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7 Series - F01 / F02 (2009 - current)
The new re-designed 7 series F01 / F02 leads off the BMW Fxx chassis code!

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  #1  
Old 08-10-2014, 09:06 PM
dcouryjr dcouryjr is offline
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Turner exhaust sound drone

Just bought an Alpina B7 with a dealership installed Turner exhaust. Absolutely love it, but I get a lot of drone. I've heard that installing Teklite, any undercoating or Dynamat would help. Any suggestions? Start with the trunk area under the mat? Help is much appreciated as I hate the drone in such a nice car.


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  #2  
Old 08-13-2014, 11:32 PM
Bimmer32 Bimmer32 is offline
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Man, drone and custom exhaust (not properly engineered or designed) go hand in hand. The mats might help but it depends on the frequencies that disturbs you. Droning is typically in the 80-90 Hz if I remember correctly. On some cars like Corvettes, it does help. But since I am not familiar with the exhaust system you put in, it is worth a shot. Just saying, the mats is a sound deadening material, but that does not mean it keeps all frequencies out especially the drone ones. At best, you might notice a slight decrease in drone.
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Old 08-14-2014, 10:35 AM
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D.B.V. D.B.V. is offline
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Maybe installing a resonator (mid pipe) might help your issue.
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Old 08-14-2014, 12:55 PM
dcouryjr dcouryjr is offline
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Thanks! Yeah, I'm hearing 2 resonators since I have straight pipes currently. Hopefully I don't lose the great sound too much though! Just the drone. I hear there is a J pipe option too... Dealership won't do either as I bought from another out of state dealer... Looks like it's off to a muffler shop.


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Old 08-14-2014, 12:58 PM
dcouryjr dcouryjr is offline
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The drone is just at 2,000 rpm second gear mainly and only when it loads up. Main problem is the rattling it causes in the dash. Other then that small part it's fine. Annoying.


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Old 08-14-2014, 09:24 PM
Bimmer32 Bimmer32 is offline
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Droning starts at 1800-2200 rpm. If it is vibrating the dash, then neither mats or resonators will help. Your muffler is the biggest factor in droning. The resonators only acts to narrow the droning band. In my 545i, I have two stock resonator, two additional 6" resonators (insulated), and x-pipe (replaced the factory y-pipe), and to cherry bombs as mufflers (essentially insulated resonators), and it drone loud at 1800-200 rpm. When I replaced the two cherry bombs with turbo mufflers from Jones Exhaust, it was a pleasant roar with no droning. The uninsulated turbo mufflers channel exhaust air in the path of an "S" inside a tube effectively cancelling sound but still allow airflow. On second thought, if you add the resonators (make sure they are insulated), you may reduce some of the vibration cause by the drone. But the majority of the drone is coming from your rear mufflers.
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