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Prior to all the work done on my Excursion, I was measuring 55-60db (measured using the Decibel X app on iPhone). After the work was done, one of the biggest noise makers has been the turbo whistle. Now, I am averaging ~70db. I have collected some info based on Mike's thread and listed out the steps to follow. Appreciate your inputs if I missed out anything here.
Disconnect batteries (Safety only)
Remove all seats and center console
Remove overhead console in front
Remove the sun visors
Remove the overhead console in rear (I have the DVD screen)
Remove all the plastic outlets for a/c
Disconnect all lights, switches and electricals
Remove the sun visors and handles on A pillar
Remove all plastic parts covering A pillar, B pillar, C-Pillar, rear side walls
Remove the headliner
Remove carpets front & rear
Remove all the door panels
Apply layers starting from the deepest areas under the dash and moving backwards.
Clean every surface thoroughly with wax & grease remover before applying the base layer
Apply the 80 mil kilmat layer on floor & roof
Apply SIless Hybrid MLV layer on floor & roof on top of kilmat
Apply 80 mil kilmat layer inside the door skins
Fill B pillar hollow areas with acoustic foam
Apply Siless Hybrid MLV layer to interior of rear wheel wells
Sound deadening is a rabbit hole. From what I can tell , you gotta go way down that rabbit hole before you actually get much of any results.
I covered the whole floor (because I had the seats & carpet up for another reason), didn't notice any real difference (subjectively of course, no db meter used before & after). While I wasn't expecting Cadillac quite, I thought I'd be able to at least notice the difference.
I don't have any additional steps for you to take, but sounds like a good project! I know Mike's thread I read back in the day was VERY comprehensive and well done.
I (we) will be expecting numerous pictures to ogle while you do all the work!
I did my entire interior including doors, all 6 inner and outer panels, under the roof above the headliner, and under the hood. In fact I used two layers of 80 mil Killmat. The I added Line-X to the roof for multiple reasons.
I question your decibel values. Most of us before treatment got readings in the 80's. You can see the readings I'm getting in my thread "Sharing my Excursion". It's like riding in a coffin now. I can have a conversation AND hear music at the same time. Take note that just doing one area at a time, you will notice incremental improvements and when you add it up you can expect a huge improvement. Another improvement you can do is silicone body mount bushings. They help with road noise and comfort. Oh, and unless you offload, get some good quiet tires like Michellin's. And don't forget under the hood with a new hood pad, OEM of course. When it's all done, you will be glad you went through the rabbit hole and found the light at the end. I did!
I'm considering doing the inner cowl area with Line-X where the windshield wiper mechanism is. I don't expect much of a change but the net result should show something.
I did my entire interior including doors, all 6 inner and outer panels, under the roof above the headliner, and under the hood. In fact I used two layers of 80 mil Killmat. The I added Line-X to the roof for multiple reasons.
I question your decibel values. Most of us before treatment got readings in the 80's. You can see the readings I'm getting in my thread "Sharing my Excursion". It's like riding in a coffin now. I can have a conversation AND hear music at the same time. Take note that just doing one area at a time, you will notice incremental improvements and when you add it up you can expect a huge improvement. Another improvement you can do is silicone body mount bushings. They help with road noise and comfort. Oh, and unless you offload, get some good quiet tires like Michellin's. And don't forget under the hood with a new hood pad, OEM of course. When it's all done, you will be glad you went through the rabbit hole and found the light at the end. I did!
I'm considering doing the inner cowl area with Line-X where the windshield wiper mechanism is. I don't expect much of a change but the net result should show something.
Good luck and keep us posted...
Thanks. I'll check out your thread in more detail. Tires are new, Nittos, installed a couple of months ago and have less than 500 miles on them. I also have installed a hood pad, and was planning to install Kilmat under that. Holding back on this as it may lead to containing a lot more heat under the hood.
Prior to all the work done on my Excursion, I was measuring 55-60db (measured using the Decibel X app on iPhone). After the work was done, one of the biggest noise makers has been the turbo whistle. Now, I am averaging ~70db. I have collected some info based on Mike's thread and listed out the steps to follow. Appreciate your inputs if I missed out anything here.
Disconnect batteries (Safety only)
Remove all seats and center console
Remove overhead console in front
Remove the sun visors
Remove the overhead console in rear (I have the DVD screen)
Remove all the plastic outlets for a/c
Disconnect all lights, switches and electricals
Remove the sun visors and handles on A pillar
Remove all plastic parts covering A pillar, B pillar, C-Pillar, rear side walls
Remove the headliner
Remove carpets front & rear
Remove all the door panels
Apply layers starting from the deepest areas under the dash and moving backwards.
Clean every surface thoroughly with wax & grease remover before applying the base layer
Apply the 80 mil kilmat layer on floor & roof
Apply SIless Hybrid MLV layer on floor & roof on top of kilmat
Apply 80 mil kilmat layer inside the door skins
Fill B pillar hollow areas with acoustic foam
Apply Siless Hybrid MLV layer to interior of rear wheel wells
Apply 80 mil kilmat layer to side walls
Reinstall in reverse.
Just FYI: Prakash, there is no reason to remove the 5 round rear A/C vents in order to take the headliner down. The headliner is fragile and there is risk of damaging the Keyed holes they fit into.
I did my entire interior including doors, all 6 inner and outer panels, under the roof above the headliner, and under the hood. In fact I used two layers of 80 mil Killmat. The I added Line-X to the roof for multiple reasons.
I question your decibel values. Most of us before treatment got readings in the 80's. You can see the readings I'm getting in my thread "Sharing my Excursion". It's like riding in a coffin now. I can have a conversation AND hear music at the same time. Take note that just doing one area at a time, you will notice incremental improvements and when you add it up you can expect a huge improvement. Another improvement you can do is silicone body mount bushings. They help with road noise and comfort. Oh, and unless you offload, get some good quiet tires like Michellin's. And don't forget under the hood with a new hood pad, OEM of course. When it's all done, you will be glad you went through the rabbit hole and found the light at the end. I did!
I'm considering doing the inner cowl area with Line-X where the windshield wiper mechanism is. I don't expect much of a change but the net result should show something.
Good luck and keep us posted...
Don't forget he's got the 6.0 now, so by nature his engine and exhaust noise will be different. I'm guessing the pronounced turbo whistle is from the articulating vanes?
you will not be able to put Killmat on the hood, it is way too heavy....
forget about that from a heat stand point.
that hood is heavy enough to lift as it is, put a bunch of Killmat on it, and you will need an Excavator to open the hood.
This will be done ONLY if there are scraps or extras from the rest of the project.
Originally Posted by 01__Excursion
Just FYI: Prakash, there is no reason to remove the 5 round rear A/C vents in order to take the headliner down. The headliner is fragile and there is risk of damaging the Keyed holes they fit into.
Thanks for the pointer. I will be careful with the vents.
Originally Posted by 01__Excursion
Don't forget he's got the 6.0 now, so by nature his engine and exhaust noise will be different. I'm guessing the pronounced turbo whistle is from the articulating vanes?
Yes. I replaced the turbo wheel. When the windows are rolled up, I hear a very pronounced whistle that sounds just like a jet engine taking off when that turbo kicks into high gear. If I roll the windows down, I don't hear it as much.
Thanks. I'll check out your thread in more detail. Tires are new, Nittos, installed a couple of months ago and have less than 500 miles on them. I also have installed a hood pad, and was planning to install Kilmat under that. Holding back on this as it may lead to containing a lot more heat under the hood.
Looking forward to following your project Prakash, what’s your opinion on those Nitto Duras, mine have been great and super quiet for a big truck tires.
Looking forward to following your project Prakash, what’s your opinion on those Nitto Duras, mine have been great and super quiet for a big truck tires.
Tom, I haven't really taken the truck out on long trips yet or even in wet weather. It has been good so far on my local jaunts. Pretty quiet.
Fwiw....in the factory ford manual under fixes for customers complaints on engine noise it list making sure the fender sound deadner is in place.
We all want to do it, but from what I've read, the results are mixed. Lots of time, energy and material. One thing for sure... If you're gonna do it, do ALL of it.
Fwiw....in the factory ford manual under fixes for customers complaints on engine noise it list making sure the fender sound deadner is in place.
We all want to do it, but from what I've read, the results are mixed. Lots of time, energy and material. One thing for sure... If you're gonna do it, do ALL of it.
My 6.0 had an MBRP straight pipe. It was crazy loud inside, kids complained a lot!
We had a huge improvement with a MBRP Quiet Tone 30 resonator.
It was still loud, but tolerable.
However, we had a set of Nitto Terra Grapplers fail on us recently. We replaced with the new BFGoodrich KO3 A/T tires, and this made all the difference. I considered sound dampening, also. But not anymore! I had no idea how much of the noise in the truck was from the tires.
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