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      01-19-2020, 01:06 PM   #1
altjx
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No longer hearing turbos in my new M4 CS

Hey guys. New here to the forum and to the BMW world. I came from a '17 GT350 and absolutely enjoyed the sound, and one of the things that I loved the most about the M4 CS considering the lack of v8 is the sound of the turbos.

I just finished going through the service break-in period yesterday (dealership did it at 850 miles while they were replacing a broken hose under warranty) and this morning I drove the car and was a little surprised. I no longer heard the "woosh" that I heard initially under heavy throttle. So now it just sounds like any other car from the inside.

Is there anything that the dealership does during the service break in period that affects the sound by chance? From what I understand, the service break in period is just simply flushing out fluids and some say "a little more power".

I did a little bit of research and learned about active sound design (ASD), but I don't know if this is something that is even in the M4 CS and, if so, if it was just maybe disabled during the break-in period. I also don't think I can hear it much with the windows down either.

Any thoughts would greatly appreciated! I'd love to hear this sound a LOT more, even more than when I bought it... without having warranty issues of course.
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      01-19-2020, 01:17 PM   #2
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Get aftermarket intakes

Nothing to worry about warranty wise with those.

Sometimes I go from Sport+ to Sport just to stop hearing spool all day and hear the exhaust, then I remember why I keep it in Sport+
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      01-19-2020, 01:19 PM   #3
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Quote:
Originally Posted by altjx View Post
Hey guys. New here to the forum and to the BMW world. I came from a '17 GT350 and absolutely enjoyed the sound, and one of the things that I loved the most about the M4 CS considering the lack of v8 is the sound of the turbos.

I just finished going through the service break-in period yesterday (dealership did it at 850 miles while they were replacing a broken hose under warranty) and this morning I drove the car and was a little surprised. I no longer heard the "woosh" that I heard initially under heavy throttle. So now it just sounds like any other car from the inside.

Is there anything that the dealership does during the service break in period that affects the sound by chance? From what I understand, the service break in period is just simply flushing out fluids and some say "a little more power".

I did a little bit of research and learned about active sound design (ASD), but I don't know if this is something that is even in the M4 CS and, if so, if it was just maybe disabled during the break-in period. I also don't think I can hear it much with the windows down either.

Any thoughts would greatly appreciated! I'd love to hear this sound a LOT more, even more than when I bought it... without having warranty issues of course.
Coming from a gt350, you are going to have quite an adjustment period in the sound department. The turbos aren't that audible in stock form. Every once in a while you'll hear them. The break in procedure has nothing to do with this.

It's a matter of opinion, but the car sounds MUCH more natural with the ASD coded off. That being said, on the outside it will still sound like a swarm of bees that had chili for dinner, but at least it's improved in the cabin.
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      01-19-2020, 01:23 PM   #4
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^Agreed about turning ASD off, I coded mine out the day I brought the car home
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      01-19-2020, 01:23 PM   #5
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Biggest disappointment with this car is when I realized I couldn't put BOVs on it that vent to the atmosphere. I'm 43 years old and will never lose the love of those annoying ass (to most people) things. hah
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      01-19-2020, 01:30 PM   #6
altjx
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Thanks a lot guys! I definitely appreciated the turbo sounds considering the adjustment for the GT350. It made up for it, a lot!! Lol. I've seen some people get aftermarket cold air intakes in the mustang world and it didn't really make much of a difference tbh, not the kind of sound I'm looking to get back at least. Especially if we're talking about the little baby "woosh" from the intake. Never heard an aftermarket on one this car though so I'm not sure.

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Originally Posted by NickyC View Post
Biggest disappointment with this car is when I realized I couldn't put BOVs on it that vent to the atmosphere. I'm 43 years old and will never lose the love of those annoying ass (to most people) things. hah
Yes!! Me too. I don't think I'll ever get tired of it. I don't want to sound all crazy and ridiculous or anything, but man it's nice to hear the turbos in this car when they're loud enough in the cabin.
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      01-19-2020, 01:46 PM   #7
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Quote:
Originally Posted by NickyC View Post
Biggest disappointment with this car is when I realized I couldn't put BOVs on it that vent to the atmosphere. I'm 43 years old and will never lose the love of those annoying ass (to most people) things. hah
Pshhhh tututututu
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      01-19-2020, 02:34 PM   #8
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Quote:
Originally Posted by NickyC View Post
Biggest disappointment with this car is when I realized I couldn't put BOVs on it that vent to the atmosphere. I'm 43 years old and will never lose the love of those annoying ass (to most people) things. hah
Do you have cone filter intakes? My BMS ones make a loud PSHHH noise when shifting/letting off the throttle..

No pshhhttutututututu but better than nothing
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      01-19-2020, 03:54 PM   #9
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Yes intakes will give you that sweet induction sound, I installed the ssr steel filters and they sound great
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      01-19-2020, 04:32 PM   #10
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Quote:
Originally Posted by allinon72 View Post
Coming from a gt350, you are going to have quite an adjustment period in the sound department. The turbos aren't that audible in stock form. Every once in a while you'll hear them. The break in procedure has nothing to do with this.

It's a matter of opinion, but the car sounds MUCH more natural with the ASD coded off. That being said, on the outside it will still sound like a swarm of bees that had chili for dinner, but at least it's improved in the cabin.
Quote:
Originally Posted by Kilabyte View Post
^Agreed about turning ASD off, I coded mine out the day I brought the car home
The M4cs has very little ASD if any at all. I couldn't notice a difference after I coded it out on mine.

I found ASD terribly annoying on my previous 2015 M4 and also coded it out. On that car, it was very noticible. Not the same case on the M4cs.
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      01-19-2020, 04:35 PM   #11
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OP, simply removing the carcoal filters from the intake air box with significantly increase the turbo spooling sound. I did this on my M4cs. If you so desire, you can also replace the stock paper filters for aftermarket ones that will increase the sound further.
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      01-19-2020, 04:58 PM   #12
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Dunno about the CS but I can hear the turbos in Sport+ mode pretty easily
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      01-19-2020, 05:26 PM   #13
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Quote:
Originally Posted by CanAutM3 View Post
OP, simply removing the carcoal filters from the intake air box with significantly increase the turbo spooling sound. I did this on my M4cs. If you so desire, you can also replace the stock paper filters for aftermarket ones that will increase the sound further.
Did you end up moving to a CAI after this? On the fence about getting BMC filters if I'm going to end up wanting a CAI down the road...
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      01-19-2020, 05:32 PM   #14
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Quote:
Originally Posted by CanAutM3 View Post
OP, simply removing the carcoal filters from the intake air box with significantly increase the turbo spooling sound. I did this on my M4cs. If you so desire, you can also replace the stock paper filters for aftermarket ones that will increase the sound further.
Hmm, interesting. Good to know. I guess my biggest question though is why do I not hear it anymore? I heard it before the service break in and now I literally don't hear it even a little bit. It's not even that it got quiet, I just simply don't hear it. The car does feel a little different (more powerful or maybe it's just psychological since the service break-in) but why do I not hear it at all anymore?
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      01-19-2020, 06:14 PM   #15
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Quote:
Originally Posted by altjx View Post
Hmm, interesting. Good to know. I guess my biggest question though is why do I not hear it anymore? I heard it before the service break in and now I literally don't hear it even a little bit. It's not even that it got quiet, I just simply don't hear it. The car does feel a little different (more powerful or maybe it's just psychological since the service break-in) but why do I not hear it at all anymore?
There's no power change after break-in.
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      01-19-2020, 06:15 PM   #16
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Originally Posted by SenorRoadRage View Post
Did you end up moving to a CAI after this? On the fence about getting BMC filters if I'm going to end up wanting a CAI down the road...
No, I just stayed with the stock paper filters.
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      01-20-2020, 09:08 AM   #17
altjx
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What's the reason that the sounds would go away though? Does that just happen after they get "broken in" or anything?
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      01-20-2020, 09:40 AM   #18
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I'm surprised no one has said it. I honestly think you just got used to the car and aren't noticing it anymore.
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      01-20-2020, 10:10 AM   #19
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Nothing done during the break-in service would have anything to do with the ability to hear the sound from the turbo. What was the hose that was replaced? Are you sure it wasn't a vacuum leak you were hearing?
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      01-20-2020, 10:10 AM   #20
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Originally Posted by nioh_lbbm2 View Post
I'm surprised no one has said it. I honestly think you just got used to the car and aren't noticing it anymore.
Honestly I would say that about the exhaust but the sounds under the hood were extremely noticeable. It went from very noticeable to not noticeable at all literally within like a day. It was actually really loud in the cabin under heavy load.
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      01-20-2020, 10:13 AM   #21
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Originally Posted by RustySeatbelt View Post
Nothing done during the break-in service would have anything to do with the ability to hear the sound from the turbo. What was the hose that was replaced? Are you sure it wasn't a vacuum leak you were hearing?
Ahhhhhhhhh... I see what you're saying. I think this is the answer I was looking for. I didn't think of this at first. According to the warranty paperwork, it was an intake leak that was traced to charge pipe 1. Here's a copy of a screenshot from the work that was done:



Thanks for bringing that up man. Makes sense now. Could this also have resulted in less power, which is why I think I feel more power now?
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      01-20-2020, 10:32 AM   #22
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Quote:
Originally Posted by altjx View Post
Ahhhhhhhhh... I see what you're saying. I think this is the answer I was looking for. I didn't think of this at first. According to the warranty paperwork, it was an intake leak that was traced to charge pipe 1. Here's a copy of a screenshot from the work that was done:


Thanks for bringing that up man. Makes sense now. Could this also have resulted in less power, which is why I think I feel more power now?
Yes, absolutely. The vacuum leak could definitely have been robbing you of power, and the running lean likely means you should see that the car is running cooler as well.
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