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Author Topic: THROW OUT THE CAT  (Read 3417 times)

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minilandrover

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THROW OUT THE CAT
« on: 27 June 2011, 00:04:21 »
Hello All you guys with a 1994-1996 omega diesel 2.5, is you engine still kicking out 130bhp?  need a power boost ? want some fun???
Well after repairing my injector pump that started leaking (see my other posting) i fixed the pump, and made good use of the fact the front of the car was off the ground. i had allready opened up a spare front exhaust Cat pipe and done the cat mod. it takes about 1 hour to modify the pipe and one hour or less to swap pipes or remove and refit a modded pipe. So what's the big deal? Well removing the catalyser or cat for short from it's housing and welding it up again means the engine is no longer wasting loads of energy trying to push exhaust gasses through millions of pinholes in the cat block. Take a look at my photobucket albums and look at the picture  editorial that shown how to de-cat your diesel omega 6 cyl engine. (legal in france as it's not compulsory until 1996 to have a cat on a diesel and mine is a 1994.)
What difference does it make? well forget chipping the car this gave mine a 40bhp boost, faster spin up of the turbo, better acceleration, loads more oomph and cleaner, no puff of smoke when i let go a load of g-g'ees as the old cat would try and clear it's throat.
40bhp is just a guess, but it's like i had been towing another car behind for ever and suddenly the tow rope broke!!! wow i have trouble keeping her to the speed limit's as with the throttle just cracked open she is doing 90kph (60mph) and just a tickle whips her up to 130kph in no time. i shall have to do some timed runs and post them on youtube... anyway have a look at how easy it is and have a think about it, and the cat block removed is done so keeping it intact so you can sell it for re-cycling, they are worth 50 quid.. :y   here is the link..
http://s595.photobucket.com/home/minilandrover
now a mod that can pay for it's self straight away most be a first...
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mrgreen

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Re: THROW OUT THE CAT
« Reply #1 on: 27 June 2011, 00:30:36 »
i wish there was something like that for the 2.2!!!
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minilandrover

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Re: THROW OUT THE CAT
« Reply #2 on: 27 June 2011, 19:27:20 »
Well i am just wondering how many other omega owners have done the mod. and has anyone had the power at the rear wheels measured before and after? There is a nice woods near where i live and a nice long straight. i might just film a run then try and calculate the 0-60 0-100 time and check it against known figures for the standard car, bearing in mind mine has done 330,000 km's  but for a car that weighs 1.5ton's it's going like a bat out of hell, im not bothered how fast  it goes, just how fast it gets going . can anybody time their tired 2.5 diesel 0-60 and 0-100mph? and post some figures.  ;)  so no cheating spare wheel in the boot and a tank of fuel. ok?  :y
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Abiton

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Re: THROW OUT THE CAT
« Reply #3 on: 27 June 2011, 21:21:20 »
I was a bit dubious about your power-gain claim, a cat just can't be that restrictive...

...and then I looked at your piccies.  Your cat appears to be a block of solid carbon!  No wonder you were down on power.    :o

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Kevin Wood

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Re: THROW OUT THE CAT
« Reply #4 on: 28 June 2011, 13:58:31 »
There'll be a few diesel owners desperately looking for cats when the new rules come in. ;)

http://www.omegaowners.com/forum/YaBB.pl?num=1309121813
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VXL V6

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Re: THROW OUT THE CAT
« Reply #5 on: 28 June 2011, 19:20:16 »
Quote
There'll be a few diesel owners desperately looking for cats when the new rules come in. ;)

http://www.omegaowners.com/forum/YaBB.pl?num=1309121813

Looking at the decat method employed above I think I may go with this approach when I do the my DTi.

I've just got to find someone who will perform the operation...

The MOT test station will presumably only be looking for
the physical presence of a CAT so I would assume that this would pass, especially if the welding is on the upper surface and hence not quite so noticable.
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TheBoy

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Re: THROW OUT THE CAT
« Reply #6 on: 28 June 2011, 19:31:14 »
My old chipped 2.5TD Elite, Automatic ( :'(), could do 0-60 in 9s dead, using stopwatch (not massively accurate). A manual should be noticibly quicker.  Never decatted it though.
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VXL V6

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Re: THROW OUT THE CAT
« Reply #7 on: 28 June 2011, 22:00:24 »
On a 2.2 DTi you need to give it every opportunity to release all those horses  ;D

Fine when it's rolling, it's just pulling away that's gutless after driving the V6
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Brikhead

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Re: THROW OUT THE CAT
« Reply #8 on: 28 June 2011, 23:40:38 »
Quote
I've just got to find someone who will perform the operation...
I feel more than able enough to offer my surgical experience on this tricky procedure.
I even have a fresh blade in my angle grinder...
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blackviper90210

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Re: THROW OUT THE CAT
« Reply #9 on: 29 June 2011, 07:32:50 »
Would gutting the "cats" affect the emissions on a petrol?  :-?
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Abiton

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Re: THROW OUT THE CAT
« Reply #10 on: 29 June 2011, 07:57:46 »
Errr, yes.
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blackviper90210

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Re: THROW OUT THE CAT
« Reply #11 on: 29 June 2011, 08:06:59 »
So I can remove the cat and the car wil be fine, but MOT time, they'll need to be in place.

If thats the case, does it do the car any "harm", ie upset the ecu etc?
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aaronjb

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Re: THROW OUT THE CAT
« Reply #12 on: 29 June 2011, 08:14:03 »
If you did it on a petrol car, aside from failing the MOT every year, you'd have a permanent P0430 'Cat efficiency' code and accompanying light on the dash..

On a diesel (as in this thread) the emissions test is currently visual smoke only (soon to be visual smoke plus the visual presence of a 'CAT')
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blackviper90210

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Re: THROW OUT THE CAT
« Reply #13 on: 29 June 2011, 08:19:17 »
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If you did it on a petrol car, aside from failing the MOT every year, you'd have a permanent P0430 'Cat efficiency' code and accompanying light on the dash..

On a diesel (as in this thread) the emissions test is currently visual smoke only (soon to be visual smoke plus the visual presence of a 'CAT')
That makes sense, ok. Ref the fault code though, if the cat was then refitted for the MOT, would the codes/light go out, or will it need resetting?
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hoofing it

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Re: THROW OUT THE CAT
« Reply #14 on: 29 June 2011, 08:24:21 »
Quote
I was a bit dubious about your power-gain claim, a cat just can't be that restrictive...

...and then I looked at your piccies.  Your cat appears to be a block of solid carbon!  No wonder you were down on power.    :o

This won't happen if you boot the total crap out of it buy holding the car in second and taking the revs to 4500rpm every 2weeks :D
All diesels need to get a good blast or they soot up :y
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