What is this (exhaust pic)

Discussion in 'Prius c Accessories and Modifications' started by Priusxrs, Jun 22, 2014.

  1. Priusxrs

    Priusxrs Junior Member

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    [​IMG][​IMG]
    So I was messing around with my exhaust again and wondered what is this and do I need those hoses coming off it. Reminds me of the 2nd air pump crap that was on my corolla but it was part of the manifold

    SGH-T889 ?
     
  2. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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  3. Easy Rider

    Easy Rider Active Member

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    My guess is catalytic converter. If that's what it is, then yes all the hoses are necessary. In general, they don't put parts on a car that are not necessary........for something. :)
     
  4. Priusxrs

    Priusxrs Junior Member

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    Well u dont need a muffler but they have them on lol

    SGH-T889 ?
     
  5. bisco

    bisco cookie crumbler

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    agreed, i don't think they're necessary. just extra weight.
     
  6. Stevie

    Stevie Junior Member

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    and too slow down the exhaust gases so the exhaust valves don't overheat
     
  7. Priusxrs

    Priusxrs Junior Member

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    So straight piping is a problem?

    SGH-T889 ?
     
  8. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    not if gas mileage is not a concern. If you bought the car to get gas mileage, it is perfect now.
     
  9. Easy Rider

    Easy Rider Active Member

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    You slow down the exhaust gasses to make their exit quieter and to prevent the exhaust valves from over-COOLING.
    A slightly restricted exhaust keeps the exhaust ports on the engine at a more even temperature, slightly higher.
     
  10. Tideland Prius

    Tideland Prius Moderator of the North
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  11. mertechperformance

    mertechperformance Active Member

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    I wouldn't change anything but the axle back...
     
  12. '04Prius

    '04Prius Junior Member

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    Wouldn't the catalytic converter restrict the exhaust gasses enough? I think that the muffler would just make it quieter.
     
  13. Easy Rider

    Easy Rider Active Member

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    Maybe. I don't know.
    I don't think the CAT really provides much restriction.
    If the gasses don't slow down, they don't quiet down either.
     
  14. mertechperformance

    mertechperformance Active Member

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    New catalytic converters only eat 4 to 9hp. Not nearly as bad as they used to be. Ps if you go straight pipe it'll be a mellow volume yet nasty rice sound. I tried it. Ended up getting a muffler and glad I did. I wanted to do mid pipe but figured a low in toque might hurt mpg. So went with just the axle back as 1 is easier to go back to stock and not much of anything Matters THAT MUCH that far down the exhaust system.

    SGH-T889 ?
     
  15. Priusxrs

    Priusxrs Junior Member

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    Ive been running it with no muffler for around 20k miles wanted to see if it got any louder and more mpg with less resistance :/
     
  16. mertechperformance

    mertechperformance Active Member

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    Yeah I hated the ricey rasp. With my intake and exhaust my mileage is the Same to slightly better

    SGH-T889 ?
     
  17. '04Prius

    '04Prius Junior Member

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    Did it? I would think that you would. I did some reading, and found that if you went "true" straight pipes (no catalytic converters, no muffler) it would hurt your performance/mpg. These engines are designed to have some back pressure, and I read that no back pressure would screw up the air/fuel mixture. Also some sources said that a performance muffler was better than straight pipes. I just don't know which would provide the most boost in mpg.
     
  18. pmike

    pmike Member

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    99.9% sure that is the exhaust heat recovery system. The cat is upstream from that.
    Neither. Toyota didn't leave any MPGs on the table. Only thing I have seen that has a measurable difference is grill blocking in cooler weather.
     

    Attached Files:

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  19. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    The Prius does not have an Otto cycle engine, so old wives tales don't work. You can piss off your neighbors, but it is just louder, not better in any way.

    In an Otto cycle engine the gasses are still expanding in the exhaust, in a Atkinson cycle engine the cylinder area when expanding is larger than when under compression, so the gases can expand more fully in the engine where it does work. (Not in the exhaust where it makes back pressure)

    (best picture I can find is in German)

    [​IMG]
     
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  20. olieman

    olieman Junior Member

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    Hallo, my name is Tony from the Netherlands, I have only recently joined this wonderful forum.

    Now, about this funny looking exhaust, it is used to warm the heater water of the Prius C.
    wich is similarly as in my European version the Toyota Yaris Hybrid.
    See the attached drawing.
    upload_2014-11-15_16-21-44.png
     
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