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Improved Regen Braking

Discussion in 'Model 3' started by DBeckwith, Oct 25, 2018.

  1. DBeckwith

    DBeckwith Member

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  2. TurboCJ

    TurboCJ Member

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    Good news. Wish they would add an aggressive option for one pedal driving!
     
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  3. chronopc

    chronopc Active Member

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  4. ConcordeSST

    ConcordeSST Supporting Member

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    #4 ConcordeSST, Oct 25, 2018
    Last edited: Oct 25, 2018
    It would all depend on the type of driving you are doing. It definitely won't hurt efficiency, but if you're mostly doing long-distance highway cruising, it won't make much difference.
     
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  5. SigNC

    SigNC Active Member

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    Quite the opposite. The stronger regen will allow you to in theory stop later and still regen as if you had started slowing earlier when it did not allow such a high regen. It will not however really increase your range unless you were previously poor at slowing almost exclusively with regen. Highway driving of course it will have essentially zero impact.
     
  6. SigNC

    SigNC Active Member

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    Side note: I saw reduced regen at 85% charge on a P3 last weekend so I'm curious as to when reduced regen will start if they are turning it up some.
     
  7. seattlite2004

    seattlite2004 Active Member

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    The true one pedal drivers will feather the accelerator which changes regen forces down to a complete stop...no additional accel required if done right.
     
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  8. chronopc

    chronopc Active Member

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    I'm getting better at that with the 3. :)
     
  9. Swampgator

    Swampgator Active Member

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    True. This does take a little practice. Lifting gently for longer puts more energy into the battery than lifting completely later.
     
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  10. ModelNforNerd

    ModelNforNerd Active Member

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    As someone in New England, who is about to experience both colder weather, AND change commutes to now include about 15 miles of stop-and-go.....I approve this OTA update.
     
  11. ronm2948

    ronm2948 Member

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    The more that you use regen, the worse mileage that you will get. Regen is better than braking, but transfering energy from the battery to the kinetic energy of the car, and then trying to recover that energy through regen is a very lossy process.

    Now if you are doing a lot of hard braking, improved regen might recover a bit more energy and give you a bit more mileage. But I wouldn’t expect a huge improvement.
     
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  12. SteveG3

    SteveG3 Supporting Member

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    Makes sense... but occurred to me now, I see considerable variability in efficiency when going 75. This might be mostly be due to wind, but another contributor could be elevation change. Not necessarily something you’d notice as a meaningful change in elevation between the start & end point... but many small rises and falls over 100s of miles of driving with minimal net change in elevation. I think this is why on one 100 mile stretch of highway I’ve driven several times I get about 300 wh/mile, while another big leg I’ve done quite a few times I get about 250 (same climate control etc).

    I get that for much highway cruising, roads might be quite flat. However, it would be a nice plus if it turns out the cruising where I’ve had the most noticeable drop in range gets some help with stronger regen.
     
  13. Glamisduner

    Glamisduner Active Member

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    Wouldn't cruising with stronger regen make things worse?

    Regen adds efficiency when you have to stop, but it is not as efficient as coasting in neutral to slow a just a little. the less regen and braking you have to use on your commute the more efficient you will be. Of course regen is always better than using the brakes alone. Of course it's not practical to cruise down a hill at 90mph either hah.
     
  14. SteveG3

    SteveG3 Supporting Member

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    Can only speak for myself, but, during the long distance highway cruising I use AP most of the time, so, with ACC running, neutral doesn't enter the equation for me. So, will be interesting to see if stronger regen that's on the way adds up to anything meaningful in improved efficiency on hilly stretches like I described.

    I can give neutral on hills a try as well (don't even know how to do that yet).
     
  15. Zoomit

    Zoomit Active Member

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    Stronger regrn would only be more efficient if you are otherwise forced to use friction brakes. For typical cruising, stronger regen would have no effect. For driving with frequent stops, again where the friction brake would otherwise be used, then the stronger regen will likely yield a very minor improvement.
     
  16. surfrasch

    surfrasch Member

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    Don’t have my 3 yet and still learning, but does the regen extend the life of your brakes considerably?
     
  17. TT97

    TT97 Active Member

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    Absolutely. For every instance your car is using regen, it is one less instance you are using brakes. Also, when using brakes, you are using less brakes as the load is shared by the regen.
     
  18. Zoomit

    Zoomit Active Member

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    Yes, under normal usage the pads and rotors can last “the life of the car”. Still need to swap brake fluid every few years as its hygroscopic.

    What’s also great, is that the brake dust is very low so it’s easier to keep the wheels clean.
     
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  19. Shizzrock

    Shizzrock Member

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    I think it will make the most difference in stop and go traffic.
     
  20. MacGreiner

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    Right. Rusting is more of an issue than wear.
     

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