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Range data from removing Aero Wheel Covers

Discussion in 'Model 3' started by Ferdball, Apr 19, 2018.

  1. Ferdball

    Ferdball Member

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    TL DR; 16.7% increase in Wh/mile with aero wheel covers off.

    ML ND; 54 mile drive: 4 miles of surface streets, 50 miles freeway. Freeway speed was between 75 and 85. Similar driving style.
     

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  2. dhrivnak

    dhrivnak Active Member

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    That is huge as that translates to a 17% difference in range.
     
  3. McFlurri

    McFlurri Active Member

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    Wait... the aero wheels are LESS efficient??? How does that make sense?
     
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  4. ggies07

    ggies07 Supporting Member

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    yeah, we have an interview (can't remember who....one of the head designers, engineers) that said it adds like 10%.........
     
  5. dhrivnak

    dhrivnak Active Member

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    #5 dhrivnak, Apr 19, 2018
    Last edited: Apr 19, 2018
    No with covers off he used MORE watts/mile.
     
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  6. McFlurri

    McFlurri Active Member

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    Ooohhh.. i read that wrong lol.

    Ok.. makes complete sense now
     
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  7. cella

    cella Member

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    More Wh/mile means it's less efficient with the Aero covers OFF. That's how I interpret the first posting anyway. ;)
     
  8. Moderatefan

    Moderatefan Member

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    Something is not right here. We had someone do the comparison before and it was around 5% difference on 18 inch rims if covers were off.
    If you go from 18 inch to 19 inch, that's another 5% (worse for 19)
     
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  9. novox77

    novox77 1.21 Gigawatts

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    It could be right. 75-85mph is quite fast. aero drag goes up exponentially with speed.
     
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  10. jsmay311

    jsmay311 Member

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    Seems way too high to me. More details are in order.

    Highway speeds were 75-85 mph? What does that mean exactly? Were the speeds identical on both runs out not?

    Were the two runs done right after each other to ensure similar temps and winds?

    Did each run stop/start at the same location to minimize effects from changes in elevation and wind direction?

    Was climate control turned off?

    Etc. Etc. Etc.

    (Also, what is ML ND?)
     
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  11. DR61

    DR61 Member

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    Agree, a 53 mile test with no controls for variables and no replication is a problem.
     
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  12. PoitNarf

    PoitNarf My dog's breath smells like dog food

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    What we need to do is have two Model 3 owners get together and do this test at the same time. Drive the exact same route at the same time at the same speeds, one with Aeros on and one with them off.
     
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  13. buttershrimp

    buttershrimp Click my signature to Go Mad Max Mode

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    Gotta do the same road with similar weather conditions.... also, same bladder liquid status to account for weight difference. Science demands nothing less.
     
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  14. Ferdball

    Ferdball Member

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    More Long, Need Details.
     
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  15. Ferdball

    Ferdball Member

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    My experience is my experience, obviously. Your mileage may vary.

    That being said, I have driven the same route to work for 16 days. Each time was a consistent 240 ish Wh/m. Again, it’s not scientific, but I feel it’s a consistent data point.

    I’ve only driven once without the covers, but that is a significant change. Also, I did not hoondog it and Otto was my pilot.
     
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  16. T34ME

    T34ME Active Member

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    Those numbers came from Tesla. I believe they measure efficiency at either 60 or 65 mph. The OP measured at 70/75 mph.
     
  17. SageBrush

    SageBrush 2020: Drain the Sewer

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    This caught my eye too. Unless OP adds more detail to convince me otherwise it sounds like the test runs had too much variation to give a valid comparison.

    That said, 244 Wh/mile at 75-85 mph is tremendous.
     
  18. SoCalGuy

    SoCalGuy Active Member

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    I drove 200 miles in a recent M3 build with mostly highway driving (prob 80%) and got 227 wh/mile on the 18s without the aero caps on a sunny day with temps in the high 50s/low 60s. Highway speeds generally between 60-70 mph since speed limit in tri state around 55 mph.
     
  19. insaneoctane

    insaneoctane Active Member

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    Not controlled enough testing for me. I don't think that the ugly plastic discs increase the efficiency that much ..
     
  20. run-the-joules

    run-the-joules Active Member

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    Both using autopilot, then switching who leads and coming back the other direction. Repeat 5-7 times.
     
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