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Won't coast on battery

Discussion in 'Gen 3 Prius Technical Discussion' started by Toddwilks, Sep 1, 2014.

  1. Toddwilks

    Toddwilks Active Member

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    AC off cruise on windows closed driver side cracked open
     
  2. Former Member 68813

    Former Member 68813 Senior Member

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    When you said "still on flat surface" (0:44), you are going slightly uphill. See the noise panels uneven alignment.
    When you said "it won't coast" I don't think anyone assumed you were going hwy speeds in hilly environment.
     
    #42 Former Member 68813, Sep 4, 2014
    Last edited: Sep 5, 2014
  3. bisco

    bisco cookie crumbler

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    when you take the test drives, make sure both cars are completely warmed up. set the trip meter, take the same route and compare mpg's. is this the dealer you bought the car from?
     
  4. Toddwilks

    Toddwilks Active Member

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    Yes it is.
     
  5. bisco

    bisco cookie crumbler

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    well, they should make it right, whatever it takes. did you get your '09 from them as well? dealers shouldn't be selling cars and washing their hands of them.
     
  6. Toddwilks

    Toddwilks Active Member

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    No I bought my 09 at a BMW dealer down the block used. The 09 gen II has 57,000 miles and the 10 has 59,000.

    I just left and they found that when they did the recall work, they never calibrated the electric generator and charging system. They did that and said that should fix it.

    I drove my normal route today to work again 64mph cruise on AC off and driver window open and it increased 1.3mpg so maybe they did fix it. I will see if it goes up again on the way hope. 50+ here I come!!
     
  7. bisco

    bisco cookie crumbler

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    that's interesting stuff, considering the thread, 'just had my inverter recall done and lost 8 mpg'. all the best!(y)
     
    #47 bisco, Sep 5, 2014
    Last edited: Sep 20, 2014
  8. JimN

    JimN Let the games begin!

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    Your Gen2 experience works against you. The concepts are still the same but the application is different. Tires need to be at max sidewall pressure for best fuel economy.

    It sounds like you have soft tires that are not LRR. LRR make a world of difference. On OEM tires my 2010 would accelerate down mountains. On the replacements it decelerates on some.

    46.4mpg indicated is low. I'd expect high 40's actual, say 52-53mpg indicated.
     
  9. Toddwilks

    Toddwilks Active Member

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    Both cars are running OEM tired. I know the gen ii is at max. I'll have to check the gen iii
     
  10. Spooled

    Spooled Member

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    I am having a very similar problem car feels like im dragging an anchor
    tires are at 51 psi

    have you checked the alignment? the wheel not being straight is catching
     
  11. Jerry Liebler

    Jerry Liebler Member

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    Your symptoms sound like you have a transmission that has been damaged by running low on fluid.
    ThiDs myay sound
     
  12. Toddwilks

    Toddwilks Active Member

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    Problem fixed. Called corporate and opened a complaint. Went to dealership 3 times for the problem and threatened to open a lemon law claim. After speaking with the regional rep and multiple test drives in my car and others, they deemed it a lemon. Car is gone and I should have my money back in two weeks. I'll stick to my gen II. Less advanced but seems more reliable. Thanks everyone.
     
  13. JC91006

    JC91006 Senior Member

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    The lemon law applies to a used car? I think they were just tired of you going there LOL. I'll bet tomorrow that car is on their lot again, all shiny and ready for the next sucker.....I mean owner.
     
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  14. Toddwilks

    Toddwilks Active Member

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    Yes it does since I bought it from a dealer.
     
  15. JC91006

    JC91006 Senior Member

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    I think your problem was the brake pressure accumulator recall. It was probably not done right. Anyways, that car is long gone.
     
  16. GregP507

    GregP507 Senior Member

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    Coasting was once called, (in less politically-correct days) "Mexican cruise-control." I agree, it gives the illusion of getting something-for-nothing, and in the case of a conventional car, it can save a bit of fuel due to the elimination of engine-braking, which is really just converting your forward speed to engine-drag.

    The Prius is designed to reclaim much of that energy through regeneration. This is observable as apparent light-braking (In the Gen III at least) when you let off the accelerator pedal. I find that this drag is desirable when descending moderate hills, as it keeps the car from speeding up to too much in most cases, and it also provides some stored energy for the traction battery.

    Coasting in neutral with a Prius makes no sense for several reasons. Firstly, there's nothing gained; the fuel economy won't go up, because the regeneration opportunity is lost, and because coasting doesn't eliminate any potential engine-drag, because there is none. Secondly, there is no actual "neutral" in the Prius drive-train. The engine is permanently connected to the wheels, with no means to disengage it; there is no clutch, no torque-converter or any other way to disconnect them. For the car to appear to be coasting in neutral, the electric traction motor must run in reverse, in direct proportion to the difference in speed between the wheels and the gasoline engine. So, if the gas engine is stopped, and the vehicle is "coasting" at 30 mph, the electric motor must run in reverse at the exact speed required to keep the gas engine stopped. If the gas engine is running, the speed of the electric motor changes to compensate. It's just simple computer-programming; to give the illusion of the "N" position on the shift-lever of a conventional car.
     
  17. vskid3

    vskid3 Active Member

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    Except that coasting is more efficient than regen. If you need to slow down, regen is much better than friction brakes. Regen is not more efficient than coasting with the kinetic energy of the car, even considering the energy required for the transmission to coast.
     
  18. GregP507

    GregP507 Senior Member

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    You're saying it, but I'm just not believing it.
     
  19. vskid3

    vskid3 Active Member

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    Look up the articles about getting insane mileage in a Prius (or really any car, just most don't have regen as an option). The most efficient way to drive is pulse and glide with 100% coasting. Not steady speed, not pulse and regen. Regen adds more energy conversions, with each building on the inefficiencies of the last. Regen is only useful for when you would otherwise be using the brakes.
     
  20. macman408

    macman408 Electron Guidance Counselor

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    The laws of thermodynamics don't need you to believe in them, they'll be true either way.
     
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