[Murf]

After a couple of day s with ASD off I can now say I really like it, especially in M2.

[Spiffx]

Originally Posted by snareman

I thought they had finally done it correctly where they give you the button to turn it off inside, unfortunately that also sort of turns it off outside as it closes the valves. I hate AS and they need to give us an option to disable it. The only time I could really see wanting to use it would be if I had a friend naive to its existence riding with me and wanted to impress them with how cool my engine sounds. Otherwise it's just me thinking the car sounds super cool, but since I'm the only one hearing it's kind of all in my head.

I would assume that closing the valves would also affect performance (e.g., torque, horsepower, acceleration). Would be grateful if someone could confirm or explain this? Thanks.

[Spiffx]

Originally Posted by Murf

After a couple of day s with ASD off I can now say I really like it, especially in M2.

Hey Murf, do you know if turning off ASD has affected performance (e.g., torque, horsepower, acceleration)?

[forza1976]

Originally Posted by Spiffx

Hey Murf, do you know if turning off ASD has affected performance (e.g., torque, horsepower, acceleration)?

No. Full stop!

[Encanto]

Originally Posted by Spiffx

Hey Murf, do you know if turning off ASD has affected performance (e.g., torque, horsepower, acceleration)?

Is this a serious question?

[JDUNITNOW]

Has anyone did this with also doing the exhaust flap mod? I'm debating trying it and actually don't mind the ASD. I need someone to drive my car so I can actually hear how the car sounds. I haven't had the pleasure of meeting anyone in my area with an M3 yet.

[Spiffx]

Originally Posted by Encanto

Is this a serious question?

Yes. My rationale: if turning off ASD physically closes mechanical components (valves, as described before) I would assume that could have an impact on performance. However, I don’t know enough about car mechanics to determine if those ”valves” only control sound and don’t affect exhaust.

So yes, this is a serious question. Call me a noob, I’m just no expert and would like to know the answer.

I already read further above in this thread that turning off ASD turns off the audio engine sound inside, but also closes the valves to reduce sound outside. I also read that some people have used a coder to decouple the two. I just don’t know if that’s the case with Murf.

[Spiffx]

Originally Posted by Spiffx

Yes. My rationale: if turning off ASD physically closes mechanical components (valves, as described before) I would assume that could have an impact on performance. However, I don’t know enough about car mechanics to determine if those ”valves” only control sound and don’t affect exhaust.

So yes, this is a serious question. Call me a noob, I’m just no expert and would like to know the answer.

I already read further above in this thread that turning off ASD turns off the audio engine sound inside, but also closes the valves to reduce sound outside. I also read that some people have used a coder to decouple the two. I just don’t know if that’s the case with Murf.

Discard. I just went back and realized Murf was the one who used bimmercode to decouple the two.

Question still stands: if I turn off ASD on a stock M4 (i.e., no bimmercode changes) would performance be affected?

[Encanto]

Originally Posted by Spiffx

Yes. My rationale: if turning off ASD physically closes mechanical components (valves, as described before) I would assume that could have an impact on performance. However, I don’t know enough about car mechanics to determine if those ”valves” only control sound and don’t affect exhaust.

So yes, this is a serious question. Call me a noob, I’m just no expert and would like to know the answer.

I already read further above in this thread that turning off ASD turns off the audio engine sound inside, but also closes the valves to reduce sound outside. I also read that some people have used a coder to decouple the two. I just don’t know if that’s the case with Murf.

The ASD is the synthesized engine sound software in the RAM, the exhaust valves solenoids are controlled by the ECU as part of the external noise level control due to environmental regulations. Their relation is that ASD was created to compensate for the reduction of external exhaust sound getting into the cockpit. Nothing to do with actual performance, just noise and sound.

[Spiffx]

Originally Posted by Encanto

The ASD is the synthesized engine sound software in the RAM, the exhaust valves solenoids are controlled by the ECU as part of the external noise level control due to environmental regulations. Their relation is that ASD was created to compensate for the reduction of external exhaust sound getting into the cockpit. Nothing to do with actual performance, just noise and sound.

Thank you. Much appreciated!

[Spiffx]

Where I grew up I remember people removing or replacing the exhaust silencer to improve performance. Thus I thought perhaps closing the exhaust valves could affect performance. Thanks for clarifying that it doesn’t.

[Encanto]

Originally Posted by Spiffx

Where I grew up I remember people removing or replacing the exhaust silencer to improve performance. Thus I thought perhaps closing the exhaust valves could affect performance. Thanks for clarifying that it doesn’t.

The real choke point of a modern exhaust is before the muffler valves… the cat (primary and secondary), the resonators and the muffler itself. The new exhaust particle filters are more pronounced in affecting performance, as you can see the difference in horsepower output between US models without it and European with it.

[ChrisM4]

Originally Posted by PLF69

Also sounds much better and less drony than in my M2, I'm fine with the combined button.

ASD in my old M2 drove me crazy. It's much improved in the M4 but I'm still going to code it out.

[Steveo]

I coded ASD off with BimmerCode and in Sport mode is definitely off.
But in Sport+ mode, it sounds like it’s on and can hear it changing inside the cabin.
How is this possible?

I also have the exhaust flap wired fully open/actuators removed,
So the flaps are not moving.

[Patton250]

Originally Posted by Steveo

I coded ASD off with BimmerCode and in Sport mode is definitely off.
But in Sport+ mode, it sounds like it’s on and can hear it changing inside the cabin.
How is this possible?

I also have the exhaust flap wired fully open/actuators removed,
So the flaps are not moving.

I would buy the OBD Bluetooth device and bimmer code just to get rid of this one thing but it sounds like no one‘s having any success including yourself. At least not 100% success.

[Murf]

Damn I think you're right they borked the ASD coding. I had turned it back on after the BMW software update was pushed out, in order to see what they had changed with the exhaust sound. Went to code it back off yesterday and there is no change at all in sound despite Bimmercode saying ASD is inactive. Has anyone pinged the Bimmercode devs about this?

[DoubleDave]

Originally Posted by Murf

Damn I think you're right they borked the ASD coding. I had turned it back on after the BMW software update was pushed out, in order to see what they had changed with the exhaust sound. Went to code it back off yesterday and there is no change at all in sound despite Bimmercode saying ASD is inactive. Has anyone pinged the Bimmercode devs about this?

It’s been talked about a lot in the dedicated Bimmercode thread. TLDR version is if you had it coded off before and got the new software update, you’ll need the Testflight version of the app and an activation code to turn it off.

Reach out to Bimmercode support through the app.

[snareman]

Originally Posted by DoubleDave

It’s been talked about a lot in the dedicated Bimmercode thread. TLDR version is if you had it coded off before and got the new software update, you’ll need the Testflight version of the app and an activation code to turn it off.

Reach out to Bimmercode support through the app.

One of many reasons I haven't allowed my car to do the upgrade.

[DoubleDave]

Originally Posted by snareman

One of many reasons I haven't allowed my car to do the upgrade.

It would be awesome if Bimmercode could incorporate the code into the regular version of the app.

[snareman]

Originally Posted by DoubleDave

It would be awesome if Bimmercode could incorporate the code into the regular version of the app.

It would be awesome if BMW could incorporate it into the CAR. But that's closer to beating a dead horse.

[DoubleDave]

Originally Posted by snareman

It would be awesome if BMW could incorporate it into the CAR. But that's closer to beating a dead horse.

Yeah, they don’t seem interested in giving us full control over the fake sound and exhaust valves. So far it’s the only thing I don’t like about the car.

[M0J0]

I turned it off last night and the road noise got significantly louder. I am turning it back on.