Sound deadening and noise reduction project

That's a lot of work! I bet your fingers are raw!

I did a similar job on my GenII and it definitely helps although it is expensive and heavy. Thank you for taking the time to post pictures of all the spots you hit with product. When you are finished and have some drive time could you please let us know what areas were most affected and which areas showed minimal improvement? For me the door panels made the biggest improvement.

 

Most impressive. I genuinely hope the final results are worth the effort. It appears that you did a professional, and very thorough job.

As for me, I have no inclination to take on such an exhaustive project. Plus, I have no need to go to such an extensive effort. I found that changing the tires to Michelin Energy Saver A/S resolved all my road noise concern. I have absolutely no complaint about noise .... in fact, the Prius is one of the quieter vehicles I have owned in recent years. My Acura RSX was significantly noisier as is my Honda CRV.

 

Great job Inseek, and thank you so much for posting. I removed my front passenger side door panel to see what kind of work would be required. There are ALOT of wires that are very nicely routed and attached to the door itself.

Question: Should I remove the wires that are attached to the door or should I just dynamat right over them.

Did you put the plastic moisture barrier back or did you just dynamat over the opening.

Again, thanks so much for taking the time to take pictures and post these for us! This information is very very helpful to me!

 

Wow, you're gonna hear a pin drop inside your car!

good work!

 

The other thing you might consider is quieter tires.
I am using Goodyear Assurance ComforTread which are supposed to be quieter.

As far as sound-proofing, I am interested to see the materials you used.
In theory you need mass to stop sound. In the home, this could be a thick brick wall or Pb(lead)-backed wall board, so weight is issue as F8L mentioned. My interest is more sound proofing in the home but may be some learnings here.

 

Question: I removed door panel and noticed alot of nicely routed wires, all seem nicely attached to the door. Should I remove the wires from the door so they are not attached to it and dynamat under the wires, or just dynamat right over the wires that are attached to the doors, or dynamat around them? Thanks!

 

...my tires pretty old now, so I am sure some new choices are out there, just saying tires play a role in noise

 

You did a really nice job with the door and trunk...Many years ago I was in the auto upholstery business...we specialized in hot rods , antique cars and high end interior modifications (including sound proofing)..we used 7/16 dense felt carpet padding...it worked great then...and will now...I just bought 54 sq feet for $34.00...total...you apply it with spray adheasive in the same manner as dyna mat....I will do the project in the next few weeks (I have a 2012 II)...but will include the front cabin..You can buy the material from any auto upholstery supply...I bought mine from perfect fit here in portland , OR...most will ship ups anywhere...

 

looks great I did the same thing exactly. Did you put any ensolite under the rear seat and over the top of the rear wheel houses I found that to help with road noise. also the front wheel house under the carpet needs extra insulation.

 

This is absolutely beautiful work and I hope you let us know how well it works out. I am definitely jealous. I want to point out that you need to pay a little attention to spare tire storage: In the stock Prius, the spare sits on a piece of white styrofoam, and it is a major source of squeaks and rattles. I wrapped the styrofoam in a cheap piece of felt, which made a big difference. The tool tray which sits on top of the spare also needs a little rattle reduction attention, and there is a good thread here about simple, cheap felt treatments for the rear hatch area and license plate to prevent rattles.