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cars with engine conversions/mods, how do they pass the NCT emissions

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  • 01-08-2009 11:09pm
    #1
    joeperry
    Closed Accounts Posts: 527 ✭✭✭


    Hi i'm just wondering how a car with a bigger or modified engine installed :Dwould pass the NCT without failing on the emissions test.


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    #2
    Neilw
    Registered Users Posts: 3,779 ✭✭✭Neilw


    joeperry wrote: »
    Hi i'm just wondering how a car with a bigger or modified engine installed :Dwould pass the NCT without failing on the emissions test.

    Bigger cc engines may have a problem alright. But the likes of remapped turbo both petrol and diesel shouldn't have a problem. Once the original cat or an aftermarket high flow cat is in place they should pass alright.

    My own car has about 30% more power and torque and it passes fine, has a 200 cell sports cat in place of the original.


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    #3
    joeperry
    Closed Accounts Posts: 527 ✭✭✭joeperry


    I often see it when browsing used car ads, they might say 2.0 engine but 1.6 on the logbook.


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    #4
    Neilw
    Registered Users Posts: 3,779 ✭✭✭Neilw


    joeperry wrote: »
    I often see it when browsing used car ads, they might say 2.0 engine but 1.6 on the logbook.

    Mostly jap imports. Some dealers were registering them as lower spec cars to pay less vrt and also so young driver could insure them easier...but that's another days work ;)


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    #5
    tossy
    Registered Users Posts: 9,590 ✭✭✭tossy


    The NCT emission test is not car specific i.e they don't drive in your VW golf and then type in VW golf on the computer to see what the emissions should be,it is based on PPM (parts per million) over three different categories

    before 1986
    1986 - 1994
    94 onwards

    The older cars are allowed higher levels than newer cars (obviously) 99% of engine conversions that i have seen would be pre 94 cars with post 94 engines so you would pass with flying colours.

    How do i know all this? i was worried my own car would fail on emissions on the last test and i did a bit of reading up and got some advice fro ma guy who works in a DOE centre.

    The car passed with flying colours : )


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    #6
    Senna
    Registered Users Posts: 8,800 ✭✭✭Senna


    tossy wrote: »

    before 1986
    1986 - 1994
    94 onwards

    Are you sure those are the years, i had an nct in a 96 petrol car and the emissions co2 fail level was different (higher) than when i nct'd a 00 petrol car, all within a month. Maybe they just change the level during the intervening weeks. The only reason i remember is my 96 car passed but was over the emissions level stated on the 00 cars report.


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