Where to put the cat ?
Thread Starter
AudiWorld Senior Member
Joined: Dec 2001
Posts: 821
Likes: 3
From: Warsaw, Poland
Where to put the cat ?
I'm gonna do the custom exhaust on my car soon.
I heard somewhere that the way the OE cat is mounted on 1.8T engines is worst imaginable - straight to the turbo.
Do you thing that moving the cat 1m down the pipe would be beneficial ? I could replace the OE cat with random-tech high flow 2,5" cat for example. I can even do a 3" downpipe between the turbo and the cat.
Any ideas ?
I heard somewhere that the way the OE cat is mounted on 1.8T engines is worst imaginable - straight to the turbo.
Do you thing that moving the cat 1m down the pipe would be beneficial ? I could replace the OE cat with random-tech high flow 2,5" cat for example. I can even do a 3" downpipe between the turbo and the cat.
Any ideas ?
AudiWorld Super User
Joined: Mar 2000
Posts: 13,037
Likes: 0
Sure you can move it, and you don't need a metallic cat, ceramic will suffice...
what you could do is have a ceramic 3" in/out Catco cat put somewhere downstream, like replacing the resonator, or welded into a mid-pipe. Id just leave the O2's in the test pipe and use an emulator to eliminate the CEL.
That is what i plan to do in the near future. Since the temps are lower, a $200 catco is all you need. Look at what the GTI folks are doing.
Cheers,
Sameer
That is what i plan to do in the near future. Since the temps are lower, a $200 catco is all you need. Look at what the GTI folks are doing.
Cheers,
Sameer
AudiWorld Super User
Joined: Mar 2000
Posts: 13,037
Likes: 0
look at the OEM cat, its not a straight in, straight out...
its curved significantly on the outlet side. So to use it, id assume you cannot just weld it into a mid-pipe. A 3" in/out catco is just straight in and straight out.
Besides, you do not want the narrow restrictions if you are going for power. To have a 3" DP is great, but then why have a 2" inlet, 2.25" outlet OEM cat as a bottleneck in the middle of your system?
Cheers,
Sameer
Besides, you do not want the narrow restrictions if you are going for power. To have a 3" DP is great, but then why have a 2" inlet, 2.25" outlet OEM cat as a bottleneck in the middle of your system?
Cheers,
Sameer
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