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

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

Trips · 07-29-2010, 10:43 PM

Quote:

Originally Posted by 370Zsteve

My Berk exhaust makes it's sweetest sound right at the RPMs you specify.

Berk ftw?

Holliday · 07-30-2010, 01:26 AM

Quote:

Originally Posted by Triple's

Play nice you two!

'10Anamoly · 07-30-2010, 10:28 AM

Quote:

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

This is true for the math, but the exhaust temps should be pretty similar despite outside temperatures. Perhaps a bit cooler in the winter but still pretty close. The side branch resonators cover about 15 points of frequency completely and then begin to lose a bit of efficiency. On my car it knocked out all the drone from 2200rpms through 3000rpms. I expect in winter for the car to make a bit more noise but probably not much. Can always report back when its cold outside.

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.

m4a1mustang · 07-30-2010, 01:57 PM

Very nice!

People also need to note that you are using Magnaflow race mufflers and NOT the FI cans.

'10Anamoly · 07-30-2010, 01:59 PM

Yes, these are Magnaflow 4" stainless resonators (what Magnaflow called them on the box) also the same as race mufflers really since the diameter is smaller than 6". I much prefer them to the size of the FI cans from the rear view, although FI is not really bad looking to start with.

fairladyZ34 · 07-30-2010, 02:34 PM

sound clips?

'10Anamoly · 07-30-2010, 05:17 PM

One better, will have a video later tomorrow. We are making it at the TopSpeed grill out meet.

KEVTEX · 07-30-2010, 06:03 PM

Good solid technical info, plus 1 rep. I would have purchased an FI exhaust if it weren't for the drone problem. FI should offer this in their product line. Stillen and Berk avoid drone by having a longer exhaust path.

Highwind · 07-31-2010, 01:04 AM

Isnt this technology called the Hemholtz pipes?

07-29-2010, 01:34 PM	#16 (permalink)
fairladyZ34 A True Z Fanatic Join Date: Aug 2009 Location: Central NJ Posts: 1,577 Drives: 08 G37S Black M6 Rep Power: 18	happy women FTW! __________________ From Z to G to BMW and back to a G! Nismo for life

07-29-2010, 10:24 PM	#17 (permalink)
Nikon FM Track Member Join Date: Jan 2009 Location: Snoqualmie WA Posts: 973 Drives: 03 996TT Porsche Rep Power: 606	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	#21 (permalink)
CrownR426 A True Z Fanatic Join Date: Nov 2008 Location: South Korea Posts: 4,676 Drives: Manual Rep Power: 847	lol... i wonder how much power you lost by doing this mod. __________________ Love + Hardwork + Passion RIP SVTRacer

07-30-2010, 01:57 PM	#25 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	Very nice! People also need to note that you are using Magnaflow race mufflers and NOT the FI cans. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

07-30-2010, 01:59 PM	#26 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 15	Yes, these are Magnaflow 4" stainless resonators (what Magnaflow called them on the box) also the same as race mufflers really since the diameter is smaller than 6". I much prefer them to the size of the FI cans from the rear view, although FI is not really bad looking to start with. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

07-30-2010, 12:30 PM	#23 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1118	Awesome job man, makes sense. I guess thats why Stillen chose the muffler setup they did and why my car has 0 drone.

07-30-2010, 02:34 PM	#27 (permalink)
fairladyZ34 A True Z Fanatic Join Date: Aug 2009 Location: Central NJ Posts: 1,577 Drives: 08 G37S Black M6 Rep Power: 18	sound clips? __________________ From Z to G to BMW and back to a G! Nismo for life

07-30-2010, 05:17 PM	#28 (permalink)
'10Anamoly Track Member Join Date: May 2010 Location: GA Posts: 882 Drives: 2010 370Z BS M6 Rep Power: 15	One better, will have a video later tomorrow. We are making it at the TopSpeed grill out meet. __________________ 2013 Ford Mustang GT 374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

07-30-2010, 06:03 PM	#29 (permalink)
KEVTEX Base Member Join Date: Nov 2009 Location: Montgomery, TX Posts: 119 Drives: 2010 370Z 7at sp pg Rep Power: 15	Good solid technical info, plus 1 rep. I would have purchased an FI exhaust if it weren't for the drone problem. FI should offer this in their product line. Stillen and Berk avoid drone by having a longer exhaust path.

07-31-2010, 01:04 AM	#30 (permalink)
Highwind Base Member Join Date: Oct 2009 Location: IRVINE Posts: 44 Drives: Pearl White 370z Rep Power: 15	Isnt this technology called the Hemholtz pipes?

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