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blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16876

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

To close this thread, I thought the following notes might be of some interest.

1) My thanks to the team at Alive, for stunningly good service! I am not sure who I spoke to (Gary, Alex, or someone else) but they were extremely helpful, and I ordered a front pipe mid-morning on Wednesday, it arrived mid-morning on Thursday, and was fitted by mid-morning on Friday. Many thanks, guys, if you read this!

2) Replacing the broken cat pipe with a de-cat pipe has made two significant differences. Firstly the noise is quite different. There wasn't much 'leaky exhaust' noise from the engine with the cracked pipe, but there were general 'bag-of-nails' sounds and 'turbo-on-its-last-legs' rattles and whistles which were disturbing. They have now gone, and the engine generally is sweeter-sounding and seems smoother than ever. Secondly the performance from 2500 rpm upwards is transformed - whereas before the engine sounded as though it was objecting to revving to 3000 rpm, and I seldom did so, now it is smooth, sweet, and quiet to 3500 rpm (and possibly higher, but that's not how I drive it). The power is noticeably improved at these engine speeds too, with more power and a smoother delivery.

(Editted for spelling)

Last edited by blackwolf on 1st Apr 2015 10:34am. Edited 1 time in total

1st Apr 2015 9:32am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19572

I have my eye on the Alive exhusts too.

Gary got me out of a hole quick with some EGR problems I had last year too.

1st Apr 2015 9:45am

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

2013 Defender 110 Puma 2.2 XS DCPU Keswick Green

blackwolf wrote:
Replacing the broken cat pipe with a de-cat pipe has made two significant differences.

Would you of got any of the benefits of the de-cat pipe by just replacing a broken cat pipe with a new one though?

1st Apr 2015 10:35am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16876

I can well imagine that the noise improvement would be the same, but it is hard to see how the performance increase would have resulted from a cat fitment. it is possible (back pressure and all that) but I doubt it. The performance difference is not earth-shattering but is noticeable.

Ultimately we won't find out until I take the decat off to refit a cat pipe when I find one at a sensible price.

1st Apr 2015 10:39am

fatman

Member Since: 14 Jan 2014
Location: Athens-Greece
Posts: 126

2007 Defender 110 Puma 2.4 USW Keswick Green

On my mates stock puma, decat and air intake mod definatly made a difference not a placebo one for sure!

1st Apr 2015 3:16pm

K9F

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

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

K9F wrote:
It was in my view the cheapest performance enhancement and engine protection modification you could do next to EGR blanking.

You have removed the 'stranglehold' the cat had on the breatheability of your engine. Still stand by that statement above! 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!!

1st Apr 2015 5:25pm

ian series 1

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

2008 Defender 90 Puma 2.4 CSW Bonatti Grey

+1 for cat removal, completley transformed mine

80" 80" 86" 88" 90"

Wanted, Forward Control Anything considered.

1st Apr 2015 5:37pm

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

Maybe it's just the general age thing but it's only you guys with 2.4s whipping the cats out.

1st Apr 2015 9:48pm

K9F

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

TD5s and 2.4s yes cats are easily removed with no complications. 2.2s obviously don't have cats and apart from certain export models of 2.2s that do not have DPFs fitted I've yet to hear of a 2.2 Defender DPF removal in the uk. 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!!

1st Apr 2015 10:20pm

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

K9F wrote:
2.2s obviously don't have cats

What makes you say that?

1st Apr 2015 10:38pm

K9F

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

From the downpipe rearwards the exhausts are exactly the same be it 2.2 or 2.4. The CAT on a 2.4 is not connected to the ECU and as such can be removed without any further implications or affects to the running. The DPF is a completely different kettle of fish.....a DPF is not the same as a Catalytic Convertor.

From the Alive website as an example......

This ALIVE Exhaust System does not come with a Decat Downpipe Section, as the Puma 2.2 TD4 Model is fitted with a Diesel Particulate Filter, which can not be removed.

http://www.alivetuning.com/alive-boutique/...duct_id=83

The difference between a DPF and Catalytic Convertor explained.....

http://filter.ezinemark.com/difference-bet...09b3d.html 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!!

2nd Apr 2015 7:08pm

munch90

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

All or most dpf vehicles have a cat and dpf , most new ones are in one unit , some older vehicles in two separate units

saying that k9f , i knew what you ment

There are some companys programming out the dpf in the ecu program /map , then you knock the centre out of dpf , not heard of any land rovers being done ( YET !! )

2nd Apr 2015 7:17pm

K9F

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

There's a van that conveniently parks outside several dealerships that are very close together near me with advertising on the side stating that they can offer 'a DPF removal service' I was wondering after last year February's MOT legislation regarding Cats and DPFs how their business was affected? Still appear to be parked there most days.

My point regarding DPF/Cat removal on a 2.2 was twofold. Those that do so on a TD5/2.4 find it an easy uncomplicated process. Not so on a 2.2 that's why nobody has done it as far as I know. There was discussion on the forum about the availability of south African ECUs fitting it and just binning the DPF off a 2.2 as a viable option sometime ago. 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!!

2nd Apr 2015 8:37pm

T1G UP

Member Since: 08 Dec 2009
Location: Bath
Posts: 3101

2011 Defender 110 Puma 2.4 XS CSW Orkney Grey

ignore my PM!

i have a 2.4 with both options of catted and de catted pipe.

2.2 pah!

2nd Apr 2015 8:43pm

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

K9F wrote:
From the downpipe rearwards the exhausts are exactly the same be it 2.2 or 2.4. The CAT on a 2.4 is not connected to the ECU and as such can be removed without any further implications or affects to the running. The DPF is a completely different kettle of fish.....a DPF is not the same as a Catalytic Convertor.

But a 2.2 (UK spec) has both a cat & a dpf.

3rd Apr 2015 8:05am

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