Hello fellow Avalon owners, I wanted to post an e mail response I received from the Dynamat technical support team. They are recognized as a leader in making materials for sound insulation. I asked them how to best insulate the Toyota Avalon 4th generation. The following is their response:


First, install Dynamat Xtreme on the floor/firewall, doors, roof and trunk.(
we recommend treating the roof even though you did not specify the roof)
This product will reduce noise from resonations/vibrations in the sheet
metal and will give the vehicle a more solid, tight feel. Xtreme is very
thin, about 1/16". On the floor and trunk floor over the Xtreme, we
recommend DynaPad. This product with its 1 pound per sq ft vinyl sound
barrier in between 2 open cell foams,(7/16" total thickness) is very
effective in reducing lower frequency noise like road noise and exhaust
noise. On the firewall, over the Xtreme, install our 1/2 inch Dynaliner.
This is a closed cell, peel and stick foam that will also help to reduce low
frequency noise and is easy to install on a vertical surface. Use our ¼ inch
Dynaliner on the roof (also over the Xtreme). For the best possible results,
we recommend 100% coverage.

Our Hoodliner can also be installed the underside of the hood. This product
is a 3/4 inch thick, peel and stick foam with an aluminized Mylar face that
will help to reduce engine heat through the hood, it will also help reduce
engine noise. ( we recommend installing Xtreme on the thin, sheet metal
areas (triangles) on the hood before installing the Hoodliner for best
results.


We hope this information was helpful. Please let us know if you have any
other questions.

Best regards,


Technical Solutions
Dynamic Control of North America Inc.
www.dynamat.com



Hope you find this of use

I find the Avalon quite quiet. Some of you guys are really obsessed with this stuff. The Avalon is a low to mid priced and fairly reliable car that does a lot of things well for what it is. If noise is this important to you why not just get an LS460 or some other super quiet car.:dunno:

 

I find the Avalon quite quiet. Some of you guys are really obsessed with this stuff. The Avalon is a low to mid priced and fairly reliable car that does a lot of things well for what it is. If noise is this important to you why not just get an LS460 or some other super quiet car.:dunno:

I understand what you are saying. But with a super quiet ride with a proper insulation, the Avalon has a lot of base qualities to be a poor man's LS 460. Instead of dishing out over $80K, under $40K with the insulation, you can have a super quiet car. In the case of my XLE, I spent $31K including the insulation materials and it is as quiet as my friend's LS 460!!! My fully insulated Avalon is much quieter than the LS 400 that I bought brand new. Driving in a super quiet cabin gives you a lot of benefits: (1) you will enjoy your music more, (2) you can relax more while driving (less stress especially while driving in a stop-and-go traffic and (3) you will feel much less fatigue especially while driving a long distance due to less noises and vibrations. Also, you will enjoy the sounds of the doors when you shut them. If it is a Corolla, it may not be worth doing a full insulation. But as for the Avalon, it is worth doing it. :rockon:

 

I did Dynamat Extreme on my 99 on the doors, trunk and rear parcel shelf. I still have enough to for under the rear seat. At 70mph noise dropped to 65dBs from 72. Now it's quieter than the 07 Avalon and LS400 we had.

 

Good for you!!!:rockon:

 

Thanks to all. Will try changing out the tires. My wife has had her 2006 Camry LE since new, and last year got a 2014 Avalon XLE. Still have the Camry, and we use it on holiday and other long trips. Why???? Because in regard to ride, handling, noise and overall comfort on an extended trip the Camry runs circles around the Avalon. Plus the sound system is far superior on my inlaw's 1998 Olds 88; the analog and digital speedometers on the Avalon show very different rates of speed, as the nice patrolman pointed out to me as he wrote the ticket; the AUTOMATIC AC works well so long as you adjust the temperature and the fan speed manually; the telescoopic steering wheel moves in and out 1.002 inches and tilts up and down 1.003 inches (what a total waste of money and effort); and finally the dealer's "Certified" portion of the warranty was denied by Toyota because the car had been a rental previously. That also negated the standard auto warranty. We were advised of the car's history AFTER purchase. Final result....... we are going to sue the dealership and Toyota. Anyone else have any similar issues they would like to join in on a lawsuit???? Who knows? We may end up with a class action yet.

 

The new Camry's don't ride like the 2006 either. I have a 2012 Camry XLE and a 2014 Avalon XLE and the ride is very similar. Both have the same wheels and tires. The Avalon is quieter though. We have had Camry's since 1998 and the old ones had a softer ride for sure.

My analog and digital speedo is always 1 MPH different. Not near enough for a ticket. The sound system is OK. But we don't crank it up loud.

Good luck with your lawsuit. We are happy with ours.

 

Problem with mine is that digital that is right in front of yhour eyes is 5 miles low. Toyota asserts that is within normal specs.

 

Are your tires the correct size? People complain a lot about the ride on these and one fix is to switch tires to something with a taller sidewall. Just switching to a 50-series tire will throw the speedo off over 3%.

If your old Camry handles better than the Avalon, it makes me think someone has installed tractor tires on your Avalon.

According to radar signs along highway, my digital reads about 2mph fast at 80mph. The analog appears to be right on the money. I have the stock 225/45-18 tires.

 

Odometers

You are right about the tires. Tractor tires WERE installed...... as original equipment by Toyota.

 

You are right about the tires. Tractor tires WERE installed...... as original equipment by Toyota.

Well you said you bought it used and as a rental so who knows what kind of abuse and poor maintenance it was subjected. Toyota CPO is a joke for the most part.

Mine came with the Bridgestones which are garbage but never felt sloppier than a base Camry.

 

Sound Proofing: How much does this cost, and who would you go to to have it done?