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Home > Puma (Tdci) > decat and centre box removal does it affect the turbo
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st86



Member Since: 16 Apr 2015
Location: Yorkshire
Posts: 11

England 2011 Defender 90 Puma 2.4 CSW Tamar Blue
decat and centre box removal does it affect the turbo
As per title does fitting a decat and centre box removal pipe make any difference to the turbo will it lag or not
Post #422406 10th May 2015 3:21pm
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Anderzander



Member Since: 08 Feb 2011
Location: Lancashire
Posts: 999

United Kingdom 
If anything it will spoil faster with the decrease in back pressure.
Post #422416 10th May 2015 4:18pm
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Anderzander



Member Since: 08 Feb 2011
Location: Lancashire
Posts: 999

United Kingdom 
Oops - auto correct got me and I can't edit on the mobile site --- spool faster - not spoil
Post #422417 10th May 2015 4:18pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Plenty of information already available, here's a starter......

http://www.defender2.net/forum/topic7482.html?highlight=spool If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #422425 10th May 2015 4:27pm
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Lorryman100



Member Since: 01 Oct 2010
Location: Here
Posts: 2686

There is not much of a difference from having the CAT removed to having one fitted, source a renowned tuner.

So much so I got a new CAT from Dan at Duckworth parts and it is going onto my Puma next week. The main reason is the acrid stink from the exhaust fumes that the CAT filters out. JMTW Thumbs Up
Post #422427 10th May 2015 4:32pm
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Likeomg



Member Since: 29 Jun 2012
Location: Lake District / Newcastle
Posts: 2637

2010 Defender 90 Puma 2.4 HT Stornoway Grey
i prefer not having one, it does make the turbo spool quicker and sounds meatier.
Post #422431 10th May 2015 4:49pm
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
^+1 but rearbox instead of centrebox. Differing opinions but glad I did it.

bell-auto-services wrote:
You may want to consider a Decat front exhaust, this will help the turbo spin up faster and free up the whole system. Regards Pete


Noticed the difference on mine straight away. Thumbs Up If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #422436 10th May 2015 5:15pm
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ian series 1



Member Since: 17 Nov 2014
Location: south
Posts: 3127

United Kingdom 2008 Defender 90 Puma 2.4 CSW Bonatti Grey
^^^^^^^what he said^^^^^^^ Thumbs Up 80" 80" 86" 88" 90"

Wanted, Forward Control Anything considered.
Post #422437 10th May 2015 5:20pm
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pannawonica



Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568

Australia 
I noticed two things once the cat and centre pipe were removed. First the engine had more power and spooled up much faster, secondly a huge reduction in heat in the cabin. On long trips +1000 mile no power drop due too heat. It seems too me that the exhaust heat can now flow away from the vehicle/engine which is all good! Very Happy Thumbs Up
Post #422532 11th May 2015 1:37am
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Naks



Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2632

South Africa 2010 Defender 90 Puma 2.4 SW Alpine White
I removed the cat on mine, noticed turbo spooling up much quicker.

Will also remove the centre silencer box, noticed lot of heat coming through on a recent trip in high ambient temps (34C) --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged



Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ
Post #422538 11th May 2015 5:22am
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Egghead



Member Since: 25 Nov 2012
Location: Surrey
Posts: 255

United Kingdom 2007 Defender 110 Puma 2.4 XS CSW Java Black
Heat killed my manifold and turbo Sad both were cracked! ££££ Evil or Very Mad Since removing cat and centre silencer the engine has been nice and smooth, it sounds rather nice, and my cab has been cooler too. Engine now remapped and EGR disabled. From a cold start the diesel smell is a bit stronger and the soot deposits around the exhaust exit are blacker these days but at least that Censored isn't going back into my engine anymore.
Post #422581 11th May 2015 9:23am
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Lorryman100



Member Since: 01 Oct 2010
Location: Here
Posts: 2686

I have tons of engine live data taken from my Puma with the decat fitted with an Alive stage 2 remap. I am planning to take more live data with the cat refitted. Once the mot is done in September I will base the two sets of live data on whether to keep the cat or refit the decat. Thumbs Up
Post #422733 11th May 2015 7:29pm
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st86



Member Since: 16 Apr 2015
Location: Yorkshire
Posts: 11

England 2011 Defender 90 Puma 2.4 CSW Tamar Blue
Hey guys thanks for all the responses definitely thinking ill do the decat now before i take it to bas for a remap do they still go through the emissions test for the mot without the cat and egr disabled?
Post #422739 11th May 2015 7:48pm
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munch90



Member Since: 26 Oct 2013
Location: guildford
Posts: 3558

England 
No emissions check for diesel as such , only smoke test for mot at the moment

only visible check for cat for mot , if you get a switched on tester without a cat is a fail
Post #422740 11th May 2015 7:52pm
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