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Optimized alignment results (happy)

Discussion in 'Model S: Driving Dynamics' started by zwede, May 24, 2014.

  1. zwede

    zwede 2013 P85+

    Joined:
    Jan 17, 2014
    Messages:
    501
    Location:
    Plano, TX
    I chronicled my quest for the most energy efficient alignment settings here: Results of testing front toe-in vs energy usage

    Today I went for a 30 mile drive. The car is a P85+ on the factory 21" tires, so energy usage tends to be higher than cars with 19's.

    I did nothing to minimize energy usage. AC was on the whole time, ambient temp 28C/82F. I did 70-75 mph on the highway for 15 miles, and then 15 miles in town where I followed the general flow of traffic and stopped at a few lights. Again, no attempts at hypermiling whatsoever.

    I was a bit surprised (and pleased) to see 255 Wh/mile at the end of the 30 miles.

    20140524_115957_zps69205ca9.jpg
     
  2. slipdrive

    slipdrive Member

    Joined:
    Aug 30, 2013
    Messages:
    196
    Location:
    Colorado
    Got it from the Service Center a few hours ago, and apparently the car already had the camber bolts from factory delivery Aug 2013. So the camber was already around -1.2. BUT the left rear was toe out .40 (!), while right was -2 and was no doubt the cause of the early demise of a pair of Goodyear 19's. No idea how that may have happened, but it was a fact. Now both rears are properly at -0.21 toe in. Already I felt the difference on the drive home, and bit more "float and hunt" on the freeway. Steering on Sport setting is good. I'll be paying much closing attention to alignment...
     
  3. EarlyAdopter

    EarlyAdopter Active Member

    Joined:
    Jun 24, 2012
    Messages:
    2,499
    Location:
    Redmond, WA
    Zwede, what were your final alignment settings and what sort of Wh/mile would you have seen along that route before?
     
  4. zwede

    zwede 2013 P85+

    Joined:
    Jan 17, 2014
    Messages:
    501
    Location:
    Plano, TX
    Toe is what impacts efficiency, and I ended up at 0.25 dgr toe-in at the rear and 0 toe front.

    Hard to say exactly how much more energy it used before I started as weather has such a large impact and it has gotten warmer. I think I can confidently say I've gained 15%, and that's conservative. But my as-delivered alignment was off at 0.8 dgr toe-out in the rear (way out of spec).
     

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