Sound deadening?

[jeeppapa]

Anyone found fairly inexpensive way to deaden the road noise in the cab? This may sound crazy but has anyone tried spray foam. I’m not talking about drain areas. Maybe upper B pillar and the like. It’s just an idea. Not to enthusiastic about paying for the higher end mating. Just looking at other options and want to hear any other ideas that have had some success. Its really driving me nuts.

 

 

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[mnkyboy]

Peel & Seal from Lowe's is probably the cheapest you will find, it's $16.50 a roll.

 

It's similar to Fat Mat.

[DirtyComanche]

Fix your seals first.  That's where most of the noise leaks in.

 

I honestly don't think I'd be willing to use peel and seal...  but I've thought about it before.

 

B-Quiet Extreme is the bang for the buck stuff: https://www.b-quiet.com/collections/50-sq-ft-rolls/products/b-quiet-extreme-50sqft

 

The performance of these products on a roof is minimal, it will just knock out some of the tinny sounds.

 

Otherwise you need to add mass...  There was a thread here that I started on that, I believe.

 

If you to spray something into the B-pillar or whatever, there is sprayable products.  I don't know how well any of them work, but Lizardskin seems to be the most commonly used.

https://www.amazon.com/050220-Spray-Deadening-Unwanted-Vibration/dp/B001URKV0G

https://www.summitracing.com/int/search/part-type/sound-deadening-coatings

[jeeppapa]

Fix your seals first.  That's where most of the noise leaks in.
 
I honestly don't think I'd be willing to use peel and seal...  but I've thought about it before.
 
B-Quiet Extreme is the bang for the buck stuff: https://www.b-quiet.com/collections/50-sq-ft-rolls/products/b-quiet-extreme-50sqft
 
The performance of these products on a roof is minimal, it will just knock out some of the tinny sounds.
 
Otherwise you need to add mass...  There was a thread here that I started on that, I believe.
 
If you to spray something into the B-pillar or whatever, there is sprayable products.  I don't know how well any of them work, but Lizardskin seems to be the most commonly used.
https://www.amazon.com/050220-Spray-Deadening-Unwanted-Vibration/dp/B001URKV0G
https://www.summitracing.com/int/search/part-type/sound-deadening-coatings

Great reply. I’ve got the seals anyway. I have 2 Comanche and I’m going to do an Xj too.


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[jeeppapa]

Peel & Seal from Lowe's is probably the cheapest you will find, it's $16.50 a roll.
 
It's similar to Fat Mat.

Have you used the peal and stick?


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[mnkyboy]

My MJs floor is covered with Peel & Seal and has bedliner sprayed over it.

 

It made a huge difference in my rig.

[johnj92131]

My suggestion is to buy a sound meter. Then you can measure where the sounds come from and take action on the largest source first.  

Someone posted a link to a very reasonablely priced sound meter

 

[Minuit]

Get this one. Just the basic one will be fine.

 

https://www.amazon.com/BAFX-ProductsÂ-Decibel-Reader-Battery/dp/B00ECCZWWI/ref=sr_1_3?ie=UTF8&qid=1520395811&sr=8-3&keywords=sound+pressure+meter

 

... and tell me how loud your undeadened truck is so we have more data points to compare with! For reference, my deadened '91 is good for about 72 dBA at 70 as long as the wind isn't blowing too hard. The wind noise on these trucks can get a little crazy. All of my SPL measurements are taken with the climate control off (so no air is blowing at the meter) with the meter sock at about shoulder level in the center of the cab.

[SatiricalHen]

I’ve used peel and seal in my Cherokee and my Comanche along with frost king duct insulation to help with temperatures some. Makes a huge difference. Everyone is shocked how quiet my cherokee is, and the Comanche doesn’t have any interior other than the dash and the seat. It was unbearably loud, but it’s much better now.


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[krustyballer16]

Kill road noise with engine noise!
I hear no road noise over my little loud @$$ Cummins lol

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[johnj92131]

Guys, without a before and after sound meter reading, it just like a butt Dyno. No real way to compare real results

 

[mnkyboy]

You don't need a sound reading to know that you no longer need to yell to have a conversation with your passenger.

[DirtyComanche]

39 minutes ago, mnkyboy said:

You don't need a sound reading to know that you no longer need to yell to have a conversation with your passenger.

 

This.

[Pete M]

just a couple points: 

-spray foam should never touch a vehicle. it seems to absorb moisture and make things worse.   

-water gets everywhere.  every hollow spot should be considered a drain area.  heck, my windshield was leaking in the 86 and dribbling down inside the A-pillar.   took forever to figure out how water was pooling up on the floor.  

[HOrnbrod]

1 hour ago, mnkyboy said:

You don't need a sound reading to know that you no longer need to yell to have a conversation with your passenger.

 

Mnkyboy don't want or need no sound deadening when he gets that supercharger spooled up.  That's sweet music..   

[mnkyboy]

1 hour ago, HOrnbrod said:

 

Mnkyboy don't want or need no sound deadening when he gets that supercharger spooled up.  That's sweet music..   

 

I still haven't bothered to hook the stereo back up in the truck since I did the MPFI harness, the engine sings pretty good, probably the only case where constant whining is a good thing.

 

 

I couldn't do no sound deadener,it was pretty bad. After I got the truck back together I drove it about 1 1/2 hrs on the freeway to my brothers house without any sound deadening, it was shortly after that I pulled everything out and added the Peal & Seal, I could hear the difference even before I got the interior back together.

 

It may not be Dynamat but it cost me around $30 to do the entire floor and made the truck much more bearable for long drives.

 

 

 

[jeeppapa]

Love to hear that. Have thought about supercharge many times but that would spell ticket trouble had enough of that.


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[jeeppapa]

 
I still haven't bothered to hook the stereo back up in the truck since I did the MPFI harness, the engine sings pretty good, probably the only case where constant whining is a good thing.
 
 
I couldn't do no sound deadener,it was pretty bad. After I got the truck back together I drove it about 1 1/2 hrs on the freeway to my brothers house without any sound deadening, it was shortly after that I pulled everything out and added the Peal & Seal, I could hear the difference even before I got the interior back together.
 
It may not be Dynamat but it cost me around $30 to do the entire floor and made the truck much more bearable for long drives.
 
 
 

I think I’m going to give it a try. I’m going attempt to suppress any asphalt odor. Thought bought Flex Seal but I’ve never used it. Fix the floorboards, seal it and the body seals, through down sound deadening, reseal it with the same as the first coat or flex seal. All depends on compatibility of materials.


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[johnj92131]

On 3/7/2018 at 9:22 AM, mnkyboy said:

You don't need a sound reading to know that you no longer need to yell to have a conversation with your passenger.

 

Yes, that is true.  But if you want to quantify results from different sound deadeners, you really want accurate before and after sound meter readings.  Same thing if you want to know if simple peal and stick over a bare metal floor is better or worse than standard factory underpad and standard carpet.

 

I suspect that the #1 source of noise is the tire tread and the  #2 source of noise is old window and door seals.  Without actual measurements, we really don't know accurately.  So I am ordering the sound meter Minuit linked from Amazon.  It is inexpensive at $15 and will give good information I can cross check with Minuit's results.

[mnkyboy]

There's several SPL meter apps you can download for free.

 

I may take some readings on mine just out of curiosity,I'm sure it's much louder than the average street driven MJ, my MJ is about as refined as an ultra4 car.

 

 

[Minuit]

4 minutes ago, mnkyboy said:

There's several SPL meter apps you can download for free.

 

 

 

Those are absolutely useless and won't tell you much of anything. I downloaded a few different apps on my phone, and all gave different readings, and none agreed with my actual SPL meter.

[mnkyboy]

Well that sucks, I haven't played with any of them.

[terrawombat]

I used a spray-on sound deadening coating called QuietCoat on the entire interior of my MJ when I had it stripped down.  It came highly recommended by a former co-worker that used it while restoring his VW Bus and he said it made an incredible difference.  My experience with the product wasn't quite the same.  While it seems like the cab doesn't have as much road noise, it is still very much present.  I think the reason we had different experiences with it is because his VW Bus is basically a tin can and anything you do to the interior is a huge improvement.  The Jeep Comanche has a bit more rigidity to it than those old VWs so the sound deadening wasn't quite as noticeable.  I also wouldn't recommend because it's very expensive and the appearance of the final product looked pretty tacky to me - the stuff didn't lay down nice at all.

[Sir Sam]

1 hour ago, terrawombat said:

I used a spray-on sound deadening coating called QuietCoat on the entire interior of my MJ when I had it stripped down.  It came highly recommended by a former co-worker that used it while restoring his VW Bus and he said it made an incredible difference.  My experience with the product wasn't quite the same.  While it seems like the cab doesn't have as much road noise, it is still very much present.  I think the reason we had different experiences with it is because his VW Bus is basically a tin can and anything you do to the interior is a huge improvement.  The Jeep Comanche has a bit more rigidity to it than those old VWs so the sound deadening wasn't quite as noticeable.  I also wouldn't recommend because it's very expensive and the appearance of the final product looked pretty tacky to me - the stuff didn't lay down nice at all.

 

 

I also used this extensively in one of my VW Vans, and it is MUCH quieter because of it. Yes it is expensive. I sprayed it on so I had a very good finish quality with it. I think the thing I like about it is that you get a chance to coat ALL surfaces around, heck even the inner fenders and under cab can be quickly sprayed down.

 

And for maximum effect add some of the other products on the large reasonating surfaces to help quiet it down.

 

Terra how many coats did you put on?

 

Here is a video showing the difference between a treated van and an untreated van. Granted its not an in cab decibel reading, but its a pretty good side by side comparison.

 

https://www.youtube.com/watch?v=E3q30q5Nf9s

 

[Marine1Texas]

Since day one our 87 mj has never been quiet. After the exhaust rusted off we put on a flowmaster 40 series with a 13 inch cherry bomb in place of the cat. It is a tad louder exhaust. We did add carpet over the rubber mat and some foam padding a few years later , but road noise just keeps coming in the same. When driving over 45 the radio is at 25 to 35 volume. when I am doing 70 have to jack the volume to 40 to 45. This truck just has such thin metal that noise seems to come right in. My 06 f250 is very loud, but the steel is nice and thick on the bottom so I hear almost nothing. The truck was built light, but not built to be quiet, my wifes 2016 trax is smaller, quieter however 1000 pound heavier. I am sure you could get much more quiet if you spend lots of money.