what is exhaust drone?
12-22-2009, 02:38 PM
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My Ride: 2004 530i, Alpine white, M-Tech Kit, 20" Asanti af-128 rims, Roof painted Black.
I've heard it metioned before about how some exhaust systems drone. What is drone? is it a certin sound given off by exhaust? If you could answer it would be greatly appreciated.
Yes i used the search bar and found alot of info but none of it is really helping me, i am only asking this because my next mod is selling my exhaust and getting a custom quad setup with mtech quad diffusor.
Yes i used the search bar and found alot of info but none of it is really helping me, i am only asking this because my next mod is selling my exhaust and getting a custom quad setup with mtech quad diffusor.
12-22-2009, 03:28 PM
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Originally Posted by mikes 5' post='1078523' date='Dec 22 2009, 07:38 PM
I've heard it metioned before about how some exhaust systems drone. What is drone? is it a certin sound given off by exhaust? If you could answer it would be greatly appreciated.
Yes i used the search bar and found alot of info but none of it is really helping me, i am only asking this because my next mod is selling my exhaust and getting a custom quad setup with mtech quad diffusor.
Yes i used the search bar and found alot of info but none of it is really helping me, i am only asking this because my next mod is selling my exhaust and getting a custom quad setup with mtech quad diffusor.
12-22-2009, 03:34 PM
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Exhaust drone occurs when the harmonics of the exaust match the harmonic frequency of the cabin in the car. This drone usually occurs in a certain RPM range. It causes the entire cabin to feel like it's vibrating and it feels like your head vibrates a little. Drone is pretty common when upgrading to a louder performance exhaust. The RPi exhaust for my 545i had some drone but the drone was basically gone after 1000 miles. On cheap exhausts, the drone will actually get worse because the glass packs get burnt off. On the RPi exhaust, the fiberglass packs get nice and packed in which reduces the drone after time...1500-2500 RPM is the most common harmonic frequency in our cars it seems. The stock muffler is designed to muffle the drone or is designed in such a way to have the drone at a RPM that the car can not achieve...say your redline is 6500rpm, designers would design the exhaust to drone at 7500rpm. Drone is very difficult to get rid of because unlike sound, which can be baffled, drone is caused by harmonic frequencies that are more difficult to alter. One solution is an exhaust cone which installed where the stock exhaust is cut, another solution is a ring which just installs in the exhaust tips....RPi offers these 
12-23-2009, 05:21 AM
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Originally Posted by Krozi' post='1078554' date='Dec 22 2009, 07:34 PM
Exhaust drone occurs when the harmonics of the exaust match the harmonic frequency of the cabin in the car. This drone usually occurs in a certain RPM range. It causes the entire cabin to feel like it's vibrating and it feels like your head vibrates a little. Drone is pretty common when upgrading to a louder performance exhaust. The RPi exhaust for my 545i had some drone but the drone was basically gone after 1000 miles. On cheap exhausts, the drone will actually get worse because the glass packs get burnt off. On the RPi exhaust, the fiberglass packs get nice and packed in which reduces the drone after time...1500-2500 RPM is the most common harmonic frequency in our cars it seems. The stock muffler is designed to muffle the drone or is designed in such a way to have the drone at a RPM that the car can not achieve...say your redline is 6500rpm, designers would design the exhaust to drone at 7500rpm. Drone is very difficult to get rid of because unlike sound, which can be baffled, drone is caused by harmonic frequencies that are more difficult to alter. One solution is an exhaust cone which installed where the stock exhaust is cut, another solution is a ring which just installs in the exhaust tips....RPi offers these
12-23-2009, 05:21 AM
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Originally Posted by ericdiver' post='1078547' date='Dec 22 2009, 07:28 PM
I have a post with my magnaflow sound clip on here , drone is like some 16 year kid with rap music as loud as you can make it with only subs pointed at ur head-- any aftermarket exhaust will have some between 1000-1500rpm I drive a stick so I can somewhat control it but if I lug the motor I will be droned to death
12-23-2009, 08:07 PM
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My Ride: Numero Uno in Richmond Va 04 530 6 speed, jet black, black dakota leather, xenons, red rear reflectors, 545 front grill, cold weather package, premium package, staggered 19 inch BBS rxII/michelins, H&R coilovers and intergrated, R1 concept drilled an
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can I have your slightly used rpi when you get your quad no need of throwing it away. Merry Christmas
12-23-2009, 08:43 PM
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My Ride: 2007 530i. Purchased 6/28/07. Titanium Silver Metallic, Black Dakota Leather, Dark Poplar Trim, Steptronic, Premium Package, Cold Weather Package, Bluetooth, Adaptive Control Xenons. 10/30/07 Added OEM 124s with 245/40/18 & 275/35/18 Michelin Pilot Sport A/S tires. Installed red Cal Covers� from BavAuto. 11/21/07 Added OEM all-weather floor mats (for winter, carpet in summer) and coat rack. 6/26/08 installed M5-style rear spoiler. 6/30/08 put on red reflectors. 8/22/08 Euro turn signal stickers applied. 3/20/09 Installed Shadowline Trim. 3/27/09 Added Matte Black Kidney Grilles from Trinity. 4/03/09 Installed Bimmian Shadow Matte Black 530i Badges. 4/04/09 Installed LED license plate lights from Trinity. 5/01/09 Installed Brabus Interior LED Kit and White Angel Eyes. 5/02/09 Put in Brabus 6K Fogs. 5/14/09 Removed charcoal filter. 5/15/09 Installed light smoke LED side marker lamps from Trinity. 5/21/09 Sprint Booster. 6/12/09 Painted exhaust tips flat black. 6/13/09 Pulled red Cal Covers and painted calipers low gloss black. 6/27/09 RPI Ram Air Scoop from Trinity. 8/15/09 Installed Brabus's silver invisibulbs front and rear. 9/24/09 Installed R-Dash license plate LEDs from Brabaus (John).
In juxtaposition to Marc's erudite audiophile response, I would just say it sounds a bit like the infamous "Brown Noise" on South Park . 
http://www.southparkstudios.com/guide/317/
http://www.southparkstudios.com/guide/317/
12-24-2009, 05:23 AM
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Originally Posted by CWS530' post='1079221' date='Dec 24 2009, 12:43 AM
In juxtaposition to Marc's erudite audiophile response, I would just say it sounds a bit like the infamous "Brown Noise" on South Park .
