decatted td4 yesterday

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I've done my td5! I bought a terrafirma replacement pipe, I found the turbo seemed to spin up maybe 200 rpm earlier and it freed up the top end, as for power? No idea, but it seemed a bit more willing:)


DD
 
singvogel,
i took the middle section off the vehicle, then with a 1mm cutting disc cut a 8x6 inch rectangle out of the top of the cat/filter. i then chiseled out the insides replaced the piece ofmetal that i cut out and then welded it back up. so it looks exactly the same. You cannot see any difference looking from underneath.
 
With the cat off and a long bar, you can knock the insides out with out the need to cut into it, did it 2 years ago been through 2 test no prob.
Had to do it as had a turbo let go and the oil blocked the cat up.
 
I had a new bit of pipe made up for my L series for about £40. There was a spate of Pikey related cat thefts in the area and I thought I'd rather this than have them cut the section out and me having to replace the lot...

Seemed to rev cleaner but I dunno for sure..
 
spacemonkey
diesel cats are worthless, they are a filter and there is no precious metals inside.
people call then cats but actually they are particle filters, its like a ceramic type material inside.
 
Chris D said:
My mate is a mot tester,and he said its a fail with a decat for Diesel,he said he wouldn't even pass mine,i had to put the cat back on.
Click to expand...

Sorry pal, but that is complete and utter bolloc*s.

I wouldn't go near any MOT garage that said that - as they have obviously not read the latest/current VOSA Tester's Inspection Manual or the VOSA regular bulletins and updates.

VOSA had so many folks 'phone them about this that they actually issued a memo clarifying the situation.

Only petrol engined vehicles are subjected to a full cat and emmisions test and will fail if there was one fitted at the factory and it is missing.

Diesels only get a smoke test - the so-called 'cat' on a diesel is actually a particulate filter and is a different beast alltogether.

Get the VOSA downloads and read the truth.

Singvogel.
 
Last edited:
That why you are better to remove the inner by what ever way you fine easier and replace, it then looks like it should do and will not get a second glance for mot
 
Singvogel said:
Sorry pal, but that is complete and utter bolloc*s.

I wouldn't go near any MOT garage that said that - as they have obviously not read the latest/current VOSA Tester's Inspection Manual or the VOSA regular bulletins and updates.

VOSA had so many folks 'phone them about this that they actually issued a memo clarifying the situation.

Only petrol engined vehicles are subjected to a full cat and emmisions test and will fail if there was one fitted at the factory and it is missing.

Diesels only get a smoke test - the so-called 'cat' on a diesel is actually a particulate filter and is a different beast alltogether.

Get the VOSA downloads and read the truth.

Singvogel.
Click to expand...
Thanks for this Singvogal,Ill have a look at Vosa,he's a bit of a knob anyway :)
 
Chris D said:
My mate is a mot tester,and he said its a fail with a decat for Diesel,he said he wouldn't even pass mine,i had to put the cat back on.
Click to expand...

He obviously isn't any good at his job!!! I would find a decent mot station! One were they read updates and actually bother to get it right! It's why I pay a little bit more but I know it's done properly


DD
 
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