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Plug-In Prius: real winter driving

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by john1701a, Nov 12, 2012.

  1. To be precise, there is no top or bottom, the air all goes to a common chamber and is then sucked in thru the common radiator grill which is subdivided into engine cooling and inverter cooling. God did have something to do with it.
     
  2. How did you know that? Did those same voices speak to you?
     
  3. bisco

    bisco cookie crumbler

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    well, i don't know if they're the same voices...
     
  4. jsfabb

    jsfabb Active Member

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    Here is the average temp by month for Sacramento. Definitely no need to grill block the top. I started to grill block here on Long Island at least 5 weeks ago ... but just the bottom.

    Average Weather for Sacramento, CA - Temperature and Precipitation
     
  5. jsfabb

    jsfabb Active Member

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    It may go a common chamber, but there are 2 distinct grills.
     
  6. there are many outside plastic grills feeding one common chamber! How the radiator is sub-devided is unknown. Presumedly into TWO sections: Engine and inverter cooling. Unless you happen to have more factual information.
     
  7. jsfabb

    jsfabb Active Member

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    What I meant by my remark is that there are two grills (top and bottom), not what you stated below:

    It's kinda like your nose and mouth both being connected to your lungs. They both serve different basic functions, but they are a back-up to each other for breathing.


     
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  8. bisco

    bisco cookie crumbler

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  9. Right, and once past the grand opening, also known as the mouth, and nose. You as an individual devoid of prior knowledge cannot know or guarantee where the product is traveling. Until you choke. Without manual diagrams, schematics, this is where we are.
     
  10. lensovet

    lensovet former BP Brigade 207

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  11. jsfabb

    jsfabb Active Member

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    But to my point there is a top (nose) and bottom (mouth) grill. Your statement (to be precise) was that there wasn't a top or bottom. That's all I'm debating.

    Besides, the airflow through each one can have a varying affect even though they may enter the same chamber. If you are cutting off the air supply from the bottom, it's going to change the volume of air.
     
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  12. lensovet

    lensovet former BP Brigade 207

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    Personally, I just want to see a schematic of someone choking through the nose at this point.
     
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  13. Yes I agree but, because of the Venturi effect, if you hinder flow of air at one place more speed and volume is effected at the other place. Please do me a favor and stick your eyeball down thru where the opening is at the mechanical hood latch. Under that point is a rather large chamber in which air flows. All one can do to lessen air flow is to block a section and then think of it in percentage terms. ie: 20 %, 40%, 60% etc. blocked. My
    original intent was to warn people NOT TO BLOCK 100%. One cannot block the lower gril and then say the inverter is blocked, we do not know that.
     
  14. john1701a

    john1701a Prius Guru

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    13°F on this morning's commute to work, taking the 70 mph route.

    I was caught a bit off guard when the engine fired up while driving at 55 mph in EV with the coolant at 143°F. My expectation was that not happening until it dropped below 130°F. Then it hit me that my request of "HI" as the temperature setting possibly being an influence. When the cycle repeated again later, the engine shut did indeed shut off when I adjusted it to "70" instead. Was that lucky timing or did I stumble across another influencing parameter?

    Anywho, the end result was 103 MPG with 0.3 mile of EV left after 16.7 total miles of travel.
     
  15. Zythryn

    Zythryn Senior Member

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    Very nice John. It is impressive the engine stays off as much as it does. Kudos to the engineers:)
    So 103mpg on a 16.7 mile trip is about 1/6 gallon of gas, and about 3.2 kwh used for propulsion (based on your all EV with .3 EV miles left)?

    I find it very interesting how the winter weather affects plug in vehicles. We are definitely feeling it as well:(
     
  16. retired4999

    retired4999 Prius driver since 2005

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    Good to know John, keep heat settings as low as possible, Thanks!
     
  17. lensovet

    lensovet former BP Brigade 207

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    oh i agree with that 100% :)
     
  18. john1701a

    john1701a Prius Guru

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    I'm consistently seeing less than 3.0 kWh per full recharge from the ChargePoint app.
     
  19. Have not noticed that John, but then again I only look at the range, which does consistently go lower, charge point or home outlet. It is very much of a pain to read the chargepoint meter, I shouldn't complain tho, it's FREE.
     
  20. john1701a

    john1701a Prius Guru

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    It looks like I made a discovery! Boldly going...

    This morning's commute appears to have revealed a coorelation between the heater setting and coolant threshold. They seem to be tied directly, the lower the temperature on the heater, the lower the temperature on the coolant.

    In other words, a setting of "HI" will trigger the engine to startup when it drops to about 145°F but "72" not until around 121°F. I tested theory this by adjusting it to "65" and observed the engine staying off until 114°F.

    The end result of my 16.7 mile commute (taking the 70 mph route) today was 137 MPG with 1.8 mile of EV remaining. I'm looking forward to seeing what the commute will reveal when the heater is set to "65" for the entire drive.
     
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