[mblaucoupe135]

In the last few weeks, I have noticed a slight fluttering like sound I think is coming from the engine bay when I let off the throttle. The car seems to still be running fine but the noise is a bit concerning since it recently started occurring. I should mention that I have a Dinan air intake on the car as well as their piggyback tune. Has anyone else experienced something like this? I know some people have complained about a wastegate rattle on bmw turbo engines so maybe that's what it is.

[tubingchamp]

Originally Posted by mblaucoupe135

In the last few weeks, I have noticed a slight fluttering like sound I think is coming from the engine bay when I let off the throttle. The car seems to still be running fine but the noise is a bit concerning since it recently started occurring. I should mention that I have a Dinan air intake on the car as well as their piggyback tune. Has anyone else experienced something like this? I know some people have complained about a wastegate rattle on bmw turbo engines so maybe that's what it is.

Recirculating valve flutter is sort of an expected sound with an aftermarket air intake.

When you're pushing the car a bit more it will flutter more loudly. Sometimes mine makes the full F&F BOV flutter sound.. Curious how loud it will get at AutoX this weekend

Does it sound like this?

[mblaucoupe135]

Originally Posted by tubingchamp

Recirculating valve flutter is sort of an expected sound with an aftermarket air intake.

When you're pushing the car a bit more it will flutter more loudly. Sometimes mine makes the full F&F BOV flutter sound.. Curious how loud it will get at AutoX this weekend

Does it sound like this?

https://www.instagram.com/p/CfhPptspsK0/

I'm familiar with the bov sound and my car makes that sound too, which I love! But this sound is happening right after the bov sound when I come off the throttle and is not nearly as loud as the bov sound. Any idea what it could be or if it's normal?

[tubingchamp]

Originally Posted by mblaucoupe135

I'm familiar with the bov sound and my car makes that sound too, which I love! But this sound is happening right after the bov sound when I come off the throttle and is not nearly as loud as the bov sound. Any idea what it could be or if it's normal?

If possible, I'd get a recording of the sound from the interior and exterior.. Not really sure.

Is it the noise of the air recirculating? (kind of like a dispersing hum with a sliiiiight rattle?)

[Rbcmima]

I got this too, couple days after installing the Dinan CAI, was pretty concerning. If you post a video of the sound then I can compare mine to it and tell you if its the same. Kinda sounds like a hollow echoey sound.

Edit: https://vimeo.com/738043999

[mblaucoupe135]

Originally Posted by tubingchamp

If possible, I'd get a recording of the sound from the interior and exterior.. Not really sure.

Is it the noise of the air recirculating? (kind of like a dispersing hum with a sliiiiight rattle?)

Ok I will see if I can record it and post it.

[mblaucoupe135]

Originally Posted by Rbcmima

I got this too, couple days after installing the Dinan CAI, was pretty concerning. If you post a video of the sound then I can compare mine to it and tell you if its the same. Kinda sounds like a hollow echoey sound.

Edit: https://vimeo.com/738043999

I think that is it! Kind of glad I'm not the only one hearing this. Hoping there isn't anything wrong with the car, and it's just something noticeable now since the intake has opened up the sound of the turbo and related parts a bit more.

[mblaucoupe135]

I want to clarify the sound a bit more. I'm thinking it is more like almost a bubbling sound. At first I thought it was my exhaust burbling, but this car doesn't really do that and it's more coming from the engine bay area.

[Rdurty2]

It’s a normal sound with an aftermarket intake. You will now hear all sorts of odd intake noises that were always happening you just couldn’t hear them with the stock intake.

[mblaucoupe135]

Originally Posted by Rdurty2

It’s a normal sound with an aftermarket intake. You will now hear all sorts of odd intake noises that were always happening you just couldn’t hear them with the stock intake.

I hope you are right. The weird thing is I hadn't noticed this noise the first few months I had the intake on the car but started noticing after some hard driving in the mountains with the car loaded down with luggage.

[Rdurty2]

Originally Posted by mblaucoupe135

I hope you are right. The weird thing is I hadn't noticed this noise the first few months I had the intake on the car but started noticing after some hard driving in the mountains with the car loaded down with luggage.

Probably just the extra load from the thinner air

[tubingchamp]

Originally Posted by Rdurty2

Probably just the extra load from the thinner air

Yep. The clip sounds pretty normal to me.

[Dinan_Engineering]

Originally Posted by mblaucoupe135

I hope you are right. The weird thing is I hadn't noticed this noise the first few months I had the intake on the car but started noticing after some hard driving in the mountains with the car loaded down with luggage.

Everything I have read in the thread and the videos posted all seem pretty normal with the semi-open intake. Did you also install the turbo inlet recently by chance? That mod makes those BOV/flutter noises to be even more vocal/apparent is the reason I ask.

[mblaucoupe135]

Originally Posted by Dinan_Engineering

Everything I have read in the thread and the videos posted all seem pretty normal with the semi-open intake. Did you also install the turbo inlet recently by chance? That mod makes those BOV/flutter noises to be even more vocal/apparent is the reason I ask.

Thanks Dinan for responding to my post, I appreciate it. That makes me feel much better than the noises I'm hearing seem normal with the semi open intake. I don't have the turbo inlet yet but was thinking about getting it too. I'm hesitating because a few people on the forms mentioned having trouble installing it themselves.

[m_g42bmw]

Originally Posted by mblaucoupe135

I hope you are right. The weird thing is I hadn't noticed this noise the first few months I had the intake on the car but started noticing after some hard driving in the mountains with the car loaded down with luggage.

Yep it's completely normal I also have a Dinan cold air intake the sound weirdly Reminds me of a toilet flush 🤷*♂️

[Dynamodux]

Probably Compressor surge

[Rdurty2]

Originally Posted by mblaucoupe135

Thanks Dinan for responding to my post, I appreciate it. That makes me feel much better than the noises I'm hearing seem normal with the semi open intake. I don't have the turbo inlet yet but was thinking about getting it too. I'm hesitating because a few people on the forms mentioned having trouble installing it themselves.

1 person had trouble installing it and blamed the part which I think it was installer error as my Dinan inlet installed without issue. The person who said their pcvhose wouldn’t fit probably just needed to lube the oring as it’s a tight fit, as it should be.

Granted I noticed 0 difference with the inlet but didn’t really expect to
Notice anything.

[mblaucoupe135]

Originally Posted by Rdurty2

1 person had trouble installing it and blamed the part which I think it was installer error as my Dinan inlet installed without issue. The person who said their pcvhose wouldn’t fit probably just needed to lube the oring as it’s a tight fit, as it should be.

Granted I noticed 0 difference with the inlet but didn’t really expect to
Notice anything.

Good to know. Did you notice increased sound with the inlet pipe? Also do you have the Dinan intake?

[Rdurty2]

Originally Posted by mblaucoupe135

Good to know. Did you notice increased sound with the inlet pipe? Also do you have the Dinan intake?

I do have a Dinan intake and I also have the fake engine noise turned off.

Between the sound the intake already made, engine and exhaust noise I could tell no difference after installing the inlet.

If someone installed it without telling me I would have no idea it was even there. Despite that it’s a nice looking piece.

[mblaucoupe135]

Originally Posted by Rdurty2

I do have a Dinan intake and I also have the fake engine noise turned off.

Between the sound the intake already made, engine and exhaust noise I could tell no difference after installing the inlet.

If someone installed it without telling me I would have no idea it was even there. Despite that it’s a nice looking piece.

Thanks for the info. Based on the fact you aren't noticing a difference in sound, I think I will have to pass on it for the time being. It doesn't seem worth the price and time and effort to install just for something that looks nice.

[Rdurty2]

Originally Posted by mblaucoupe135

Thanks for the info. Based on the fact you aren't noticing a difference in sound, I think I will have to pass on it for the time being. It doesn't seem worth the price and time and effort to install just for something that looks nice.

Agreed

[BigRon033]

None of the B-series engines have blow-off valves, so you're going to be subjected to a bit more compressor noise compared to prior engines (N55, N54, ect). It's even more apparent on a heavier car like the X5/X7, but it's heavily dampened by the factory intake system.

If it wasn't making any odd noises with the factory intake, I wouldn't be concerned. The engine is tuned to ingest any excess pressure in the intake system (when you suddenly go off throttle) by opening the Valvetronic (intake valves) and retarding the ignition timing.