Okay, next thing on my plan is to put down some Dynamat sound dampener. I’m planning to place it strategically and NOT cover the entire interior of the car. Someone stop me now if you have a compelling reason this is a mistake. Everything I’ve seen says not to cover the entire surface because it doesn’t add anything but weight.

Here is an example: https://www.quietride.com/web/viewer.html?file=https://www.quietride.com/catalogpdfs/datsun_z_catalog.pdf

Edited December 5, 20204 yr by Matthew Abate

1 hour ago, Matthew Abate said:

Someone stop me now if you have a compelling reason this is a mistake. Everything I’ve seen says not to cover the entire surface because it doesn’t add anything but weight.

I don't know if it is compelling or not, the tar mat that nissan put on the large flat areas of sheet metal was to stop the metal from vibrating at most if not all frequencies.  The Dynamat type mat does that but also works as an insulator to baffle sound and the foil layer helps keep heat out of the cab.

For instance the firewall inside the cab, Nissan used fiberglass insulation covered with tar impregnated fiber card and it only went up so high.  If you remove all that and cover the firewall and up behind the dash with Dynamat you'll notice how much quieter it is and the foil is helping with heat from the engine.

Trying to make a 240z quiet inside is a thankless job but you can certainly knock it down a bit by planning out your layers.

Right. I had planned to do other forms of insulation and soundproofing beyond the Dynamat. Haven’t quite figure out what yet.

so you’re saying that more Dynamat might not be a bad thing?

Edited December 5, 20204 yr by Matthew Abate

2 hours ago, Matthew Abate said:

so you’re saying that more Dynamat might not be a bad thing?

That's what I've found but I'm sure not everyone agrees.  When I'm driving the Z it is usually on the Hwy so I tried to minimize the road noise as much as possible.   Inside the cab the first layer on top of the primer was a Lizard skin type coating of micro spheres or glass balloons in a paint base, then the Dynamat, then dense automotive insulation and finally the carpets.  

It is not modern car quiet but it's pretty good, yes the car is 50-60lbs heavier than it was but I have some extra HP under the hood to compensate.   The 240 was designed as a sports car so minimal creature comforts, I went more for a Grand Tourer.

 

Yeah, I’m going that direction as well. The wife won’t ride in a “sports car”, hence the air con and insulation.

Im also starting to think maybe I don’t need the precut kits. $600+ seems like a lot.

I think I paid $100 for that 6'x6' piece of insulation from a automotive interior shop.  Don't forget the doors, try and cover as much of the door skin as possible, it's like a snare drum in there.

On 12/4/2020 at 4:08 PM, Matthew Abate said:

Okay, next thing on my plan is to put down some Dynamat sound dampener. I’m planning to place it strategically and NOT cover the entire interior of the car. Someone stop me now if you have a compelling reason this is a mistake.

That's the approach I've taken with the last 3 cars I've done, including the Z, and I've been happy with the results. Put the Dynamat on the large, flat areas and MLV and/or insulation throughout to block noise.

I haven't actually measured, because of laziness and overall disinterest, but I'd bet money that my 280z is less noisy than my wife's 2005 Ford Escape.

Need a little help.

I cannot for the life of me figure out where these two insulation clamps go on the fuel and brake lines.

Edited December 14, 20204 yr by Matthew Abate

Here's some pics I found...

 

Thanks, but I’ve got all of those in place. I know the one on the right goes somewhere because I have one that came on the car, but I’m not sure about the one on the left. I cannot find the spot the left one clips to at all.

I think the one on the right just clamps to the tubes and not the car itself, but could be wrong.

Edited December 15, 20204 yr by Matthew Abate

1 hour ago, Matthew Abate said:

Thanks, but I’ve got all of those in place. I know the one on the right goes somewhere because I have one that came on the car, but I’m not sure about the one on the left. I cannot find the spot the left one clips to at all.

I think the one on the right just clamps to the tubes and not the car itself, but could be wrong.

You are correct

Off of memory, it is in the tunnel near the diff

Okay. I maybe didn’t put it exactly where it goes, but the bigger one with 4 holes is now near the emergency brake mechanism. Once I put it on, everything sort of settled into place better, and it’s keeping one of the lines away from a spot it was rubbing, so I think it’s doing it’s job.

the one with 3 holes is still a mystery. I chased all the lines and couldn’t find a place where there was an empty bracket, particularly where I have 3 lines. Wondering if this is a 280 part.

Edited December 17, 20204 yr by Matthew Abate