Fancy Tech: How to Get Rid of Exhaust Drone, works great!

'10Anamoly · 07-30-2010, 01:55 PM

Yep, absolutely zero power loss guaranteed (I can attest). The side branches are capped so there is no flow through them really (they are also at 90 degrees from the direction of flow and they are right near the exhaust tips.)

Pics are attached. The black is a 2000* flat black ceramic paint. I covered the whole rear bumper and the tips and mufflers and coated the side branch pipes and connections to the exhaust tips slowly with quick spritzes of paint. Much cleaner looking and no risk of rust. In the last pic, the exhaust tip is about one inch to the right of the black pipe.

docaam · 08-04-2010, 02:39 AM

Quote:

Originally Posted by '10Anamoly

Drone is the head pulsing vibration inside the cabin that gives people nasty headaches and hurts your ears if its too loud. If you like that, more power to you!

If you dont, thats why I wrote the article.

Quote:

Originally Posted by '10Anamoly

and I'm not joking that the drone was BAD. My lady was riding in the car and loved the exhaust until we were cruising at 70mph on the highway and our heads were being microwaved by the drone and vibration. Cant wait to show her its gone when I get home!

I love my FI 18" Resonator catback but I can't agree with you more, I feel this is not the drone but vibration which literally shakes my car long with my head for a certain rpms which you mentioned, apart from that this thing is amazing.

I have to drive a distance of 90miles on motorway and 70mph cruise this drone/vibration/sounds is annoying.

I was told by someone if I can fix two flex pipes on the far most end near stock cats it can kill this thing, as our FI exhausts doesn't comes with flexpipes. Check with Tony as well and he was very cooperative as usual, but my problem comes I live quiet far so to get flex pipes shipped and get those TIG welded was an issue.

Quote:

Originally Posted by '10Anamoly

Pics are attached. The black is a 2000* flat black ceramic paint. I covered the whole rear bumper and the tips and mufflers and coated the side branch pipes and connections to the exhaust tips slowly with quick spritzes of paint. Much cleaner looking and no risk of rust. In the last pic, the exhaust tip is about one inch to the right of the black pipe.

Man thanks for the pics, I am a bit nobb in these frequency and size things. Would it kill this sound if I just attached something between these two tips or the size of the pipe has really a big importance and what kind of welding did you use?

'10Anamoly · 08-04-2010, 11:28 AM

It really should not be the lack of flex pipes causing the drone, it has to do with standing wavelengths through long pipes. The length does matter a lot, what you need to know is the frequency of the drone. It should be close to what mine was.

Is the drone on your car heaviest between 2200rpms and 2800rpms? If so, you need around a 28" side branch resonator on each side, coming at a 90* angle off the area between the tips and the rear mufflers. That will kill off most of the drone. I had a local shop with a good welder make them for me for $100 and then I coated them in 2000* high temp flat black paint. They are tucked up behind the muffler so you cannot see them. Make sure to cover your rear bumper and the car undersides before you paint anything so you dont get spray paint on your paint job!

'10Anamoly · 08-04-2010, 11:41 AM

Here is the video of my setup with the side branch resonators and custom exhaust:

'10Anamoly's 2010 370Z - OEM Intakes, FI X-Pipe, OEM Resonators, Magnaflow 4" Race Mufflers, Side Branch Resonators, OEM Tips (1080P Available)

docaam · 08-04-2010, 12:21 PM

Quote:

Originally Posted by '10Anamoly

It really should not be the lack of flex pipes causing the drone, it has to do with standing wavelengths through long pipes. The length does matter a lot, what you need to know is the frequency of the drone. It should be close to what mine was.

Is the drone on your car heaviest between 2200rpms and 2800rpms? If so, you need around a 28" side branch resonator on each side, coming at a 90* angle off the area between the tips and the rear mufflers. That will kill off most of the drone. I had a local shop with a good welder make them for me for $100 and then I coated them in 2000* high temp flat black paint. They are tucked up behind the muffler so you cannot see them. Make sure to cover your rear bumper and the car undersides before you paint anything so you dont get spray paint on your paint job!

I have seen usually majority of aftermarket CBs are with flex pipes and someone said that this vibration might die with flex pipes

Anyways thanks for the reply, so 28" is the length of each pipe right and im not wrong then I should just weld these to the pipe behind the top without any hole or anything and then weld both of these pipe one behind the other right?

What should be the pipe diameter 2.5"???

For vibration I exactly havent noticed at what rpm it comes on, when you push the car hard it comes a bit early otherwise a bit late but within your mentioned range

08-04-2010, 11:28 AM	#3 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 18	It really should not be the lack of flex pipes causing the drone, it has to do with standing wavelengths through long pipes. The length does matter a lot, what you need to know is the frequency of the drone. It should be close to what mine was. Is the drone on your car heaviest between 2200rpms and 2800rpms? If so, you need around a 28" side branch resonator on each side, coming at a 90* angle off the area between the tips and the rear mufflers. That will kill off most of the drone. I had a local shop with a good welder make them for me for $100 and then I coated them in 2000* high temp flat black paint. They are tucked up behind the muffler so you cannot see them. Make sure to cover your rear bumper and the car undersides before you paint anything so you dont get spray paint on your paint job! __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

08-04-2010, 11:41 AM	#4 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 18	Here is the video of my setup with the side branch resonators and custom exhaust: '10Anamoly's 2010 370Z - OEM Intakes, FI X-Pipe, OEM Resonators, Magnaflow 4" Race Mufflers, Side Branch Resonators, OEM Tips (1080P Available) __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

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