How can you tell if you've been de-catted?

jmachling · Post by **jmachling** » Sun Nov 05, 2006 1:22 pm

I had previously thought that my Rev 3 tubby had been de-catted as there are some great woofs, pops and bangs from the exhaust pipe (Departure II).

However, after having had it MOT'd for the first time, it was tested as if it had a catalyst and passed quite easily (Fast idle CO was 0.17%, natural idle was 0.31%) which leads me to believe the cat is still in situ and there's some more power to be gained with a downpipe or decat.

Any easy way to tell without struggling with rusted studs and skinned knuckles?

TIA.

John.

karammander · Post by **karammander** » Sun Nov 05, 2006 1:49 pm

the easiest method if your obviously cant see a stainless downpipe is to remove the exhuast front pipe away from the cat, at the sump end, look up it and if its got a cat, should see a honeycombe like blockage.

cheers karam

jmachling · Post by **jmachling** » Sun Nov 05, 2006 2:05 pm

There's definitely no downpipe - I was just curious to know if there are any easy ways to spot a decat without getting the spanners out.

Baker · Post by **Baker** » Sun Nov 05, 2006 9:17 pm

possibly removing the lambda? just a thought.

cantfindausername · Post by **cantfindausername** » Sun Nov 05, 2006 9:20 pm

Yup... remove the lambda sensor and stick something long in there. If there is an obstruction, you have a cat in there, if not, then its either been removed, or has fallen as mine did. The guy that showed me this trick used an arc welding rod, but anything long should do the trick. A fair sized screwdriver for instance.

jmachling · Post by **jmachling** » Sun Nov 05, 2006 9:29 pm

Fab - thanks guys! Don't know why I didn't think of that - it's one of those 'blindingly obvious when someone tells you' things. I'll give it a go.

cantfindausername · Post by **cantfindausername** » Sun Nov 05, 2006 9:42 pm

simplest solutions are often the hardest to find

Baker · Post by **Baker** » Sun Nov 05, 2006 9:58 pm

next question is...can you gut the cat through this same hole??

cantfindausername · Post by **cantfindausername** » Sun Nov 05, 2006 10:00 pm

with a mighty powerful sucking device, and a lot of f'ing and blinding... I don't see why not.

Baker · Post by **Baker** » Sun Nov 05, 2006 10:45 pm

cantfindausername wrote:with a mighty powerful sucking device, and a lot of f'ing and blinding... I don't see why not.

if i had a powerful sucking device i wouldnt use it on my car

cantfindausername · Post by **cantfindausername** » Sun Nov 05, 2006 10:47 pm

don't think you're the only one lol

arman · Post by **arman** » Tue Nov 07, 2006 9:54 am

i had lower readings than that and i ve got a td06 on mine

www.imoc.co.uk

How can you tell if you've been de-catted?

How can you tell if you've been de-catted?

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