Pre FL Exhaust Valve unplugging

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S3orge

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I Know this has been asked & talked about several times so forgive me but I still don't fully have an understanding of the best way of doing this.

Am i correct in thinking if I want to unplug the exhaust valves on a Sport exhaust while they are open I can do the following. Let the car idle in dynamic ( which I believe has both valves open?) then turn the car off. The valves will then stay open until the engine is restarted? Or do I actually have to have the car running at the time while I'm unplugging the valves?

Any help would be appreciated

Thanks
 
Afaik that isn't a great idea as if the valves are always open the cars pulls power at certain revs. Better to have Cete valve control system imho as it opens and closes the valves to protect the engine e.g. always shut in comfort but open above 5k revs still etc.

TX.

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I have always had the car running while I unplug them. Only a 30 second job each side and the exhaust doesn't get hot that far back.
 
terminator x said:
Afaik that isn't a great idea as if the valves are always open the cars pulls power at certain revs. Better to have Cete valve control system imho as it opens and closes the valves to protect the engine e.g. always shut in comfort but open above 5k revs still etc.

TX.

Sent from my BBB100-2 using Tapatalk
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If the valves stay closed throughout the rev range that could in theory cause damage. Can't see how having open valves all the time can cause damage. The CETE controller has an option to leave the valves open all the time unless I am mistaken?
 
Drewsus said:
If the valves stay closed throughout the rev range that could in theory cause damage. Can't see how having open valves all the time can cause damage. The CETE controller has an option to leave the valves open all the time unless I am mistaken?
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There is no problem with coding the valves to stay open, the problem is unplugging them which will cause the ECU to pull power.
 
Lehn said:
There is no problem with coding the valves to stay open, the problem is unplugging them which will cause the ECU to pull power.
Click to expand...

There are plugs with resistors in on the market for circa £30 which is what I use.
 
Drewsus said:
There are plugs with resistors in on the market for circa £30 which is what I use.
Click to expand...

That makes sense. OP is asking if he can just unplug the valves and to that my answer will be no. However, if OP is considering buying the plugs you're talking about I would personally just spent a little more money and buy OBDeleven pro and code the valves out and maybe make som other changes.
 
Lehn said:
That makes sense. OP is asking if he can just unplug the valves and to that my answer will be no. However, if OP is considering buying the plugs you're talking about I would personally just spent a little more money and buy OBDeleven pro and code the valves out and maybe make som other changes.
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That is good to know as I didn't know they could be coded out via OBDeleven.
 
Lehn said:
That makes sense. OP is asking if he can just unplug the valves and to that my answer will be no. However, if OP is considering buying the plugs you're talking about I would personally just spent a little more money and buy OBDeleven pro and code the valves out and maybe make som other changes.
Click to expand...

You cannot code the valves open on the RS3 I’m afraid.
 
S3orge said:
I Know this has been asked & talked about several times so forgive me but I still don't fully have an understanding of the best way of doing this.

Am i correct in thinking if I want to unplug the exhaust valves on a Sport exhaust while they are open I can do the following. Let the car idle in dynamic ( which I believe has both valves open?) then turn the car off. The valves will then stay open until the engine is restarted? Or do I actually have to have the car running at the time while I'm unplugging the valves?

Any help would be appreciated

Thanks
Click to expand...


I have new blacking plugs for the PFL, bought by mistake

https://ebay.us/mxSicb

I will take £20 for them with free post in the UK only.

Message me if you are interested.
 
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I’ve got a set of the Delete plugs for the FL sat in the garage.

As already said countless times if you pull the plugs while the can bus is live it’ll throw an error code, then what will happen is the ECU pulls power higher up the Rev range.

A friend of mine tested this theory on a rolling day and the operator of the RR pointed it out to him.
He plugged the valves back in and normal service was resumed.

You need to buy a Cete controller or similar, or at the very least the proper delete plugs and fit them without generating a fault code (unless you can clear the code yourself)
 
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Cheers for the input everyone. Seems like blanking plugs are the best way forward then, and do these definitely not store codes or cause ECU to pull power?

Kind of going back to the original question and reading through the thread that Lehn attached T-800 mentioned that unplugging while the car is running would store a code and still pull power at 5k rpm? So i'm best to do the unplugging once the car has shutdown i.e 1st thing in the morning or similar?
 
S3orge said:
Cheers for the input everyone. Seems like blanking plugs are the best way forward then, and do these definitely not store codes or cause ECU to pull power?

Kind of going back to the original question and reading through the thread that Lehn attached T-800 mentioned that unplugging while the car is running would store a code and still pull power at 5k rpm? So i'm best to do the unplugging once the car has shutdown i.e 1st thing in the morning or similar?
Click to expand...

I can't say for sure mine pulled power as I have no proof it didn't. However, I installed mine with the engine running and scanned for codes once installed and there was no stored codes.
 
Are the codes only visible to clear through VCDS ? I have a couple of Apps on my phone (OBD Fusion & Dash Command) which have been pretty decent on previous cars in terms of picking up & clearing codes but what I don't want is these codes sitting in the background and pulling power.
 
audi upgrades
Just a quick update for people who may be interested. I purchased the exhaust valve blanking kit from JM722 above and fitted these as I jut found the car needed that 5 pot bark opening up lower down in the rev range. I've also since been to MRC and had a stage 1 map, gearbox tune & BMC filter installed. Given that some previous cars have been dyno'd and the 'pulling of power' has been picked up I was curious to see if this would be the case. It turns out mine wasn't pulling power.

Interesting to see that its not as clear cut as if you unplug the valves you get a fault code/loss of power. I'm guessing it may come down to how & when they are installed, I did make sure that the car was completely shutdown before I did any unplugging on the valves.

On another note the car made some good numbers at MRC, 420PS & 654NM which has made a huge difference. The torque numbers are very impressive.
 
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