - budget was not a consideration, so all i wanted was maximum performance



in the end, i went with dynamat extreme - i am sold on it now, and have installed it in all 4 of my cars (thanks brian)



you get what you pay for

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[SILVY968]

absolutely. The world is full of bargains, just make sure the specs are equal.

Brian

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[xrad]

my vertical trunk test panel still in place after a +100 degree days w/windows closed. Fatmat'ed' the trunk, floor, a few door panels, under rear seats ....need less than 50 sq ft. Fatmat + new carpet is MUCH more quiet than stock padding and carpet. i cleaned all surfaces w/acetone before applying. surface has to be clean down as close to paint as possible...especially vertical surfaces. place it once. don;t re-stick it. Little bit o asphalt smell for a week or two. now no smell. fatmat 50 ft kit comes with knife and roller. fatmat is one long roll. easy to cut and apply.



http://www.968forums.com/index.php?showtop...20&start=20

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