TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

Interesting Observation with TACC

Discussion in 'Model S: Driving Dynamics' started by Alex Van Ness, Jul 31, 2016.

  1. Alex Van Ness

    Alex Van Ness Member

    Joined:
    May 18, 2016
    Messages:
    14
    Location:
    Richmond, VA
    My wife and I were driving on the Skyline Drive in Virginia and I noticed something very interesting with TACC. The Skyline Drive is a relatively windy mountain top road with a speed limit of 35mph in the Shenandoah National Park. I set TACC to 40mph and as we went around sharp curves, the TACC would slow the car down to the proper speed to go around the curve just before it entered the turn (usually to 30-35mph). At first, I though it was a mistake with TACC, but it happened around every curve where 40mph would have been a little too fast. Has anyone else experienced this? Does anyone know if TACC has always done this? Does it use GPS to judge the proper speed for the upcoming curve? I'm just curious about it so any info would be great.
     
  2. gavine

    gavine Petrol Head turned EV Enthusiast

    Joined:
    Apr 1, 2014
    Messages:
    1,008
    Location:
    Southern New Jersey
    Does your car have Autopilot?
     
  3. Todd Burch

    Todd Burch Electron Pilot

    Joined:
    Nov 3, 2009
    Messages:
    4,733
    Location:
    Smithfield, VA
    It's been doing it for awhile, and most speculate that it is indeed GPS combined with mapping to determine upcoming curves.
     
    • Like x 1
  4. S4WRXTTCS

    S4WRXTTCS Active Member

    Joined:
    May 3, 2015
    Messages:
    1,177
    Location:
    Snohomish, WA
    My understanding is it didn't used to do it when the feature was first released. But, then it was added to it during some 7.X version.

    Some people love the feature, and other people wish they could turn it off.

    Personally I'd prefer to turn it of, but I haven't had any bad experiences with it. I do use the throttle to bring it back up to a proper corning speed (10 over the speed limit). I don't want to drive like an old grandma through the corner.
     
    • Like x 1
  5. Alex Van Ness

    Alex Van Ness Member

    Joined:
    May 18, 2016
    Messages:
    14
    Location:
    Richmond, VA
    Yes it does. It's a late 2015 S85D.
     
  6. Todd Burch

    Todd Burch Electron Pilot

    Joined:
    Nov 3, 2009
    Messages:
    4,733
    Location:
    Smithfield, VA
    I wouldn't say it's as slow as grandma, but certainly it's slower than a typical human would take the curve.

    But on the other hand, it's probably as fast as you'd want to let autopilot take the curve in its current iteration.
     
  7. DillyBop

    DillyBop Member

    Joined:
    Sep 24, 2015
    Messages:
    119
    Location:
    Middleburg, VA
    I noticed the same thing on the same highway a couple months ago!

    I was impressed with its performance. very smooth and didn't slow down TOO much.
     
    • Like x 1
  8. rhumbliner

    rhumbliner Member

    Joined:
    Sep 24, 2015
    Messages:
    118
    Location:
    Las.Vegas Jackson.Hole
    I recently tested the TACC on the Pacific Coast Highway and my experience has been roughly the same. It might be my imagination but I think it did a better job of slowing thru the curve when the big, yellow > > > signs bracket the curve.

    I have AP but don't trust it on curvy, 2-lane roads with heavy traffic. Too often it would exhibit the "lurch" toward oncoming traffic that a few others here have reported.
     
  9. Alex Van Ness

    Alex Van Ness Member

    Joined:
    May 18, 2016
    Messages:
    14
    Location:
    Richmond, VA
    I completely agree. I did not have auto pilot on. I tried it for about 2 minutes and realized it could not handle the curvy road.
     

Share This Page