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Old 07-30-2011, 12:52 AM
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The quest for Quiet

Okay, I don't want a rolls royce, but sometimes after a long drive my ears are ringing. So It would be nice, to keep the loud sound & noise on the outside, so it's just a little more civilized on the inside.

For my car, the loudest it gets, is at highway speed. Noise from the engine, tires, wind noise, exhaust are all contributors.

So I have started to tackle this, and made some progress.

First, the car was originally insulated with in some cases, several layers of peel and stick, and that plastic foil insulation (like bubble wrap-the home centres sell)

I realize now, the foil stuff is pretty much useless in a car. It reflects sound, almost as muchas it dampens it.

So I have ripped out some of it already, and replaced it with automotive carpet insulation, using contact to adhere it to the back of some of the interior trim panels.

I ripped (foil insulation) it out of the trunk, and replaced it with a dyamat foam (on sale thie weekat my auto centre) and a layer of black carpet.

So far, yes it's made a difference.

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Old 07-31-2011, 06:45 AM
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That is why I like A/C and heat. You keep the windows UP and road noise and all that OUT.
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Old 07-31-2011, 08:09 PM
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Originally Posted by latech
That is why I like A/C and heat. You keep the windows UP and road noise and all that OUT.
NOT if you are driving a 2002 corvette coupe with runflat tires! Nosiest car i have ever owned. Just telling the wife yesterday while out for a country drive, I need to strip this interior and spend $500 on noise abatement materials. Her reply, what has been stopping you from doing that the last 3 years?
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Old 08-11-2011, 11:29 PM
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Okay, the next step I have taken, is wrapping the mufflers with header wrap/insulation.
This did make a difference on the sound radiating from the mufflers through the floorboards, and bouncing off the road surface.
It make a bigger difference, than changing the trunk insulation.

The catch 22, might be that the exhaust gasses stay hotter and are louder at the tail pipe.

Why do I say that? A few days ago, I took the car to a track day (road course), hosted by our club, and after the first set of runs on the road course, I got cited for excessive noise!
I flipped the switch on the exhaust, knocked off some hp. and carried on, otherwise I would have been kicked off. I was told I was the loudest car on the track. Louder than a cobra replica, and a GT40 replica!

It sounded great to me, I don't really agree with the excessive noise warning
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