[SatinblkF90]

Does anybody know if when pushing the exhaust button to "off" so the valves are closed, if this affects power output in anyway? I was thinking maybe reduced back pressure could result in less power, or maybe breathes less freely could result in lower power output when doing this. Anyone ever tested it?

[crypto]

Originally Posted by SatinblkF90

Does anybody know if when pushing the exhaust button to "off" so the valves are closed, if this affects power output in anyway? I was thinking maybe reduced back pressure could result in less power, or maybe breathes less freely could result in lower power output when doing this. Anyone ever tested it?

I can't give you a scientific answer but I can tell you I am pretty sure if they are closed and you hit the throttle hard that they open. Not sure if that helps or not.

[SatinblkF90]

Originally Posted by crypto

I can't give you a scientific answer but I can tell you I am pretty sure if they are closed and you hit the throttle hard that they open. Not sure if that helps or not.

Thanks! Interesting, they probably do but I wasn't sure because the pops/burbles are 99% gone, but maybe when just hammering in a straight line it opens them up then closes again when off the gas so would that make sense in that case!

[DryBark]

Originally Posted by SatinblkF90

Thanks! Interesting, they probably do but I wasn't sure because the pops/burbles are 99% gone, but maybe when just hammering in a straight line it opens them up then closes again when off the gas so would that make sense in that case!

According to the technical training manual, they seem to indicate the button can override the default engine settings:

"For this reason, the exhaust flaps can be influenced and closed independently of the engine dynamics control setting to Efficient, Sport or Sport+ via the sound button. By pressing the sound button, the sound produced can quickly be changed to a quieter exhaust sound without influencing the engine dynamics control settings."

If the valves are closed there is certainly more pressure so likely a slight impact on power, but can't imagine it's that much.

[SatinblkF90]

Originally Posted by DryBark

According to the technical training manual, they seem to indicate the button can override the default engine settings:

"For this reason, the exhaust flaps can be influenced and closed independently of the engine dynamics control setting to Efficient, Sport or Sport+ via the sound button. By pressing the sound button, the sound produced can quickly be changed to a quieter exhaust sound without influencing the engine dynamics control settings."

Right so the question is, with the button pressed to have it off (light is off on exhaust button) and going full throttle, does valves open back up when flooring car, then close back again when foot is off throttle, then on again when on throttle but only all the way and not partial throttle.. etc I'd like to know exactly how it affects the valves when driving in different situations, and power if at all.

[DryBark]

Originally Posted by SatinblkF90

Right so the question is, with the button pressed to have it off (light is off on exhaust button) and going full throttle, does valves open back up when flooring car, then close back again when foot is off throttle, then on again when on throttle but only all the way and not partial throttle.. etc I'd like to know exactly how it affects the valves when driving in different situations, and power if at all.

Yeah, it's really unclear on that but they make it sound like they would open on demand from the engine and revert to closed if the button is in the off position.

I believe the car can be in "sport" or "sport +", so the flaps are open, but the button would override the engine dynamic setting to close the valves, but not the engine demand-oriented software settings.

[TimmyBHGM5]

I have MPE and this button does nothing in comfort engine mode, it adds a very little bit of fake exhaust sound in engine sport mode, and adds some more exhaust sound in sport + whit pops and bangs. I have LCI and the ASD can not be completely coded off, but it is a lot less than standard. You really have to code off ASD to find out what the flap is doing with stock exhaust, otherwise you'll be just listening to ASD when you push the button.

[TimmyBHGM5]

I assume the button has nothing to do with open or close the valves, the valves will open or close base on throttle input in all engine modes, the only thing the button does is turn on and off ASD and turn pops and bangs on in sport + engine mode

[pbonsalb]

If you really cannot code out ASD on a 2020+ model, you could unplug it. I unplugged the ASD on my 2018 (dealer later plugged it back in, but right after that I flashed with BM3 and it offered the option to turn ASD off).

[crypto]

Originally Posted by TimmyBHGM5

I have MPE and this button does nothing in comfort engine mode, it adds a very little bit of fake exhaust sound in engine sport mode, and adds some more exhaust sound in sport + whit pops and bangs. I have LCI and the ASD can not be completely coded off, but it is a lot less than standard. You really have to code off ASD to find out what the flap is doing with stock exhaust, otherwise you'll be just listening to ASD when you push the button.

The MPE doesn't have valves.. so the button doesn't do anything in any mode with it. 😀

[SatinblkF90]

Originally Posted by TimmyBHGM5

I assume the button has nothing to do with open or close the valves, the valves will open or close base on throttle input in all engine modes, the only thing the button does is turn on and off ASD and turn pops and bangs on in sport + engine mode

From the sound of mine with open windows when the button is in off position it certainly sounds a lot quieter also from outside the car just driving around at partial throttle vs on position. It's a 2018 m5. This seems to indicate valves are closed but not all the time, like at full throttle they will reopen again as needed.

[TimmyBHGM5]

Originally Posted by pbonsalb

If you really cannot code out ASD on a 2020+ model, you could unplug it. I unplugged the ASD on my 2018 (dealer later plugged it back in, but right after that I flashed with BM3 and it offered the option to turn ASD off).

On 2020+ that module on the left side of trunk is gone, I wish I could have just unplugged it.

[DryBark]

Originally Posted by TimmyBHGM5

I assume the button has nothing to do with open or close the valves, the valves will open or close base on throttle input in all engine modes, the only thing the button does is turn on and off ASD and turn pops and bangs on in sport + engine mode

The button closes the valves when it's in the off position. MPE does not have valves so yours is always open.

Those with Msport exhaust have the valves open by default in sport and sport+ mode, and closed in comfort. Those values are overridden by the exhaust button, and (we think) the exhaust button is overridden by engine load.

[Maverik259]

Originally Posted by DryBark

The button closes the valves when it's in the off position. MPE does not have valves so yours is always open.

Those with Msport exhaust have the valves open by default in sport and sport+ mode, and closed in comfort. Those values are overridden by the exhaust button, and (we think) the exhaust button is overridden by engine load.

Has nothing to do with the exhaust. Only difference in "sport" is the mid pipe resonator. MPE doesn't have valves but the button will still take you out of any sport mode and reduce what you all call burbles and what bmw calls "overrun" which just means they dump excess gas into the cylinder exhaust cycle if I recall.

Exhaust button opens valves. Does not induce burbles by itself as that's a software thing and not a valve thing.

In sport mode and push exhaust button "off" will take you out of sport mode.

And yes you can code asd off in a 2020.

[DryBark]

Originally Posted by Maverik259

Has nothing to do with the exhaust. Only difference in "sport" is the mid pipe resonator. MPE doesn't have valves but the button will still take you out of any sport mode and reduce what you all call burbles and what bmw calls "overrun" which just means they dump excess gas into the cylinder exhaust cycle if I recall.

Exhaust button opens valves. Does not induce burbles by itself as that's a software thing and not a valve thing.

In sport mode and push exhaust button "off" will take you out of sport mode.

And yes you can code asd off in a 2020.

BMW's technical manual says all cars equipped with sport exhaust have the flaps open on sport and sport+. That's what I was referring to. I didn't mention burbles.

[SatinblkF90]

Originally Posted by Maverik259

Has nothing to do with the exhaust. Only difference in "sport" is the mid pipe resonator. MPE doesn't have valves but the button will still take you out of any sport mode and reduce what you all call burbles and what bmw calls "overrun" which just means they dump excess gas into the cylinder exhaust cycle if I recall.

Exhaust button opens valves. Does not induce burbles by itself as that's a software thing and not a valve thing.

In sport mode and push exhaust button "off" will take you out of sport mode.

And yes you can code asd off in a 2020.

What do you mean exhaust button off takes you out of sport mode? The engine mode itself is still in sport or sport+ with the button off, it just turns off burbles on mpe which have no valves, and on regular exhaust closes and opens the valves which they do have,plus turns off burbles. Throttle response/shifting etc. regardless of button on or off will still be mapped according to whatever engine mode the car is in between efficient/sport/sport+

[Hammer110!]

Originally Posted by crypto

The MPE doesn't have valves.. so the button doesn't do anything in any mode with it. 😀

True no valves in MPE but the button does cancel out pop/bangs and burbles when in sport +

[Maverik259]

Originally Posted by SatinblkF90

What do you mean exhaust button off takes you out of sport mode? The engine mode itself is still in sport or sport+ with the button off, it just turns off burbles on mpe which have no valves, and on regular exhaust closes and opens the valves which they do have, plus turns off burbles. Throttle response/shifting etc. regardless of button on or off will still be mapped according to whatever engine mode the car is in between efficient/sport/sport+

If i am in Sport+ and i hit the exhaust button off, it kicks me out of sport+. that is what i meant.

I'll check again on my way home from work if you think that isn't accurate. i remember testing that some time ago after i had some exhaust work done because i loathe the fart can effect coming out of a $100k car. So i tried it and remember it taking me out of Sport+. its been awhile so maybe i miss remember.

[SatinblkF90]

Originally Posted by Maverik259

If i am in Sport+ and i hit the exhaust button off, it kicks me out of sport+. that is what i meant.

I'll check again on my way home from work if you think that isn't accurate. i remember testing that some time ago after i had some exhaust work done because i loathe the fart can effect coming out of a $100k car. So i tried it and remember it taking me out of Sport+. its been awhile so maybe i miss remember.

My 2018 doesn't do that. All engine/steering/suspension modes stay the way they are, only the car becomes silent that's it.

[DryBark]

Originally Posted by SatinblkF90

My 2018 doesn't do that. All engine/steering/suspension modes stay the way they are, only the car becomes silent that's it.

Maybe the sport+ setting is removed from the screen, but the car otherwise stays in your preset engine/steering/suspension/transmission settings? That would make sense, since the exhaust setting is no longer in its pre-determined sport+, valves open position.

[SatinblkF90]

Originally Posted by DryBark

Maybe the sport+ setting is removed from the screen, but the car otherwise stays in your preset engine/steering/suspension/transmission settings? That would make sense, since the exhaust setting is no longer in its pre-determined sport+, valves open position.

No I'm pretty sure the button is only affecting the exhaust valves/noise itself independently from Engine/steering/suspension settings it's completely seperate and has nothing to do with them. You will still have the same throttle response as sport+ always gives with exhaust button off for example, just without all the extra noises.

[TimmyBHGM5]

Originally Posted by SatinblkF90

No I'm pretty sure the button is only affecting the exhaust valves/noise itself independently from Engine/steering/suspension settings it's completely seperate and has nothing to do with them. You will still have the same throttle response as sport+ always gives with exhaust button off for example, just without all the extra noises.

This is correct, I have M2 set everything sport+, and when I don't want exhaust pops I just press the exhaust button to turn it off, all settings still remain as sport +, the M2 on instrument cluster no long stay lit but this doesn't mean drivetrain settings are changed.