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Thread: Removing catalizator

  1. #1
    Junior Member
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    Removing catalizator

    Hello just got full exhaust system for my nc750s.
    I look on forums about removing etc.
    But nothing inform about removing and if need to remap ECU or lambada sensor will work will stock ECU.

  2. #2
    Senior Member flyinfree.00's Avatar
    Bike: 2012 NC700x
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    Quote Originally Posted by G3N3 View Post
    Hello just got full exhaust system for my nc750s.
    I look on forums about removing etc.
    But nothing inform about removing and if need to remap ECU or lambada sensor will work will stock ECU.
    Not many people do it because the gains aren't worth it.

    Sent from my SM-G930P using Tapatalk

  3. #3
    Senior Member Removing catalizator
    Removing catalizator
    DirtFlier's Avatar
    Bike: 2013 NC700x/w DCT
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    At the horsepower levels of the NC engine, I wouldn't think removing the CAT from the system would make much of a difference.

  4. #4
    Junior Member
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    Is not cos power but more for sound will improve.
    May concern is its do i need to remap ECU or lambada sensor will work perfect.
    I don't wont bike run lean or damaged engine

  5. #5
    Senior Member
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    Quote Originally Posted by G3N3 View Post
    Is not cos power but more for sound will improve.
    May concern is its do i need to remap ECU or lambada sensor will work perfect.
    I don't wont bike run lean or damaged engine
    If you have concerns about the engine may I respectfully suggest that you just leave it alone !

  6. #6
    Senior Member
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    2012 NC700X........not 750
    I removed mine (Cat) and added a Dan-Moto Exhaust (the Can version, not the shorty pipes). Bike is definitely louder, but not negatively louder to non-motorcyclist (IMO). I have not had it on a Dyno, so cannot quantify my results (power, fuel/air ratio, etc, etc). Unless someone has hard data (before and after runs on a Dyno) SHOWING there are no power gains in removing the Cat, then they are just assuming/guessing there is no improvement..........seat of the pants don't count. To be clear, I'm not stating my NC700 makes more power after removing the Cat........the jury is still out (until I meet them at the Dyno Shop). I hope this thread does not turn into an Emmissions-Preaching thread.....there are a few of those already on the forum, no need to rehash that again.
    Last edited by Moto-Kafe; 13th April 2018 at 09:17.

  7. #7
    Senior Member Krampus's Avatar
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    Quote Originally Posted by Moto-Kafe View Post
    2012 NC700X........not 750
    Unless someone has hard data (before and after runs on a Dyno) SHOWING there are no power gains in removing the Cat, then they are just assuming/guessing there is no improvement..........
    No, plenty of de-cat discussions out there and on this forum, and info on the net. Perhaps you'll be exceptionally lucky with your new resonance chamber and make some gains. Look forward to your dyno results.

    For reference, and likely the best you can achieve w/out re-maps:

    A full Arrow system add 3% by their numbers: https://www.solomotoparts.com/Arrow-...-NC700X-12-13/
    That would be 1.3 HP or so.

    Of course we've gone over this before: Exhaust system
    Didn't scale the dyno map for the Giannelli, but looks like 1 HP or so increase.

    But even Delkevic claims anywhere from .5 to 1.0 HP gain on their dyno maps for just slip-ons, depending on the level of illegality for the dB.
    Delkevic US Motorcycles | Honda | 2012 | NC700X (2011-2015)

  8. #8
    Junior Member Jim Mc's Avatar
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    Best to leave it. Modern engines are a *system* of interrelated parts, including the cat converter, and you're likely to lose power and mileage (which a dyno can't measure very well) if you fiddle with the bits.
    Jim
    ------------------------------------------
    Winter is icumen in
    Ludly sing Godam.
    - Medieval folk song, revised

  9. #9
    Senior Member
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    And you may also damage the exhaust valves in the long run as gaz flow / pressure is modified. Exhaust systems are more complex than just tubing, a straight pipe is not necessarily the best if the engine was not designed for it.

  10. #10
    Senior Member Removing catalizator
    Removing catalizator
    DirtFlier's Avatar
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    A lot of trouble and money to pick up 1 HP.

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