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Exclusive first Model 3 Dyno

Discussion in 'Model 3' started by Mysterylectric, Feb 22, 2018.

  1. AUSinator

    AUSinator Member

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    #61 AUSinator, Feb 23, 2018
    Last edited: Feb 23, 2018
    2018 BMW M3 5 door specs auto :
    Power 317kW @ 7300rpm
    Torque 550Nm @ 1850-5500rpm
    Kerb Weight (kg) 1560
    Acceleration 0-100km/h (s) 4.1

    Tesla Model 3 Specs:
    Power 293kW
    Torque ?
    Kerb Weight (kg) 1730
    Acceleration 0-100km/h (s) 4.8 which is 0-60m/h in 4.6s (dragTimes )

    So the Tesla has 23 less kw's, weighs 170kg more and is 0.6sec slower than the BMW M3.

    Comparing these starts: The BMW has very high torque at a wide range of revs. compared to most ICE cars. Even though the BMW has amazing stats this just confirms even more the Tesla dyno result of 393hp would be about right because there is no way the Tesla could achieve 4.6secs 0- 60m/h with its kerb weight/ . For it to achieve 4.6secs on the claimed 250hp just doesn't make sense!! You would need massive torque and then you would have alot of wheel spin specially with its tyres it has fitted!!!!

    (Also note unlike the Tesla it is very difficult to achieve the BMW claimed 4.1 secs 0-100km/h you need launch on, close to empty tank, proper tyre pressure, perfect weather and lots of attempts etc). As proven many times in reviews the Germans are very optimistic when it comes to acceleration times and fuel consumption stats.

    I think Tesla are underselling because of the model X and S and also because of the trouble they had in the past with false performance stats.

    We also don't know yet what is the power loss at lower charge and cold battery? This would be interesting to know.

    In all WOW!!!!! when you consider your getting a longer range electric power train, super charge net work nation wide with those performance stats the Model3 is great value for $50000 and it puts it in a class of its own for now. Just add a HUB and its almost perfect :)
     
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  2. scottm

    scottm Version 9 software sufferer

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    I have a traction control OFF button on my console, they didn't give you that on a P85?
     
  3. SageBrush

    SageBrush 2020: Drain the Sewer

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    How about just noting the speed at the peak Wh/mile
     
  4. Daniel in SD

    Daniel in SD Well-Known Member

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    How do you explain that most dyno results for the Model S P85 come out lower than 400hp yet it's a 1000lbs heavier and much faster both 0-60 and 1/4 mile?
    BTW 1/4 mile trap speed is considered a much better indication of HP than 0-60 because it is not as dependent on wheel spin and shift speed.
     
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  5. AUSinator

    AUSinator Member

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    The Model S P85 is 917ibs heavier and has 23hp more compared to the Model3 dyno stats.
    Several owners are claiming the model3 feels as fast as there modelS p85.
    Maybe the S P85 has more torque and better torque range? who knows? it does have a different type of electric motor.

    You are correct that the 1/4 mile is a better indication of HP for ICE cars. However its not a fair HP indication comparing ICE to electric drive train this is because at higher speeds electric drive train is much slower with just 1 forward gear compared with the ICE multi forward gears. Also the electric drive train revs so much higher than ICE. its not comparing apples with apples!!!
     
  6. fiksegts

    fiksegts Active Member

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    P85 is much faster than the Model 3.....


     
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  7. fiksegts

    fiksegts Active Member

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    #67 fiksegts, Feb 23, 2018
    Last edited: Feb 23, 2018
    where are you getting this 293kW? the car shows it's making a max of 252kW, we tested via powertools...



     
  8. Daniel in SD

    Daniel in SD Well-Known Member

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    But does it feel faster? j/k
    Anyway the numbers just don't add up.
    Car and driver measures 45-65mph time at 2.1seconds. Let's calculate the average horsepower to accelerate 3800lbs from 45mph to 65mph in 2.1 seconds:
    Wolfram|Alpha: Making the world’s knowledge computable
    The answer is 242 hp. Actual wheel horsepower is a little higher due to wind resistance (~10 hp).
     
  9. Gforce1

    Gforce1 Member

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    Nice! Glad to donate my car to the cause!
     
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  10. fiksegts

    fiksegts Active Member

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  11. Daniel in SD

    Daniel in SD Well-Known Member

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    So, they got 281hp to the wheels.
    I'm not sure what they're talking about on torque though. It puts down way more than 552 ft-lbs to the wheels. It accelerates at 0.6G (from 0-40mph) which is 2,280 lbs of force (3800lbs*0.6). 2,280lbs * 13.2" radius of tire/12" = 2,508 ft-lbs
     
  12. McRat

    McRat Well-Known Member

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    Torque measured before the reduction gear perhaps?
     
  13. johnny04

    johnny04 Member

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    Sorry for asking a stupid question, but what is that noise we hear? Is that the noise of the electric motor? It's loud and sounds horrible.
     
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  14. JRP3

    JRP3 Hyperactive Member

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    Were the wheels slipping on the last dyno run?
     
  15. JRP3

    JRP3 Hyperactive Member

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    Or corrected for the gearing to get motor torque.
     
  16. Daniel in SD

    Daniel in SD Well-Known Member

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    They said at the wheels and they didn't disassemble the car so I don't know. Model 3 reduction gear is 9:1. 2508/9 = 279lb-ft. Specced torque is 307lb-ft so seems pretty close.
     
  17. Mysterylectric

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    Heres our calibration run max power. This held consistent on all 30mph runs, but the 10mph runs showed 390hp. I'm wondering if the car has a secret built in. With manual calculations, I am getting 545ft/lbs to the rear wheels, which is in line with the dragtimes video. We are going to be setting up another test, but on the street this time. If we can duplicate this on the street, it'll be definitive (ABS disconnected, and a few "warm up pulls").
     

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  18. McRat

    McRat Well-Known Member

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    Yes, torque is a calculation.

    If I select a different transmission gear to do my pulls in, the torque stays about the same as long as load is not a factor such as with turbocharged engines. I put a sensor on the engine to determine engine RPM, then the software calculates out the torque based on the gain of mph per second and mass of the roller(s) and whatever eddy current retard you load into it.
     
  19. Daniel in SD

    Daniel in SD Well-Known Member

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    A Model 3 with 545ft-lbs of torque at the motor and no traction control should do some sick burnouts! Looking forward to it :D
     
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  20. JRP3

    JRP3 Hyperactive Member

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    Using this calculator which does not take into account wind or rolling resistance I get 137kW/184hp for a 1741kg/3837lb 0-96.9km/h(60mph) in 4.6 seconds.
     

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