Observation while passing

Discussion in 'Prius v Technical Discussion' started by Aaron Vitolins, Sep 30, 2016.

  1. Aaron Vitolins

    Aaron Vitolins Senior Member

    Joined:
    Feb 28, 2014
    1,611
    1,133
    0
    Location:
    Franklin TN
    Vehicle:
    Other Hybrid
    Model:
    N/A
    First of all, yes I have the v wagon and not the liftback.. I know! Same powertrain, this is the more popping section of the forum though!

    So today I passed a car on a country road, wide open throttle from 42 MPH to about 65 MPH (in PWR mode of couse!) the thing I noticed was after I was passed the other car and I started letting up on the accelerator, I felt an even stronger surge of power. Like it was actually faster for a little bit as i let off the accelerator! I believe my 2012 liftback did something similar.

    Why is this? Is this because the engine makes peak tourqe around 4200 rpm? (That's what I think i heard once) forgive if I'm wrong!

    I would think with HSD you wouldn't necessarily feel the affects of the torque curve. I know for a fact gen 2 never did anything like this.

    Educate me! Thanks, you Guys and Gals on PC are the best!

    -Aaron
     
    Whiteyprius likes this.
  2. AzWxGuy

    AzWxGuy Weather Guy

    Joined:
    May 22, 2011
    842
    412
    0
    Location:
    Tucson, AZ
    Vehicle:
    2021 Prius
    Model:
    Limited
    I'll take a guess. That's all it is though. If this were a carbureted engine I would suspect a vacuum leak or a loose or worn spindle on the carburetor throttle plate(s). I guess the real question is, was there actual acceleration or was this just perception. Flat terrain on your country road? Grabbing at straws here.
     
  3. Aaron Vitolins

    Aaron Vitolins Senior Member

    Joined:
    Feb 28, 2014
    1,611
    1,133
    0
    Location:
    Franklin TN
    Vehicle:
    Other Hybrid
    Model:
    N/A
    It was flat, maybe a little uphill actually. But yeah it honestly feel ever so slightly like a carbureted engine
     
  4. WolfpackBill

    WolfpackBill Active Member

    Joined:
    Mar 28, 2014
    337
    489
    6
    Location:
    Lexington, NC
    Vehicle:
    2010 Prius
    Model:
    IV
    I think that's the CVT talking. It s a characteristic of a CVT where there's a second delay in response when you push the gas pedal and there's also a second delay when you let off the gas pedal. I've noticed that when I test drove a Subaru Outback with a CVT a while back.
     
  5. Aaron Vitolins

    Aaron Vitolins Senior Member

    Joined:
    Feb 28, 2014
    1,611
    1,133
    0
    Location:
    Franklin TN
    Vehicle:
    Other Hybrid
    Model:
    N/A
    No because I was holding it down for a good 7 seconds while passing. And the Prius doesn't have a CVT like other cars. No belts, cones or pulleys. It's A Ecvt
     
    Redpoint5 likes this.
  6. glutaman

    glutaman Member

    Joined:
    Sep 18, 2016
    73
    26
    0
    Location:
    Dublin, Ireland
    Vehicle:
    2010 Prius
    Model:
    N/A
    The eCVT works by combining ICE, MG1, and MG2 spins - awesome representation here: http://eahart.com/prius/psd

    Off the top of my head now - if you lifted your foot enough to turn the ICE off, the MGs would have to change their spin speeds to regulate the change and that could have caused the power surge.

    In another situation that I've noticed in my car, there's a small loss of power when the ICE is kicking-in but it's power is only marginally needed. I guess the MGs are playing around a bit to find the sweet spot :)
     
    #6 glutaman, Oct 11, 2016
    Last edited: Oct 12, 2016
    Emad likes this.
  7. Redpoint5

    Redpoint5 Senior Member

    Joined:
    Aug 31, 2013
    1,024
    501
    0
    Location:
    Portland, OR
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    I'll take this opportunity to remind everyone that power mode doesn't affect wide open power. You can pass just as quickly in eco mode as power when mashing the throttle.

    Power mode simply makes throttle response more aggressive at partial throttle positions.
     
    broncobilly_69 and Mendel Leisk like this.
  8. bat4255

    bat4255 2017 Prius v #2 and 2008 Gen II #2

    Joined:
    Nov 8, 2007
    628
    238
    0
    Location:
    Dodge Co. Wisconsin
    Vehicle:
    2016 Prius v wagon
    Model:
    Two
    I have a Burgman 650 motorcycle/scooter, it to has a CVT and yes, it does the same thing. After a while you anticipate for it, and I look forward to it.
     
  9. Tiffany Melendez

    Tiffany Melendez New Member

    Joined:
    Jun 20, 2017
    5
    1
    0
    Location:
    US
    Vehicle:
    2012 Prius+ MPV
    Model:
    Two
    Good observation.
     
Loading...