E39 530D - Decat?

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  1. E39 530D - Decat? 
    #1
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    Hi guys,

    If I was to decat my 530d, firstly would it be worth it in terms of speed, noise economy etc, what would the differences be?

    And secondly, come MOT time, would it still pass? As I know petrols 99% of the time won't pass the MOT with a decat?

    Thanks
     
     

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    Hey!!

    Speed, you won't really get an increase
    Noise, a little more but poss not notice it
    Difference, I would say the car would feel more responsive!

    MOT - It would pass up until April, where a new rule comes in saying, if a CAT has been obviously removed this would be a fail - so even if it would pass the emissions test if the CAT looks to be removed it would fail

    Mike
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    sorry to hijack this thread, but i am also interested in this. My exhaust system (525d) is the one on the bottom, it looks like the centre section has another 2 cats on there as well??can anybody verify?

    RealOEM.com * BMW E39 525d Catalytic converter/Front silencer
     
     

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    Unifab what year is your car?

    Mike
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    Diesels won't fail if the CAT is removed, as testers can't tell what type of system is fitted(CAT, DPF, e.t.c) so you will be fine, even from April 01st, but the ministry are looking into diesel CAT/DPF removal in future so it won't be the end of it.

    The fitment of a catalytic converter to petrol engine vehicles is mandatory for vehicles of the specified age and type e.g. passenger car, goods etc. The MOT Inspection Manual can therefore specify exactly what petrol engine vehicles must have a catalyst fitted.

    However, whilst diesel engine vehicles are required to meet certain emissions limits for Type Approval, the method used to achieve this is not specified. It was left to the engine manufacturer to decide how to meet Euro 3, 4, 5 etc emissions standards.

    For this reason, testers would be unable to readily determine which vehicles are OE fitted with a Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF) or Selective Catalytic Reduction (SCR) system.

    It was therefore considered that the introduction of a Reason for Rejection for a missing diesel catalyst at this stage, whilst complying with the Directive, was likely to lead to many incorrect failures, which is clearly unacceptable.

    The matter is under review and may therefore change in the future.
     
     

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    Thank you for clearing that up, i have my car booked in for the decat tomorrow, so im hoping it will go well!

    Mr OBD, my car is a 2002 525d sport
     
     

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    anybody thinking about decatting their diesel, i highly recommend it! i was getting constant boost problems at 2k rpm, either a flat spot or over boost, i had changed all the PC's, vac pipes, even the turbo actuator (and probably more), but it was due to the cats! now the car is alot smoother and eager after 2k rpm and just feels so much nicer to drive. However, it does increase cabin noise slightly (but i have had my rear box removed aswel!). overall, im very happy!
     
     

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    How To Remove Cat and fit a decat on e39, 525 / 530d

    ST/STEEL BMW E39 530D 525D CAT DECAT EXHAUST DOWNPIPE

    Thought i would post this hear


    I decided to get mine replaced last year as the flexi pipe was getting a little dark, I spoke to Ecotune UK direct and got a little discount, the following day the item was on my doorstep

    The new item on the left



    Start by undoing the torsion bar bolts, this need to be done so you can move it out the way to get the old unit off





    Un Do the 2 bolts holding the brackit to the turbo




    Then Un do the 4 bolts holding the twin pipes together, I used lots of WD40 initialy, one was siezed and another bolt was rounded off so i used a grinder in the end.




    Then, put the new item in place, dont bolt the top end on at the stage



    Put the 2 bottom pipes in place and home the bolts in place but dont tighten them up

    This is just to keep every thing in place



    Tighten every thing up slowley, doing the 2 top bolts first, and then the fore bottom bolts untill its all nice and tight.



    Do the torsion bar back up

    Put your under tray back in place

    Then turn the engine over and listen.

    I noticed the power gain stright away, the exceleration is more responsive, and the Turbo spools quicker, all in all, a good performance mod


    BMW its an addiction, Its a drug
     
     

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    Quote Originally Posted by ragtop steve View Post
    I noticed the power gain stright away, the exceleration is more responsive, and the Turbo spools quicker, all in all, a good performance mod
    ...and an instant MOT failure from April....
    "So give me one more platinum plaque and rap, you can have it back." - Dr Dre

    Spinnin' on digital 22's!
     
     

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