Thread: The "cat"[ td5 exhaust.]

No cat in td5 exhaust system...

Sorry Bob,, catalytic converter's are a V8-ULP thing,, put in to clean up the exhaust fumes,,
all they do is slow down gas flow I reckon,,,

Some TD5 had cats

My unofficial recommendation:

Get rid of it

Originally Posted by Tombie

Some TD5 had cats

My unofficial recommendation:

Get rid of it

True some Td5,s did have cats but you will be hard pressed to find a exhaust place that will remove it for legal reasons and the fine they could get .

Best to go to the wreckers and get a second hand engine pipe minus the cat or remove your engine pipe and have a exhaust place fab a new pipe minus the cat and then fit it your self While your at it remove the centre muffler

The Cat is the catalytic converter top points for that. What it does for you is converts nasty gasses from the engine into not nasty gassed for the environment. it also produces water as a part of the deal. (which is the white smoke you can see coming out of some cars on a cold enough morning.

Some TD5's had them some had a diesel particulate filter, both to the untrained eye look about the same. the big question is do you need them? Yes, you do, they were factory fitted and so must remain fitted, just like the EGR just like a couple of other things that are done for emission reasons. Can you get away without them? Yes, without the cat or the diesel particualte filter up to about 2004/05 (and only because I havent tested against the new standard) the td5 passes the Australian emission standards for Diesel engine without any of the goodies that are down stream of the turbo.

do they make a difference in performance? well that depends. If you only change or remove the cat or the DPF then you wont get an increase in performance. IF however your cat/DPF was clogged and you remove it then yes you would notice an increase in performance but it would only be up to the vehicles original performance standards.

If however you had added something akin to one of Tombies Proton energy pills then yes removing the DPF/CAT makes a difference, swapping out the exhaust in total for a 3 inch mandrel bent unit makes even more difference.

But, I hear your hippy greenpeace advocates voice saying, Can you have the best of both worlds full TPEP performance with a butteryfly farting exhaust? again Yes, But it costs and In my opinion the cost is worth it just to avoid the hassle of having to prove that yes the 2003 td5, commodore lunching, traffic light drag launch Defender is in fact totally legal without the gear in the exhaust system.

Lets face it design it and use it right, the exhaust system (with the exception of the gaskets and mounts that you trash taking it apart to get to bits of the vehicle) should last you 10 years.

Yet another day where I learn something new. TD5 EU2 - no cat, EU3 - cat... Funnily enough my car had EU3 spec EGR gubbins and yet EU2 for the exhaust. 2002 model so I guess was at the changeover... and no CDL

Blknight, thank you for the explanation. Since joining this forum, I have learned so much from members , I have had to take up drinking Tasmanian beer [ cascade] in order to grow a second head to keep it all in. Bob

Originally Posted by bob10

Blknight, thank you for the explanation. Since joining this forum, I have learned so much from members , I have had to take up drinking Tasmanian beer [ cascade] in order to grow a second head to keep it all in. Bob

Better a second head, than losing taste buds drinking that QLD rubbish

Baz.