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2010 2011 BMW 5 Series Forum F10 Inexpensive Quad Exhaust Project |
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08-15-2015, 06:59 PM | #23 |
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Once I figure out what exhaust I want to build im gonna have to get that... looks much better!
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08-18-2015, 06:53 PM | #24 |
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Thanks all for the comments. I ordered 2 Vibrant 1792 bottle style resonator that I will put in the mid pipe to reduce cold start noise and hopefully some of the drone otherwise I really enjoy the exhaust most of the time.
If the resonators does not cut enough drone for me I might try 1/4 wavelength resonators (branch resonators) to cut the drone). Last edited by Jayphil; 08-18-2015 at 07:08 PM.. |
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08-27-2015, 11:49 AM | #25 |
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I have still not receive the resonators but I did some measurement / calculation to prepare my self for 1/4 resonators if the vibrant resonator does not help enough.
Based on my calculation at 1900 RPM 3 pulse/REV for a I6 Speed of sound of 343 m/s The drone frequency should be at 95HZ and require 35,5" of 1/4 resonator piping. I have used Iphone RTA application (ETANI) and my real life highway measurement was that the 95HZ-100HZ frequency was the peak in DCB (73dcb) which is about 10-12 dcb highier than the other peak frequencies so that is confirming my calculation were correct. I am eager to see if the vibrant resonator will reduce the dcb of the 95hz-100hz frequency enough for me or if I will need the 1/4 wave. For those who are wondering 10dcb increase is perceive by human of between twice as loud. (Physics say 3dcb = twice the energy but human does not perceive it that way). Hopefully I will be able to reduce the 95hz-100hz frequency by 10dcb to cut by half the perceived loudness of the drone. Last edited by Jayphil; 09-02-2015 at 07:31 PM.. |
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09-02-2015, 07:31 PM | #27 | |
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ER Downpipe, stock piping, stock resonator, vibrant resonator, Megan mufflers. The 1/4 wave resonator is my last option. First I am trying the resonators and will add sound deadening material in the trunk if drone still bother me. |
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09-02-2015, 09:04 PM | #30 |
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All of the vehicles look clean guys. Kudos!!!!!!
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09-03-2015, 10:07 AM | #31 |
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Interested in the outcome as well
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01-25-2017, 07:16 PM | #32 | |
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01-26-2017, 07:40 PM | #33 | ||
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01-27-2017, 10:52 AM | #34 |
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I get drone on mine anytime I'm under 2000 rpm's. Interesting you only get it at highway speeds. Is it because you're constantly shifting around town and cruising speed induces the drone because of the lower rpms?
I have a 550i M Sport so I know it's a different beast altogether but interesting the characteristics are so different between the I6 and the V8.
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01-27-2017, 11:26 AM | #35 |
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I have a set of J pipes (quarter length resonators) on my exhaust setup and there's minimal to no drone. Definitely worth trying out, just make sure you get the right length and the shop is competent enough to create them.
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01-28-2017, 07:50 AM | #37 | |
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I get some drone in town but mostly in confort mode when rpm is below 2500 RPM. The car in sport mode keep rpm highier and most of the time off drone zone. I would say for my car there is two drone zone, first in comfort when RPM is too low (aournd 1.5 rpm) and around 1900 to 2200 rpm(65mph and above). On highway 55 mph to around 65mph the drone is very mild unless you are climbing a big hill and the car decide not to shift to get more power.
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01-28-2017, 07:59 AM | #38 | ||
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01-28-2017, 01:41 PM | #40 |
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I just want to add that the black "ceramic" paint that I have put on the muffler cans still hold-up and this make at big difference in making my car look like more like if it was like this from factory. The color matched diffuser also add to the OEM look.
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02-10-2017, 06:23 PM | #41 |
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Where did you get that diffuser? I've been thinking about doing the Dual tip mufflers and upgrading the diffuser.
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02-10-2017, 07:25 PM | #42 | |
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Of course you will have to get it painted which is not that expensive.
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02-10-2017, 10:33 PM | #43 | |
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Thank you for the help |
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02-11-2017, 06:22 AM | #44 |
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Same place as the diffuse and included in the price I gave you.
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