Why is the sunroof so LOUD????

I cannot get over how freeking loud the wind deflector on the sunroof is. I'm talking about the mesh screen that is attached to the factory windscreen that pops up when you open the roof all the way. It is so loud you can't use the sunroof over 40mph. And it's not just my car- I asked 2 friends with 2012 750IL's and they said the same thing- they can't use the sunroof because it sounds ridiculous. If you reach up and manually pull the deflector down the noise disappears. Anyone else experience this, or had it fixed??

Yes; it's loud!

Have you ever noticed that over ~80mph the deflector actually lowers itself a bit?

I agree that it's a bad design - but the weather here is too great to let it stop me from opening it.

Does it lower due to resistance or programming?

If programming, maybe it can be programmed to a different height all together, finding the right balance of noise to deflection….

What is the effect with the shield up? Does it reduce drag and turbulence for backseat pax? A safety device. There has to be a reason for it to be there.

It's a wind deflector, so the wind doesn't rush into the cabin...

I never opened my sunroof, I like isolated cabin.

The thing is that it's a diffuser and not a deflector. I had a deflector in my last 7, and it was much quieter. Not sure about the back passengers, because they're not allowed to complain, but the front compartment doesn't experience any less turbulence in my F01 than it did from the sunroof in my E65. Sometimes I just keep the sunroof open around 70% so that the diffuser doesn't engage. That damn thing is loud enough to drive a sane man over the edge. Maybe those Germans added it in to cover the noise of that garbage stereo they sold us for an extra $1800.

It lowers because of programming - once you slow down from a high speed it doesn't pop back up until you hit +/-55mph.

That's a brilliant thought - when I get my car out of the shop I will look at the parameters in the sunroof module and see if anything can be changed regarding diffuser height.

Originally Posted by dbs600

Does it lower due to resistance or programming?

If programming, maybe it can be programmed to a different height all together, finding the right balance of noise to deflection….

Ok, at least I'm not the only one!!

The problem lies with the mesh- I'm thinking of cutting it out to see if it improves the sound. I can't believe you can buy a $100,000 car that has a useless sunroof....

Well - at least it's fine when you're parked .

Originally Posted by AdamG13

The thing is that it's a diffuser and not a deflector.

Learn something every day! What's the difference between a diffuser and a deflector? The former is mesh and allows [some] air (sound) to pass, while the latter is solid and completely redirects? If so, thoughts on why they opted for a diffuser this time around?

I'd think the deflector (was a solid black piece of metal in my E65) would be designed to carry the wind stream over the roof opening, but maybe they found that it was just directing it into the face of rear passengers. The diffuser is meant to just break the wind up - sort of like those rear wind screens that some convertibles have. I had some type of chevrolet as a rental car a while ago (i think it was an impala), and it had some loud diffuser also. I wouldn't imagine BMW would use them because they're cheaper than a piece of solid metal, but who knows with these guys.

Hmm... okay; thanks!