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G-force for various Model S's?

Discussion in 'Model S' started by ozweepay, Aug 14, 2015.

  1. ozweepay

    ozweepay Member

    Jul 16, 2015
    Boulder, CO, USA
    I've seen claims that the P85D pulls 1.2 G's in max (aka insane mode) acceleration. Wondering what all models pull, at max? Including the 60, 70, 85, P85, P85+, 85D, P85D, 90, 90D, P90D. Is there a way to calculate this?

    Also, is the g-force consistent from 0-60? I don't think so, right? Because according to Acceleration | Unit Converter Calculator pulling 1 g means you have a 0-60 of 2.74s. So it must be that the 1.2 G's for a P85D occur at some interval in the acceleration but not through all of it.
  2. vitaliy

    vitaliy Member

    Jun 17, 2015
    Tysons, VA
    I'm also interested in this data.
  3. JER

    JER Member

    Apr 25, 2015
    Bristol, UK
    That is correct. Acceleration transitions from traction-limited to power-limited at a critical speed; this is true of any car. From what I've gathered, this happens somewhere in the 30-35 mph range in the P85D. Independent tests have observed around 1.0g prior to transition.

    AWD Model S variants get very close to perfect use of available grip when traction limited; acceleration here is determined by the tyre's μ value and should be very similar. Tesla could perhaps increase acceleration by allowing the traction control a more aggressive slip ratio target (at the cost of tyre wear), but I've heard no suggestion of this other than Elon's promise of "faster than falling" with Ludicrous Mode.

    The different power outputs change the transition speed and subsequent tail-off curve. This will be the primary cause of the different 0-60 times in the AWD models. Mass differences due to different batteries, drive units and options also have an influence.

    Obviously, the RWD models must have a handicap in the traction-limited phase. Not 50% as you might think from the weight distribution though; the torque reaction causes a weight transfer to the rear axle. I'd guess around a 30% handicap given the low CG and long wheelbase. Transition speed is higher though and only total horsepower matters in the power-limited phase.

    The P90D's Ludicrous Mode upgrade increases the speed at which the transition occurs - much closer to 60mph according to Elon in the recent earnings call. I predict somewhere around 45mph based on the numbers Tesla have published, but we'll only know for sure when someone gets some test gear in one.
  4. sorka

    sorka Active Member

    Feb 28, 2015
    Merced, CA
    About 1.05 gs P85D 90% SOC 19" wheels. Using my vbox.


    Consumer reports 1.02 gs.


    G's decline starting around 20 MPH. Elon was clear that the L mode would improve 30-60 but by 30 mph g's are already down to 0.95 and falling like a rock, so I don't think the will improve the peak but it sure will improve the width of that hump by quit a lot.

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