Cat delete.

[V8Ian]

What size pipe do I need for a Td5 cat delete?

[sierrafery]

Measure the downpipe under the turbo with a caliper, simple as that

[shack]

You can also just buy a delete pipe, which replaces the original pipe back to the muffler.

[Tins]

They say this (https://www.allfourx4.com.au/Terrafirma-De-cat-Exhaust-Pipe-suitable-for-Defender-Discovery-Td5-TF562/) is for off road use only...... CTA.

[V8Ian]

They say this (https://www.allfourx4.com.au/Terrafirma-De-cat-Exhaust-Pipe-suitable-for-Defender-Discovery-Td5-TF562/) is for off road use only...... CTA.
A bit rich for me, I reckon I can do the job at home for under $100.

No O² sensors?

[shack]

A bit rich for me, I reckon I can do the job at home for under $100.

No O² sensors?No sensors of any kind, you can just cut the cat out, post it over to me for free, and fit a straight bit of pipe.

[V8Ian]

No sensors of any kind, you can just cut the cat out, post it over to me for free, and fit a straight bit of pipe.
Have a guess why I want to do it at home. [biggrin]

[shack]

Have a guess why I want to do it at home. [biggrin]No idea! That one has slipped passed me.

[Tins]

Is there really enough good stuff in a D2 cat to cover the postage across the country, James?

[Slunnie]

You could probably just buy a pre-update down pipe pretty cheaply from someone dismantling a Disco2. They never had cats in them.

Potentially the benefit of buying one of those fandangled ones however, is that I understood the factory flex is a choke, and it might address that if its an issue. I've never looked inside mine.

[V8Ian]

Seemingly the fitment, or otherwise, was a bitt hit and miss, Simon.
I'll check the markets for someone dismantling a D2, thanks for the idea.

[shack]

Is there really enough good stuff in a D2 cat to cover the postage across the country, James?Probably not, but I thought it was worth a laugh!

[shack]

I bought a new flex joint for my 99 after reading that it was a restriction on the early ones.

After pulling the pipe and measuring, I found it was the same size as the rest of the exhaust.

But that's only on a sample size of 1.

[Slunnie]

I bought a new flex joint for my 99 after reading that it was a restriction on the early ones.

After pulling the pipe and measuring, I found it was the same size as the rest of the exhaust.

But that's only on a sample size of 1.

I hope thats the case with all of them!

[Tins]

You could probably just buy a pre-update down pipe pretty cheaply from someone dismantling a Disco2. They never had cats in them.

Potentially the benefit of buying one of those fandangled ones however, is that I understood the factory flex is a choke, and it might address that if its an issue. I've never looked inside mine.

Factory flex was an issue on my 2000. Choke, and failed RWC. Later pipe ( well, one I got from a wreck ) had a different type of flex joint, not the mesh type, more a concertina. Not sure if it presents any issues.

[V8Ian]

The concertina type is widely used on trucks without issue.

[Tins]

The concertina type is widely used on trucks without issue.

Yes. It doesn’t need to flex much. I have no idea what the source of mine was originally. But it did have a cat. My original one didn’t.

[discorevy]

The O.D. of the pipe is 63mm or close enough to 2.5 inches

The early braid EU2 type had no internal restriction but could flog out.

The later EU3 had the concertina type flex but internally, was restricted down to around 45mm, this helped with velocity, which aided the cat to a degree, as well as losing the distinctive EU2 turbo whistle, but isn't great when getting the engine to breathe.

The flex can be positioned further down if doing the pipe through an exhaust shop or DIY if you want easier access to the spin on filter.

[rick130]

You could probably just buy a pre-update down pipe pretty cheaply from someone dismantling a Disco2. They never had cats in them.

Potentially the benefit of buying one of those fandangled ones however, is that I understood the factory flex is a choke, and it might address that if its an issue. I've never looked inside mine.


[edit] late to the party again, Craig has already answered it [biggrin]
The bellows type flex is quite undersized internally.
Whether it really affects performance though?

[Tins]

[edit] late to the party again, Craig has already answered it [biggrin]
The bellows type flex is quite undersized internally.
Whether it really affects performance though?

On a stock TD5 I doubt it. I swapped my mesh (?) type one. without a cat for a bellows one with a cat. Can't notice any difference, apart from it not leaking.

[V8Ian]

The cat's definitely going.


https://youtu.be/AFZG1R6Y4vw'si=xboegTPfwaYnF8vU

Is that the same mob who write the tunes? I'm not impressed with their parts cannon aproach to mechanicing.

[discorevy]

The cat's definitely going.

Is that the same mob who write the tunes? I'm not impressed with their parts cannon aproach to mechanicing.

Yep, I'd hope they don't convince the owner to cough up for a set of injectors without other tests first.

He mentioned at the start, a very noisy fuel pump... that'd be a clue to test the fuel pressure, if OK, then map sensor, cam timing, injector bump clearances... then they could move on to help the cameraman medicate his Tourette's.