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tomdaprince

Member Since: 23 Feb 2015
Location: IJmuiden
Posts: 54

2007 Defender 90 Puma 2.4 HT Tonga Green

Decat damaging engine?

Good morning chaps,

My 2.4 Puma has done 230.000km, has a BAS remap and Griffin Decat exhaust system, now she has been developing a high sump pressure and some starting problems etc, to much for me to find the issue. She has been at the stealers to determine the cause and they claim the decat and tuning are damaging the engine and will result in a premature death. The remap I can understand but the decat not really, doe anyone have any experience with this?

28th Mar 2017 7:54am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7709

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Sounds to me like they don't know either Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

28th Mar 2017 8:09am

pannawonica

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

I would say a high quality BAS remap if anything would make your engine last the same or longer than normal OEM. A Decat is also beneficial too engine life, allowing better heat flow! I would really like too know their technical explaination, but I think they are really being disingenuous!

28th Mar 2017 8:16am

ian series 1

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

2008 Defender 90 Puma 2.4 CSW Bonatti Grey

I De catted mine the day I got it, and never had any issues,
Much more free reving than in standard form.
The cat is very restrictive, which in my book is a bad thing!

De catting any engine should have nothing but positive results, except a slight increase in emissions from the tailpipe. 80" 80" 86" 88" 90"

Wanted, Forward Control Anything considered.

28th Mar 2017 8:49am

Morepower

Member Since: 08 Jan 2013
Location: Fife, Scotland
Posts: 630

Turbo back pressure can be an issue in some cases (I have no idea on a defender)... However, the engineers who developed the engine will have known the expected back pressure on the turbo and designed it in accordance... Removing this 'back pressure' can cause premature turbo seal failure and in some cases, turbo overboost at low speed... Did Pete know that the cat was removed as he may have had to 're-jig' the map... Although your best to contact him directly as he is the expert on this.... I have spoken to him many times regards the removal of both my cat and dpf's... His reply has been to leave it as intended... So I have done..

Regards

Tim It doesn't matter how bad it is, It can always get worse...

2013 Bowler 110 (Sold)
2016 Bowler 90 Rally Spec (Sold)

Last edited by Morepower on 28th Mar 2017 5:14pm. Edited 1 time in total

28th Mar 2017 10:00am

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2082

I don't know the Puma engines very well but similar things can happen on TD5s which is sometimes down to a failed depression control unit in front of the turbo. You could fit a Provent 200 catch can/breather which may help the issue.

Having no CAT/DPF would not cause this issue, think about it, all you've done is remove a restriction inside the exhaust pipe.

28th Mar 2017 11:21am

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