Wastgate Exhaust

[s2avant]

You've shown us the way Master Cockings , we can only hope to follow in your footsteps (or is that boot prints? )

Ben

[Sweeper]

Ben: Call me jacko but I don't understand what all that catch tank means , anyway even if i would understand there are no way for me to understand how to make one

Is there anywhere a complete guide how to make one ?

Thanks,
Vadim

P.S. "And I'm not sure I understand the concept of actually buying bits for my car. You mean I'm supposed to pay for things". Nice one, time to get my CV to a local Audi dealership

[audiman]

Vadim, a catch tank is a device for catching(collecting) oil breather fumes. They condense and the oil returns back to the sump.

[S2central.net]

There is only about 5 inches of SS 10mm pipe sticking out the exhaust - I angled it so the hose would go round the brake fluid reservoir in case it all got hot but the end where the hose connects doesn't get hot - you can hold it after a thrash.

Doug - you've beaten me to it on this one - I was gonna get Marco to put such a 'vacusump' fitting on my 70mm downpipe and have it made with a separate wastegate pipe in mind, but running with CATs I'm not sure its too clever as they won't like any oil vapour getting blown thru them. Big question is how much oil vapour makes it to that side - the separator tank should retrieve the vast majority of it.

Regardless of that - let us know what vacuum readings you get on that exhaust pipe fitting. I may yet get Marco to do things that way and I can just blank it off until I get a catch/separator tank that I'm happy with.

Paul

[Doug_RS2]

I don't run cats Paul - I'll disconnect the vaccum line to the catch tank for the one day I do run them though.

[porkkis]

I'd say that such breather routing messes up the lambda value. If there even will be any vacuum. You're planning to use somekind of a check valve, right?

[Doug_RS2]

Why would it mess up the lambda reading?

Check valve for what?

[porkkis]

Doh. I didn't recall that the lambda is before the wg pipe enters the dp.

Check valve for avoiding over pressure in the breather caused by exhaust pressure?

[Doug_RS2]

Check valve for avoiding over pressure in the breather caused by exhaust pressure?

I need to measure it first to see what sort of pressures are generated. It might need something to stop it over pressurising.

[WabTheKing]

ya no that breather hose with goes in to maf-turbo hose, what would happen if i capped it off?

[S2central.net]

It would gradually fill up that hose (from the breather system) with oil and moisture. Much worse than that - you would effectively be preventing crankcase fumes to be ventilated and you'd end up in all sorts of schtook with positive pressure in the crankcase - yikes !

[WabTheKing]

Oh er right, not a good idea then, so if i put an oil catch tank between that solid pipe and the maf-turbo hose, with filter on the turbo side would this prevent as much ***** going through the turbo as would do normally but still allow the crank case to breathe?

[S2central.net]

DO a search on PCV systems in this forum - I drew some diagrams on how to do this a while back. I need to get it into S2 Central though... just not enough days in the week.


Paul