05-09-2019, 07:40 PM | #1 |
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Hi everyone.
I noticed this on my N55 335 as well so not sure if this is normal. I'm just noticing it now on my S55 F80 but it could very well have always been there. It happens between 3rd gear and higher (mostly because rpm increase is slower) under load. So for instance say going up a hill in 3rd gear, Rpm currently at 2,200 rpm. Roll into the throttle and as the rpm passes 2,500 rpm, what sounds like a sheet of paper flapping in the wind sound comes in and lasts for about 500-750 rpm (may be longer but that's when you really notice it). Sound can also be similar to someone blowing into a spinning fan. I've been doing some googling and can't see much except perhaps some folks experiencing this on other turbo models and pin pointing it to the diverter valve springs? Basically cracking open when it should be closed and leaking some boost? Anyone come across this? |
05-10-2019, 09:28 PM | #2 |
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05-11-2019, 03:10 PM | #3 |
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Nice find. Tough to tell but it is similar. Didn't see a diagnosis though. Went to BMW and of course it wasn't doing it. Not today. Googling I found people talking about something similar and they said perhaps the diverter valve gets stuck sometimes and let's some boost leak by. But like I said they didn't do anything. Car driving normal now.
I definitely noticed the same sound on my N55 335 when I had it. Not all the time in that case either. |
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05-11-2019, 05:01 PM | #4 |
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My car makes a noise like that when the AC is on and I’m accelerating. When it’s turned off there is nothing.
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05-11-2019, 06:13 PM | #5 |
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Yup, that’s my original video. Tell your dealer that they need to add an additional weight to the low pressure line for the HVAC. Apparently it can rattle in a certain rpm range somewhere from the engine bay through the firewall.
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05-11-2019, 06:14 PM | #6 | |
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05-12-2019, 07:23 AM | #7 | ||
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09-09-2020, 07:03 AM | #8 | |||
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09-09-2020, 08:44 AM | #9 |
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Glad this was bumped. I also have the same sound. There is a weight that you put on the low pressure AC line that is supposed to fix this. It only happens with the AC on and under load. Makes the car sound like it's breaking down while accelerating.
I want to diy this as I don't want the dealer taking my car out for a joyride and it's a cheap part but I don't know where exactly the weight goes. Can someone take a pic of the weight that the dealer added? Thanks
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09-09-2020, 09:24 AM | #10 | |
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Are you tuned? I notice the sound is more prevalent with a tune and more intermittent on stock tune. |
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09-09-2020, 09:29 AM | #11 | ||
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09-09-2020, 10:00 AM | #13 |
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Thanks, s55 looks different. Can't find that hose. There was a TSB for this which I guess also has instructions if someone has access.
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09-09-2020, 10:47 AM | #14 | |
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https://f80.bimmerpost.com/forums/sh....php?t=1381897 Both dealers I went to said there was no TSB for this issue which is unfortunate. For F30, there is. Last edited by KeyBoy; 09-09-2020 at 12:28 PM.. |
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09-11-2020, 08:34 PM | #15 | ||||
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09-23-2021, 07:43 AM | #16 |
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Thank god I found this thread. I have this exact same issue/flutter on my 2016 F80 M3 and as said before only happens when the AC is on and exactly between 2500 to 3000 RPMs. Did anyone found a DIY way to mitigate it or fix it?
If not, then I'll probably mention it when I bring the car in for the next oil change at the dealership. |
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09-27-2021, 07:52 PM | #17 | |
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06-08-2022, 08:50 AM | #19 |
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06-14-2022, 06:44 PM | #20 |
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https://www.ecstuning.com/b-genuine-...t/64539322952/
Here's the part. You have to take off your intercooler, then you can access the a/c line |
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06-14-2022, 08:34 PM | #21 | |
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06-14-2022, 09:14 PM | #22 | |
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