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lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3531

CAT removal

Yesterday l fitted a decat pipe to my TD5 Defender

I read that this was a worthwhile modification but tbh can’t feel any difference when driving it today. The rest of the exhaust is standard and it’s running a mild remap.
Also it’s had an EGR valve delete kit a while ago.

What’s supposed to be the advantage in removing the CAT? Apart from weight saving!

4th Oct 2018 3:19pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2239

Faster turbo spool. Ideally need a less restrictive midbox too

4th Oct 2018 4:11pm

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1791

Mine's never had a cat, so can't directly compare, but I did notice a difference in how fast the turbo spooled when I swapped my mid box for straight pipe.

4th Oct 2018 7:15pm

Procta

Member Since: 03 Dec 2016
Location: Sunderland
Posts: 5376

This is going off my 306 HDI which did have a CAT, I removed the thing for the mot, I found the turbo spools a lot quicker and a little more grunt. I later fitted a stainless steal Exhaust which opened the power up too. As bankz5152 says.
I cannot see the point of a CAT on a diesel, for what use it does. I removed it off the 300 TDI and binned the EGR system too.
Also I did block off the EGR on the Peugeot too, which saved the engines inlet.

It might be worth having the Map tweaked a little bit more, since you have binned CAT off. Defender TD5 90 ---/--- Peugeot 306 HDI hatch back

In the words of my Good Friend, Gary Forrest 1980 -2025
" we will work something out"

4th Oct 2018 8:23pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3531

I must say the turbo lag does seem reduced, for instance when changing gear there’s no delay in pickup like there was before.
The CAT was a Britpart one and l’m not sure it was working anyway.

4th Oct 2018 8:24pm

Procta

Member Since: 03 Dec 2016
Location: Sunderland
Posts: 5376

Check the exhaust and intercooler pipes for any leaks too, just in case. With the system been more free to flow, it lets the turbo spool quicker. I found the HDIs turbo was louder when it spools.
Also it will go through an mot too, as the cat does square root of

all on a diesel. Defender TD5 90 ---/--- Peugeot 306 HDI hatch back

In the words of my Good Friend, Gary Forrest 1980 -2025
" we will work something out"

4th Oct 2018 8:33pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3531

Further update.
Engine revs better and makes more speed on hills than it did before. Not a lot, but definitely better.
Also can change up at around 2,200rpm going up hill where before l had to change at 2,500rpm because there was a short delay for the turbo boost to come back.

5th Oct 2018 3:51pm

Procta

Member Since: 03 Dec 2016
Location: Sunderland
Posts: 5376

Yeah it will help with the pulling power as the system isn't as restricted. Defender TD5 90 ---/--- Peugeot 306 HDI hatch back

In the words of my Good Friend, Gary Forrest 1980 -2025
" we will work something out"

8th Oct 2018 8:17pm

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