Torque Cars

Catalytic

Discussion in 'Mercedes Forums' started by MHOLST, 8 February 2012.

  1. MHOLST

    MHOLST New member

    Messages:
    9
    From:
    Oslo Norway
    Car:
    e320 avantgarde
    Hi Guys
    I just have a question om my MB e320 w210 i got 2 cats (straight engine not the V6) and am planing to get a sports cat ( am gona replace the whole exhaust) is it ok just to use one cat. the cats thats on the car now sits beside each other.
    Whould be happy for reply on this :)
     
  2. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,306
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    You can only really go down to one cat if the entire exhaust stream flows through it. So if it splits before the cat you will need two but if you can split the exhaust after the catalyst you should be ok with one but you'll need a bigger catalyst as you are going from two down to one.
     
  3. MHOLST

    MHOLST New member

    Messages:
    9
    From:
    Oslo Norway
    Car:
    e320 avantgarde

    Hi Wayne
    Many thanks for your reply ( i tryed to add a photo of the exhaut but it didnt work)

    There is one pipe from each headers that goes in to one pipe and this pipe splits for the two cats and there is one pipe after each cat that goes into the muffler .From the muffler and out there is only one pipe that goes to the backbox.
    I was thinking of using a bigger cat and bigger pipe (3 inch) all the way between the muffler and backbox .Am gonna change the muffler and backbox to.
     
  4. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    41,306
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    Just make sure the surface area of the catalyst is the same as that of the original cats to maintain the flow rate, and try not to introduce any sharp bends in ether pipe work.
     
  5. MHOLST

    MHOLST New member

    Messages:
    9
    From:
    Oslo Norway
    Car:
    e320 avantgarde
    The pipe that goes into each cat are 2 inch
     
    Last edited: 14 February 2012
  6. Charliep

    Charliep Torque Junkie

    Messages:
    125
    From:
    Thurrock, UK
    Car:
    Alfa GTV & 33
    The reason for the 2 cats is emission regulation requirements and the need to run 2 pipes (secondary length) for exhaust calculation reasons.

    Depending on the regulation in different countries in Europe it might be a problem to bring the cat too far away from the engine.
     
  7. MHOLST

    MHOLST New member

    Messages:
    9
    From:
    Oslo Norway
    Car:
    e320 avantgarde

    so i guess its best to go for two cats then.
    How do i add photos here ??
     
  8. pgarner

    pgarner TC ModFather Moderator

    Messages:
    16,521
    From:
    Lockerbie, SW Scotland
    Car:
    Octy smoke machine
    you need 10 posts - give it a while for the forum to notice and your name will turn bold.
    host the pictures on the likes of photobucket and paste the IMG code.


    (can take around 1/2 hr for the forum to refresh the users after you make the 10 posts as soon as you see your name in bolt youll have the ability to post pics, link and use PMs - please dont post links that may be seen as advertising or competing sites )
    PGarner
     
  9. MHOLST

    MHOLST New member

    Messages:
    9
    From:
    Oslo Norway
    Car:
    e320 avantgarde
    Many thanks for the info :)
     
  10. Charliep

    Charliep Torque Junkie

    Messages:
    125
    From:
    Thurrock, UK
    Car:
    Alfa GTV & 33
    Yes, and make a boss for post lambdas. The cats do not need to sit exactly side by side if it is a space issue.
     
  11. MHOLST

    MHOLST New member

    Messages:
    9
    From:
    Oslo Norway
    Car:
    e320 avantgarde

    Its only one Lambda on the exhaust it sits in the Y-split just infront of the cats. its plenty of space for two cats
     
    Last edited: 15 February 2012

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