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Thread: different back box problems

  1. #1
    Regular Member mikey362's Avatar
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    Default different back box problems

    hi guys ive been reading alot about people modifying there cars to dual exhaust rather than single.

    so my question is diesel cars need a certain amount of back pressure to operate correctly so fitting dual exhausts would drop the pressure dramatically right? so are there any problems with back pressure after doing the conversion?

    also does your mpg drop if you do it?

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    Regular Member mhvcbv's Avatar
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    hi m8
    i dont think it matters on diesels.
    i fitted a irmy quad to my 1.8 and still runs the same as before
    so you should have no problem with yours.

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    Regular Member mikey362's Avatar
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    okay mate thanks alot just wanted to check

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    Trim : Sri nav

    Engine : Z19dth

    Year : 2006

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    Diesel turbo engines don't need back pressure. The best exhaust for a diesel turbo engine would just be a straight pipe, no cat and no baffles. Surprisingly, they're not that noisey either.

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    Regular Member mark_647's Avatar
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    I asked this a little while ago as I would like a dual exit...

    Is there a brief and simple description of back pressure anyone could offer ? The only stuff I can find on the net is about 624,000 pages long lol

  6. #6
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    Quote Originally Posted by mark_647 View Post
    I asked this a little while ago as I would like a dual exit...
    The centre box does most of the work, so back boxes aren't really going to make a lot of difference one way or another. My V6 diesel runs just as well with one box (Y-piece blocked at exit), two boxes or no boxes.

  7. #7
    Regular Member mattv6diesel's Avatar
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    Vehicle : Bmw 330d

    Trim : Msport

    Engine : 3.0d

    Year : 2008

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    just they centre and rears on dont worry bout noise turbo diesels are quieter

  8. #8
    Regular Member Caveman_nige's Avatar
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    Vehicle : Vectra and a Signum

    Trim : top of the line in both

    Engine : Z18XE,Z19DTH,Z20NET

    Year : 2006

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    i sold the dual exit exhaust off my petrol 2.0t to a guy on here who fitted it to his diesel with no problems..

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    Regular Member mikey362's Avatar
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    so what do i legally need on my zorst?? because if its just a bit of pipe i can make my own forget spending how ever much on a brand name lol

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