Delay between reverse and forward?

Discussion in 'Cooper SE' started by Smart Wannabe, Jan 12, 2022.

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  1. insightman

    insightman Well-Known Member Subscriber

    Wow! 130.3 mph in reverse! Who's going to test if the SE is limited to 93.2 mph (150 km/h) in reverse? The SE's shorter wheelbase will require more driving skill to keep it going in a straight line. Thanks, @Carsten Haase
     
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  3. Urbanengineer

    Urbanengineer Active Member

    I would think this is a design intent by BMW to give the car that “feeling you are used to” switching from rev to drive. Many other electric cars are harsh when switching reverse to drive. The mini’s smoothness [in pedal control] is a large reason why we bought it.
     
  4. chrunck

    chrunck Well-Known Member

    Ha, I have been wondering whether the SE could go just as fast in reverse. But I'm not brave enough to try.
     
  5. The drive motor is a 3 phase AC motor it has no polarity
     
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  6. insightman

    insightman Well-Known Member Subscriber

    If the behavior was consistent, I might agree with you. However, sometimes I get forward power immediately after shifting and sometimes I don't. Consistent behavior is the feeling I'm used to.
     
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  8. Urbanengineer

    Urbanengineer Active Member

    Are you touching the brake? When I breathe on the brake pedal it’s aggressive af.
     
  9. insightman

    insightman Well-Known Member Subscriber

    No, I just shift from reverse to drive. Sometimes it's af, sometimes it's just f.
     
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  10. Urbanengineer

    Urbanengineer Active Member

    Lol, I meant while transitioning r to F touching break. I routinely get the same feel not touching brake. I’ll go test here later.
     
  11. Godfrey

    Godfrey Member

    This happens to me when I back down my driveway and onto the street downhill so that I need to go uphill after putting in Drive. I've found that quickly pumping the brake pedal three times before shifting out of Reverse makes the car move when I press the accelerator after shifting into Drive. Still a delay because it takes a little bit of time to pump the brake pedal three times, but it seems like less delay than just waiting for the car to decide to move if I don't pump the brake pedal.
     
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  13. CoachCookie

    CoachCookie Active Member

    That sounds like quite a nuisance. I sure hope that isn't normal behavior for these cars :/
     
  14. insightman

    insightman Well-Known Member Subscriber

    Unfortunately, it's not only frequent, but inconsistent and potentially dangerous. Sometimes I shift from reverse to forward and take off immediately, while other times, I have to hit the brakes to avoid coasting backwards into something.
     
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  15. GvilleGuy

    GvilleGuy Well-Known Member

    Weird that it happens to some and not others. I've never experienced this problem.
     
  16. Puppethead

    Puppethead Well-Known Member

    As I've mentioned before, neither have I. Maybe it's a driving technique issue?
     
  17. insightman

    insightman Well-Known Member Subscriber

    What technique do you use to shift from Reverse to Drive? I just yank on the shift lever. Do you always use the brakes to come to a complete stop before shifting?
     
  18. Godfrey

    Godfrey Member

    In my experience, it happens after I reverse downhill a few car lengths and then put it into Drive to go uphill. If I reverse out of a parking space in a parking lot, it doesn't happen. I don't know much about physics and so maybe I'm using the wrong term, but I've thought of it as having to do with change in momentum.
     
  19. Carsten Haase

    Carsten Haase Well-Known Member

    I think you may be on to something there. I haven't had this issue but do generally come to a stop (or close to a stop) with the friction brakes before trying to drive forward.

    Because the car regens in reverse too, i'm guessing the car needs to come to a complete stop before it'll actually switch modes into drive (even though it says drive).
     
  20. SpeedyRS

    SpeedyRS Well-Known Member

    I’ve not experienced this issue either. I generally only go from D to R or vice versa when I’m stationary and I’ve usually use the friction brakes to stop when manoeuvring.
     
  21. chrunck

    chrunck Well-Known Member

    I've experienced it occasionally if I don't come to a complete stop, usually when I've backed out of a parking space.
     
  22. Puppethead

    Puppethead Well-Known Member

    I never think about it, but I'm pretty sure I always touch the brake out of habit when I want to change directions. Probably due to driving manual transmission most of my life, it's how you avoid damaging the gears.
     
  23. carrrl

    carrrl Active Member

    Experience this all the time as I back down a flat driveway out onto a hill (happens even on flats.) Just have to account for it or brake pedal, even in high regen. Every EV I've had does this differently. In my 500e it made a terrible sound unless you were dead on 0mph in and around changing gears. In my Bolt it gradually transitioned with minimal rollback, with no hesitation if you floored it. It by far had the most intuitive pedal control of the bunch.
     
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