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Thread: [Magic inside!] Need Help With Differentials

  1. #11
    Moderator Bealdor's Avatar
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    Quote Originally Posted by Roger Prynne View Post
    Another quality post from Jussi, I don't know how you do it mate.
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  2. #12
    Kart Driver
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    So, Power Ramp with 90deg means spool, when accelerating?
    And, 0deg in Coast Ramp means both wheels turn independently?

    To give more grip when accelerating out of corners, set Power Ramp to e.g. 60deg?
    To stabilise the car when going off-throttle, set Coast Ramp to e.g. 30deg?

    Or is it reversed, not 60/30 but 30/60?

  3. #13
    WMD Member Ramjet's Avatar
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    Great read and also that old educational movie is Gold, they just don't make them like that anymore ... makes it simple to understand by compare. cheers Jussi and OperatorWay !
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  4. #14
    Handling QA Lead Jussi Karjalainen's Avatar
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    Quote Originally Posted by blausven View Post
    So, Power Ramp with 90deg means spool, when accelerating?
    And, 0deg in Coast Ramp means both wheels turn independently?

    To give more grip when accelerating out of corners, set Power Ramp to e.g. 60deg?
    To stabilise the car when going off-throttle, set Coast Ramp to e.g. 30deg?

    Or is it reversed, not 60/30 but 30/60?
    Opposite, 90 degrees is fully open, 20 degrees is maximum locking (how much that is depends on how many clutches you have).

    The engine's torque goes into the differential. For the clutches to press together, there needs to be a sideways force. 90 degrees has two flat surfaces pressing on each other, so all force goes straight together, not creating any sideways force at all. When you add angle, some of the force applied acts sideways, causing locking. 20 degrees is the minimum practical angle (any less and the shapes start getting too sharp), which gives you the most sideways force and gets the most locking out of the diff. Refer to the previous post showing the insides of a clutch LSD.


    For more stability on off-throttle, go with a low angle to maximize locking. This will prevent the wheels from turning independently so easily, and makes turning overall more difficult.

    For more stability on acceleration, go with a high angle to minimize locking, up to 90 degrees for fully open. This will allow the inside rear to spin and not transmit any extra torque on the outside rear, making it harder to get power oversteer. On the other hand you can't really get that much traction either, since you're limited by the inside rear.
    The following 6 users likes this Post: blausven, DelawareDave424, F1_Racer68, GTsimms, RobPhoboS, ShneebnaMRR108


  5. #15
    Superkart Pilot
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    As a general statement, is the following correct whilst turning?

    More locking = less stability on throttle, more stability off throttle
    Less locking = more stability on throttle, less stability off throttle
    Last edited by Brado23; 26-09-2017 at 22:54.
    The following 2 users likes this Post: DelawareDave424, Don-09141955


  6. #16
    Handling QA Lead Jussi Karjalainen's Avatar
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    As a gross simplification, yes.
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  7. #17
    Handling QA Lead Jussi Karjalainen's Avatar
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    Posted a link to the Project CARS 2 Differential Calculator v0.9 in the original post, check it out. It's Google Docs based, so everyone with a Google account can use it.

    http://forum.projectcarsgame.com/sho...=1#post1367069
    The following 6 users likes this Post: Brado23, F1_Racer68, PostBox981, sasquatch98, Thomas Sikora


  8. #18
    WMD Member senn's Avatar
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    why do some AWD cars have the centre diff as Geared AND Viscous turned on with the default setup (trying to emulate a haldex maybe??), can they infact work in partnership in pcars2 or is this just going to causes glitchy weird handling?

  9. #19
    Superkart Pilot
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    should the diffs only be on one at a time. ie. if you have Geared LSD on, then switch Clutch LSD on, should the Geared LSD turn off?

    and should you be able to turn them all off?
    Last edited by Gix916; 27-09-2017 at 11:25.

  10. #20
    Handling QA Lead Jussi Karjalainen's Avatar
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    Quote Originally Posted by Jussi Karjalainen View Post
    OK so we have a few different differential types available to you, which you can (depending on the car) turn on and off at will. You can (and we have) also combined different differential types for more dynamic behavior and to better represent the behavior of some of the more active differentials found on modern cars:
    Some parts of the geared diff model are also used for the front/rear torque distribution, which is why they're active in many AWD cars, even when the bias ratios are set to 1.0 (= open).

    Whether or not you should be able to turn all of them off depends a bit on the car, for example I don't think you can turn off the center geared diff on the cars with unequal torque distribution, at least not most of them.
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