Non PP non digital dash gauge missing Diff Temp

Discussion in 'Mustang S550 General Forums' started by Allentown, Feb 12, 2019.

  1. Allentown

    Allentown Well-Known Member

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    Was reading about all the PP1 digital dash users missing oil temp display here
    https://www.mustang6g.com/forums/threads/missing-engine-oil-temp-gauge-on-2019.114940/page-2

    And it reminded me of a similar problem. Owners manual points out diff temp should be in the menu and it isn't ...however unlike the PP1 digital owners the oil temp is right there easy to find.

    Is it that the base GT auto with 3.15 gears has no sensor in the rear diff or is it a similar problem with it just being missing from the menu like the pp1 digital is missing oil temp?

    I assume I can just keep an eye on my trans temp gauge for a rough guess as to how hard the diffs being pushed?
     
  2. gixxersixxerman

    gixxersixxerman Well-Known Member

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    My understanding only the PP have diff temp sensors..
     
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  3. OP
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    Allentown

    Allentown Well-Known Member

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    #3 Allentown, Feb 12, 2019
    Last edited: Feb 12, 2019

    Do the torsen units heat up more than a standard LSD? I wondered if that was a factor.

    Also the 3.15s don't heat up like the 3.55s and 3.73 since they are always running several hundred fewer RPMs??

    It's odd though as the clutch packs should be more heat sensitive and this have a greater need for a sensor and limp mode....though they are much cheaper to replace .
     
  4. NorthernBeast

    NorthernBeast Well-Known Member

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    My PP1 digital dash isn't missing any of the gauges so I'm not sure what your answer is. Maybe that's just how it is on non PP1-PP2 cars
     
  5. OP
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    Allentown

    Allentown Well-Known Member

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    One has nothing to do a the other , it was only the fact that seeing the thread about the missing oil temp reminded me that I had been meaning to ask about the missing rear diff read out.
     
  6. Zathras

    Zathras Well-Known Member

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    Just as an additional data point, my May-built 2018, non-PP, with optional 3.55 ratio also does not have diff temp in the display. I guess it's for PP only cars (as suggested by other posters above).
     
  7. OP
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    Allentown

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    I am guessing the trans oil heats up in tandem with the rear diff anyway so if you watch the trans temp you can guesstimate when the rear diff is getting hot. I would also guesstimate that on an extremely curvey location the rear diff would tap out just bit sooner than the trans.
     
  8. tom_sprecher

    tom_sprecher Living Race Car Free

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    They all heat up if you track them, which is what the PP with a torsen is aimed at.
     
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    Allentown

    Allentown Well-Known Member

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    Understood. It is a more complex mechanism to improve traction over the LSD lok (as long as neither rear wheel gets in the air from hitting the bumpers with very tight springs) and I reasoned that increased complexity might also generate additional heat in the process of improving traction. Rather than having kinetic energy lost to potential bits of wheel spin the wheels are more planted. The law of conservation of energy suggests that energy has to go SOMEWHERE and therefore...heat energy could be getting amplified.

    I am no engineer though and would assume that heat energy would be divided between the tires, diff and other drive train components.
     
  10. tom_sprecher

    tom_sprecher Living Race Car Free

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    Most of the heat in a diff is produced by the ring and pinion. Those a gears use a hypoid mesh that has a large contact patch and a sliding action of the gear surfaces. This creates a lot of heat requiring special lubricants. The high torque loads seen while racing or tracking a car will only exacerbate the situation.

    The amount of heat contributed by any LSD is small relatively speaking. I would like to see an side by side test, but I would think a clutch style LSD would run hotter that an torsen due to the clutch plates sliding against each other. They wear out for a reason.
     
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