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How does the exhaust heat recovery system work?

Discussion in 'Gen 3 Prius Technical Discussion' started by deltron3030, Dec 8, 2010.

  1. deltron3030

    deltron3030 New Member

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    How does the exhaust heat recovery system work and will adding an aftermarket exhaust negate this?
     
    #1 deltron3030, Dec 8, 2010
  2. bwilson4web

    bwilson4web BMW i3 and Model 3

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    [​IMG]
    [​IMG]

    Where is your "aftermarket exhaust" described?

    BTW, the ZVW30 muffler has an electronic controlled bypass valve that opens at high power settings.

    Bob Wilson
     
    #2 bwilson4web, Dec 8, 2010
  3. deltron3030

    deltron3030 New Member

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    not sure im quite understanding the question, but it's a Tanabe exhaust for the 2010 prius.

    this is a pretty helpful noise reduction method, but, if i'm understanding this correctly, is a non issue for me since i got the aftermarket exhaust knowing that it would decrease backpressure / increase noise.

    hopefully, this doesn't affect the heat recovery system, but I'm starting to see (from the pics) that most aftermarket exhausts would come after the heat recovery system
     
    #3 deltron3030, Dec 8, 2010
  4. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Thanks for the link. It looks like they build a quality product. I was looking for more engineering data.

    Have you considered trying to measure the back pressure as well as ICE rpm and MAF?

    The reason I ask is it may make sense to first baseline the stock exhaust installation and then measure the difference with the Tanabe system.

    Please understand, I'm only interested in engineering data . . . something we can do an A-B comparison.

    Bob Wilson
     
    #4 bwilson4web, Dec 8, 2010
  5. deltron3030

    deltron3030 New Member

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    hah, apologies. I understand where you're coming from now...unfortunately i dont have any of that info. but i wish i had...
     
    #5 deltron3030, Dec 8, 2010
  6. bwilson4web

    bwilson4web BMW i3 and Model 3

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    If you still have the 'stock' muffler, you might take a peek and see if there is someway to spoof the valve and see what it sounds like . . . purely for investigative purposes . . . For example, is it a 12 V. signal and what is the electrical load of the muffler. If a power resistor or 'coil' is substituted, does the car detect the fake muffler valve control? Can a manual 'override' work? . . . You know, something to let the folks behind the car know it is moving on engine power.

    Some areas of the country are not so sensitive to engine noise and reducing the back pressure at any speed over 46 mph regardless of engine load might make a measurable improvement in mileage with an impreceivable change in volume:
    [​IMG]

    Bob Wilson
     
    #6 bwilson4web, Dec 9, 2010
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