Valve to dump ex. gas ?

[Greg_S]

I think the one in the RS6 acts as a restrictor in the main exhaust and opens up on full throttle to help keep the engine noise down.

Greg

[sorens2]

I will fit my own type before the cats.... :-)
Your MOT will probably shoot you.
I have a 2.5" downpipe, 2" through the cats and then 2.5" from cats and back.
So this valve should give me more power, less pressure in the system.
In is adjustable from 0.3 bars and up.
I will make a version in stainless steel due to corrosion if this type works. It´s still a test version. More to come when fitted.
The RS6 is a valve to reduce the noise of the large exhaust.
Thank´s for your inputs.

Søren S2

[Keeper of The Kitten]

Kind of like an automatic version of a "header dump" as seen on lots of old hot rods - they used to run a full system under the car but the headers (particularly the collector ends) were visible on each side of the car. The ends of each collector were covered by a plate and the street exhaust system T'd off the side of the collector. When they got to the drags the plate would be removed and offer a short unsilenced and unrestricted system. This is a more sophisticated way of doing the same thing, to the point where you can use it as you drive.

I reckon us decat guys could theoretically use something like this and divert the unrestricted system to the side - but for MoT tests you'd probably have to disable it somehow or remove the "open" system fit a connecting pipe in it's place?

Hmmm!

__MDC__

[Keeper of The Kitten]

Søren that's a good point about exhaust noise for RS6, of course the manufacturers have to pass all the noise regulations when making a new car and getting it type approved.

I'm not sure if there is even a defined noise level in the current UK MoT? I remember it used to be something like "not excessively noisy" ...which is a bit subjective!

__MDC__

[sorens2]

I have now fitted my own valve and it is stunning. It went up 0.2 bar on boost just by fitting this valve. It kicks in @ 0.5 bar and the power is now rock steady. Sound is absolutely unbeliveble. Sound is now really 5 cyl. and bike-like.
Everyone should have one...

Søren S2

[Doug_RS2]

So on-boost you have the exhaust exiting in the middle of the car?

Is that safe heatwise under the car?

Is this just a temproary thing? because it would be better if the on-boost path was straight through and not at 90 deg?

[sorens2]

Your right there. It could be a bit better, but this is 2.5" straight through (90 dgr.) and it is now a very low pressure system. It is only the downpipe and then this valve. Heat is no problem at all. And it is staying on, absolutely.
If U wan´t a video I can mail it to U.
kontakt@hurtigebiler.dk

Søren S2

[S2central.net]

Your right there. It could be a bit better, but this is 2.5" straight through (90 dgr.) and it is now a very low pressure system. It is only the downpipe and then this valve. Heat is no problem at all. And it is staying on, absolutely.
If U wan´t a video I can mail it to U.
kontakt@hurtigebiler.dk

Søren S2

Soren - can you please Email the video with audio to me -

S2central@mac.com

Thanks,

Paul

[Doug_RS2]

yep - and me - how loud is it - as you are effectively running no silencers on boost!

bennett@nildram.co.uk

[S2central.net]

Oh I've heard the effect and its DAMN impressive. Sounds very nice to my ears... Let me see if I can host it for all to see

Soern - I've sent you an Email with some suggestions for quantifying any gains from this cheap and cheerful exhaust modification. It is very ingenius. I'll be thinking about this one some more.

Anybody know what the UK MOT ruling on such a device would be ?


Paul

[Billman]

Where is the VIDEO??? I dont have it yet!

@SoernS2
i have sent you a mail yesterday night! Please send me the video too!

Greetings

[S2central.net]

You don't need video - just this clip

http://s2central.net/soern_pipe.html

Demux'd from Soern's 6MByte MPEG-1 program stream into AIFF audio, then converted to MP4 streaming Audio with Quicktime. All in a matter of seconds. I love my Mac !

Plays with any FREE quicktime player from http://www.apple.com/quicktime

Enjoy !

Paul

[jeroen]

i really like the idea! wich some extra refining it could be superb(thinking about the angle-maybe slitely longer pipe to get less dirt ant water wich can make it detiriorate quicker!)but i cant get the film to work!

[Billman]

It is not a film! It is only sound!

[S2central.net]

It is not a film! It is only sound!

Sound is ALL you need... The video is just of car passing by on road. Not so interesting - trust me !


Paul