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View Poll Results: Will a de-cat improve your performance in any way?

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  • Yes it stands to reason.

    22 84.62%
  • No don't be silly!

    4 15.38%
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Thread: Is this True????????

  1. #1
    Regular Member Signum-Steve's Avatar
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    Vehicle : Jaguar S-Type V6

    Trim : Sport

    Engine : Petrol

    Year : 2003

    Default Is this True????????

    Your original catalytic converter will typically have 400 or 600 cells per square inch (cpsi), these original cats are restrictive in their flow, typically allowing an open area of around 55-65%.

    A Hi-flow Sports Cat which can be fully integrated into a large bore downpipe, has only 100-200 cpsi depending on application. These cats have an open area of between 75-85%, thus reducing back pressure substantially and increasing flow rates, all very desirable for extracting more performance, especially on turbocharged engines.

    Removing the cat does much the same thing, reduces back pressure = more power?

  2. #2
    Regular Member DAVIDD88's Avatar
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    U should have wrote fao DD lol and I voted yes

  3. #3
    Regular Member Grumpy1954's Avatar
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    Vehicle : Ford Kuga

    Trim : Titanium

    Engine : 2.0dtci

    Year : 2014

    Mileage : 1200

    Default

    Unsure, there has to be a certain amount of back pressure. I'd assume a proper sports exhaust centre, like MIJ, would know what they were doing.

  4. #4
    Regular Member 6009tristanb's Avatar
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    dont know about the figures but it must give you some extra power or why would thousands and thousands of people be doing it
    i think to get better results you need to let it suck air in as well airbox mod air filter for turbos better intercooler (i might be wrong im no expert its just what i gather from reading online)
    ive done airbox mod airfilter plugs as its petrol going to put it on rolling road on saturday if its running ok the next on the list is to take off the 3rd cat under the car (3.2 gsi) and then remap next year

  5. #5
    Regular Member DAVIDD88's Avatar
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    Surely a cat is restricting the car but that's just my opionion

  6. #6
    Regular Member Signum-Steve's Avatar
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    Vehicle : Jaguar S-Type V6

    Trim : Sport

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    Default

    Quote Originally Posted by vectrac150cdti View Post
    Surely a cat is restricting the car but that's just my opionion
    I agree. why is there such things as spotrs cats? Sports cats that peolpe spend hard earned cash on.

  7. #7
    Regular Member pistonpete's Avatar
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    Quote Originally Posted by DTI-Steve View Post
    I agree. why is there such things as spotrs cats? Sports cats that peolpe spend hard earned cash on.
    Think its to keep things more legal, especially with the new mot laws coming in next year...

  8. #8
    Regular Member Signum-Steve's Avatar
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    Vehicle : Jaguar S-Type V6

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    Quote Originally Posted by pistonpete View Post
    Think its to keep things more legal, especially with the new mot laws coming in next year...
    I understand the legal implications pete. I was higlighting the fact that a sports cat increases air flow and reduces the back pressure by giving less restriction resulting in an increase in power. It has the same principle as a De-cat system.
    I believe this to be true?

  9. #9
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    Quote Originally Posted by 6009tristanb View Post
    dont know about the figures but it must give you some extra power or why would thousands and thousands of people be doing it
    i think to get better results you need to let it suck air in as well airbox mod air filter for turbos better intercooler (i might be wrong im no expert its just what i gather from reading online)
    ive done airbox mod airfilter plugs as its petrol going to put it on rolling road on saturday if its running ok the next on the list is to take off the 3rd cat under the car (3.2 gsi) and then remap next year
    If you completely remove ity, it will fail the MOT from Jan 2012 due to the rules changing. You either need to knock the guts out of it and leave it in place, or fit a sports CAT.

  10. #10
    Regular Member 6009tristanb's Avatar
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    Quote Originally Posted by dae36 View Post
    If you completely remove ity, it will fail the MOT from Jan 2012 due to the rules changing. You either need to knock the guts out of it and leave it in place, or fit a sports CAT.
    thats what everybody else keeps saying thats what im going to do is buy a second hand down pipe and cut the cat off it and keep my own in tact as it will only be needed once ayear and when i sell the car it can be put back to normal everything i buy for my car i always keep the orginal stuff so it all can be put back to normal when i sell it

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