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Changing Cats, Tune?

Discussion in 'VF Holden Commodore (2013 - 2017)' started by Banjo79, Jul 30, 2018.

  1. Banjo79

    Banjo79 Active Member

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    Saving the dolphins on Friday. Finally got the car booked in to go from 100 cell to 200 cell and wondering if a tune is an absolute necessity? Exhaust guy doesn't seem to think it will throw a code or need tuning.
     
  2. eman1

    eman1 Active Member

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    Nah no tune needed, at worst just reset a code if it does throw one. Doubt it would though
     
  3. vr304

    vr304 Well-Known Member

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    Chances are the rear o2 sensors have been turned off in the tune to suit the 100 cell cats so changing the cats won’t make any difference
     
  4. Banjo79

    Banjo79 Active Member

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    Correct gents. Had some Pacemaker 200 cell pancake type installed. No codes thrown. Drives fine, infact possibly better very low in the rev range. Observation also confirmed by the Mrs.
     
  5. NewbC4KE

    NewbC4KE Active Member

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    If I may ask, was your decision to go from 100 to 200 cell to try curb a fuel smell issue ? Is your vehicle currently modified?
     
  6. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    Changing from 100 to 200 cell cats on a VF 2 still won't meet EPA requirements, the VF 2 is Euro 4 and there are no 200 cell Euro 4 cats.
     
  7. Banjo79

    Banjo79 Active Member

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    Yes. Full exhaust and cai installed around 120000km's ago. Fuel smell was getting slowly worse as time went on. Thought Id start with new higher cell cats and front o2 sensors. Might have reduced fuel smell and morning steam by 30%. Still needs a tune me thinks. Its always been fuelly. Was in talks with prominent mail order tuner about my options.
     
  8. Banjo79

    Banjo79 Active Member

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    Its a VF series 1 if that matters. I'm hoping E85 will have me passing emissions testing if need be.
     
  9. dimetime

    dimetime Active Member

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    how does the walkinshaw (difilippo) system pass when getting it fitted from the dealer?
     
  10. NewbC4KE

    NewbC4KE Active Member

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    Pretty sure it doesn't and I highly doubt any kind of testing is done by "authorised" Walkinshaw dealer in regards to emissions once vehicle is given back to dealership to sell on the forecourt. Pretty sure its a change over of the necessary parts depending on package, wack it on dyno does it get certain numbers Y/N back on truck and certificate comes out of a printer.
    Happy days :)
     
  11. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    The Walkinshaw package is still an aftermarket system that is not backed by the factory. It is not Euro 4 compliant unless it uses Euro 4 cats. Euro 4 was introduced in 2008 so the VF has to be Euro 4 compliant. I'm not agreeing with any of it, just stating facts.
     
  12. lmoengnr

    lmoengnr Well-Known Member

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    Euro 5 compliance started late 2015.
     
  13. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    Yes, but I said Euro 4.
     
  14. Banjo79

    Banjo79 Active Member

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    Do cats need markings or id on them, indicating what they are or are vehicles just required to meet those euro standards for any given year regardless of how they are met?
     
  15. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    No they don't need any ID at all. The only way to tell if a cat meets the requirements is an EPA test. Even then, if it passes, it only meets the requirements when it was tested, it can fail the next day and become non compliant. California has the best cat market in the world because of their smog laws, every car needs a smog test every 2 years if it was made after 1975. I would just about guarantee that any car older than 10 years will need a new cat/s every 2 years....
     
  16. Banjo79

    Banjo79 Active Member

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    Thanks for that info. On another note when I got new onea I asked for same diameter, which would have been 4inch and round, instead I got pancaked Pacemaker. Wasn't happy.
    Do you think that style has roughly the same cubic inches of substrate as round?
     
  17. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    Depending on the size of the flat one, if they are the same CPI, then the flat one will have more surface area. EG, 4" round is 7850 mm sq, if the flat one is 175mm x 75mm, it will be 13125 mm sq surface area exposed to the exhaust.
     

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