A3 to S3 exhaust valve retrofit

[chillybone]

Hello!

I am doing a exhaust valve retrofit on our 2018 A3 and was wondering if anyone has done this before.

We are planning on buying the APR S3 Catback and installing since it will bolt up no problem from what I can see.
The only issue is we would want the exhaust valves to work with the MMI.

Hopefully im not the guinea pig of this project. =)

We do not want the valves stuck open or closed. So that idea is out.

[jnhalstead]

gonna assume you have a quattro, cause FWD will not bolt up with S3

[Drkstorm]

It looks like the APR system has a place to connect the active valve actuator so I wouldn’t see why not, but any reason you want the Apr system specifically?

[chillybone]

I have a Quattro.

The apr system to me looks like a very high quality system and that is what I’m looking for. I also like the way it sounds.

I had a awe system awhile back and I was over replacing sections once a year.

I’m it to worried about the fitment. I’m just wondering if anyone has retrofitted the valves and wired them up to work with the cars drive select

Also...... I’m a apr fan boi


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[mroberte]

I have a Quattro.

The apr system to me looks like a very high quality system and that is what I’m looking for. I also like the way it sounds.

I had a awe system awhile back and I was over replacing sections once a year.

I’m it to worried about the fitment. I’m just wondering if anyone has retrofitted the valves and wired them up to work with the cars drive select

Also...... I’m a apr fan boi


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Did you ever end up doing this?

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[chillybone]

Yes this is all done


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[mroberte]

Yes this is all done


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Did you connect this directly to the ECU or just use the apr system as a standalone and use the remote?

I'm trying to figure out where/which wire to tap into for the pwm signal that controls the valves.

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[chillybone]

We went with the stock S3 exhaust for now until we can buy the APR one but yes we wired the valves right into the ECU. I had a friend who is a master Audi tech do the job and wired it factory

[mroberte]

We went with the stock S3 exhaust for now until we can buy the APR one but yes we wired the valves right into the ECU. I had a friend who is a master Audi tech do the job and wired it factory

Ahh, I'll keep digging to see where the connection is located. I think it's the drivers footwell and the red connector, just need confirmation before I go on the hunt.

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[QuadRings]

Damn, I'm about to pickup a stock S3 exhaust for my A3 and was hoping someone else could provide some input. The APR standalone still needs wiring done, because it needs power to operate.

[kennyc811]

Ahh, I'll keep digging to see where the connection is located. I think it's the drivers footwell and the red connector, just need confirmation before I go on the hunt.

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Did you ever end up figuring this out? Looking to do the same on my A3.

[chillybone]

Hopefully this helps

- - - Updated - - -

jeez how in the world do you upload photos on this. i have the wire diagram

[mroberte]

Did you ever end up figuring this out? Looking to do the same on my A3.

I haven't gotten around to it, but I believe I need to connect directly to the ecu if looking at the wiring diagram.

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[chillybone]

Yes the flap signal wire needs to be wired right to the ecu

[mroberte]

Yes the flap signal wire needs to be wired right to the ecu

Did you get it all wired up and functioning? Mmi control too?

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[chillybone]

They are wired up oem and coded but the mmi never controlled them. Tested in the s3 and it was the stupid engine noise maker that you can control not the valves.


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[mroberte]

They are wired up oem and coded but the mmi never controlled them. Tested in the s3 and it was the stupid engine noise maker that you can control not the valves.


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Ahh, I thought if you put into comfort mode it would keep them closed. I'll need to get this finished sometime soon. Glad to see it's working for you tho!

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[[email protected]]

I have worked with CETE on adding valve control to several A models, A6 and A8. You would want factory drive select to be able to retrofit. If anyone is interested please don't hesitate to shoot me an email: [email protected]

Cheers,

[chillybone]

You would be able to control the valves through the MMI?

[[email protected]]

You would be able to control the valves through the MMI?

So long as you currently have drive select settings such as comfort, auto, dynamic, then yes you are able to control the valves through the MMI. They would behave like how a CETE valve controller works on an S3:

- Dynamic - Valves are Fully Open at All RPM
- Automatic - Standard Factory Valve Behavior
- Comfort - Valves Remain Closed until 5000rpm
- ESP Double Tap - Immediate Closing or Opening of Valves

Cheers,

[mroberte]

So long as you currently have drive select settings such as comfort, auto, dynamic, then yes you are able to control the valves through the MMI. They would behave like how a CETE valve controller works on an S3:

- Dynamic - Valves are Fully Open at All RPM
- Automatic - Standard Factory Valve Behavior
- Comfort - Valves Remain Closed until 5000rpm
- ESP Double Tap - Immediate Closing or Opening of Valves

Cheers,

Good to know about the esp, thank you for this info.

You def can get Drive select retrofitted if not on the car... I bought the retrofit from the dealership online... The hardest part was then finding another dealership willing to do the swop coding part.

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[spacecase]

Good to know about the esp, thank you for this info.

You def can get Drive select retrofitted if not on the car... I bought the retrofit from the dealership online... The hardest part was then finding another dealership willing to do the swop coding part.

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Mind sharing the retrofit part number?

[chillybone]

8V0063765 for auto it says

[Motohip]

I'm looking to do this to my A3. I have the exhaust already. Did you buy a wiring harness?

[desert_rs]

So long as you currently have drive select settings such as comfort, auto, dynamic, then yes you are able to control the valves through the MMI. They would behave like how a CETE valve controller works on an S3:

- Dynamic - Valves are Fully Open at All RPM
- Automatic - Standard Factory Valve Behavior
- Comfort - Valves Remain Closed until 5000rpm
- ESP Double Tap - Immediate Closing or Opening of Valves

Cheers,

Hey Alexander, apologies for raising an old old, but I have a problem based on a similar topic:
I have an 8S 2016 TT Quattro. Recently I retrofitted the TTS exhaust with valves.
Successfully wired the valves to the ECU and activated them in the 01 module. The signal is coming from the ECU to both of the valves and they respond.
Issue - eventho the ECU communicates with the Valves, they live their own life. The valves do not respond to the Drive Select modes.
Current behavior - valves are open at idle to 85%, close to 15% when I drive, and open again to 85% during hard acceleration.
Expected behavior - fully closed at Auto and Comfort and open in Dynamic.
Do you know if anything in the 09 or 19 unites have to be coded? (the car has an oem drive select and artificial exhaust imitation sound)

[[email protected]]

Drive select modes will not behave like having a CETE module installed. The factory valve behavior will do what it does, which is half open, all open, then mostly closed, etc, but yours sounds incorrect. You may want to look into modules that work with the MMI. I can't recall on those models if there is a separate engine and exhaust control for the MMI but if there is one would suspect that has some influence on it. If I recall to the transmission being in S mode effects valve behavior.

Otherwise you could likely now fit a CETE valve controller that is programmed to pickup in the engine drive select setting to control the valves. This might be the direction you want to go anyway because even if you sort out coding to get the valves to behave more factory like they will not always be open or closed and will do their random behaviors like a stock TTS. With the CETE valve controller you will get the behavior you are looking for.

It's likely CETE has a firmware that can be put on a TTS valve controller that will work with your current setup. Shoot over an email if interested and I can confirm with CETE: [email protected]

Cheers,