Best way to reduce drone at 1700-1900 RPM? - TundraTalk.net - Toyota Tundra Discussion Forum
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post #1 of 17 (permalink) Old 02-16-2017, 01:00 PM Thread Starter
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Best way to reduce drone at 1700-1900 RPM?

I just bought a used Crewmax 4x4 5.7L, which already had a dual exhaust system. It has a tiny Flowmaster muffler about a foot before the rear axle. At 1700-1900 RPM, the sound and vibration is very intense (at least 120 db) inside the cabin. Once it goes above 2k RPM, its gets quiet. I absolutely love this truck, but the sound is driving me crazy after just a few days of ownership. The tips stick protrude 2" beyond the rear bumper.

I've been looking on the forums to see what people do to reduce the noise, and found the following solutions:
1. Add weight to the pipes after the muffler. This can be done by welding on some heavy bars or clamping on 10 lbs
2. Install Dynamat sound dampener to the floorboard.
3. Replace the exhaust system with another system. Potentially find someone to trade with
4. Cut or bolt on different pieces to "tune" the system. This one seems easy. Perhaps, I can just put a bigger muffler on the existing system, or add a J-pipe resonator.

Here are some photos. I'd love to get rid of the crazy resonance and vibration, but keep it sounding mean when I start it and really gas it. I don't want to pay a bunch of money, but it's my daily driver, so I'll do what's needed. I'd really appreciate any ideas, links, etc. that can help me out.
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post #2 of 17 (permalink) Old 02-16-2017, 01:27 PM
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You can make a Helmholtz resonator from a 26" long piece of 2" pipe. One side of this pipe is open, the other side capped off. Cut a hole in the passengers side tailpipe and attach the open side of the resonator into the hole in a "T" style joint. The resonator should be located between the spare tire and axle housing.

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post #3 of 17 (permalink) Old 02-16-2017, 01:33 PM
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Put some resonators.
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post #4 of 17 (permalink) Old 02-16-2017, 01:52 PM Thread Starter
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Originally Posted by Mr. Creosote View Post
You can make a Helmholtz resonator from a 26" long piece of 2" pipe. One side of this pipe is open, the other side capped off. Cut a hole in the passengers side tailpipe and attach the open side of the resonator into the hole in a "T" style joint. The resonator should be located between the spare tire and axle housing.
That sounds like something a muffler shop could do pretty easily. Will tapping into just the passenger side pipe change the resonance of both pipes?
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post #5 of 17 (permalink) Old 02-16-2017, 05:47 PM
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post #6 of 17 (permalink) Old 02-16-2017, 06:09 PM
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J pipe (Helmholtz resonator) is the way to go. Someone on here makes them I beleive.

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post #7 of 17 (permalink) Old 02-16-2017, 06:11 PM Thread Starter
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So, this morning, I went to a very highly rated local muffler shop and talked to the owner. He said it would be easier and better to just remove the Flowmaster 10 and install a large Magnaflow (dual in/out) muffler. He says the Magnaflow has an internal crossing of the pipes which decreases the sound. He quoted $240 to remove the Flowmaster and install the Magnaflow. Does this sound legit?

This is the one he proposed installing: http://www.magnaflow.com/products?partNumber=12568

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post #8 of 17 (permalink) Old 02-16-2017, 07:36 PM
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The passenger side pipe is droning, the driver's side is not. A 26" piece of pipe will be a bit cheaper than $240.

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post #9 of 17 (permalink) Old 02-16-2017, 08:00 PM
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Originally Posted by Mr. Creosote View Post
The passenger side pipe is droning, the driver's side is not. A 26" piece of pipe will be a bit cheaper than $240.
What @Mr. Creosote said sounds reasonable.

Respected muffler shop wants to make some quick cash. Bigger cash than 26" of pipe.

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post #10 of 17 (permalink) Old 02-16-2017, 10:57 PM
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There's a lot more issues with this system. Just a helmholtz won't fix them.

The pipe diameter is too big. The muffler design inherently drones. And all of those exhaust leaks.

If you're not supercharged, and not running long tube headers, you're losing a lot of low end torque with a dual exhaust.

The best solution for your situation (if not supercharged or tinkly long tube headers) is to run our 6" system and tie it back to a stock tailpipe with helmholtz resonator installed.

Give a call with any questions. And check our some of the cool stuff we make.

DIRTY DEEDS INDUSTRIES ? Performance Sound without the Drone
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post #11 of 17 (permalink) Old 02-17-2017, 12:00 AM
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post #12 of 17 (permalink) Old 02-17-2017, 02:18 AM
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^ this guy knows his stuff ^
I concur..

The shop that installed that drone master also cut off your rear bolt ons.

I have a BA 7 inch single out and I love it.

You can get a new rear pipe from Roman @ToyotaOfCoolSprings

https://parts.toyotaofcoolsprings.co...bC12OC1nYXM%3D

I had to buy a new rear pipe after a local muffler shop butchered my pipes installing a Magnaflow that had the drone from hell.



I then found this forum and BA mufflers and Keith @dirtydeeds saved me.



@shepdawg call Keith at BA mufflers and discuss your wants and needs.
He will recommend what he feels will work best for you, I think a 6" or 8" BA muffler with his Helmholtz resonator.
If you order another single out stock tailpipe (a little over $200) and a BA system, I think you'll get the sound you want with very little, if any, drone.
Above all else, you need to ditch that Flowmaster..

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post #13 of 17 (permalink) Old 02-17-2017, 07:45 AM
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I got away from the duels a long time ago for the above reasons and drone. Not all FM mufflers drone but the one you picked is not much a muffler. I have the same truck and did a muffler swap from the stock with a FM Super 50 and am nothing but happy with the deep rumble and no drone.

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post #14 of 17 (permalink) Old 02-17-2017, 01:56 PM Thread Starter
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There's a lot more issues with this system. Just a helmholtz won't fix them.
Give a call with any questions. And check our some of the cool stuff we make.
I left you a message. Thanks.
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post #15 of 17 (permalink) Old 02-18-2017, 12:19 PM
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How do ya like the 8" system so far?
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