08-30-2015, 08:06 PM | #1 |
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What is this sound? Is it normal?
I've had my F82 (DCT) for a little over 5 months and put about 14,000 miles on it. I've noticed a sound for a little while, sort of a vibration at 1500RPM or so at 50+% throttle. It's not super loud and it doesn't appear to affect the performance of the car, but I'm wondering if anyone can tell me what it is, and if it's something I should try and have fixed. I don't know if the car has always made this sound, or if it's something new.
I uploaded a clip here: https://soundcloud.com/kyle-cronin/m4-sound This audio was recorded with a microphone dangling outside the bottom of the driver's door. In this clip, I'm in 3rd gear at about 1000RPM. I then give about 50% throttle, and as the tach passes 1500RPM you can hear the metallic vibrating sound. As the RPMs continue to climb the sound disappears. I also recorded the engine and the exhaust by putting a microphone near the wipers and dangling a microphone out the tailgate, both of which did not register the sound. It must be coming from underneath the center of the car. Last edited by kylecronin; 08-31-2015 at 09:52 AM.. |
08-31-2015, 02:06 PM | #4 | |
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It's the exhaust valves resonating.
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09-02-2015, 02:31 PM | #6 | |
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Dealer will change out the exhaust it if it really bugs you as it's a known fault. You could remove the internal spring in each valve housing and stretch it out a bit and then re-fit. Worked for me but it is a PITA to re-fit the spring into the valve assembly. Mad. |
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