Valve Disconnect

[DreamTFK]

Ran a search here and came up empty. Found a few videos about the sound after this mod but not much about it being done or any errors it might produce.

Crawled under and found where they are. Definitely difficult to reach but seems doable. Anyone have any tricks to share on releasing it without breaking it?

https://imgur.com/a/tTDe7dl

[javbomb]

Ran a search here and came up empty. Found a few videos about the sound after this mod but not much about it being done or any errors it might produce.

Crawled under and found where they are. Definitely difficult to reach but seems doable. Anyone have any tricks to share on releasing it without breaking it?

https://imgur.com/a/tTDe7dl

Results in soft code errors for sure, and if it's anything like the RS3, you will have power pulled on the top end to protect the engine, I can't 100% confirm that you will lose power, you would need a dyno sheet to prove it, but that's my guess.

I did it, and didn't really notice anything, the sound seemed exactly the same as when the car was in dynamic anyway.

On the RS3 however the difference was massive and I ran without plugs via using a proper terminator kit for about 2 years. On this car, I plugged them back in within a day because I was pretty sure the sound was the same.

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[BrockDM]

Results in soft code errors for sure, and if it's anything like the RS3, you will have power pulled on the top end to protect the engine, I can't 100% confirm that you will lose power, you would need a dyno sheet to prove it, but that's my guess.

I did it, and didn't really notice anything, the sound seemed exactly the same as when the car was in dynamic anyway.

On the RS3 however the difference was massive and I ran without plugs via using a proper terminator kit for about 2 years. On this car, I plugged them back in within a day because I was pretty sure the sound was the same.

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Why would you lose power on the top end from keeping the exhaust valves open? They stay open while the car is in Dynamic mode so how would that make sense.

Unplugging them keeps them open at all times. (Start up, comfort, "D" transmission etc.) It doesn't make it any louder than it was before.

OP: Gently pop the gray locking tab upwards to unlock. Press the gray tab down and pull. Very simple.

[javbomb]

Why would you lose power on the top end from keeping the exhaust valves open? They stay open while the car is in Dynamic mode so how would that make sense.

Unplugging them keeps them open at all times. (Start up, comfort, "D" transmission etc.) It doesn't make it any louder than it was before.

OP: Gently pop the gray locking tab upwards to unlock. Press the gray tab down and pull. Very simple.

Because there is an error code. The car sends a signal to open the valves but the valve doesn't respond, so according to the car your valves could well be stuck closed. The physical position does not matter if the car assumes electrically there could be an issue.

I am not saying this from nowhere it's a proven fact on the RS3 that the car pulls a shit ton of power on the dyno unless you use the proper jumper plug to terminate the loop.

Until someone dynos an S4 and shows a normal power graph with unplugged valves I am going to assume the same since this car is even newer.

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[Nora2004]

I unplugged mine last week, driving it sounded exactly the same, cold start was unbearable at 4am!

Unplugging resulted in 2 error codes as expected, before reading this I also felt a drop in power, either a drop in boost or timing pull, I didn't have the time to log the data to see what the ECU was doing before plugging them back in! If I get time in the next week I'll do back to back datalogs to see if the ECU is actually pulling boost or timing!

[DreamTFK]

I did it, and didn't really notice anything, the sound seemed exactly the same as when the car was in dynamic anyway.

Well that is the point for me, not for it to be any louder. I don't see how that would be possible. I would like the dynamic sound without being in dynamic mode all the time.

I always thought that normal drive mode gets you better mpg but can't say I know that to be true. Is it?

[Denali]

Because there is an error code. The car sends a signal to open the valves but the valve doesn't respond, so according to the car your valves could well be stuck closed. The physical position does not matter if the car assumes electrically there could be an issue.

The valves on the S4 are fail-open and only close when power sent to the solenoid in the valve actuator. This is evident as the valve stays in the open position when the car is not running. The fail-open position is safer for the engine compared to the fail closed position, which has the potential to push exhaust manifold pressure into unsafe pressure at high RPM. The ECU likely assumes the valve is always open. When it commands a valve to close and it does not receive feedback from the actuator, then it continues to assume the valve is open.

It throws a soft code on the car but I did not feel any decrease in power when I had the valves on mine unplugged.

[BrockDM]

Because there is an error code. The car sends a signal to open the valves but the valve doesn't respond, so according to the car your valves could well be stuck closed. The physical position does not matter if the car assumes electrically there could be an issue.

I am not saying this from nowhere it's a proven fact on the RS3 that the car pulls a shit ton of power on the dyno unless you use the proper jumper plug to terminate the loop.

Until someone dynos an S4 and shows a normal power graph with unplugged valves I am going to assume the same since this car is even newer.

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Ahh okay, I missed the correlation between the soft code and loss of power. I see what you are saying now. There are quite a few people running around with the valves disconnected, maybe the same principals don't apply to the S4/S5? Idk

[BrockDM]

Well that is the point for me, not for it to be any louder. I don't see how that would be possible. I would like the dynamic sound without being in dynamic mode all the time.

I always thought that normal drive mode gets you better mpg but can't say I know that to be true. Is it?

Yes, "D" provides the best mpg but that is because it doesn't hold high RPMs and it shifts into 8th gear. "S" will hold higher RPMs and will not shift into 8th gear resulting in a lower mpg.

[DreamTFK]

Yes, "D" provides the best mpg but that is because it doesn't hold high RPMs and it shifts into 8th gear. "S" will hold higher RPMs and will not shift into 8th gear resulting in a lower mpg.

Ok cool, thanks. I would really like to know if this top end power hit is for real. Not that I will hit the top end very often.

[javbomb]

The valves on the S4 are fail-open and only close when power sent to the solenoid in the valve actuator. This is evident as the valve stays in the open position when the car is not running. The fail-open position is safer for the engine compared to the fail closed position, which has the potential to push exhaust manifold pressure into unsafe pressure at high RPM. The ECU likely assumes the valve is always open. When it commands a valve to close and it does not receive feedback from the actuator, then it continues to assume the valve is open.

It throws a soft code on the car but I did not feel any decrease in power when I had the valves on mine unplugged.

The RS3 works the same way, and yet it pulls power.

You cannot insist there is no power loss without proof, just the same as I can't say it will pull power with 100% certainty, however the RS3 is proven to do so and I can show you dyno logs to prove it, and it uses an almost identical valve system. Therefore my original warning is pretty valid.

It's only on the top end maybe about 3750rpm on the RS3 and it's not like it's 100hp, more like 40-50hp but it's easily there on a dyno graph and it's not subtle, but your butt dyno may struggle to pick up the power loss.

If anything, the sheer possibility of it means someone should put it on a dyno and see, or run some 0-100 times with and without valves.

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[javbomb]

Here are 3 RS3 dyno graphs, notice the drop...



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[BrockDM]

Ok cool, thanks. I would really like to know if this top end power hit is for real. Not that I will hit the top end very often.

I personally would not make that sacrifice just to have the valves open all the time.

[HyperM3]

I've had my valves disconnected because I was getting the rattle noise. Unplugging made it go away. Plus I have a resonator delete so it sounds perfect to me now.

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[DreamTFK]

Digging this back up. With all of the downtime lately I was thinking about giving this a shot. I can see the plug on one side but it's hard to tell how to engage and remove it.

Anyone who has done this can give any advice? Removing the diffuser would probably make it easier but really don't feel like doing that.

[HyperM3]

Digging this back up. With all of the downtime lately I was thinking about giving this a shot. I can see the plug on one side but it's hard to tell how to engage and remove it.

Anyone who has done this can give any advice? Removing the diffuser would probably make it easier but really don't feel like doing that.

It's a pita. I've done it a few times now and it doesn't get easier.

Each clip has a little grey tap that you have to pull back on a couple 8ths of an inch. Once that's pulled back, you need to press down and pull the clip back at the same time. If you have a little mirror you can get up in there it makes it easier to see what I'm talking about.

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[DreamTFK]

It's a pita. I've done it a few times now and it doesn't get easier.

Each clip has a little grey tap that you have to pull back on a couple 8ths of an inch. Once that's pulled back, you need to press down and pull the clip back at the same time. If you have a little mirror you can get up in there it makes it easier to see what I'm talking about.

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Thank you. Yes I saw that this one is different than the normal connectors found under the hood with the black release lever. Is there only one to unplug?

[DreamTFK]

So I just read this article and I do have my drive setting custom with engine sound in Dynamic but I still notice a difference when I put the drive mode into 'S' (full dynamic).

I am wondering now if disconnecting my valves will do anything at all in normal drive mode since I already have the sound set to Dynamic.

https://www.audizine.com/forum/showt...-Trans-setting!

[SHCKR]

So I just read this article and I do have my drive setting custom with engine sound in Dynamic but I still notice a difference when I put the drive mode into 'S' (full dynamic).

I am wondering now if disconnecting my valves will do anything at all in normal drive mode since I already have the sound set to Dynamic.

https://www.audizine.com/forum/showt...-Trans-setting!

I can tell the difference as well

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[DreamTFK]

I can tell the difference as well

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You have your valve disconnected and still hear a difference in full dynamic or are you saying you have engine sound on Dynamic but still hear a difference when in full dynamic?

[DreamTFK]

Ok so I popped it off last night. Thanks for the tip Hyper, it came off relatively easy but reaching it was a pain.

Backed the car up on some Gorilla ramps to give me more elbow room.

[HyperM3]

Ok so I popped it off last night. Thanks for the tip Hyper, it came off relatively easy but reaching it was a pain.

Backed the car up on some Gorilla ramps to give me more elbow room.

There's one on both sides, not sure if you got the other one too.

On the driver side it's before the two tips. On the passenger side it's on one of the tips directly.

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[DreamTFK]

There's one on both sides, not sure if you got the other one too.

On the driver side it's before the two tips. On the passenger side it's on one of the tips directly.

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Oh wow I did not know that. I will crawl back under and take a look, thank you.

[DreamTFK]

Ok so driver side disconnected as well. Both plugs (male and female sides) electrical tape wrapped and zip tied to the body.

When I put it into full dynamic I still hear a tone difference and it sounds generally deeper so I am not sold on disconnecting the valves as a solution to permanently "turning on" the full dynamic sound even in normal drive mode.

Of course the intake is ready to be installed and HFC is on the short list of next upgrades so I know that combo will add more sound.

[HyperM3]

Ok so driver side disconnected as well. Both plugs (male and female sides) electrical tape wrapped and zip tied to the body.

When I put it into full dynamic I still hear a tone difference and it sounds generally deeper so I am not sold on disconnecting the valves as a solution to permanently "turning on" the full dynamic sound even in normal drive mode.

That's because when the transmission changes to S from D, it raises the RPM which in turn changes the tone.

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[javbomb]

Has anyone put the car on a dyno and tested if you lose power with the valves disconnected yet?

[OverBoosted]

Here are 3 RS3 dyno graphs, notice the drop...



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I'm having a hard time buying into the theory that open valves are causing a dip in power. This would mean any aftermarket exhaust without valves would be losing power since most ditch them. The middle dyno chart shows the dip in power likely to timing pull and the A/F going rich at the same time. Are these all from the same car or different cars with different setups?

[HyperM3]

I'm having a hard time buying into the theory that open valves are causing a dip in power. This would mean any aftermarket exhaust without valves would be losing power since most ditch them. The middle dyno chart shows the dip in power likely to timing pull and the A/F going rich at the same time. Are these all from the same car or different cars with different setups?

It's been proven on the RS3 and GolfR but not on the S4/5 yet. I have run multiple ways multiple times and I can't tell a drop in power.

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[DreamTFK]

I think it's rare that I am able to hit those peaks. I work from home a lot (even before the virus) and most driving is city so not many opportunities to WOT.

I rather have the extra sound. Maybe after a HFC I may close them back up.

[javbomb]

I'm having a hard time buying into the theory that open valves are causing a dip in power. This would mean any aftermarket exhaust without valves would be losing power since most ditch them. The middle dyno chart shows the dip in power likely to timing pull and the A/F going rich at the same time. Are these all from the same car or different cars with different setups?

They dont ditch them, at least on the RS3, they either have valves, or they come with terminators. Or they tell you to stow your valve somewhere in the instructions.

Its a very real thing and measured countless times on the RS3 by lots of different people in different countries.

I had an RS3, so I am quite suspicious that the S4 pulls power too. I used valve terminator plus on my RS3, and the sound increase was wicked, I dont actually notice much of any difference in the sound on the S4.

If the S4 doesnt pull power, then great, I would run them unplugged for sure. This is a very quiet car for me. It is stock though right now.

[YoYo]

Anyone tried the fuse like the RS5/S5 guys are doing? Maybe I should go check my fuse panel before I even post, but just wanted to see. I still have mine plugged in, but if I can just pull a fuse I'm down to try that real quick.

The diagram I found shows that fuse as: 3 Exhaust doors, fuel injectors, radiator inlet
So I'm not so sure.

[non-polarbear]

I don't believe that you can yank a fuse and only have the valves disabled. I forget exactly what else they are in the same circuit with but they are definitely not on a cirsuit by themselves. To pull the plugs on the valves takes like 4 min, and is easily reversible, just give that a shot. I unplugged mine two months or so after getting it and havent felt the need to plug them back in.

2020 S4 Premium Plus Black Optics S Sport Package

[YoYo]

You can on the RS5 and S5. Go check that thread.

I don't believe that you can yank a fuse and only have the valves disabled. I forget exactly what else they are in the same circuit with but they are definitely not on a cirsuit by themselves. To pull the plugs on the valves takes like 4 min, and is easily reversible, just give that a shot. I unplugged mine two months or so after getting it and havent felt the need to plug them back in.

2020 S4 Premium Plus Black Optics S Sport Package

[BaggedB9S4]

I had a friend put my car in Drive and S, while holding the brakes. I crawled under and disconnected driver side valve while it was open, I have the ECS X Pipe. The passenger side valve you can see if it is opened or closed, just shine a flashlight in the exhaust. This way I only get drone on the highway in S, which I switch to D the pass valve closes and it shift to a lower gear. nice and quiet.

[Sebastian Tu]

So I did a thing...
I unplugged the drivers valve, and tried to unplug the passengers, but it wouldn't give. At one point, I pulled what felt like cover over the part back and thought I broke it... so I shoved that guy back in....
The valves still work and I guess I didn't break it, but now when it cold starts, it closes the valves in dynamic as usual until it lowers to idle, but when it lowers, it still remains closed. I have to change to comfort, and back to dynamic and then it'll open.
All this is still in park by the way.

I swear it used to open the valves automatically when it lowered to idle in dynamic mode. Am I going crazy?

[JimmyS3]

So here is how my car worked... When I start the car in Dynamic, the transmission in park the car will be in normal "D" drive mode while in park when just started. The valve will go from open to closed in a couple seconds. Once I reverse out and put in drive the car, even while it's in dynamic will show "D" in the display until I push back on shifter then the transmission will be in "S" mode with the valve open.

I currently have the valves open so it doesn't matter.

If you have a flash light you can see the valve thought the exhaust tip on the outer tip I believe on each side. Passenger one is easier to see as driver side sits a little further back.

[DreamTFK]

I could be wrong but I don't think it will happen in park. Even at low RPM's I am not sure if it does.

[rkw723]

Hello all,
Sorry to hijack the thread, but I need your help.

I have a new 2022 Macan S and need some help with my exhaust flapper valve actuator (so I can install the muffler delete Soul exhaust).
New for 2022, the valve actuator is 4 pin, whereas for prior Macan gens it was 3 pin.
If I disconnect (unplug) the valve actuator, I'll throw two codes (P0475 and P048E). Both are exhaust pressure, sensing flapper valve open/closed.
Found one source (Burger Tuning) that has a 4 position plug/terminator (application noted it's for RS3/RS4/RS5 and other Audi); but unfortunately it didn't work on my Macan. Code P0475 didn't come up but P048E will still always come up.
My 2.9L engine is same as RS4/RS5 and we both have 4 pin exhaust actuators. I'm hoping someone can help me with some other sources or knowledge of 4 pin exhaust actuator delete plugs. I have a 2022 Macan exhaust wiring diagram showing the 4 pins, but I don't know which ones should be jumpered (shorted) or a resistor added. The Burger plug has a 2.7k resistor between pins 2 & 3.

Thanks in advance for any help

[INS4NE_B9]

So I did a thing...
I unplugged the drivers valve, and tried to unplug the passengers, but it wouldn't give. At one point, I pulled what felt like cover over the part back and thought I broke it... so I shoved that guy back in....
The valves still work and I guess I didn't break it, but now when it cold starts, it closes the valves in dynamic as usual until it lowers to idle, but when it lowers, it still remains closed. I have to change to comfort, and back to dynamic and then it'll open.
All this is still in park by the way.

I swear it used to open the valves automatically when it lowered to idle in dynamic mode. Am I going crazy?

This is normal - you might be going crazy.

Hello all,
Sorry to hijack the thread, but I need your help.

I have a new 2022 Macan S and need some help with my exhaust flapper valve actuator (so I can install the muffler delete Soul exhaust).
New for 2022, the valve actuator is 4 pin, whereas for prior Macan gens it was 3 pin.
If I disconnect (unplug) the valve actuator, I'll throw two codes (P0475 and P048E). Both are exhaust pressure, sensing flapper valve open/closed.
Found one source (Burger Tuning) that has a 4 position plug/terminator (application noted it's for RS3/RS4/RS5 and other Audi); but unfortunately it didn't work on my Macan. Code P0475 didn't come up but P048E will still always come up.
My 2.9L engine is same as RS4/RS5 and we both have 4 pin exhaust actuators. I'm hoping someone can help me with some other sources or knowledge of 4 pin exhaust actuator delete plugs. I have a 2022 Macan exhaust wiring diagram showing the 4 pins, but I don't know which ones should be jumpered (shorted) or a resistor added. The Burger plug has a 2.7k resistor between pins 2 & 3.

Thanks in advance for any help

Check out this thread: https://www.audizine.com/forum/showt...ete-Simulators

[bamer02]

Hello all,
Sorry to hijack the thread, but I need your help.

I have a new 2022 Macan S and need some help with my exhaust flapper valve actuator (so I can install the muffler delete Soul exhaust).
New for 2022, the valve actuator is 4 pin, whereas for prior Macan gens it was 3 pin.
If I disconnect (unplug) the valve actuator, I'll throw two codes (P0475 and P048E). Both are exhaust pressure, sensing flapper valve open/closed.
Found one source (Burger Tuning) that has a 4 position plug/terminator (application noted it's for RS3/RS4/RS5 and other Audi); but unfortunately it didn't work on my Macan. Code P0475 didn't come up but P048E will still always come up.
My 2.9L engine is same as RS4/RS5 and we both have 4 pin exhaust actuators. I'm hoping someone can help me with some other sources or knowledge of 4 pin exhaust actuator delete plugs. I have a 2022 Macan exhaust wiring diagram showing the 4 pins, but I don't know which ones should be jumpered (shorted) or a resistor added. The Burger plug has a 2.7k resistor between pins 2 & 3.

Thanks in advance for any help

Getting the same codes as you. Did you ever get it fixed?