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Super Highway Mode

Discussion in 'Gen 2 Prius Main Forum' started by Jolly, Mar 3, 2014.

  1. Jolly

    Jolly Junior Member

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    I've been using this technique for a while now and I have a question. I'm sorry if it's been addressed already 'cause I know I've seen it here before. Anyway, I'm driving to work today -got my rpms at 1280 or so and timing at 14. Then I hear the engine go up in rpms, similar to a regular transmission when you punch it and it backshifts to a lower gear. I know it's done this before but today is the first time I actually heard it. I was getting great mpg and then it dropped way down. I never changed my position on the accelerator. Can anyone explain to me what is going on at that point?
     
    #1 Jolly, Mar 3, 2014
  2. HaroldW

    HaroldW Active Member

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    There must be more than 14 degrees maybe 14-17? Once you fall out of SHAM you loose the advantage. That is what you are noticing.With a honda hybrid the range for SHAM is 30- 37 degrees. I have not had a prius long enough to no the range for the prius.:) H
     
    #2 HaroldW, Mar 3, 2014
  3. Jolly

    Jolly Junior Member

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    If you're talking temperature it was 3 above 0 when I drove to work.
     
    #3 Jolly, Mar 3, 2014
  4. fuzzy1

    fuzzy1 Senior Member

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    It is more touchy and less useful on our GenIII Prii than it is on GenIIs and Honda Hybrids.

    No, he is talking about angle degrees on the ignition timing.
     
    #4 fuzzy1, Mar 3, 2014
  5. Jolly

    Jolly Junior Member

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    Yeah, I kind of figured that out later. Sometimes I have senior moments.

    I guess my question is why did it do that? I never changed position on the accelerator pedal. It just jumped from 14 degrees to 21 or so all on its own.
     
    #5 Jolly, Mar 3, 2014
  6. edthefox5

    edthefox5 Senior Member

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    Because its freezing out and engine runs to heat the cat. Grill block the car.

    What is the ICE coolant temp when its doing this?
     
    #6 edthefox5, Mar 6, 2014
  7. Jolly

    Jolly Junior Member

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    I can't honestly say. But I was about five minutes into my trip but it was terribly cold. I use an EBH but even then it takes awhile. I'm gonna guestimate about 140 degrees F.
     
    #7 Jolly, Mar 8, 2014
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