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  1. Z

    Max power at high speeds

    Evidenceless claims can be dismissed without evidence.
  2. Z

    Max power at high speeds

    You forgot to show some actual evidence. Probably? You forgot to show some actual evidence, again. Show me some actual evidence and I will believe you. Tesla P100D: 0 to 100 MPH (about 161 KPH) in 6.0 seconds. The 2017 Tesla Model S P100D and the 0-100-0 Test - Motor Trend Also, the 60 MPH to...
  3. Z

    Max power at high speeds

    Claims made without evidence can also be dismissed without evidence. Asking me to find evidence to support your claim is typical of obscurantists everywhere. Adding a smiley face to a counterfactual claim does not magically reduce the counterfactual content. Show where a stock Kia out...
  4. Z

    Max power at high speeds

    Correct, and that is true of all magnetic (wound coil) motors. The only potential advantage to a permanent magnet motor is slightly higher efficiency since the permanent magnets do not require any energy to operate. Three phase induction motors are asynchronous while three phase permanent magnet...
  5. Z

    Max power at high speeds

    That is correct. As the RPM increases the back EMP increases proportionally and that reduces the voltage across the motor's windings, thus reducing the possible output power. As the RPM increases that causes the back EMF to approach the battery voltage and when the back EMF and battery voltage...
  6. Z

    Max power at high speeds

    Obvious BS is obvious. Show some actual evidence.
  7. Z

    Home made jack pad for Model S

    Why would anyone want an ionized surface? That would just make it more reactive and the ionization would not last long at all.
  8. Z

    Horsepower & torque specs?

    Perhaps you misunderstood the intent of my original statement: "... the torque and power for a P100D in Ludicrous Plus Mode are substantially higher than what that chart shows" The referenced chart lists the maximum battery power as being 461KW, which is low by over 100KW(!) for a fully...
  9. Z

    Towing an Airstream with the Model S 100D

    The Model S Owner's Manual clearly states that the Model S is not designed to tow anything. Of course the manufacturer's recommendations simply do not affect some people. On the other hand the Model X *is* certified for towing. From Page 160 in the Model S Owner's Manual: Towing a Trailer...
  10. Z

    P100D without Ludicrous

    Note that a Tesla Model S P100D without Ludicrous Mode is not really equivalent to the 100D since the former has two drive motors and inverters while the latter only has one of each. Hence, don't expect to achieve the same range with a P100D without Ludicrous Mode as a 100D.
  11. Z

    Horsepower & torque specs?

    The referenced chart above (View attachment 271707) is incorrect. It is showing data for Ludicrous mode mixed with acceleration times for Ludicrous Plus Mode. "... Tesla being able to pull 1500 amps from a battery pack for a P100D." Actually, in Ludicrous Plus Mode a P100D pulls about 1,750...
  12. Z

    Tesla Model S 22" rims

    So you never plan on driving up or down a hill or even turning around a street corner? What about freeway speeds and banked turns? If you keep the car in a garage or up on blocks and never drive it you would be just fine though.
  13. Z

    Mission E comparison

    KW is in units Power as correctly stated above, while KWH is actually Energy. Having X KWH of energy available says absolutely nothing about the maximum amount of power available. For example, you can use a very small electric motor to spin up a heavy flywheel and that would require X amount...
  14. Z

    Horsepower & torque specs?

    The torque at the wheels is actually in the thousands of pound-feet and their stated torque is unlikely to even be correct at the motor shafts. There is way too much botched in their measurements to take very seriously. Look at all of the failed attempts before they were able to get any...
  15. Z

    Founders Series Model S for Kids - for sale

    Is it in the original packaging and what is your asking price?
  16. Z

    Is This the Tesla Semi?

    Well, it is obviously someone's electric truck since there are no obvious radiator openings in the front or fuel tanks on the sides.
  17. Z

    One Tire With Slow Leak, replace 1 or all 4?

    Either repair the leaking tire or adjust the valves on the three non-leaking tires so that they leak at the same rate as the leaking tire. Either method will help keep your car level.
  18. Z

    Upgrade 60 to 75 via folks on ebay?

    Also note that this eBay "upgrade" may only change what is displayed to the user, without actually increasing the actual range.
  19. Z

    Top Gear Chris Harris Drives P100D vs Porsche 911R

    People need to learn to calm down about this. It is obvious that this testing was just the setup for Chris Harris' next irrelevant comparison of a Yugo against a 10 cubic yard dump truck. The fact that they decided to "compare" this current pair of vehicles demonstrates their total cluelessness.
  20. Z

    PMAC vs induction motor for model 3

    You cannot safely assume that and here is why. All AC induction motors induce voltages in the rotor "windings" (hence the name induction motor). The rotor is constructed with shunts (shorting bars) that conduct the current generated by the induced voltage in the shorting bars. The field must...
  21. Z

    First Try at Garage Summon

    The reason why the Tesla stops on a ridge or a sudden incline like that when using summon is that region requires more torque from the drive motor(s), which is essentially Indistinguishable from having run into a low laying object that the ultrasonic sensors did not detect ( imagine having...
  22. Z

    Driving Log: Austin -> Baton Rouge road trip; Harvey edition.

    I hope that you remembered to order your Tesla with the Oarlocks option.
  23. Z

    New Inventory P100D 0-60 Change - Now 2.7sec?

    Note that the 2.5 to 2.7 second difference could also be explained as the same difference between 0 to 60 MPH and 0 to 100 KPH.
  24. Z

    Can we watch solar eclipse through pano/all glass roof?

    "I am wondering if it is safe to watch the solar eclipse through the beautiful pano or all glass roof on Model S." The proper "sun glasses" for viewing an eclipse appear to be completely opaque when trying to view everyday things rather than looking sunward. In other words, the Tesla glass...
  25. Z

    Car settings werdification

    "... No software update notification last night. ..." I see at least two possibilities. 1. Do you have any children or neighbor children who might get into the car to have a look? 2. There may have been a system reset overnight, putting your settings back to some default state.
  26. Z

    Tesla with transmission will solve range and heating issues?

    What type of engineer are you? Do you operate a diesel locomotive? Or diesel engines aboard a ship? By mechanical engineering definitions a transmission has multiple gear ratios available (making "multi-gear transmission" redundant) while a gearbox has a fixed ratio. Since an ICE produces...
  27. Z

    Is car to car charging possible?

    Why stop there when you could have a Tesla Road Train.
  28. Z

    Tire Pressure display

    Read your Tesla User's Manual. The right hand scroll wheel on the steering wheel alters the right side of the driver's display and the left hand scroll wheel alters the left side of the driver's display.
  29. Z

    Regen and Brake Lights - Highway Issue

    So you want to attach a broken light to a broken pedal? Why?
  30. Z

    How long do brake pads last?

    "What I found on my front breaks was very ugly." If you had breaks in your front it is unsurprising that it would be ugly. Perhaps your meant "brakes" instead?
  31. Z

    Accelerator Pedal Broke Off

    The leftmost pedal is the brake pedal, while the rightmost pedal apparently can become the break pedal. I must admit that I am totally without any comprehension as to why anyone would push the rightmost pedal hard enough to break it. It is functionally like a sewing machine speed control pedal...
  32. Z

    WTB Tesla All Weather Mats

    I examined the Tesla floor mats and then ended up purchasing the below, which are better made and a *very* good fit in our near 2017 (last day of December 2016) Tesla Model S P100D. The edges curl up to contain water, etc. Amazon.com: 3D MAXpider L1TL00001509 Complete Set Custom Fit All-Weather...
  33. Z

    Poll: Do your power folding mirrors work properly?

    Mine does that occasionally, but I found that by command folding the mirrors and the unfolding them with the driver's door push button always resets that mirror to the correct position. It appears to be a software problem and I have not yet brought this up with the Tesla SC since they are not...
  34. Z

    Driving efficiency with windows or sunroof open?

    The referenced study was for an ICE, which commonly has about one third of the efficiency of an induction run electric motor. It was also published in 2004 with the test vehicles being a "full sized" sedan (4.6L V8 engine) and a "full sized" SUV (8.1L V8), with both being GM products, neither of...
  35. Z

    75D upgrade to P100D

    And the P100D does 0 to 60 in 2.4 seconds in Ludicrous+ mode.
  36. Z

    Only me or are other getting constant errors?

    Do a full reboot and if the problems persist, get to a Tesla Service center *REAL SOON* because you vehicle is royally messed up and it could leave you stranded or worse.
  37. Z

    Motor Trend H2H Tesla SP100D vs. Audi RS7

    "There aren't very many cars that can beat a P100D in the 0-60mph band." And in this test case the Tesla also beat the Audi by a full second in the quarter mile. The bad news is that they apparently did not use much in the way of instrumentation to validate the test runs.
  38. Z

    2 years: Musk's new timeline for door-to-door full autonomy

    AHA!! Just As We Thought! The AP2 car will have to travel So Slowly that it will take TWO YEARS to reach your destination! [/AngstRiddenPosterEmulationMode] ;)
  39. Z

    Weight of Frunk Liner?

    Instead of trying to drop 20 pounds or less from the vehicle weight, simply drive slower and your range will increase. Use the Tesla range estimator to see the benefits down to 45 MPH. The difference between 70MPH and 60MPH is about 20% more range and increasing to about 60% more range by...
  40. Z

    How much of a voltage drop is ok?

    Let's do some math. 242V minus 235V is a 7 volt drop with an 80 amp load, which indicates a series resistance of 0.0875 ohms. 7V / 242V represents slightly under a 3% voltage drop under full load (actual = 2.89%), while a 3% voltage drop under full load is considered to be an acceptable limit...
  41. Z

    We did it!!

    Unless your normal driving routes involve ramped curbs and no potholes, you likely should have selected the 19 inch wheels, since the 21 inch wheels are *extremely* easy to damage and quite costly to replace.
  42. Z

    Holy Wind Batman

    Sorry to take so long to respond to the above, I was busy and I see that this thread is now buried on the third page. Of course you are correct that the power efficiency has to drop to zero at zero RPM, since no work is being done then. The linear extrapolation merely shows that over the range...
  43. Z

    Holy Wind Batman

    Well, in a relatively small podunk community high school in Oregon over 50 years ago we had a couple of relatively competent science teachers who were eventually replaced with an idiotic and totally worthless creationist "science" teacher who was actively trying to convince the students that...
  44. Z

    Holy Wind Batman

    But the induction motor efficiency does not actually reach zero with your stated test conditions, it is a much larger number than that (infinitely larger in fact). As long at the motor is moving the power efficiency is definitely non-zero. I do not have any specific performance data for the...
  45. Z

    Very High Electric Bill

    There is an even cheaper solution available that monitors more than just the total KWH used - at least for those inclined to build things. I installed a $12 electronic measuring device that monitors the voltage, current, KW (kilowatts, power), KWH (kilowatt-hours, energy), and cumulative time...
  46. Z

    Does using the accelerator to hill-hold harm the motor?

    Close, but not quite correct. Most high power inverters (including Tesla) use IGBT (Insulated Gate Bipolar Transistors) which are not quite as fast as power FETs but are more efficient at high current levels, can handle far higher voltages, while also having a huge SOAs (Safe Operating Areas)...
  47. Z

    Holy Wind Batman

    Firstly, I originally left unstated the assumption that rolling resistance and gearbox losses remained constant with changes in speed, so that only drag was being considered significant for this discussion. Secondly, your above statement is *obviously* incorrect since Power = Torque * RPM...
  48. Z

    Holy Wind Batman

    Also note that the HP requirements increase with the cube of velocity. That also means that if you are fighting a 30 MPH headwind, slowing down by 30 MPH would get you back to your original expected range for travel on that route. Here's a handy chart showing the approximate range vs the speed...
  49. Z

    Does using the accelerator to hill-hold harm the motor?

    Are we even sure that the Tesla "Hill Hold Mode" uses the brakes to hold position? Since this could be done totally with the drive motors (which also matches the behavior that you have stated) I would suspect that the brakes are actually not being used at all. If the brakes were being used...
  50. Z

    Does using the accelerator to hill-hold harm the motor?

    You should have stopped right there and considered looking up what you did not know (hint, I have been designing with electric motors for decades). NO! In order for any current to be induced into the rotor it CANNOT stay in phase with the rotation of the stator field. When the slip is zero...