Quietest bronco ever

[LawNerd]

I'm doing a frame off build and I'd like to sound deaden my bronco as much as possible. I've got the linex spray, the BCB roll insulation, a rubber floor mat, the firewall kit, and the Toms door felt kit. Anything else I can install, maybe something in the tub or tailgate? Other ideas would be great.

Thanks!

 

[nvrstuk]

Only one other thing... a set of Bose noise cancelling headphones... ;D

 

[ObscureMachine]

I put dynamat in my car, and in between the headliner and the hard top of the bronco. I'm not sure how it would work inside a bronco, especially if you're offroad and get water inside. You could probably put it inside your doors or on your firewall under the dash.

 

[ObscureMachine]

Only one other thing... a set of Bose noise cancelling headphones... ;D

;D;D;D

Or install a Chevy Volt motor.

 

[nvrstuk]

Every hole, must be filled. Any bolt hole or hole that is larger than needed (choke, throttle, brake/clutch rod, heater control...etc... there are a dozen holes thru the firewall...

Shifter holes thru the floor allow a lot of noise. Not sure what works best but they must be filled and be as small as possible.

Good luck

 

[Broncobowsher]

;D;D;D

Or install a Chevy Volt motor.

Leaf is Quieter
They had to install noise generators to alert pedestrians that there is a moving car near them. When they were making proposals for the sounds I suggested they use the soundtrack from http://www.youtube.com/watch?v=_E4erxIeHo8 but they didn't think that was fitting of the car. If you played around with the car you could make it work. There is a speaker and a sound generator, just need a new sound file.

Back to the original question...
Don't forget the bottom of the roof above the headliner
Spray foam does wonders. No joking, it is used on new cars all over the place. They use it sparingly in key locations. But more is generally better. Seal the fenders to the inner fenders/kick panels by the door jams. inside the rear wheel wells (door jam area). The minimal expanding stuff that stays a little soft when cured works best. But careful use or there can be water retention issues.
Air intakes sealed to the hood stop the sound path straight from the engine compartment to the air intake.
Seal all the holes in the floor and firewall, use good grommets.
Closed air cleaner with inlet duct going to the grill
full length exhaust going out the corner behind the rear tire, use heavier gauge tubing in slightly smaller diameter.
Clutched fan works good, electric is even quieter when off but generally noiser when running but a variable fan controller can help a lot. Be sure to get a fan that can actually keep it cool, Spal high performance or factory take off like a Taraus fan.

That is what I can think of right now.

 

[blubuckaroo]

Absorbing sound waves to keep them from bouncing around is as important as insulating them from getting into the car. If you could somehow install bows for a suspended headliner like cars had till the 80's the sound waves would be absorbed quite a bit.

 

[Pipehitter]

Looks like you got some pretty good answers. I had some pretty good luck by epoxying the bronco interior floor, applied two coats of lizzard skin, put down a layer of dynomat, then installed carpet. The carpet kit came with some additional pad to go under it up front. I then put some rubber floor mats down up front. Seems to work pretty good, but doesnt help much that I am running headers, dual exhaust with flowmasters I did it more for heat than anything else. Oh, and I put a dynomat type material above my headliner that was a foam backed material on .125 luan,

 

[Deano]

I used bubble wrap type stuf I got from Lowes and glued it to the roof then put my headliner back in.

then I got some insalation and put on the floor then put the floor mat carpet back in.

filled all the hole on the firewall then put some insulation in the door panels. it's so much nicer to drive. I'm going to do the weather stripping next

 

[zombie66]

For the tail gate I know they sell the rubber anti rattle pivot hinges but I went the cheap route and added an approprate sized washer to both sides of my pivot hinges to tighten any slop up and help with the noise. It worked great, I just used a thin piece of double sided sticky tape to hold the washers on while I installed the tailgate.

 

[LawNerd]

These are some great suggestions!

 

[N747JB]

;D;D;D

Or install a Chevy Volt motor.

And a couple fire extinguishers. %)%)

 

[ObscureMachine]

I was thinking about this last night. There's engine and exhaust noise, wind noise, metal panel vibration noise, and rattles. For some reason that helps my brain identify and find solutions to noise.

 

[Pa PITT]

ON MY Bronco with the Diesel motor in it. I've sprayed undercoating under the cab ..Plugged every hole in fire wall and sprayed them with undercoating . Then on inside of cab .. I used spray can bed liner then Rubberized under coating then Bubble wrap .. Then carpet.. I think the carpet has done more good than any thing I did.. I also put a couple cans of undercoating inside my doors.
.. While mine is twice as dust free as Running Buddies gas Bronco. Mine is still noisy. I think a lot of my noise comes in the shifter holes.
... And this last year before we went hunting in N Mexico he added several rags tape in and around his shifter holes ..it sure stopped his dust.

 

[jn2630]

The spray foam works well, but the places they put them on new cars usually piss me off. If you want to weld around areas that have foam in, on, or around it, it will probably catch fire. They put them inside rockers, A pillers, B pillers, frame rails,.... Almost burnt a car to the ground once because of that stupid foam.

 

[buckintone]

This is good

http://classicbroncos.com/forums/showthread.php?t=202711&page=3

 

[.94 OR]

I installed QuietCar in my wife's Escape. I would think for the money that guys are putting into undercoating, Linex, Dynamat, etc, this might be an alternative.

http://www.quietcar.net/

I also bought some of this Boom Mat. I will be spraying the inside of my doors when I get it out. I did clean my clothes dryer and spray the back side of the dryer panels to quiet it down.

http://www.designengineering.com/category/catalog/boom-mat-acoustical-products/boom-mat-spray

 

[nrramse]

A couple of inches of snow on the hood makes my truck sound a little quieter, so I bet that underhood matting works well. I've seen guys do it on TV a few times too, but haven't seen it done on a Bronco.

I would also insulate the rear wheel wells because they're directly exposed to road noise.

 

[Stroppe-Envy-77]

If you have the clearance, this Dynamat product keeps a lot of the underhood roar from getting into the cabin. (My stock air cleaner rubs on it just a bit, but it's worth it.)

http://www.dynamat.com/products_car_audio_hoodliner.html

The one issue with trying to chase noises is that as soon as you quiet one, you then notice another. Door frame whistle is one you'll start to notice once you get rid of others. I found some automotive-type 1/2" wide stick-on weatherstripping at a home supply store, and added that to the window frames so that it mates right to the regular weatherstrip on the cab.

Another source of noises typically comes from the tailgate/liftgate area. I added the pnuematic struts, which keep tension on the liftgate and replace those rattley factory sliding mechanisms. Also did the urethane tailgate pivots, which help a bit too. And those bi-fold arms that support the tailgate when it's down will often rattle too. Some have replaced them with boneyard cables from some other vehicle, but I simply coated the arms with liquid electrical tape, which helps dampen them (you can't go too thick on the insides where they join together when the gate's closed). And don't forget the tire carrier if you have one. The previous owner of mine added some foam pipe wrap where the carrier frame snaps into the latch to keep it nice and tight when closed.

 

[kaw550]

I used the hood liner. I thought it was okay. I then took the scraps and mounted them under the hood on firewall and the upper part of the tunnel. I thought that it did more but I am a little concerened they are going to fall onto the headers.