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NCT and straight through exhaust?

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  • 13-08-2014 8:58pm
    #1
    kapisko1PL
    Registered Users Posts: 277 ✭✭


    Just like in the title.

    I just bought the car (used) and it failed NCT when the old owner was trying to put it through. Reasons: Exhaust System Noise - Silencer - Missing. It is also leaking a little which is easy to fix.

    Can a car with a straight through exhaust pass the NCT nowadays or did something change since I remember people saying that it can...

    Is is a Seat Toledo 1.9TDI


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    #2
    stimpson
    Registered Users Posts: 7,815 ✭✭✭stimpson


    Pre 92 didn't need a cat. Silencer is needed to keep noise below 100db (I think)

    Edit: 99db is the limit (measured from 1 metre)


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    #3
    mphalo1
    Closed Accounts Posts: 186 ✭✭mphalo1


    no it wont pass!! everyone that has a straight through exhaust always has the original at home to bolt on for nct so you may go to a breakers and pick one up


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    #4
    stimpson
    Registered Users Posts: 7,815 ✭✭✭stimpson


    I had a straight through decatted exhaust with a bung to keep the noise down. It was rated at 98db. Passed every time.


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    #5
    pablo128
    Closed Accounts Posts: 6,221 ✭✭✭pablo128


    Diesels that are running well will pass an nct without a cat. If it has pigeon sh1te welding on the replacement pipe that's also leaking, I can imagine it would be mentioned on the fail sheet alright. A leaking exhaust will definitely fail.


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    #6
    kapisko1PL
    Registered Users Posts: 277 ✭✭kapisko1PL


    The diesel is great but the pipe is a bit damaged (welding, o-ring or something like that) and I am going to fix it this week. To me it is not bad but you can hear the hole in the exhaust.


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    #7
    mphalo1
    Closed Accounts Posts: 186 ✭✭mphalo1


    so your saying they failed it on the hole in the exhaust not the fact its a straight through ? I'd of thought it would fail on emissions and noise but probably not noise as its a diesel


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    #8
    kapisko1PL
    Registered Users Posts: 277 ✭✭kapisko1PL


    You see, the old owner put it through and it failed on the noise and it said the silencer was missing but it is probably it is too loud because the pipe disconected at some point. I just want to know if someone has a straight through exhaust and ever had any problems doing the NCT?


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    #9
    pablo128
    Closed Accounts Posts: 6,221 ✭✭✭pablo128


    Failing the test because of a hole would be more from a safety point of view. At a standstill there is a high risk of exhaust fumes entering the car, which could potentially kill you or your passengers.
    If the car passes the db and smoke test, it should make no difference if it's missing a silencer.


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    #10
    dgt
    Closed Accounts Posts: 12,985 ✭✭✭✭dgt


    kapisko1PL wrote: »
    Just like in the title.

    I just bought the car (used) and it failed NCT when the old owner was trying to put it through. Reasons: Exhaust System Noise - Silencer - Missing. It is also leaking a little which is easy to fix.

    Can a car with a straight through exhaust pass the NCT nowadays or did something change since I remember people saying that it can...

    Is is a Seat Toledo 1.9TDI

    Won't pass, needs backbox.

    Buy backbox, install for test, get cert, replace box with straight pipe

    Source: I drove a full straight piped diesel (from the turbo) for a year and a half :cool:


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    #11
    Cleveland Hot Pocket
    Registered Users Posts: 5,193 ✭✭✭Cleveland Hot Pocket


    Just buy a car pre 1991 and you are graand !
    No stupid Cat needed there.


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    #12
    kona
    Registered Users Posts: 7,525 ✭✭✭kona


    betterget that hole fixed or the pidgeons will escape :eek:


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