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New 85D, air suspension on 19" seems stiff

Discussion in 'Model S: Driving Dynamics' started by jmsurpri, Mar 4, 2016.

  1. jmsurpri

    jmsurpri Member

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    Took delivery of my 85D yesterday. One of the first things I noticed is the suspension seems really stiff. Before I ordered, I test drove a P90D with 21" and air, and I was surprised how smooth it felt. I went with the 19" and air hoping for an even smoother ride, but it feels much stiffer than the P90D I test drove. Does it take some time for the suspension components to mellow out?
     
  2. llavalle

    llavalle Member

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    I can attest that my 85D, on air and on 19in is pretty stiff. I know that the tires on 21in equipped car are usually inflated to 45psi. On my 85D, the recommended pressure is 50psi. 5psi makes a huge difference...
     
  3. SabrToothSqrl

    SabrToothSqrl Active Member

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    The 19s should require a lower PSI, as they have more space for air...
     
  4. sorka

    sorka Active Member

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    50 psi for 19s. 45 psi for 21s.

    That said I run 45 in my 19's and it makes no difference. My P85D air on 19s is the stiffest MS I've ever driven. The P85D on 21s I test drove in last year in February was far more compliant as was the P85+ loaner I had.

    I'm about to put factory 21's on today with the OEM Continental tires to see if it makes a difference because the service center told me the all season rubber was the real cause of it being harsher and stiffer and that if I'd gotten 21s with summer tires that it would be like what I experienced on the test drive. I think that's complete BS but I called their bluff and I'm about to find out.

    Also my sway bars are larger in diameter than any P85D produced before March 2015 or after. They still have yet to tell me if the part actually changed in part number or measure an in stock replacement to see if it's the same as mine.
     
  5. Drucifer

    Drucifer Active Member

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    I run 45 PSI on my 19s and 21s as well. 45 is plenty firm for efficiency, but leaves some room for sidewall flex and improved ride.
     
  6. tstafford

    tstafford Member

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    FWIW - Tesla inflated my 19s to 45 last week.
    pressure.JPG
     
  7. llavalle

    llavalle Member

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    Yeah, my invoice said the same multiple time. Check the pressure, pretty sure they are at 50. This is an invoicing issue.
     
  8. Fanatic1

    Fanatic1 Member

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    My tire rotation visit also said 45PSI for my standard 19s on my 85D.
     
  9. jdw

    jdw Member

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    #9 jdw, Mar 4, 2016
    Last edited: Mar 4, 2016
    I remember back in April or so, Tesla changed the placards in some 85D's with 19" from 45 to 50PSI, confusing everyone. By May they had gone back to listing 45PSI - there were a few threads about this, but the short of it is that Tesla confirmed several times that the correct pressure for the 85D with 19's was 45PSI. The consensus opinion was that 45 or 50 were both OK, with the higher pressure recommended for fully loaded high speed driving and the lower pressure recommended for regular driving.

    P85D 19 tire pressure recommendation is now 50psi - Page 5
     
  10. sorka

    sorka Active Member

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    Mine was just in and they raised the pressure to 50 psi and noted it on the invoice. Prior to that, they lowered it to 45 months ago *before* they changed the recommendation. This was the Fremont SC, so go figure. I lowered them back to 45.
     
  11. Tdriver

    Tdriver Member

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    I have an 85D on 19's with air suspension at 45 psi. The ride is anything but firm, softer than my Lexus LS460.
     
  12. jmsurpri

    jmsurpri Member

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    Checked my tires tonight and they were at 50psi. Dropped them down to 45 and now the ride feels a bit smoother. The placard on the door says 45 as well. Thanks everyone for the help!
     
  13. chriSharek

    chriSharek Member

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    You took delivery yesterday and your only comment here was about the suspension being stiff!? No pictures, no excitement, no WOWs? :)
     
  14. jmsurpri

    jmsurpri Member

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    Haha pics and wows will follow soon! Too busy driving!! :smile:
     
  15. msnow

    msnow Active Member

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    45 PSI, w/air suspension 90D, drives feels perfect. Not too stiff, not soft. P90D with 21's very stiff.
     
  16. sorka

    sorka Active Member

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    Just took first good long drive with new 21s. It's just a little bit stiffer and harsher than the 19s were which is to say it's like riding a go cart without any suspension at all. I'd love it to be as soft and compliant as the P85+ loaner I had. That car had awesome street suspension. My P85D would be great if I tracking it....that is until it pulled back power after the first lap.
     
  17. mobe

    mobe Member

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    Have you tried changing from insane to regular or comfort mode?
     
  18. sorka

    sorka Active Member

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    Not sure I understand the question. The only setting that has the word comfort in it is the power steering assist setting and this would have no effect on suspension.

    Just to clarify for anyone else wondering, there is nothing adjustable on the air suspension except for the inflation pressure. The higher the pressure, the higher the car rides and the faster the spring rate. The slowest spring rate i.e. the softest ride, occurs at the lowest ride height which has the lowest amount of pressure in the air springs.

    The damping rate is fixed and not adjustable unlike every other sport sedan on the planet in this price category.
     
  19. michaelwb

    michaelwb Member

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    Last Saturday, I test drove a 90D with air suspension and 19" wheels and was also surprised by the stiff ride quality.

    Compared to our Volt and E-Class, you definitely notice more road imperfections at low speeds. On the upside, body control is excellent and you feel much more connected to the road compared to those two cars. I just didn't expect that, as I assumed Model S had a bias towards comfort, particularly with air suspension and 19" wheels.

    On another note, it was cool how in test drive mode you can select 70, 70D, 90, or 90D performance. I assumed 90D used smaller, less powerful rear motors than a 70, but apparently not.

    - - - Updated - - -

    Perhaps the stiffness I experienced was attributable to how high the suspension was set. The person at the store set it to "high" on a few instances. But it lowers to "normal" ride height at speed?
     
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  20. llavalle

    llavalle Member

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    The non-P Dual motor all have the new, small unit. The RWD 70 and 90(not sure if this is still available) use the older, bigger motor. What you tried is a simulation of the power of the car.
     
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