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Old 11-17-2011, 06:02 AM   #18
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Quote:
Originally Posted by Mach View Post
Here is the MRT 2.0 culprit...



This is at around 2150 RPM at 75 MPH on the highway tonight. 28 inch helmholz pipes will solve the 120HZ 83DB drone. I already got my pipes...

http://www.ebay.com/itm/390364088873...S:1123&vxp=mtr

I ordered three of these. I will be installing these sometime next week. Stay tuned....
I'm glad youve got the formula down. I'll be anxiously waiting to see your outcome. I've saved that eBay auction, if all goes well, this is the next step I'll be taking after I finish with what sound dampening material I have left. After paying hundreds for the exhaust itself, I really don't want to buy an x-pipe right now. This will take care of it at low speed as well, right? I think it's the same rpm range but accelerating from a stop.
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Old 11-17-2011, 07:01 AM   #19
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Do you have a spare tire in the lower trunk - battery area? When my spare is in the car the drone wasn't that bad. When I take it out I get more drone. Don't no if this helps at all.
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Old 11-17-2011, 07:06 AM   #20
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Do you have a spare tire in the lower trunk - battery area? When my spare is in the car the drone wasn't that bad. When I take it out I get more drone. Don't no if this helps at all.
Yes, I do. Without the weight of the tire, that bare metal under there could vibrate and cause a droning echo.....at least I assume it would.
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Old 11-18-2011, 07:02 AM   #21
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I'm smiling!

Kill that drone!
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Old 11-18-2011, 09:24 AM   #22
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I'm smiling!

Kill that drone!
Lol, thanks for the encouragement.
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Old 11-18-2011, 11:32 AM   #23
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Has anyone experimented with the resonator?

Awesome thread!
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Old 11-18-2011, 01:22 PM   #24
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Quote:
Originally Posted by Mach View Post
Here is the MRT 2.0 culprit...



This is at around 2150 RPM at 75 MPH on the highway tonight. 28 inch helmholz pipes will solve the 120HZ 83DB drone. I already got my pipes...

http://www.ebay.com/itm/390364088873...S:1123&vxp=mtr

I ordered three of these. I will be installing these sometime next week. Stay tuned....
I will be very interested to see where exactly you run your pipes and how they work out for you. I know when installed correctly and at the right length they can work wonders.
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Old 11-18-2011, 01:26 PM   #25
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Originally Posted by AutoAgenda View Post
Has anyone experimented with the resonator?

Awesome thread!
This is the response I got from another member who tried it:

"honestly I think it made the drone in the low rpms even more noticiable. The resenator delete gave the exhaust a meaner louder more aggressive sound but it does come at a price. Hope this helps!"
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Old 11-18-2011, 03:07 PM   #26
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Quote:
Originally Posted by Saint Alban View Post
This is the response I got from another member who tried it:

"honestly I think it made the drone in the low rpms even more noticiable. The resenator delete gave the exhaust a meaner louder more aggressive sound but it does come at a price. Hope this helps!"
Need a resonator one way or the other
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Old 11-18-2011, 03:12 PM   #27
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Need a resonator one way or the other
Well, yea, that was just in response to some members suggestions on doing a resonator delete.
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Old 11-19-2011, 09:08 AM   #28
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I'm having the same problem with my SS. I just installed a full kooks exhaust system and it drones. I hope the trunk sound deadening works. Im going to go that route if it works for you.
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Old 11-19-2011, 05:58 PM   #29
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I'm having the same problem with my SS. I just installed a full kooks exhaust system and it drones. I hope the trunk sound deadening works. Im going to go that route if it works for you.
I pretty much finished the sound deadening mats today, but I'm putting sound absorbing foam on top of that tomorrow, it got too cold to continue today. I dont expect it to fully kill the problem but it should help and make my sound system better, which is why I started in the first place. I'm waiting for "Mach" to do his Helmoltz pipe. That's the solution I've got my money on. If you'd like to do the sound deadening though, I'd recommend using RaamAudio.com. I bought FatMat before I heard about them. I got the peel and stick foam from Raam. If I would've known, I wouldve just dealt with them.
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Old 11-23-2011, 07:22 AM   #30
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I finished the sound dampening over the weekend, but haven't driven much since then due to all the rain we've been having. I drove it a little after I was finished though and it seems like it helped some. Not by a huge noticeable difference. If you're gonna sound dampen for exhaust drone, I'd say you'd have to get your entire car done (i only did from the back seats to the trunk) to see a drastic change. Maybe i didnt use the best material though. Seems to me you'd have to dampen so much that there is no longer any outside noise whatsoever coming into the cabin. Ive seen a thread where this has been done (i think its titled "a little bump in my trunk"). So you'd have to do a lot more than what I did, which could get expensive. Again, it's not so much the sound, but the vibration the drone makes at the frequency it's in. The helmholtz pipe should cancel out that frequency. Gonna do that once I get confirmation that it worked.
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Old 11-23-2011, 07:32 AM   #31
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How much weight do you think you added to the car?
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Old 11-23-2011, 08:00 AM   #32
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Quote:
Originally Posted by Mach View Post
Here is the MRT 2.0 culprit...



This is at around 2150 RPM at 75 MPH on the highway tonight. 28 inch helmholz pipes will solve the 120HZ 83DB drone. I already got my pipes...

http://www.ebay.com/itm/390364088873...S:1123&vxp=mtr

I ordered three of these. I will be installing these sometime next week. Stay tuned....
Any updates ? I've already installed the fatmat but that really didn't do much .. made the stereo sound better but nothing for drone .

I'll subscribe and keep checking back .
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Old 11-23-2011, 08:46 AM   #33
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How much weight do you think you added to the car?
The FatMat according to shipping confirmation was 8 lbs. The ensolite foam was 4 lbs. Plus I got more FatMat but it was thinner and a smaller amount so I'd say another 4 lbs. So 16 lbs. I believe the stock exhausts were about 35 lbs. and the MRTs are 18 all together.

-35 + 18 = -17 + 16 = -1
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Old 11-23-2011, 08:48 AM   #34
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Any updates ? I've already installed the fatmat but that really didn't do much .. made the stereo sound better but nothing for drone .

I'll subscribe and keep checking back .
If all goes well, Mach is supposed to be trying it today.
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