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    De Cat or not!!??

    Hey guys. Hoping someone can help me here. Cars going in Monday and i have the option of de-catting it which i think id like to do to improve response and performance along with the remap. I just wanted to see if anyone has ever done this before and had any issues especially on the auto box?

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    You're probably better off going 3" downpipe with sports cat (with appropriate map)

    De-cat can cause serious insurance issues and there's a chance you'll fail the emissions tests come MOT time. Sports Cat is an option that will probably be a lot easier to live with.

    BSR stage 3, BSR Stainless Exhaust, Vibratechnics gearbox Mount, OZ 17" Superturismo Alloys, Bell FMIC, LED Side lights, LED interior Lights, Tinted Windows, Eibach Sports Springs, K&N Air Intake, 3" Sports Cat and Downpipe, Debadged, EST Strut Brace, EST Grille, Black Moose Stickers, Bilstein B8 Dampers, Fully Polybushed, CC3 all round, CF Wingmirrors
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  3. #3
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    a 19t just isn't laggy enough
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    being a P2 i bet it won't like it, got to have to 2 lamba sensors surely?

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    Quote Originally Posted by Peanut1 View Post
    Hey guys. Hoping someone can help me here. Cars going in Monday and i have the option of de-catting it which i think id like to do to improve response and performance along with the remap. I just wanted to see if anyone has ever done this before and had any issues especially on the auto box?
    Oi Nut!

    Beware of the plod pulling you over and checking whether you have a cat or not....it is illegal not to have a cat when the car was made to have one.

    The way you drive, you are bound to get pulled for trying to do doughnuts in Tesco's car park.......its not an M3 you know!

    How about bashing the innerds out of the existing cat to create a de-cat that looks like you still have one. Has anyone tried this and would it stll cause issues with the Lambda sensors??

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    Aside from the Police problem ^^^ mentioned above, the P2 is fine with a decat. All you need to do is use a Lambda probe spacer to space the probe away from the main gas flow. You shouldn't even get a warning light then, let alone limp mode etc.

    On the V70 R, it's hard to do because of the prop shaft being near the exhaust etc, but, on the T5 it should be fairly easy.

    Decat will see faster spool up, sometimes as much as 500-1000rpm lower down the revs, increase power, increase response with the added potential of popping flames with a remap

    I personally will be decatting my S60 R... when money allows, which isn't at the moment.

    I wouldn't bother with race cats. Whilst they will pass the MOT etc and are fractionally better than a normal cat, the full benefit comes from removing the cat completely.

    Hope this helps.

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    Quote Originally Posted by I want a T5 View Post
    Oi Nut!

    Beware of the plod pulling you over and checking whether you have a cat or not....it is illegal not to have a cat when the car was made to have one.

    The way you drive, you are bound to get pulled for trying to do doughnuts in Tesco's car park.......its not an M3 you know!

    How about bashing the innerds out of the existing cat to create a de-cat that looks like you still have one. Has anyone tried this and would it stll cause issues with the Lambda sensors??
    I apologise for my mate!!! And your the one whos eaten all the doughnuts!! HAHA!!

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    If quicker spool is the main benefit I think I'm alright as you can cough on the wee turbo on the S40 and it spools

    BSR stage 3, BSR Stainless Exhaust, Vibratechnics gearbox Mount, OZ 17" Superturismo Alloys, Bell FMIC, LED Side lights, LED interior Lights, Tinted Windows, Eibach Sports Springs, K&N Air Intake, 3" Sports Cat and Downpipe, Debadged, EST Strut Brace, EST Grille, Black Moose Stickers, Bilstein B8 Dampers, Fully Polybushed, CC3 all round, CF Wingmirrors
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    Hi i am running a decat (cut out and welded back up) on a c70 t5 1998 fly by wire throttle twin lamba, i bought a lamba spacer but never fitted it as it has never put up a warning light ??? The car is running 1.4 bar flat out so no boost issues HLM mapped Ecu and the torque is fantastic, it flew round cadwell park this year and it has been 6 months since i cut out the cat and this is the big plus fuel consumption has risen from 22.4 on the display to 28.8 most of the time

    Regards
    Rob Gray

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    Quote Originally Posted by viggen View Post
    Hi i am running a decat (cut out and welded back up) on a c70 t5 1998 fly by wire throttle twin lamba, i bought a lamba spacer but never fitted it as it has never put up a warning light ??? The car is running 1.4 bar flat out so no boost issues HLM mapped Ecu and the torque is fantastic, it flew round cadwell park this year and it has been 6 months since i cut out the cat and this is the big plus fuel consumption has risen from 22.4 on the display to 28.8 most of the time

    Regards
    Rob Gray
    I had 99% decided i was doing it and thats just made it 100%! cheers!

  12. #10
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    Quote Originally Posted by Peanut1 View Post
    I had 99% decided i was doing it and thats just made it 100%! cheers!
    Good luck. Let us all know the outcome as i would be interested in this. Thou i anm with Monkey on the Lambda issues and EML coming on all the time.

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    Will do no worries. Im having at done at a place called fast Road Conversions in Ashford which my mate owns so if it all works out and theres no issues I could introduce you if you wanted

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    Quote Originally Posted by Peanut1 View Post
    Will do no worries. Im having at done at a place called fast Road Conversions in Ashford which my mate owns so if it all works out and theres no issues I could introduce you if you wanted
    Sounds good. I'm only up the road in Maidstone!!

    2004 V70R 6spd manual:: Custom JRtuning REMAP @ peak 21psi :: Custom 2.75" exhaust :: TTV SMF + 07 Clutch :: WG 5.0 psi :: Tints :: IPD R gauge Rev.3 :: CFWerks door pod :: Forge CBV + yellow spring :: Windowed stock housing + blue filter :: Powerflex :: Superpro Engine mount :: Brembo Dot 5.1 :: TW FMIC :: Eibach 5mm spacers :: Brembo 330mm drilled discs :: iMiV 'Classic'+ BT :: D2R XENARC 5500k + LED H7 + LED H3 :: VolvoTech CFE OBD-V1 :: See garage for full mod list

  15. #13
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    get some nice flames out the back too

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  17. #14
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    de-cat is an mot falure from january 2012
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    /\ /\ what he said! /\ /\

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    Has anyone punched out the innerds of the standard CAT?

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    Yes in the past.
    Alastair
    Current: 2009 Cayenne GTS and a 2016 Prius IV... yes.
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    Previous other stuff: Saxo Turbo, 2004 996 C4S, 2008 Z4M, 2001 Yaris T-Sport, 2002 S2000 Mugen, and a 1999 Evo VI



  21. #18
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    Quote Originally Posted by I want a T5 View Post
    Has anyone punched out the innerds of the standard CAT?
    I don't know what you mean
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  22. #19
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    Quote Originally Posted by claymore View Post
    de-cat is an mot falure from january 2012
    well that sucks!! good job im friends with my MOT tester lmao
    Back with a 1997 S70 T5 SE

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  24. #20
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    Quote Originally Posted by dazab View Post
    well that sucks!! good job im friends with my MOT tester lmao
    I couldnt possibly comment!!!!!


 

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