[SC-P*]

Great write up and pics (except for the blurry before pic

Just wondering, to get it back to normal, do you just plug them back together? Incase wifey gets annoyed with the cold starts waking her up. Everyone has commented on the drastic change in loudness between D ans S mode.

@mikey32235 - I understand the Ms also has the same issue - on the cold starts there are flaps that are closed - and some BMW owners also do a similar mod to get the right cold start sound!

 

[motorhead]

Sorry, I grabbed a bad shot. This is a little better.

And yes, you can just reconnect them when your wife complains and it will revert to normal operation the next time you start the car. Keep in mind that once you know how it's done, it's a quick enough task to do if only for that weekly solo drive to Home Depot.

I only run it this way occasionally myself and you can lock it in any one of several flap positions. I'll get some crap for this, but I usually have mine set in the fully closed position. I actually love the way this car sounds running up through the gears in manual mode when set that way and it still goes like stink. [emoji38]

 

[Hennie1981]

I'm experiencing the same thing as described earlier.
It seems the valves are open all the time, even in normal D mode.
Sounds great, but this is not normal
Cold start is VERY loud, louder than previously.

The valves don't seem to pop back into place for the moment. What can I do? Software related or do I need to stick a screwdriver in there?

thanks

 

[TomOldi]

I'm experiencing the same thing as described earlier.
It seems the valves are open all the time, even in normal D mode.
Sounds great, but this is not normal
Cold start is VERY loud, louder than previously.

The valves don't seem to pop back into place for the moment. What can I do? Software related or do I need to stick a screwdriver in there?

thanks

Do they close, after switching D Mode to S an back to D?
Mine are open, if the engine was hot, when parking and having warm weather ... was like this, from the beginning.
Never happens during the winter time.

 

[Hennie1981]

Do they close, after switching D Mode to S an back to D?
Mine are open, if the engine was hot, when parking and having warm weather ... was like this, from the beginning.
Never happens during the winter time.

You fixed it! I switched to Sport (while driving) and put it back in D somewhat later. And it sounded normal again.
I kinda liked the sound before too but don't like driving around knowing that it is not the way it should be. And the cold start was really insane
The growl at warm startup was pretty cool though...

 

[v60paulstar]

This sounds exactly what I originally posted, sounds unreal on start up and really good driving but it lasted a few journeys and corrected itself once you go to sport and back, must be sticking valves for whatever reason, maybe some wd40 might do the trick.


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[Warpedcow]

Sure. As previously mentioned, secure the vehicle with the parking brake and wheel chalks, then put the transmission in sport.

Lift the cargo floor and secure it with the strap. Pull the lower tray out a little and you'll see two black connectors all the way forward, center left. These route directly to each exhaust actuator. To remove, there is a tab at the base that you need to press in with light pressure, then a light pull on the connector to release. These release very easily, so if it's not letting go you're not doing it right.

You can disconnect them in either order, but you should disconnect both. The actuators are CAN bus controlled so you can disconnect them without damaging anything electrical, but they operate together and not independently.

That's it. The actuators will stay fixed in position and your entire neighborhood will know when you're starting your car. It's seriously loud on cold start fast idle...

Do you know which plug controls which valve? I want to experiment with leaving the muffler bypass valve open but allowing the other one to run normally (or force it "closed").
I circled the two plugs with red and blue. Does anyone know which is which?

 

[motorhead]

It doesn't work that way. The controllers on the mufflers are CAN bus controlled, and while I haven't experimented with individual wires, if you disconnect either of these connectors, then both muffler flaps will remain in their then-current positions.

As far as I can tell, there are 4 possible muffler actuator states that you can lock into while the car is idling normally (e-brake and chalked wheel of course) by disconnecting either connector. But the actuators seem to creep over time and need to be reset occasionally by reconnecting and disconnecting again.

Both fully open (transmission in Sport); Very loud cold start and sounds great reving in neutral, but drones a bit in drive
)
Left closed, right fully open (transmission in Park); Nice middle ground exhaust note, especially mid rpm range
Both fully closed (transmission in Reverse); Very quiet in all conditions
Flaps partially open (transmission in Drive); Normal non-sport exhaust note

There are dynamic actuator positions that you will of course lock yourself out of, such as normal sport/drive switching, cold start and high rpm activation in Drive, but I haven't noticed any drivability issues from any of these locked positions.

 

[After_Shock]

With a Ferrita DP and both open the car is ridiculously loud, do expect to get pulled by the police with this setting!

 

[Warpedcow]

It doesn't work that way. The controllers on the mufflers are CAN bus controlled, and while I haven't experimented with individual wires, if you disconnect either of these connectors, then both muffler flaps will remain in their then-current positions.

As far as I can tell, there are 4 possible muffler actuator states that you can lock into while the car is idling normally (e-brake and chalked wheel of course) by disconnecting either connector. But the actuators seem to creep over time and need to be reset occasionally by reconnecting and disconnecting again.

Both fully open (transmission in Sport); Very loud cold start and sounds great reving in neutral, but drones a bit in drive
)
Left closed, right fully open (transmission in Park); Nice middle ground exhaust note, especially mid rpm range
Both fully closed (transmission in Reverse); Very quiet in all conditions
Flaps partially open (transmission in Drive); Normal non-sport exhaust note

There are dynamic actuator positions that you will of course lock yourself out of, such as normal sport/drive switching, cold start and high rpm activation in Drive, but I haven't noticed any drivability issues from any of these locked positions.

So "Left" is the "muffler bypass" valve? If so, doesn't seem like there is any way I could get it "stuck" in my desired position... (Left = Open, Right = Closed)

 

[motorhead]

I don't know which one is left and which one is right, but it's easy enough to check as the you can trace the wires under the carpet. It may be possible to get what you're looking for by first switching the connectors, putting the car in Park and then disconnecting both. That normally opens the right side but should open the left if swapped around.

The question is whether or not swapping these would damage anything but they're not keyed differently or marked, so maybe not.

 

[v60paulstar]

So "Left" is the "muffler bypass" valve? If so, doesn't seem like there is any way I could get it "stuck" in my desired position... (Left = Open, Right = Closed)

There is a plug for right valve and a plug for left valve, the two outer wires on each plug are power (+-) the middle orange/white and orange is the can bus control (9-11v).

You can just unplug them but you lose all oem functions.

I purchased a Remus box and wired it so you have one switch, switch on and the Remus takes over, press switch off and you have normal functions, this way you can be in normal D and have both valves open.

Works well.

I did post the details on the P* FB page

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[OscarII]

Would you be willing to post it here for those of us who don't do FB?

 

[Warpedcow]

Would you be willing to post it here for those of us who don't do FB?

Or also for those of us here who are still waiting on the slacker FB admins to accept the join request?

 

[v60paulstar]

Would you be willing to post it here for those of us who don't do FB?

Hi J, yes no problem. I'll post it shortly

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[OscarII]

My right exhaust seems to be "stuck" open. I pulled the actuator off and the clapper valve is rotating smoothly so it must be the actuator or the signal to the actuator.

 

[motorhead]

So "Left" is the "muffler bypass" valve? If so, doesn't seem like there is any way I could get it "stuck" in my desired position... (Left = Open, Right = Closed)

I was able to lock the positions that you're looking for. I tried switching the flapper connectors and they still actuate per the normal programming, just swapped around. So to lock the left open and the right closed, reverse the connectors, start the car and while in Park, disconnect them both (either one first as the order doesn't matter). The left flap will now be locked open and the right closed. By the way, if you leave them connected but reversed, Sport sounds the same but Drive is a bit louder with the left side exhaust partially open verses the right side.

EDIT: I drove it with the left side locked open and right closed for about an hour today and much prefer the standard Sport setting. This is almost as loud but sounded rather flat. If you want to lock the exhaust to a single all around setting, try the right locked open instead (as described in my previous post). A bit weak on idle but an especially nice mid range tone that gets masked a little in the normal Sport mode.

 

[myvolvodream]

Or also for those of us here who are still waiting on the slacker FB admins to accept the join request?

Precious

 

[Warpedcow]

I was able to lock the positions that you're looking for. I tried switching the flapper connectors and they still actuate per the normal programming, just swapped around. So to lock the left open and the right closed, reverse the connectors, start the car and while in Park, disconnect them both (either one first as the order doesn't matter). The left flap will now be locked open and the right closed. By the way, if you leave them connected but reversed, Sport sounds the same but Drive is a bit louder with the left side exhaust partially open verses the right side.

EDIT: I drove it with the left side locked open and right closed for about an hour today and much prefer the standard Sport setting. This is almost as loud but sounded rather flat. If you want to lock the exhaust to a single all around setting, try the right locked open instead (as described in my previous post). A bit weak on idle but an especially nice mid range tone that gets masked a little in the normal Sport mode.

I did this now as well - marked the plugs so I can tell if they are "swapped" or not - then swapped them, started it put, put it in park - unplugged. It's nice having just the bypass open. You get the growl but less of the drone/hum that you get with both open.

 

[OscarII]

So I am confused. My right is open after cold start. I can actually hear it open when the revs fall. My preference is both closed for D, and both open for S. Anyway to configure them this way?