please enlighten me on my cat stuff (see pics)

[*ZenithalRavage*]

Hello S2 friends!

My cat rattles at about 1700RPM so today I had it removed for inspection. It looks like it has been taken off before because I see lots of welding marks and it seems they didn't do a pretty job as the connection on the right is not straight. We think that the rattles are made by the metal rings in the connection as these looked a bit screwed up (marks and uneven wear) probably because the previous handlers did a bum job putting it back together. Tomorrow I will know for sure as we will straighten the connection and put in new rings.

Can anybody tell me if the cat we took out is the first or second, and where the heck is the other cat, has it allready been removed? The S2 has two cats doesn't it? (or just the ABY? I have 3B).
Also, any Idea why one would go through so much trouble to get that cat back in there? Regulations? Results weren't what they hoped for?

Any info greatly appreciated, and if anyone else has pictures of their car's belly it would be very nice to see them here

Greetz

Here are the pictures, not all fit in one post so I spreaded them, hope you admins don't mind.....:

[*ZenithalRavage*]

[Jeffer]

Hey,

That does not look like it should be. The pipe after the down pipe is originally a split pipe that goes to the TWO cats. You only got one!!

As you can see from the welding points, is that they removed the second pipe on the splitter. and welded it shut again, so that one cat will be remained. So that's NOT OK!

I'll make some pictures of my 3b cat system, so that you can see it.

BTW waar woon je?

groet

[Jeffer]

ANd there are missing some heat shields!

[Jeffer]

Oh, and concerning the rattle.
Did you check your lamda-sonde in the downpipe from the turbo. If it's loose then it rattles around those rpm's.

greets

[*ZenithalRavage*]

Originally posted by Jeffer
Hey,

That does not look like it should be. The pipe after the down pipe is originally a split pipe that goes to the TWO cats. You only got one!!

As you can see from the welding points, is that they removed the second pipe on the splitter. and welded it shut again, so that one cat will be remained. So that's NOT OK!

BTW waar woon je?

groet

Hmmmm... interesting stuff
So indeed I'm allready running on only one cat? Hmm.. This morning I let the dealer check to see if the ECU gave any errors, it gave none. While they were at it they also did a "viergassentest" and CO2 check and said all was ok, so surely I won't have any trouble getting through the APK (UK: MOT?), but as this is my only cat I won't replace it with straight pipe then which was my initial intension.

[Dutch mode]ik woon in Hoogerheide, jij?[/Dutch mode]

I'll make some pictures of my 3b cat system, so that you can see it.

That would be VERY much appreciated !!

[*ZenithalRavage*]

Originally posted by Jeffer
ANd there are missing some heat shields!

indeed, hm.... is that serious do you think?

[*ZenithalRavage*]

Originally posted by Jeffer
Oh, and concerning the rattle.
Did you check your lamda-sonde in the downpipe from the turbo. If it's loose then it rattles around those rpm's.

hmm.. didn't really check it, but I did have a mechanic under my car while I was revving to see where the rattle came from, and apparently it did come from the cat. Let's just hope it's the rings though and not something IN the cat because I got a quote for a new one and it was € 910, no freakn' way I would pay that kinda money just to get rid of a rattle

[Jeffer]

well, Lamda-sonde can be seen from under the hood, and is 20 cm located after the turbo on the downpipe. Check if that's tightend.

I live near Amsterdam, to be exact Cruquius

And i'll score some pictures tomorrow from the cat. No problemo!

And contact me if your going to make or order the cat replacements. I need those to. I've been looking for those flanges. I found something like it, so i can weld them myself

Greet,
Jeffer

[Pisobiker]

Hi "Zen",

your "one-cat-converter" layout will probably build up a lot more back pressure than original 2 cats so that replacing the missing one (or, better, replacing it with a racing tipe unit) will improve your midrange-to-high rpm power.
Following are pictures of my actual layout:

New custom built 3" s.s. turbo back compared to original middle system (ABY)
yours (3B) should be slighly different in the "splitting".

[Pisobiker]

...detail on turbo+WG flanges + lambda sonde

[Pisobiker]

... and racing 200 cells per square inc cat-converter (installed afterwards to meet noise and pollution limits and also to optimize low rpm performances).

Marco

[Sweeper]

I still have one RACE CAT for sale

[Jeffer]

I tried to take pictures whilst the car was on the ground :confused:
But you get the idea!!! A 3b cat splitter

[Jeffer]

and another one