Titanium Grey S4 Avant

[hunker7]

Some of it is vapour, but that usually dissappear's quickly, but some of that smoke stays around for a while
.

I can't test it till I get back to London in a month time.

[hunker7]

Your silencer has fallen to bits inside

Why do you think so?

[newsh]

Because one side is blocked

[newsh]

Or is it separate all the way to the cats on a URS?

[hunker7]

I think looking at one of the Dave posts, in the silencers it is separate tubes but with holes in them, if it makes sense.

[newsh]

Actually you've been messing about with this LPG thing and the fuelling so it's very possible you've destroyed one or both cats.

[hunker7]

Well, ****

[macspring]

If you're not concerned about a bit of extra exhaust noise, I'd put in a set of cat by pass pipes for 50 weeks of the year.

http://www.ultimot.de/Komponente.php?id=MK001&TypWahl=1017

It may also cure your problem. If not, it will eliminate the cats as the potential culprit.

They allow the engine to breath / spin up a bit freer after say 4/5Krpm.

The pipes are not massively expensive.

[hunker7]

I rather put 244 euros towards a new system if I'm honest. I'll just gut cats, silencers for now, who needs them anyways.

[macspring]

If gutting, put a tube inside to keep the gases speeding along on their way towards the tailpipes, rather than have them 'rolling around' / slowing down in an empty box(es).

[hunker7]

Will do mate, thanks. what is the size on oem exhaust?

[macspring]

Not sure.

But a cheap plastic calliper gauge is a handy addition to anyone's tool box.


http://www.ebay.com/itm/New-6Inch-15...-/301822935593


Just pasting the link to this one purely for the photo and to give an idea of price.

"Real" ones can be bought cheap enough as well. Good to have both though.

[UrS4boy]

OE 3B, AAN, ABY and ADU Exhaust Components: a consolidation of info.

Or is it separate all the way to the cats on a URS?

Separate, from the "Y" in the down pipe, to the cats, through the center muffler and on to the final "box"





Stock AAN system on the ground:



Modified AAN system on the ground:



REFERENCE:

OE 3B, AAN, ABY and ADU Exhaust Components: a consolidation of info.:

http://forums.quattroworld.com/s4s6/msgs/196904.phtml

[hunker7]

Thanks chaps, I think I'll just get rid of silencers altogether and open up cats and gut them.

[hunker7]

So she still coughs up cloud of blue smoke when I start her up and give her some revs, and it smells of rich mixture and when she runs I get a miss fire occasionally and revs jumping. So I will take injectors out again and put them in jars for whole day and see if any are leaking