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Thread: mondeo mk3 TDCi

  1. #1
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    Unhappy mondeo mk3 TDCi

    Hi there

    just brought myself a 2004 mondeo mk3 TDCi with the cat straight off the turbo,looking at doing a de-cat but wasnt sure if the turbo needs a little bit of back pressure from the cat,was hoping somone might be able to help me with a little bit of knowledge or experience of this as i really wanna find out if its possible to be done before i atempt it

    Click here to enlarge

  2. #2
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    The exhaust on a turbo diesel is hindered by any back-pressure. The turbo itself is hinderance enough.
    Gut your cat (lol) and refit the empty casing.

  3. #3
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    The TDCI with particulate filter sat under the turbo responds very well to the removal of the DPF and make the engine pull strongly right through to the red line.

  4. #4
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    Mk3 Mondeo TDCIs do not have a DPF, just a small cat, a secondhand cat is worth more than a decat pipe, so you could sell your cat and pick up a decat and make a profit, + a decat pipe flows better than a "gutted" cat

    As above, the exhaust manifold/ turbo creates more than enough back-pressure for the engine, downstream of the turbine, the less back-pressure the better, less back-pressure means the turbine (/then the compressor) spools up quicker & flows more gas

    Very few mk3 Mondeo diesels (Puma) pull well to the redline, (modified or stock) on some the peak power is as low as 3k, some 3.5k, few as high as 4k, no point in revving it past its peak power unless you are flat out in top or just about to brake for a corner etc, (better to change up at peak power point, than "redlining" it - 3.5k is probably a good place to change, as the revs should drop into the torque, ideally you need to get it dynoed, to look at the power/ torque curves)

  5. #5
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    Click here to enlarge Originally Posted by FORD Click here to enlarge
    ... a secondhand cat is worth more than a decat pipe, so you could sell your cat and pick up a decat and make a profit, + a decat pipe flows better than a "gutted" cat
    That's true, but MOT testers are increasingly looking for vehicles to have exhaust systems that haven't been tampered with. The trend is increasing whereby vehicles are failing the test for having decat pipes fitted. The good news is that a stock appearance is sufficient (the test isn't detailed enough to test individual components) - hence, better to gut the cat and leave the casing in situ.

  6. #6
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    Click here to enlarge Originally Posted by fynnbar Click here to enlarge
    That's true, but MOT testers are increasingly looking for vehicles to have exhaust systems that haven't been tampered with. The trend is increasing whereby vehicles are failing the test for having decat pipes fitted. The good news is that a stock appearance is sufficient (the test isn't detailed enough to test individual components) - hence, better to gut the cat and leave the casing in situ.

    On a diesel only the particulates are measured, the presence of a cat is un-nessesary - ive had a decat fitted for years and the car went through the MOT with no problem, (there was some talk of the MOT tightening up on this in 2012/13 - turned out to be rubbish - mostly internet scaremongering from people that did not know the facts) there is no trend where decat pipes are failing MOTs on diesels, (for now, anyway) only on petrols.

    Better to have a proper decat pipe fitted, a gutted cat is a "quick fix" when a decat pipe is unavailable. It can cause turbulence,(as the exhaust gasses expand nto the larger diameter of the inside of the cat, producing a sudden drop in velocity) lack of flow - power loss etc (compared to a well designed decat)

    In the future, if a cat or OEM components become nessesary for future changes/ tightening up of the UK MOT, the decat could be wrapped up in heatwrap to make it look like the shape of the stock cat (so it looked like a heatwrapped stock cat from the outside)

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