Reducing NVH (Noise, Vibration, Harshness)

[Milford Cubicle II]

You are concerned about decreasing NVH off road?

Who said anything about NVH off road?

 

[Talyn]

Well, one usually uses 4x4 off road or in in climate weather, and I don't see the u-joints breaking at full lock on road nor should binding be a real issue. If you feel the u-joints in 2wd you probably need to change the u-joints.

 

[gradon]

For the love of God, do not use the Daystar poly tranny mount(my @$$ is tired of it, even though it does prevent rocking under torque).

 

[Root Moose]

One thing I forgot to mention. I have manual hubs on my front axle. When the hubs are unlocked there is noticeably less noise.

 

[offroadordnance]

The OE manufacturers have been using structural foam sometimes referred to as pillar foam to reduce NVH, increase structural rigidity, and provide additional side impact protection. A similar product has been developed for military vehicles to protect our troops. I think 3M or Loctite are marketing a product to repair newer vehicles manufactured with the foam. Possibly, the repair material could be used to fill frame cavities, pillars, etc to reduce NVH. Probably someone working at a collission repair shop could share their experience with the foam

 

[Talyn]

The OE manufacturers have been using structural foam sometimes referred to as pillar foam to reduce NVH, increase structural rigidity, and provide additional side impact protection. A similar product has been developed for military vehicles to protect our troops. I think 3M or Loctite are marketing a product to repair newer vehicles manufactured with the foam. Possibly, the repair material could be used to fill frame cavities, pillars, etc to reduce NVH. Probably someone working at a collission repair shop could share their experience with the foam

Thats some good info. IIRC I read about a foam like that some place, but can't recall where. Looks like the 3M stuff is this: http://www.autobodytoolmart.com/3m-automix-pillar-foam-08458-p-10857.aspx. There is also this 3M foam http://secure.terrys.net/viewProduct.php?productID=3M.4330 Loctite makes Terofoam, which looks to be similar, but can't find any US distributors of it. Google "pillar foam" and some good results come up. Lots of places to use this on an XJ. All the pillars, inside the frame rails maybe, the door impact bars on the later ones, etc. I'm sure the cost would add up though.

 

[garr]

The OE manufacturers have been using structural foam sometimes referred to as pillar foam to reduce NVH, increase structural rigidity, and provide additional side impact protection. A similar product has been developed for military vehicles to protect our troops. I think 3M or Loctite are marketing a product to repair newer vehicles manufactured with the foam. Possibly, the repair material could be used to fill frame cavities, pillars, etc to reduce NVH. Probably someone working at a collission repair shop could share their experience with the foam

I wonder if the Hilti Filler foam would work?

 

[bmpweXJ]

I'm thoroughly baffled. Just where in the hell do you drive on or off-road where you never turn at full lock??? :huh:

Do you know what "full lock" means? Serious question.

LOL. I never said I'm never at full lock. I said a small fraction of my miles on or off road is at full lock.

 

[John(XJ)Jeep]

For the love of God, do not use the Daystar poly tranny mount(my @$$ is tired of it, even though it does prevent rocking under torque).

I'll be getting one of those soon along with the 1" riser motor mounts as well since it already shakes like the dickens and is noisy as hell too. At idle the mirrors shake and does my change. I love it!

Use softer springs and shocks, use rubber mounts, bushings ect. and use lots of dynamatt and double up on the wooly second layer insulation under the carpets. Use lower load rated or softer tire that emphasize on road noise. Install a second muffler and resonator. Use loctit on stuff that seems to always come loose.

Wear earmuffs, sit on a pillow and wear gel padded soles. !!!1

 

[bmpweXJ]

Load range on the tires seem to be a reoccurring theme.

I've looked all over tire shack and the lowest offroad worthy 33' by 16' tire I can find is a "D" (what I'm using now). Is there anything available in a "C" range?

 

[Milford Cubicle II]

How does this foam stuff not promote rust? Other than that it sounds great.

 

[Root Moose]

Load range on the tires seem to be a reoccurring theme.

I've looked all over tire shack and the lowest offroad worthy 33' by 16' tire I can find is a "D" (what I'm using now). Is there anything available in a "C" range?

IIRC BFG ATs come in C range.

 

[souske]

How does this foam stuff not promote rust? Other than that it sounds great.

its probably closed cell foam :dunno:

 

[AeroSync]

Load range on the tires seem to be a reoccurring theme.

I've looked all over tire shack and the lowest offroad worthy 33' by 16' tire I can find is a "D" (what I'm using now). Is there anything available in a "C" range?

You can either have sexy looking rims (Moabs) or have a soft tire (Load Range C), but you can't have both.

I know this because I have Moabs and wish I could get Load Range C, but I am stuck with D thanks to these wonderful rims.

 

[bmpweXJ]

You can either have sexy looking rims (Moabs) or have a soft tire (Load Range C), but you can't have both.

I know this because I have Moabs and wish I could get Load Range C, but I am stuck with D thanks to these wonderful rims.

Yeah, this is the unfortunate conclusion I'm coming to. I'm thinking I'll be looking for a new set of wheels soon.

(to the previous poster that suggested the BFG ATs: I think they're a great tire... Ran them for about a year. They are though, not aggressive enough for me and don't come in a 33x16" C load size. ...and they don't shed mud worth crap. )

 

[srmitchell]

I noticed a big difference in nvh reduction when I did my frame stiffeners.

Also, I have a rock hard 4x4 cage, that really cut down on the body groaning and twisting.

 

[souske]

I noticed a big difference in nvh reduction when I did my frame stiffeners.

Also, I have a rock hard 4x4 cage, that really cut down on the body groaning and twisting.

This. Stiffeners would be my 1st mod if I had to do it all over

 

[rockclimber]

you could always leave your purse at home and be a man about it...

 

[bmpweXJ]

you could always leave your purse at home and be a man about it...

... and you could contribute something instead of being an ass.

 

[rockclimber]

... and you could contribute something instead of being an ass.

nahhhhh....


I hear the IRO LA kit reduces vibes... you could always go that route...