[jimbethesda]

Yes, I know this has been discussed. Yes, I saw this video:

There seems to still be confusion what this button does, at least to me. This video seems to suggest it just toggles ASD off/on, but many here want bimmercode to code ASD off. Why, if there is already a button for it? Are they just mistaken? Or...what?

I'm not interested in: I hear more burbles, I hear more farting, definitely louder.

I'm trying to figure out exactly what it does from a technical/mechanical question. Does it:

1) Toggle ASD off/on
2) Make ASD louder/softer (it's always on)
3) Make the actual exhaust louder/softer (either with flaps or something else)
4) 1 & 3
5) 2 & 3
6) Something else

If it changes the actual exhaust at all, how does it compare with the M Engine Dynamics Control settings? The manual says:

"The SPORT and SPORT PLUS programs change the sound characteristics of the exhaust gas system. The sound takes on a sporty nature."

Anybody know exactly what this button does?

[zambarossa]

#5 I believe

SPORT/SPORT+ will make it sound louder vs COMFORT if Sound Control is Off. In either mode, it goes quieter with it On. Not sure how it compares between the modes when ON (i.e quieter) , have not played with that to notice.

[asmazda]

When the button is off (not illuminated) it turns off ASD and closes the exhaust valve regardless what engine mode you are in. When the button is on you get ASD and exhaust valves open when engine is in the higher sport modes. Just to clarify, when engine in comfort mode exhaust valves closed regardless of button status.

[jimbethesda]

So far, two different answers! It's as clear as mud.

[zambarossa]

Originally Posted by jimbethesda

So far, two different answers! It's as clear as mud.

Just try it for yourself. The difference is audible. Do it with windows up/down and check it from the outside. You'll figure out quickly. To me, I could care less how it is happening, what matter is audible level and comfort. On long drives, it gets tiring for me unless sound control is off.

[jimbethesda]

Originally Posted by zambarossa

Just try it for yourself. The difference is audible. Do it with windows up/down and check it from the outside. You'll figure out quickly. To me, I could care less how it is happening, what matter is audible level and comfort. On long drives, it gets tiring for me unless sound control is off.

That would answer if it changes the real exhaust sound, good suggestion. That still leaves the uncertainty regarding its effect (or not) on ASD. I'd have 1/2 of the answer.

Why the F can't BMW just be clear? They seem to really work to hide ASD as a thing.

[zambarossa]

Originally Posted by jimbethesda

That would answer if it changes the real exhaust sound, good suggestion. That still leaves the uncertainty regarding its effect (or not) on ASD. I'd have 1/2 of the answer.

Why the F can't BMW just be clear? They seem to really work to hide ASD as a thing.

Honestyl I would take any answer you get here about ASD with a bag of salt. With OTA software updates and BMW not being very clear on this, it could change any time. Not everyone gets the OTA updates at the same time either, so that confuses things even more.

I am glad there is a separate button for the exhaust loudness. On my F30 340 with MPE it would be loudest in Sport+ but that is the mode I preferred to be most of the time, so I had to choose driving characteristics vs sound comfort. With the M3 I can mix and match.

[Forzanerazzurri]

That video is obnoxious. It's like a child made that. And what does ASD mean?

[forza1976]

Originally Posted by Forzanerazzurri

That video is obnoxious. It's like a child made that. And what does ASD mean?

Active sound design

[Forzanerazzurri]

Originally Posted by forza1976

Active sound design

Thank you

[Tyga11]

Originally Posted by jimbethesda

That would answer if it changes the real exhaust sound, good suggestion. That still leaves the uncertainty regarding its effect (or not) on ASD. I'd have 1/2 of the answer.

Why the F can't BMW just be clear? They seem to really work to hide ASD as a thing.

Jim -

I think you answered your own question. BMW is trying to blend in ASD with the active exhaust and make it as confusing as possible for us to know the difference.

[iviegatron]

My goal is to code ASD out with Bimmercode and use the exhaust button to open/close the flaps once I get my exhaust. I don't want any confusion or interference with the fake sound.

[Erebor]

Originally Posted by asmazda

When the button is off (not illuminated) it turns off ASD and closes the exhaust valve regardless what engine mode you are in. When the button is on you get ASD and exhaust valves open when engine is in the higher sport modes. Just to clarify, when engine in comfort mode exhaust valves closed regardless of button status.

This is the correct answer.

[Rono63]

What about when in cold start mode? Can you close the valve?

[Neek]

Originally Posted by Erebor

This is the correct answer.

So turning the button off is essentially a simple "shush" function. If the engine mode chosen is one that would normally open the valves and turn on cabin exhaust noises (ASD), it will not allow the mode to do those things. That's it.

[jimbethesda]

Originally Posted by Neek

So turning the button off is essentially a simple "shush" function. If the engine mode chosen is one that would normally open the valves and turn on cabin exhaust noises (ASD), it will not allow the mode to do those things. That's it.

I just wish I could only shush the fake noises. I guess that's what coding is for

[Erebor]

Originally Posted by Neek

So turning the button off is essentially a simple "shush" function. If the engine mode chosen is one that would normally open the valves and turn on cabin exhaust noises (ASD), it will not allow the mode to do those things. That's it.

Yes, that's exactly what that button does.

[Kevin234]

Good info here. Think I finally have a handle on how this thing works.
Question - I assume the "M Sound On/Off" button in the 2023 M3s is the same as "ASD On/Off" button being discussed here?

To summarize (I tried uploading a table to make it easier, but didn't work ):

ASD Button On (same as M Sound On?)
Comfort Mode: ASD On, Valves Closed
Sport Mode: ASD On, Valves Open
Sport + Mode: ASD On, Valves Open

ASD Button Off (same as M Sound Off?)
Comfort Mode: ASD Off, Valves Closed
Sport Mode: ASD Off, Valves Closed
Sport + Mode: ASD Off, Valves Closed

So basically, there is no option to have the exhaust valves open and the fake speaker sound off at the same time, and that's why we need Bimmer Code, correct?

[chris3g]

Originally Posted by Kevin234

Good info here. Think I finally have a handle on how this thing works.
Question - I assume the "M Sound On/Off" button in the 2023 M3s is the same as "ASD On/Off" button being discussed here?

To summarize (I tried uploading a table to make it easier, but didn't work ):

ASD Button On (same as M Sound On?)
Comfort Mode: ASD On, Valves Closed
Sport Mode: ASD On, Valves Open
Sport + Mode: ASD On, Valves Open

ASD Button Off (same as M Sound Off?)
Comfort Mode: ASD Off, Valves Closed
Sport Mode: ASD Off, Valves Closed
Sport + Mode: ASD Off, Valves Closed

So basically, there is no option to have the exhaust valves open and the fake speaker sound off at the same time, and that's why we need Bimmer Code, correct?

More or less, but the valves are never just open or closed. They are controlled by a complex set of ecu tables and they open variably based on rpm and load, with different values for each mode. when the button is off 3 things happen

1- ASD is disabled (some people say it isn’t “fully” disabled but the G8x technical manual from bmw says otherwise)
2 - the valves use a “quiet mode” ecu map where they are mostly closed , until high engine load/rpm
3 - the decel overrun (burbles) are disabled , by changing to an alternate set of ecu params.

[Kevin234]

^^^^

Soooo...let's make some edits...

ASD Button On (same as M Sound On?)
Comfort Mode: ASD on; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.
Sport Mode: ASD on; Valves open; Decel overrun (burbles) enabled.
Sport + Mode: ASD on; Valves open; Decel overrun (burbles) enabled.

ASD Button Off (same as M Sound Off?)
Comfort Mode: ASD off; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.
Sport Mode: ASD off; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.
Sport + Mode: ASD off; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.

Do we have it now

[jimbethesda]

Originally Posted by Kevin234

^^^^

Soooo...let's make some edits...

ASD Button On (same as M Sound On?)
Comfort Mode: ASD on; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.
Sport Mode: ASD on; Valves open; Decel overrun (burbles) enabled.
Sport + Mode: ASD on; Valves open; Decel overrun (burbles) enabled.

ASD Button Off (same as M Sound Off?)
Comfort Mode: ASD off; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.
Sport Mode: ASD off; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.
Sport + Mode: ASD off; Valves in quiet mode (mostly closed, until high engine load/rpm); Decel overrun (burbles) disabled.

Do we have it now

No, definitely not. I noticed a significant decrease in engine noise inside my car when I coded ASD off vs just having the sound control off. I think ASD is on all the time.

[Mike02z]

The button does not totally turn it off from what I can tell. Coding it out is the only way to get it totally off. Then if the dealer does a software update it will need to be coded out again.