Temperature and limp mode question, may be silly

Discussion in 'Drivetrain, Exhaust and Electrical' started by 2012Boss302, Oct 6, 2018.

  1. 2012Boss302

    2012Boss302 TMO Addict

    Messages:
    693
    Likes Received:
    90
    Joined:
    Aug 29, 2012
    Location:
    Sugar Land, TX.
    I've seen S550's at the track enter limp mode because of excess temperature, either oil, coolant, or both. I've also read post here about S550 limp mode.

    I have never experienced it or heard of S197's doing this. I personally have seen 260-270*F oil temp measured at the pan and 220+* F coolant temp using OBD data. No I am not concerned with my temps.

    Is this limp mode phenomenon a S550 exclusive problem???
     
  2. steveespo

    steveespo Lord knows I'm a Voodoo Child Moderator

    Messages:
    3,381
    Likes Received:
    607
    Joined:
    Mar 6, 2011
    Location:
    NY Metro
    S197 will go limp mode at about 237 degrees Cylinder head temp. There are also subtle reduced power modes along the way, timing reduction and fuel enrichment. I believe tuners can modify these values in custom tunes.


    Sent from my iPhone using Tapatalk
     
    Eric62 and 2012Boss302 like this.
  3. Grant 302

    Grant 302 OPM Spent: $587,402 Moderator

    Messages:
    6,242
    Likes Received:
    1,378
    Joined:
    Nov 23, 2011
    Location:
    In the OC
    I think the S550s have more sensors than the S197s in general, and Ford made use of the ability to go into limp mode if any of those monitored temps go too high. There were lots of examples when the first base 350s hit the track.
     

Share This Page