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is a catalytic converter needed?

Discussion in 'Performance and Tuning' started by dnielssen2015, Feb 15, 2012.

  1. Feb 15, 2012 at 4:15 PM
    #1
    dnielssen2015

    dnielssen2015 [OP] New Member

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    Dakota
    Kountze, tx 77625
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    hids, recon taillight bar, system.
    is it possible to get better gas mileage by cutting off catalytic converter and making straight pipe? if so how do you override/fool the sensor. or would it be better to just get an aftermarket cc?
     
  2. Feb 16, 2012 at 6:14 AM
    #2
    Lurkin

    Lurkin Well-Known Member

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    Gonna have to call you out on this one. I can't think of any engine situation where a LOWER exhaust gas velocity is a better thing.
     
  3. Feb 16, 2012 at 7:03 AM
    #3
    Lurkin

    Lurkin Well-Known Member

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    Okey-dokey, to me, "in check" means controlling/slowing the velocity. Definitely not what is desired, as exhaust gas velocity is what enables scavenging.
     
  4. Feb 16, 2012 at 7:06 AM
    #4
    DanglingFury

    DanglingFury Creeper

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    Just take it all off. Even the manifolds. You'll notice a difference. :D
     
  5. Feb 19, 2012 at 2:04 PM
    #5
    rdd11

    rdd11 Well-Known Member

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    I removed mine. Wasnt much of a difference in anything really
     
  6. Feb 19, 2012 at 3:41 PM
    #6
    Yamaha Dave

    Yamaha Dave Well-Known Member

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    Take it off, get caught running and get a $2,000 fine.
     
  7. Feb 19, 2012 at 9:44 PM
    #7
    rdd11

    rdd11 Well-Known Member

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    Ye that's why I love Alberta not legally required!
     
  8. Feb 19, 2012 at 9:56 PM
    #8
    bjmoose

    bjmoose Bullwinkle J. Moose

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    Back in the 70s, car makers met the clean air act restrictions by adding catalytic converters, without doing a lot of engine retuning. The losses were fairly dramatic, and removing the cat pretty much took the engine back to how it had been set up before.

    With the situation now, it's more complex. The engine and engine management system is designed from start to finish knowing they're going to be present.

    The short answer is that a well tuned race engine set up for max power obviously won't have cats.

    But, if you just cut off the cats and replace with straight pipe, without changing anything else - it's a coin flip, because the engine control programming and all the calibrations are expecting them to be there.

    Might be better, might be worse.

    Low restriction intake, low restriction exhaust, and retune the ECU on a dynamometer with the new stuff in place - yeah NOW you've got more power.

    Just a hacksaw job? Don't be so sure.
     
  9. Feb 23, 2012 at 3:46 AM
    #9
    01TacoBuz

    01TacoBuz Well-Known Member

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