Torsen Limited slip diff

Discussion in 'Modding' started by kermit, May 19, 2016.

  1. kermit

    kermit Registered

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    hello,

    I was wondering if anyone can help me simulate a torsen LSD or something that gives similar function.

    im a bit lost for values. can someone explain the below values and how they work?

    DiffPowerRange=(1.0 , 0.05 , 1 )
    DiffPowerSetting=1
    DiffCoastRange=(1.0 , 0.05 , 1 )
    DiffCoastSetting=1
    DiffPreloadRange=(170 , 1.0 , 1 )
    DiffPreloadSetting=1

    basically i think the only way to achieve this is to create a diff that is 100% locked ?
    Cheers
    Daniel
     
  2. Lazza

    Lazza Registered

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    From the skip barber in devmode:

    DiffPumpTorque=170 // at 100% pump diff setting, the torque redirected per wheelspeed difference in radians/sec (roughly 1.2kph)
    DiffPumpRange=(0.004,0.00,1) // differential acting on all driven wheels
    DiffPumpSetting=0
    DiffPowerRange=(0.0048,0.10,1) // fraction of power-side input torque transferred through diff
    DiffPowerSetting=0 // differential power setting
    DiffCoastRange=(0.0048,0.10,1) // fraction of coast-side input torque transferred through diff
    DiffCoastSetting=0 // differential coast setting
    DiffPreloadRange=(3.8, 1, 1) // preload torque that must be overcome to have wheelspeed difference
    DiffPreloadSetting=0 // preload setting
    RearSplitRange=(1.00, 0.10, 1) // Torque split to the rear, defaults to
    RearSplitSetting=0 // 50:50 if these entries aren't here.

    Range= values are (<start value>, <step>, <number of values>). So (0.20, 0.05, 5) gives possible values of 0.20, 0.25, 0.30, 0.35, 0.40. (5 possible values). The first value is Setting=0, the last setting is (<number of values> - 1)
     
  3. Lazza

    Lazza Registered

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  4. kermit

    kermit Registered

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    Thankyou for the reply. So the values I have entered seems correct in a sense If I want a 100% locked diff. Up to 170N/m of torque.

    I guess its the only way of simulating some kind of LSD.
    I did see the thread you mentioned and hope something had changed. My understanding of the torsen style LSD is that the diff is unlocked until the torque becomes different at a certain amount on the opposite wheel and the difference with just having a completely locked diff would be handling characteristics of understeer and and so forth.
     
  5. Lazza

    Lazza Registered

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    Don't know much about diffs myself, but it sounds like you want the opposite of preload, which I assume rF2 can't do.
     
  6. ucfquattroguy

    ucfquattroguy Registered

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    Don't think it can be modeled in rF2. The .hdv only provides means of setting up static preload and locking forces with respect to *wheelspeed* difference.

    To simulate a Torsen, you would need the sim to be aware of the torque being applied to each driven wheel and stop applying locking force when the difference in torque exceeds a torque bias ratio specified in the .hdv (if supported). A torsen does not have status preload. If you jacked up your car, you could freely spin the wheel lifted off the ground.
     
  7. kermit

    kermit Registered

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    Thanks for the replies guys, there does not seem to be anyway to simulate this by the looks of it or even fudge something similar.
     

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