how does a tuner effect the cat?

Discussion in 'Touring Models' started by last12know, Mar 27, 2011.

  1. last12know

    last12know Member

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    have read numerous threads on efi tuners.. ied's, tfi and pcv as just a few examples but no one mentions if running one with a stock exhaust will cause a short life span for the cat. since it's running richer wouldn't it soot up and clog the cat?
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Very good question, I would guess it would set a code long before this
     
  3. glider

    glider Veteran Member

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    More fuel will cause the cat to run hotter, this could result in a melt down if it gets hot enough but the added heat may also burn things off to a point depending on how much hotter it runs.
    Either way it would shorten the life expectancy and if you experience a lack of power while running a tuner, this would be an indication there was a problem with the cat.
     
  4. last12know

    last12know Member

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    wouldn't more fuel stop a lean mix which makes bike run hot? wasn't concerned about the temp as i would think it should actually drop at the expense of creating soot. hmmmm.... am i way off?
     
  5. Jack Klarich

    Jack Klarich Expert Member

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    These tractors are going to burn only so much fuel, the extra like Glider said could indeed cause a melt down in the cat, on cars I have seen them so hot you could almost see through them, I would change the pipes but keep the cats in case JMO
     
  6. glider

    glider Veteran Member

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  7. glider

    glider Veteran Member

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    Great explanation Smitty!
     
  8. last12know

    last12know Member

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    thanks... that explains a lot... reacts with fuel to help burn it off. makes sense.. so in short if i want my bike to run cooler and pretty much stay stock i still have to remove the cat and get a tfi.
     
  9. Jack Klarich

    Jack Klarich Expert Member

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    That will do it but keep the cats in case the EPA police are lurking ECM Calibration And TFI - Harley Davidson Community here is a good start for understanding TFI
     
  10. last12know

    last12know Member

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    firm believer in keeping spare parts..lol have a 70 xlch boattail i can't get a stock exhaust for. so i bought a complete takeoff exhaust from a road king for 50 and a complete exhaust from a flhx for 60. includes heat shields and cats so i'm good for a bit. got the roadking exhaust in case i wanted the dual look. the roadking hadn't even been run when removed.. nice and shiny. no bluing.. the other only has a 1000 miles on it.. looks almost new as well.