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ECO Mode in fair weather

Discussion in 'Prius c Technical Discussion' started by RocMills, Oct 8, 2012.

  1. RocMills

    RocMills Active Member

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    If I understand what I have read about ECO mode (push button, ECO Mode light comes on), all it really does is change the sensitivity/resistance of the gas pedal and reduce output of fan (a/c or heater). It doesn't do anything else, right?

    If that is the case, is there any point at all in running in ECO mode if you are not going to be using the heating or air conditioning?
     
  2. bisco

    bisco cookie crumbler

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    only if it helps you accellerate slower, thus increasing your mpg's. some find they do better in regular and even power mode.
     
  3. RocMills

    RocMills Active Member

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    Thanks, Bisco. The C does not have a "power" mode... only ECO mode (button), EV mode (button or proper use of pedals), and "normal" with neither of those buttons activated. You can get into a power "zone" if you depress the accelerator too strongly - but there is no Power Mode on the C.

    As for accelerating slowly, nope, I don't need any help with that. I will make sure to turn the ECO mode off next time I get in the car. Thanks again!
     
  4. Corwyn

    Corwyn Energy Curmudgeon

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    Eco mode makes it easier to get into some glide states, which will reduce your gas consumption. If you aren't having trouble with that, Eco only helps with the AC and heat (not necessarily just the fan though).
     
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  5. RocMills

    RocMills Active Member

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    When I want to glide, I just shift into neutral. I wasn't very good at engaging glide to start with even though I've driven with Eco Mode engaged since I bought the car. I think it's hard for me to get into a "natural" glide because we have so few level roads in this town. At best, I could manage 5-10 seconds of natural glide, whereas when I shift to neutral I can actually go a couple of miles without losing speed.
     
  6. F8L

    F8L Protecting Habitat & AG Lands

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    Just make sure the engine is off before going into neutral or else it will stay on. Don't shift into neutral at a speed below 42mph then allow the car to accelerate above 42mph. :)
     
  7. RocMills

    RocMills Active Member

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    F8L,

    When I reach the desired speed and am in the right location, I take my foot off the gas, wait a second, engage neutral. I discovered last week that if one tries to shift into neutral with the accelerator depressed, the car goes insane with beeps and warning lights... at least mine did, nearly gave me a heart attack! LOL

    Was also pleased to discover (I was having a bad day, not feeling at all well) that if one accidentally shifts the car into reverse while traveling down the road... absolutely nothing happens. When I saw what I had done (looked down at the shift lever), I just about wet myself and fully expected the car to explode. It did nothing, absolutely nothing. I quickly shifted back into D and for the rest of the driving I did that day, I just pretended I was back in my Echo to ensure I didn't make any more foolish mistakes. Would love to know if this is standard behavior for this sort of engine, but on the other hand it isn't something I want to experiment with!
     
  8. Corwyn

    Corwyn Energy Curmudgeon

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    It is. First, the engineers at Toyota worked hard to make it so you couldn't blow up the car. Most controls on Prius are commands to a computer, not direct linkages to anything actually moving. Second, if you look at would happen (see: Toyota Prius - Power Split Device ) if it actually succeeded, it wouldn't hurt the car. Switching to reverse doesn't mesh any gears the wrong way, it just tells the car to apply an (alternating) field to the motor to get it to turn in the other direction, this means that at most, it would slow the car and then have it reverse. Sudden changes just don't work. Unsafe on a highway obviously, but no risk to the car.
     
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  9. Revan86

    Revan86 Animal nerd and alt car guy

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    From what i gathered over my relative short time owning Boom and being on Prius Chat, it seems that gliding in the C is much harder that the Gen2 Prius and EVEN then Gen3. I use the peddle to glide on short p&g style glides. Then I tend to shift to N on longer glides like when using coming up to red lights a ways off.
     
  10. Rob.au

    Rob.au Active Member

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    Everything I write below is purely my view from driving the car and reading PriusChat and a few other pages. I feel that until the day I buy a ScanGuage, this is all pure theory and I don't really know.

    I've not spent much time in the Energy Monitor screen, but it seems in the C there's almost no tolerance for the car to be able to display "no arrows" while moving. I think this is more than just most C drivers being Prius newbies. This said, it appears that a commonly accepted substitute for "no arrows" on the Energy Monitor is "no reading" on the HSI. I personally don't find this difficult to pull off and in fact it surprises me these days how easily I can do it. In any case, in my view "a slither of green" on the HSI isn't the end of the world should it occur and this is much more informative than the Energy Monitor.

    I do tend to stay in ECO Mode - but this just means the relevant pedal position is x, when for Normal mode the relevant pedal position would be y. This said, ECO Mode is going to allow you to more easily make finer adjustments around point x, so does provide some advantage in making it easier to get close to the right spot.

    For me, the known downsides from using N are enough for me to not use it - and most importantly to me, at all times I want to know that if for some reason I need to get out of the glide, this can be done with nothing more than a flick of the ankle.
     
  11. Mr Incredible

    Mr Incredible Chance favors the prepared mind.

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    It is my observation that the ECO mode changes the programming and allows easier entrance to glides, longer use of glide, and turns the squelch way down on the gas pedal. Once you adapt to the difference, it can be your friend.

    Of course, it also turns the squelch way down on the heating and cooling.
     
  12. RocMills

    RocMills Active Member

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    Not a matter of me adapting to Eco Mode as it's pretty much the only thing I've used since I got the car. If it isn't doing anything more than I first described, though, there's really no point in me using it during fair weather.