EV Mode

Discussion in 'Gen 4 Prius Accessories and Modifications' started by Kimoy, Aug 27, 2020.

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  1. Kimoy

    Kimoy Member

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    Is there a way to disable the limiter on the EV mode. I want to go EV for faster than 25mpg.

    I have a 2020 Prius AWDe
     
    #1 Kimoy, Aug 27, 2020
  2. alanclarkeau

    alanclarkeau Senior Member

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    What do you mean "faster than 25mpg"??

    EV Mode is totally automatically controlled by the microprocessors for maximum efficiency - but won't make you go any faster.
     
    #2 alanclarkeau, Aug 27, 2020
  3. Salamander_King

    Salamander_King Senior Member

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    I think the OP means "faster than 25 mph".
    And answer is NO, not on 2020 Prius AWDe. You would have to trade in your AWDe and get Prius Prime to be able to drive EV mode faster than 25 mph.
     
    #3 Salamander_King, Aug 27, 2020
    Last edited: Aug 27, 2020
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  4. jerrymildred

    jerrymildred Senior Member

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    There's a reason for the car not wanting you going fast. The battery doesn't store that much energy. It can shut off the engine under extremely light loads at higher speeds, but you pretty much need to be decelerating for that to happen.

    Basically, EV on the regular Prius is most useful for getting the car out of the garage so you can wash it. If you want to drive it like a Prime, you need to buy a Prime. If you NEED AWD and want EV mode driving, then the RAV4 Prime should be coming to your rescue sometime in the coming year.
     
    #4 jerrymildred, Aug 27, 2020
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  5. bisco

    bisco cookie crumbler

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    there is a way, but it's secret. are you ready to pony up for the premium priuschat membership?
     
    #5 bisco, Aug 27, 2020
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  6. sam spade 2

    sam spade 2 Senior Member

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    Consider yourself lucky.
    My C won't stay in "EV" above 5 MPH.
     
    #6 sam spade 2, Aug 27, 2020
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  7. Tideland Prius

    Tideland Prius Moderator of the North
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    No. But without EV mode, you can still travel up to 62mph with the engine off if you’re careful on the throttle.

    But in terms of normally driving around in EV mode, you’ll need a Prius Prime for that.
     
    #7 Tideland Prius, Aug 27, 2020
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  8. alanclarkeau

    alanclarkeau Senior Member

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    Yes, but only once the ICE has warmed up - otherwise the ICE comes on at 38km/hr.
     
    #8 alanclarkeau, Aug 27, 2020
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  9. Kimoy

    Kimoy Member

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    So what makes the prime go 80mph on EV mode
     
    #9 Kimoy, Aug 28, 2020
  10. CooCooCaChoo

    CooCooCaChoo Senior Member

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    ^^^ Programming. The Prime is technically the same as all other Priuses with the exception of a larger battery and programming.
     
    #10 CooCooCaChoo, Aug 28, 2020
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  11. jerrymildred

    jerrymildred Senior Member

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    The P610 transaxle for the Prime uses MG2 and MG1 for power in EV mode, which is made possible by a one-way sprague clutch between the engine and the transaxle. The regular Prius doesn't have that sprague clutch so MG1 can't spin that fast to allow that much speed. Go to about the one hour, 43 minute mark in this video to see a partial explanation.
     
    #11 jerrymildred, Aug 28, 2020
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  12. jerrymildred

    jerrymildred Senior Member

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    And the sprague clutch.
     
    #12 jerrymildred, Aug 28, 2020
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  13. alanclarkeau

    alanclarkeau Senior Member

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    Remember it's a HYBRID - not an Electric Vehicle. In other words, it's about as efficient as a Petrol powered car can be (at the moment) - using the small hybrid battery to optimise driving. Don't try to drive it as an EV - it isn't one, and pushing EV Mode doesn't help (unless you're hypermiling).

    Very different concept to PRIME. The PRIME battery is HUGE compared with a PRIUS. I think the PRIUS is about 0.8kWh (? can't see the exact figure), PRIME is 8.8, over 10 times bigger.
     
    #13 alanclarkeau, Aug 28, 2020
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  14. Tideland Prius

    Tideland Prius Moderator of the North
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    For future reference, the NiMH version is 1.31kWh and the Li-Ion version is 0.745kWh for the Gen 4 Prius.
     
    #14 Tideland Prius, Aug 29, 2020
    Last edited: Aug 29, 2020
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  15. jerrymildred

    jerrymildred Senior Member

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    I had no idea they were so different!! :eek:
     
    #15 jerrymildred, Aug 29, 2020
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  16. CooCooCaChoo

    CooCooCaChoo Senior Member

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    Yeah, this was done, IIRC, because the Li-ion battery can use a wider ranger of the battery SoC vs the range of the NiMH.
     
    #16 CooCooCaChoo, Aug 29, 2020
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  17. Tideland Prius

    Tideland Prius Moderator of the North
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    It also charges and discharges more easily than the NiMH; a bit disconcerting to seasoned Prius owners used to the operation of the NiMH of the Gen 2 and 3. It definitely allows more EV driving than previous generations and you can more easily recapture the energy back with regenerative braking.

    It saves about 5kg over the NiMH battery (could be 4, could be 6. There’s a typo in the spec sheet so it says 324.5kg lol. We don’t know if they meant to write 32.5 or 34.5kg)
     
    #17 Tideland Prius, Aug 29, 2020
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  18. jdenenberg

    jdenenberg EE Professor

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    My 2020 Prius AWD-e has the NiMh battery, not the LiOn. The good news is that I already know how to maintain a NiMh traction battery (I had one in my 2004 Prius).

    JeffD
     
    #18 jdenenberg, Aug 30, 2020
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  19. Raytheeagle

    Raytheeagle Senior Member

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    What color did you get for your new Gen4?
     
    #19 Raytheeagle, Aug 30, 2020
  20. jdenenberg

    jdenenberg EE Professor

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    As in my signature red of course.

    JeffD
     
    #20 jdenenberg, Aug 30, 2020
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