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P85D 0 to 60 time WOW (but what about charge levels)?

Discussion in 'Model S' started by SDRick, Jun 25, 2015.

  1. SDRick

    SDRick Member

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    Yesterday, I had the pleasure of providing many first timers their first Tesla grin. We all know how impressive the 0 to 60 times are, but I noticed a slight decrease in the acceleration sensation throughout the day. I believe the sensation reduction for me was twofold. First I was getting used to it a little bit, but more importantly I'm sure the 0 to 60 times will decrease along with the battery charge level.


    My question is has anyone published 0 to 60 times delineated at 5% or 10% increments of charge level? For example, at 50% charge, what would the 0 to 60 time be?
     
  2. gordo

    gordo Member

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    Don't know about 0-60 times, but sorka has informally published his peak kW numbers at several levels of charge in another thread, which should give you some idea of how acceleration is likely to drop off as SOC declines...

     
  3. sorka

    sorka Active Member

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    My vbox just arrived yesterday. I'll be repeating 0-60 times at those SOC levels along with the rwhp calcs from the vbox performance tools.

    I'm pretty sure that I was able to get somewhere around 3.6 at the 60% SOC.
     
  4. dhanson865

    dhanson865 Active Member

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    Ironically the Nissan Leaf tests to less than 1% variation in peak power no matter the charge level. Apparently the limiting factor there is the electric motor not the battery pack.
     
  5. stopcrazypp

    stopcrazypp Well-Known Member

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    Yeah, the motor outputs so little power that even at the lowest SOC there is enough output to handle it.
     
  6. sorka

    sorka Active Member

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    ....which is why there's less variation in the 85D and even less in the 85 where the limiting factor is the motor until you get down to 20 or 30% and then even on the 85 you'll start to see a reduction. On the P85D it starts declining from 100%.
     
  7. SDRick

    SDRick Member

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    This will be very interesting information once we see your results posted. Curious minds want to know.


    3.6 seconds at 60% is very respectable and a good estimate from my limited seat-of-the-pants experience.
     
  8. dhanson865

    dhanson865 Active Member

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    Well its a 80 kW (110 hp) electric motor with a 24 kWH battery and the S85D has 422 HP with a 85 kWh battery. Obviously kWh is the wrong metric to compare.

    Apparently the Leaf battery pack has no issue with providing 80 kW at low SOC to give the full 110 hp.

    If the P85D had the same HP to kW required ratio as the Leaf it'd need 502 kw to have full power. I think its safe to say the motors in the Model S lineup are more efficient but do we have a spec to know the kW required for each motor?

    and how much of a drop off is acceptable to the average user between 100% and 20% SOC?

    It'll be interesting to see Sorka's numbers when he is done testing. I hope he tests 100%, 50%, and 20% SOC in addition to the upper ranges he is going to do testing in.

    - - - Updated - - -

    and I wonder if there is a measurable difference on the S60 or S70D?
     
  9. strider

    strider Active Member

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    Or the AC/DC inverter.
     
  10. 70Dan

    70Dan VP of R&D at ConstructBuy

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    I'm also curious to see test results on the S70D.
     
  11. stopcrazypp

    stopcrazypp Well-Known Member

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    I think you did the math wrong somewhere. 80kW/24kWh is 3.33C. sorka measured 413kW at 90% and 366kW at 60%. That's 4.86C and 4.31C respectively. Obviously Tesla is pushing the battery a lot harder than the Leaf is (Leaf is equivalent to outputting 283kW if you scale by pack size 24kWh vs 85kWh).
     
  12. dhanson865

    dhanson865 Active Member

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    #12 dhanson865, Jun 26, 2015
    Last edited: Jun 26, 2015
    Nope, we are in agreement that the Tesla battery is doing more work. Keep in mind that with no active cooling of the battery pack Nissan probably can't afford to let the motor pull more than 80 KW for fear of thermal buildup in the battery pack. Tesla has better thermal management with active cooling of the battery pack so they can push things harder.

    Either the KW required by the leaf motor is less than the battery is capable of and/or the inverter isn't capable of doing more than 80 KW on the Leaf. Either way the 80 KW required by the leaf motor is less than what the battery could do if they upgraded one or more of those parts to give the battery a bit more of a workout and assuming heat isn't an issue.

    Maybe we'll learn more when Nissan reveals the 2016 specs with the 30 kWh battery.

    For now Nissan tells us exactly the input required by the electric motor in KW, the HP output by that motor if it receives that many KW. Check 2015 Nissan LEAF® Electric Car Specs or wikipedia if you prefer not to deal with the UI of the Nissan website.

    Tesla is only telling us the HP output and leaving us to do measurements to reverse the math and try to figure out the KW required for full performance. Or at least if they are telling us the KW required for the motors it isn't on the sales or marketing pages. If you have access to that data please share and then we can do the rest of the math.
     
  13. stopcrazypp

    stopcrazypp Well-Known Member

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    #13 stopcrazypp, Jun 26, 2015
    Last edited: Jun 27, 2015
    I must be missing something because the 80kW and 107hp number is just a standard unit conversion. Motor input/output doesn't even come into it.
    https://www.google.com/?gws_rd=ssl#q=80kw+to+hp

    My previous comment is mainly referring to the 502kW number. I'm not sure where you got that.
     
  14. dhanson865

    dhanson865 Active Member

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    that was math in the form of

    if a/b = x/y and we know a, b, and x then y must be...

    I just said if the HP to KW ratio for a Tesla required the same number of KW that a Leaf does then we can use that ratio from the advertised HP on the teslamotors.com web page to know the required KW.

    You seem to think that it's a fixed ratio from HP to KW so if that is the case we have Teslas word on HP per motor.

    S70D 389 HP
    S85 362 HP
    S85D 422 HP
    P85D 221 + 470 = 691 HP

    so if you say I can just google convert we get

    P85D 515.278611 kilowatts
    S85D 314.685346 kilowatts
    S85 269.943354 kilowatts
    S70D 290.07725 kilowatts

    the reason my number didn't match that before is because the Leafs motor is listed as 110 HP in some references and 107 in others. Using both figures with 80 KW gives a wrong conversion factor if there isn't supposed to be any other variables in the math.

    So anyway if you really think it takes 515 KW for full HP on a P85D and sorka only got 413 KW on a 90% SOC there is a lot of performance left on the table with that deficit on motor input power.
     
  15. SDRick

    SDRick Member

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    Sorka,

    Any luck on the SOC vs 0-60 tests?
     

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