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05-31-2021, 05:11 AM | #1 |
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AKRAPOVIC owners: Got a super annoying exhaust rattle when lift off.
When in any gear when the tach hits 1800 rpm, it gives a nasty rattle that I've pin pointed to the driver side.
Some facts: - got akra - i have my valve wired open - driving very slow in the morning doesn't make the noise - only after a warm up, and I need to get up to speed before it starts making the noise - my exhaust rubber valve tubes are connected - and not shut/plugged - It sounds like a metal rasp From what I can also diagnose is that it's not the valve or the mechanism that's rattling at idle or anything. It happens in any gear, and its super annoying. When going down a small hill and beside a wall, if I can keep the speed consistent, the sound can always be heard, but its always during the 1800rpm-1700rpm range ONLY. Things I haven't done yet is close the valve. I've tried to put my gopro on the bumper area to get a better noise, but it's got alot of wind noise so its hard to hear. But with windows down, its super easy and quite loud. I can't seem to find anyone with the same issue, as the closest is someone with akra, having a vibrating issue noise when idle. But this isn't the problem I'm having. I assume its the exhaust? Or am I looking in the wrong area? |
05-31-2021, 05:56 PM | #4 | |
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The sound is almost like a small saw buzzing sound, where a saw comes into contact with metal for a brief second. If I keep my speed constant and the tach is at 1800 rpm, the sound can be sustained. |
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05-31-2021, 05:57 PM | #5 |
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06-14-2021, 02:32 AM | #6 |
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OK I solved my own problem.
Seems like the flap mod wasn't completely set to open, so I guess the vacuum pump tries to close it. So I zip tied it again to be super tight and now it's fully open. Totally no rattle anymore. |
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06-16-2021, 11:59 PM | #8 |
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I had a rattle and needed to adjust the rod where the vacuum chamber is. Since you're forcing the valves to stay open I would disconnect the vacuum hose and plug it properly as there's no need for you to have it plugged in.
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06-17-2021, 08:34 AM | #9 | |
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2. Plug the hose by zipties is ok? Was yours quite audible when windows are down? |
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07-11-2021, 10:25 AM | #10 |
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I solved it. Finally had a day to fully diagnose the problem, and eliminate one thing at a time.
1. Removed the tips, and then removed my zip ties that keep the valves open - tested driving around in normal mode, no buzzing. When in M mode, buzzing like crazy on lift off. 2. Removed the rubber hose from both sides, and plugged them with a golf tee and then zip tied them shut. - tested fully and zero buzzing in normal and M mode. Voila. I think its the valve problem on the akra's left side. So I just left it plugged and tucked it away in the heat shields. Took such a long time to diagnose as I didn't have any tools. |
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