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Odd noise around 110-115kms/hr under light load

Discussion in 'Model S: Driving Dynamics' started by 808 24 7, Apr 14, 2017.

  1. 808 24 7

    808 24 7 Member

    Joined:
    Feb 24, 2017
    Messages:
    12
    Location:
    Toronto
    2015 S 85D with around 21,000 kms.

    Noticed a slightly annoying noise coming at around 110 to 115 kms/hr (around 68 - 72 mph), only when accelerator slightly pressed, so under a light load. It's almost as if a rear window was slightly open, but it's not anything wind - as soon as I step on or release the accelerator, the sound goes away.

    It also doesn't happen at other speeds. It's like a deep rumbling noise. It's not the typical milling noise that I've been reading about.

    Service center says they can barely hear it, but will keep a lookout for any tech posts about it as they don't know what might be causing it.

    Anyone else experience something like this?
     
  2. jmsurpri

    jmsurpri Member

    Joined:
    Feb 5, 2016
    Messages:
    348
    Location:
    Beaverton, OR
    I've found that there is a noticeable increase in motor whine at exactly 67mph. Above or below that it disappears. I think it's just a resonant frequency.
     

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