sounds like a good deal, after you laid the dynomat down, the carpets still fit properly in the back in the wheel wells? Also you refer to the tub, you're referring to under the hatch the trunk area true? When I think of the tub, I think of a c5

 

Great write up.

I applied dynamat to my entire car. I even applied dynamat outside my car beneath the trunk pan bottom and mufflers. Also between the rear wall behind the passenger seat and gas tank.

I want to use "ensolite, 100%".
What all should I cover using the ensolite? This stuff looks pretty thick.
Can you give more information on the ensolite product?
a) Supplier name to purchase
b) appox cost
c) Which areas of the car did you cover below?
1) Doors
......... inner door attached to outer surface of door.
......... inner door between plastic door panel and door frame.
......... Just behind the woofer and tweeter speaker in the door.
2) Interior
------- remove seats under carpet
......... Rear compartment trunk area
......... Area behind seats
......... Under floor mats
......... Side panels behind seats
......... behind rear side speakers
......... Any place I missed?

d) Do you apply on top on the dynamat.

Thanks for you help in advance.

 

The corsa exhaust is essentially multiple length j pipes. J pipes work by creating a reverse sound wave that cancels out the drone. Most people have them adjustable so they tune out the drone at a specific frequency (usually at cruising speed). If you have a corsa you effectively have a j pipe built into the muffler but it cancels out a much wider frequency band. Check out this link to a great writeup about j pipes.

http://ls1tech.com/forums/cadillac-cts-v/1629371-cure-drone-1-4-resonance-pipes-aka-j-pipes-aka-helmholtz-tubes.html


The other thing to think about is do you want the car quieter or do you want to get rid of the droan. Droan can be reduced with j pipe/corsa exhaust and to a lesser extent with dynamat. Total reduction in sound volume will be conducted with the different insulation products out there.

 

Wow, I just hit a button and presto, all's good
NSF

 

The carpets still fit - a little bit of work to make sure everything is smoothed out properly, but i don't remember having to remove any dynamat or carpet padding to get a good fit.

The tub for me is the the floor/sides/wheel well of the hatch area. Big, boomy, plasticky panels.

 

thanks. any gòod leads as where to purchase please ?
now is the time instead of spring. not going anywhere soon at -20

 

How did you apply the ensolite and dynamat to doors.

Inner door attached to outer surface of door?
Inner door between plastic door panel and door frame?
Just behind the woofer and tweeter speaker in the door?

 

I have been fighting the drone too. Its love/hate. My Borla S-type that was installed by the previous owner on my 08 sounds beautiful, but becomes annoying on long trips or if you want to talk to someone, use the phone, etc. Everything I did really didn't help (like someone here told me). I put dynamat over 50% of the rear, then used mass loaded vinal a guy gave me who is a sound engineer. I didnt' want to add much weight so it was a balance. Maybe 20 lbs. Have Loyd mats too. And I did the heat insulation kit to the front.
Then I got the B&B x-pipe with resonators, no real change.
I'm almost ready to get a NPP, I don't know. But my car was dyno-tuned with the K&N intake and this exhaust, 400 rwhp, and it runs real sweet. NPP is much heavier too.

So I'd be interested if someone DOES add a helmholtz resonator, which is like adding a stub pipe at 90 degrees from the main, how it fits, what it costs, etc.

 

The only time the drone bothers me is on a long trip,installed a wild to mild and problem solved.

 

I guess headers are out for your car.....
Corvette is a performance car if its too loud and you need to reduce the noise of the exhaust etc. by placing diapers all over it etc. then you may want to consider a prius it has zero drone ..

 

funny guy

 

Or...I'm confident enough in my dick size that I don't constantly need a loud car. I can have my mufflers open when I choose, and drive silently when I choose.

 

What if it's really short but as big around as a beer can?

 

Sounds like you have really attacked the problem.

I had a 2010 370Z. The Z has a real problem with road noise, I swear you could hear every pebble and grain of road grit pinging off the chassis and conducting a conversation on most concrete roads was near impossible.

I did 100% Dynamat on the doors, floors, wheel wells, hatch area floor & walls. I did 50% coverage on the tunnel and lower firewall and I applied spray-on undercoat on the rear fender liners. I applied Luxury Liner Pro sound absorbing foam mats on the hatch floor and wheel wells. I also installed a layer of indoor-outdoor carpet between the Luxury Liner Pro and the factory carpet. As a last measure I stuffed any voids with polyester fiber filler. The interior environment was a much nicer place to be. You could actually enjoy the sound system and conduct a conversation. My phone-app db meter showed a 3+db reduction in sound levels. 3db is actually a big drop and the sound that you did hear was not annoying like the untreated interior. The completed Z had a similar noise environment to my stock 2011 GS with the NPP in the quiet mode. I spent a little over $300, invested about two to three weekends of my time and added about 60 pounds (ouch!) to the car. The Dynamat was responsible for perhaps two-thirds of the improvement and about 40% of the weight. If I was to do it all over again I'd probably do everything but the Luxury Liner Pro. LLP is a great product but it is heavy and the Dynamat was effective enough that the LLP didn't make enough difference to warrant the time, weight and expense. LLP, like similar products, is also thick so it complicates the reinstalation of the interior trim. The Z has a very noisy hatch area so doubling up on the Dynamat in that area is also lighter, lower cost and easier to apply alternative to LLP. The additional weight was ever so slightly noticeable when making abrupt changes in direction, just one more thing to consider.

If you want to get a sense of what can be achieved get a free db meter app for your smart phone and do a before and after test over the same road at the same speed. For the first test take the car as is and for the second test jamb pillows, blankets, cushions or whatever into the passenger foot well and hatch/trunk area and retest. That will give you a sense of what noise reduction might be achieved by taking it to the next level of noise reduction. I suspect you've got a lot of work ahead of you if you goal is a luxury GT type environment. If this is all about drone reduction I'd concentrate on the exhaust system where the drone actually is being created. It takes massive amounts of sound deadener to suppress exhaust drone. Dealing with drone with sound deadener is a bit like closing the door after the horse has left the barn.

Just my experience for what it's worth.

 

I have a '13 A6 with a set of Pfadt LT headers and midpipe and a set of B&B PRT mufflers. The car is quite loud, when I want it to be.

Prior to installing the mufflers, I put down 2 layers of material throughout the entire vehicle when I installed my sound system:

layer 1: Damplifier Pro
http://store.secondskinaudio.com/vibration-dampers-cld/

this will kill any vibration that the panels of the car experience due to the road as well as the exhaust.

layer 2: Luxury Liner Pro
http://store.secondskinaudio.com/mlv-noise-barriers/

this will absorb any noise coming into the car that isn't caused by the body panels vibrating. It will also kill your tire noise, etc.

The interior of the car is drone free at all speeds, provided that I'm not applying excessive throttle. Cruising on the interstate anywhere between 60-85 is pretty much silent. You'll hear it a little if I'm going up a hill and want to maintain speed, but under all other circumstances it's fine. I can easily mute the radio, passengers, and emergency vehicles by going past 50% throttle, though.

I'm not saying you'll have the same results; from what I understand, B&B did quite a bit of research on their Purge Resonance Technology which makes the car much quieter at lower RPM's. For all I know, this may be a Helmholtz resonator built into the muffler. There aren't any external resonators on this system.

sorry for rambling a bit.

 

We redesigned our S-Type for the C6 and tuned out the drone. It's called the "S-Type II". Give me a call at 805.246.6067 or send me an email to davidb@borla.com and I will find a solution.

 

Seems to me that we have 2 separate problems sort of being lumped into one discussion. As Guard Dad said is it the DRONE or the ROAD NOISE??
The drone is from the exhaust right ??
Cabin or road noise is the other right ??
I will say this, I have learned from this, that I will never give up my NPP exhaust, best of both worlds !!
Cabin/road noise seems pretty intensive fix to me. Like re-inventing the wheel. I'll live with it.
NSF

 

One thing to keep in mind is that you do not need NPP to tune out drone. A properly designed and tuned exhaust system will not drone regardless of NPP. The reason we like NPP is because it allows you to change the exhaust note from quiet to aggressive with a switch/dial.

 

I agree 100%.

The NPP is having your cake and eating it too. Quiet when you are logging miles and rowdy when you are feelin' the need.

 

Reducing road noise will reduce drone somewhat but a bad case of drone will overwhelm just about any reasonable sound deadener installation. Just my opinion, but I believe that drone is best resolved within the design of the exhaust system not through the application of 100 pounds of sound suppressing materials. For me, in the future, about 30 pounds of deadener is the limit that I would be adding to any car. If more is needed I'll be looking at other options.