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lightning



Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2159

United Kingdom 
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!
Post #732943 4th Oct 2018 3:19pm
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bankz5152



Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2049

2004 Defender 110 Td5 DCPU Epsom Green
Faster turbo spool. Ideally need a less restrictive midbox too Instagram @defender_ventures
Empire Tuning - Agent
Post #732954 4th Oct 2018 4:11pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
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.
Post #732975 4th Oct 2018 7:15pm
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Procta



Member Since: 03 Dec 2016
Location: Sunderland
Posts: 4908

United Kingdom 
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. Thumbs Up
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

Success is 90% Inspiration and 4 minutes Preparation # you can make it!
Post #732990 4th Oct 2018 8:23pm
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lightning



Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2159

United Kingdom 
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.
Post #732991 4th Oct 2018 8:24pm
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Procta



Member Since: 03 Dec 2016
Location: Sunderland
Posts: 4908

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

Success is 90% Inspiration and 4 minutes Preparation # you can make it!
Post #732993 4th Oct 2018 8:33pm
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lightning



Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 2159

United Kingdom 
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.
Post #733123 5th Oct 2018 3:51pm
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Procta



Member Since: 03 Dec 2016
Location: Sunderland
Posts: 4908

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

Success is 90% Inspiration and 4 minutes Preparation # you can make it!
Post #733712 8th Oct 2018 8:17pm
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