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

m4a1mustang · 07-29-2010, 10:53 AM

I like this thread. + rep

'10Anamoly · 07-29-2010, 11:18 AM

Thanks for the reps!

vividracing · 07-29-2010, 11:36 AM

nice writeup! thanks for sharing!

Red__Zed · 07-29-2010, 11:56 AM

repped! I was in the process of doing the same thing in my S when I sold it...that drone was freaking killing me...

370Zsteve · 07-29-2010, 12:00 PM

Quote:

Originally Posted by DanGizinski

repped! I was in the process of doing the same thing in my S when I sold it...that drone was freaking killing me...

The drone is really that bad? Damn.......in for updates and hopefully videos when done

+1 rep

Red__Zed · 07-29-2010, 12:15 PM

Quote:

Originally Posted by 370Zsteve

The drone is really that bad? Damn.......in for updates and hopefully videos when done

+1 rep

Different exhaust...I had straight 3 inch piping all the way back. Car sounded like a freaking truck between 2k and 3k.

'10Anamoly · 07-29-2010, 12:28 PM

Thanks again for the support, I'm glad this thread is going over well. Drone is a bit hard to capture on video, (especially since its all gone now) but I can definately post pics of the setup and back it up with a personal guarantee that it cut out 99.999% of the noise around 2500rpms, 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!

fairladyZ34 · 07-29-2010, 01:34 PM

happy women FTW!

Nikon FM · 07-29-2010, 10:24 PM

If there is temperature change in the exhaust due to outside ambient temps the speed of sound will change and the wave length will also be affected.

Frequency=Speed of sound/Wave Length

This may be a non-issue if the exhaust temps are not affected much by the outside temps.

my 2 cents

CrownR426 · 07-30-2010, 10:34 AM

lol... i wonder how much power you lost by doing this mod.

m4a1mustang · 07-30-2010, 10:59 AM

Quote:

Originally Posted by CrownR426

lol... i wonder how much power you lost by doing this mod.

Probably... none.

RCZ · 07-30-2010, 12:30 PM

Awesome job man, makes sense. I guess thats why Stillen chose the muffler setup they did and why my car has 0 drone.

'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!

07-29-2010, 10:53 AM	#1 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6964	I like this thread. + rep __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

07-29-2010, 11:18 AM	#2 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 18	Thanks for the reps! __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

07-29-2010, 11:36 AM	#3 (permalink)
vividracing The370Z.com Sponsor Join Date: Jun 2009 Location: Gilbert, AZ Age: 39 Posts: 7,306 Drives: 350Z,370Z,GTR Rep Power: 41	nice writeup! thanks for sharing! __________________ Rocky @ Vivid ♦ 480.966.3040 x236 ♦ Rocky@vividracing.com Email, PM, or call me directly for aggressive The370Z.com member pricing!!!

07-29-2010, 12:28 PM	#7 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 18	Thanks again for the support, I'm glad this thread is going over well. Drone is a bit hard to capture on video, (especially since its all gone now) but I can definately post pics of the setup and back it up with a personal guarantee that it cut out 99.999% of the noise around 2500rpms, 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! __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd Last edited by '10Anamoly; 07-29-2010 at 12:30 PM.

07-29-2010, 01:34 PM	#8 (permalink)
fairladyZ34 A True Z Fanatic Join Date: Aug 2009 Location: Central NJ Posts: 1,577 Drives: 08 G37S Black M6 Rep Power: 20	happy women FTW! __________________ From Z to G to BMW and back to a G! Nismo for life

07-29-2010, 11:56 AM	#4 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 121	repped! I was in the process of doing the same thing in my S when I sold it...that drone was freaking killing me...

07-29-2010, 10:24 PM	#9 (permalink)
Nikon FM Track Member Join Date: Jan 2009 Location: Snoqualmie WA Posts: 973 Drives: 03 996TT Porsche Rep Power: 608	If there is temperature change in the exhaust due to outside ambient temps the speed of sound will change and the wave length will also be affected. Frequency=Speed of sound/Wave Length This may be a non-issue if the exhaust temps are not affected much by the outside temps. my 2 cents __________________ Buddy Revell: "One man's sooner is another man's later"

07-30-2010, 10:34 AM	#10 (permalink)
CrownR426 A True Z Fanatic Join Date: Nov 2008 Location: South Korea Posts: 4,676 Drives: Manual Rep Power: 849	lol... i wonder how much power you lost by doing this mod. __________________ Love + Hardwork + Passion RIP SVTRacer

07-30-2010, 12:30 PM	#12 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1120	Awesome job man, makes sense. I guess thats why Stillen chose the muffler setup they did and why my car has 0 drone.

08-04-2010, 11:28 AM	#15 (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

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