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      01-12-2008, 09:47 PM   #1
sejoon85
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Exhaust drone

For all the experts out there, what is DRONE? After installing an aftermarket exhaust, does drone refer to the Buzzing noise?

I just installed an exhaust, and I do have a buzzing noise coming somewhere below the rear seats, and it happens right around 1.5 rpm to 1.8 ish. Im just wondering if this is what people call DRONE or if its just something that touching the pipes when they vibrate.

Thanks in advance
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      01-12-2008, 09:53 PM   #2
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A Drone is a humanoid that has been assimilated by the Borg.

Hahaha J/K it refers to a lower frequency sound that gets amplified by the exhaust system's various frequencies phase matching.
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      01-12-2008, 10:23 PM   #3
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Sounds like what you have is something rattling from your description, which can be caused by drone sometimes.

Drone is just a constant loud, obnoxious HMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM when you are just cruising. Its pretty easy to tell if an exhaust drones or not. Its the same constant low bass tone that is relentless when you are cruising.
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      01-12-2008, 10:34 PM   #4
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Like everyone said above.

However, a buzz could also be a natural consequence of a certain exhaust design.

If you're wondering if this is just how this exhaust is or if there is some shielding mounting problem or something, my advice would be to sound sample it and trade with the manufacturer and others who own the same equipment to see.

Also, changing out some portions of the complete exhaust path could create buzzing (and droning) in parts that previously were near quiet.
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      01-12-2008, 11:06 PM   #5
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When you say cruising, does that mean around 50km ~ 80km?

Cause I do have a low bass exhaust note around the speed limit speed, but it does not happen when I give it more gas.

Hmmm
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      01-13-2008, 12:11 AM   #6
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Quote:
Originally Posted by sejoon85 View Post
When you say cruising, does that mean around 50km ~ 80km?

Cause I do have a low bass exhaust note around the speed limit speed, but it does not happen when I give it more gas.

Hmmm
I think most droning occur between 2000 and 3000RPM's on 335i's under slight load. Usually goes away when you let off the gas or increase RPM's.
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      01-13-2008, 12:35 AM   #7
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Quote:
Originally Posted by sejoon85 View Post
When you say cruising, does that mean around 50km ~ 80km?

Cause I do have a low bass exhaust note around the speed limit speed, but it does not happen when I give it more gas.

Hmmm
yea it may not be ur exhaust, check the rear passengers center tray (the black one located in between the rear seats) It tends to rattle like crazy from those exact RPMs... its a factory recall now though, so u can go to the dealer, explain the issue, and they will reline it in felt for free
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      01-13-2008, 12:55 AM   #8
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Originally Posted by BoLaS View Post
yea it may not be ur exhaust, check the rear passengers center tray (the black one located in between the rear seats) It tends to rattle like crazy from those exact RPMs... its a factory recall now though, so u can go to the dealer, explain the issue, and they will reline it in felt for free
BoLaS, the center tray rattle issue is a recall item?
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      01-13-2008, 01:54 AM   #9
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Originally Posted by e92phreak View Post
BoLaS, the center tray rattle issue is a recall item?
yep... thats what I heard apparently it was rattling even with the stock exhaust. Just take it to the dealer and they line it up with some black felt... noise gone
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      01-13-2008, 02:21 AM   #10
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Quote:
Originally Posted by BoLaS View Post
yea it may not be ur exhaust, check the rear passengers center tray (the black one located in between the rear seats) It tends to rattle like crazy from those exact RPMs... its a factory recall now though, so u can go to the dealer, explain the issue, and they will reline it in felt for free
Just found out on my way home that centre tray was the reason behind the rattle noise that I had. And now thanks to you, I know that I can go back to the dealer and have that fixed. Thanks
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      01-13-2008, 02:32 AM   #11
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Quote:
Originally Posted by BoostedBMW View Post
Sounds like what you have is something rattling from your description, which can be caused by drone sometimes.

Drone is just a constant loud, obnoxious HMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM when you are just cruising. Its pretty easy to tell if an exhaust drones or not. Its the same constant low bass tone that is relentless when you are cruising.
+1. It's what you get in an aftermarket exhaust for most Japanese cars, hehe.
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      01-13-2008, 02:53 AM   #12
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Quote:
Originally Posted by sejoon85 View Post
Just found out on my way home that centre tray was the reason behind the rattle noise that I had. And now thanks to you, I know that I can go back to the dealer and have that fixed. Thanks
Let me know how it goes with the dealer, my exhaust sometimes makes the tray buzz too. But it happens only after I installed my exhaust, so I just want to know whether the dealer will still do it for you .
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      01-13-2008, 11:50 AM   #13
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I keep that try open now to get away from the sound. I have stock exhaust w/ golf tee mod and will drone a bit at certain rpms.
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      01-13-2008, 08:23 PM   #14
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Quote:
Originally Posted by sejoon85 View Post
Just found out on my way home that centre tray was the reason behind the rattle noise that I had. And now thanks to you, I know that I can go back to the dealer and have that fixed. Thanks
thats great!!! Im glad I could help... yea that thing was rattling after my golf tee mod, imagine now after my exhaust!! Anyway its not an 'official' recall, but BMWNA is aware of it and when u take it the dealer they will fix it
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      01-18-2008, 03:42 AM   #15
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Drone is a resonance between the exhaust note at a set range (usually 2300-3000rpm range) and the chassis/cabin. The best analogy I've heard to explain it is the effect of blowing across the lip of a glass bottle, where at the right angle you get that deep vibration and heavy, resonating sound.

I have some serious drone issues with the full (sect 1-3) Eisenmann Race set-up. It's nasty loud at cold start-up (as if completely un-muffled), but the volume subsides as the engine warms up,. However, it still 'drones' in the above mentioned range. It's as if the entire car resonates the note of the exhaust, and it's quiet oppressive when carrying on a conversation at cruising rpm ranges. With my exhaust, the amazing note produced under high revs has outweighed the drone issue, but a droning exhaust is a serious detractor to the overall enjoyment of any exhaust.

Best advice: experience any exhaust that you consider 1st hand. Either by forum-member exhibit or local representative. The video/audio clips found on forums, either provided by customer or manufacturer, are utter worthless. Recording conditions can easily misrepresent the product by either accident or intention, so actual experience is the only valid reference.
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      01-18-2008, 10:39 AM   #16
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Quote:
Originally Posted by sambonator View Post
it refers to a lower frequency sound that gets amplified by the exhaust system's various frequencies phase matching.
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