Soundproofing my D1

[LtFuzz]

The 6.2 is a bit loud in the D1 so I'm going to embark on a soundproofing project.

Did a search and it seems like this isn't as common a project with D1s (for obvious reasons), but some people had good experiences with Peel & Seal -- this stuff seems to be much cheaper than Dynamat.

I'm thinking of doing the firewall, floor pans, and transmission tunnel.

My questions are -- is it worthwhile to really pull everything out (firewall)? Or can I just cut and paste my way around the various hoses & connections? Is it worth it to pull the door cards out and do the doors? And are there any specific brands of insulation I should consider and/or stay away from?

Thanks for any feedback

 

[bobtail4x4]

first you have to ask will it get wet?

if not use the compressed felt, if yes its gonna cost you.

 

[LtFuzz]

first you have to ask will it get wet?

if not use the compressed felt, if yes its gonna cost you.

Not crazy wet, but some mild river crossings are probably in my future.

I've gone bumper deep and have yet to have water enter the cabin.

 

[REDROVER]

Not crazy wet, but some mild river crossings are probably in my future.

I've gone bumper deep and have yet to have water enter the cabin.

i used heat and soundproofing material from the lexus ls400. still i have some heat and sound coming in

however it will be almost impossible to 100 % soundproof that 6.2

may be there are better materials to be used but i had those left from the crashed ls4oo so i used them.

 

[LtFuzz]

i used heat and soundproofing material from the lexus ls400. still i have some heat and sound coming in

however it will be almost impossible to 100 % soundproof that 6.2

may be there are better materials to be used but i had those left from the crashed ls4oo so i used them.

Not trying to get to 100%, just to take a little bit of the dB from the cabin.

I definitely don't have an IS400 sitting around either.

Eric, where did you put the the materials you used?

 

[Scott Brady]

With the interior db being a combination of all vehicle noise, I would also recommend looking at other areas for refinement, including removing roof racks (if you have them) or installing a wind faring. Tires are also big contributors. On my DI, the majority of the noise comes from the t-case and rear axle gear set.

Another notable solution is going with synthetic fluids in the axles and t-case. Surprising how much that quiets it down.

 

[LtFuzz]

With the interior db being a combination of all vehicle noise, I would also recommend looking at other areas for refinement, including removing roof racks (if you have them) or installing a wind faring. Tires are also big contributors. On my DI, the majority of the noise comes from the t-case and rear axle gear set.

Another notable solution is going with synthetic fluids in the axles and t-case. Surprising how much that quiets it down.

Good suggestions, but in my case it's simply a case of the 6.2L being several orders of magnitude louder and hotter than a Rover V8. And clearly the Disco cabin was designed with the noise of a V8 in mind as there is very little in the way of significant sound or heat reducing materials.

Interesting note about the axles/t-cases -- the R380 isn't "loud" but I can certainly hear the plates spinning at lower speeds.

 

[REDROVER]

t case is a good point. they are very loud. i put my SP material on fire wall coming down to the edge of the frame. hood scoops will help a lot taking that heat away from the engine bay.

i am gonna put 2 on mine this week

 

[Series1Rangie]

The 6.2 is a bit loud in the D1 so I'm going to embark on a soundproofing project.

Did a search and it seems like this isn't as common a project with D1s (for obvious reasons), but some people had good experiences with Peel & Seal -- this stuff seems to be much cheaper than Dynamat.

I was doing some research myself as I need to do this in the classic, and I found that some people had issues with Peel&Seal in high temp areas (SW) I also found Quiet Crap by CruiserCrap (no affiliation) Which is priced better and seems similar to dynamat.

My questions are -- is it worthwhile to really pull everything out (firewall)? Or can I just cut and paste my way around the various hoses & connections? Is it worth it to pull the door cards out and do the doors?

I really think it has to do with your goal. Some noise can be canceled by using small pieces to reduce resonance in the truck body, but for heat, you need to keep as much out as possible. So the more you cover the less heat. Also if you keep it from warming the metal even better. Look at Lizardskin, and similar paint on products, (or DIY and mix glass beads in with paint) and you could do the firewall on the engine side, and the transmission tunnel on the outside, which would help a lot too IMHO

HTH

Mike and Myles

 

[LtFuzz]

Thanks for the tips -- the "Quiet Crap" seems like a pretty reasonable price. I think I'll give that a try.