Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Please note that it is not permitted to have referral links posted in your signature. Keep these links contained in the appropriate forum. Thank you.

https://www.boards.ie/discussion/2055940817/signature-rules
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Nct, Straight thry exhaust, Implications

  • 11-01-2013 4:46pm
    #1
    kermitpwee
    Registered Users, Registered Users 2 Posts: 1,696 ✭✭✭


    Thinkinh of buying an old golf diesel that has a straight thru exhaust, will there be problems with the Nct on noise and modification? I dont think the exhaust runs the whole length of the car


Comments

  • #2
    djimi
    Registered Users, Registered Users 2 Posts: 13,237 ✭✭✭✭djimi


    If the car is meant to have a cat and doesnt then it doesnt stand a hope in hell of passing on emissions.


  • #3
    kermitpwee
    Registered Users, Registered Users 2 Posts: 1,696 ✭✭✭kermitpwee


    djimi wrote: »
    If the car is meant to have a cat and doesnt then it doesnt stand a hope in hell of passing on emissions.

    Never had a cat, its a mk2 golf.Thanks


  • #4
    slimjimmc
    Registered Users, Registered Users 2 Posts: 7,786 ✭✭✭slimjimmc


    According to Sect 54 of the NCT Manual a missing or non-functioning silencer is a fail, so your straight-through should be marked as a fail. Even with a silencer the noise level has to be below 99dB(A). And if any fumes enter the cabin that's another fail.


  • #5
    dougie-lampkin
    Closed Accounts Posts: 677 ✭✭✭dougie-lampkin


    djimi wrote: »
    If the car is meant to have a cat and doesnt then it doesnt stand a hope in hell of passing on emissions.

    Emissions? On a diesel? I would be very doubtful of an 80's diesel having a cat to begin with anyway.

    I'm pretty sure the "missing silencer" means that your silencer has actually fallen off, and not been replaced with a straight pipe. Once it doesn't deafen the tester I'd imagine you'll be OK, given the age of the car. If it's the turbo diesel then there's a good chance it would still be less than 99dB, since the turbo acts as a silencer.


  • #6
    kermitpwee
    Registered Users, Registered Users 2 Posts: 1,696 ✭✭✭kermitpwee


    slimjimmc wrote: »
    According to Sect 54 of the NCT Manual a missing or non-functioning silencer is a fail, so your straight-through should be marked as a fail. Even with a silencer the noise level has to be below 99dB(A). And if any fumes enter the cabin that's another fail.

    Thanks mate.


  • Advertisement
  • #7
    [Deleted User]
    Posts: 23,339 ✭✭✭✭ [Deleted User]


    djimi wrote: »
    If the car is meant to have a cat and doesnt then it doesnt stand a hope in hell of passing on emissions.

    Cat does little to nothing for diesel emissions :)


  • #8
    djimi
    Registered Users, Registered Users 2 Posts: 13,237 ✭✭✭✭djimi


    RoverJames wrote: »
    Cat does little to nothing for diesel emissions :)

    Fair enough; I dont have a lot of experience of diesel so didnt realise that:o


  • #9
    101sean
    Registered Users, Registered Users 2 Posts: 2,884 ✭✭✭101sean


    You can decat a turbo diesel and put a straight through pipe and it will make no difference to emissions testing, know of several Td5 Defenders like it. Diesels are only tested on smoke opacity.

    Noise is a different matter, the turbo is a pretty effective silencer but you'll hear it whistling from a long way off!


  • #10
    corkgsxr
    Registered Users, Registered Users 2 Posts: 3,404 ✭✭✭corkgsxr


    I took out the cat of my 1.6hdi Berlingo and replaced with stainless pipe.

    Seems nippyer. But when you come off the throttle you can hear the turbo slow down fast. Normal?

    Still has backbox


Advertisement