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Thread: Citroen WRT

  1. #451
    Senior Member Sulland's Avatar
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    So he has been there, and done that!
    www.parcferme.no

  2. #452
    Senior Member NickRally's Avatar
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    Quote Originally Posted by OldF View Post
    Nick, thatís a solution Iíve never seen before. Does such differential actually exist?



    Audi has a nice looking solution for torque split. This crown gear differential has a torque split front/rear = 40/60. The rear axle is rotated with a bigger diameter/radius than the front axle and therefore get more torque.

    http://www.autozine.org/technical_sc...ion/4WD_1.html



    A video of how it works.

    https://www.youtube.com/watch?v=xZ9x9jHkTrg



    The figure on page 311 explains the torque split of a planetary differential (Old Ford with a front/rear torque split 34/66).

    https://books.google.fi/books?id=2_Q...20diff&f=false



    Mitsubishi 3000GT AWD System http://www.stealth316.com/2-awd3.htm



    Hi OldF, yes I have seen one many many years ago, though they are not popular at all, but I found this scheme useful for visualizing the principal of asymmetric diff as it can be directly compared to a symmetric one.

  3. #453
    Senior Member itix's Avatar
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    Quote Originally Posted by NickRally View Post
    itix, below are couple of simple images I sketched, to give you an idea how an asymmetrical diff can physically look. Most asymmetric diffs actually do not use this arrangement, but this is a simple way of representing an asymmetric diff and should you decide to use such simple design in your vehicle, it will still perform such function.

    So here it is starting with an image of symmetric diff for reference:



    And the asymmetric one:



    You can see how in the asymmetric diff, one of the side gears is smaller than the other which would result in smaller torque being applied to the shaft connected to that side gear.
    That makes sense, thanks a bunch!
    The larger pinion gear on one side would create a larger torque due to its larger radius.

  4. #454
    Senior Member NickRally's Avatar
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    Quote Originally Posted by itix View Post
    That makes sense, thanks a bunch!
    The larger pinion gear on one side would create a larger torque due to its larger radius.
    Correct.
    I am pleased it was useful.

  5. #455
    Senior Member itix's Avatar
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    Quote Originally Posted by OldF View Post
    Nick, thatís a solution Iíve never seen before. Does such differential actually exist?



    Audi has a nice looking solution for torque split. This crown gear differential has a torque split front/rear = 40/60. The rear axle is rotated with a bigger diameter/radius than the front axle and therefore get more torque.
    etc etc
    Very interesting also. Somehow I doubt the center diff on WRC cars are viscous couplings though. They intuitively seem like a big wear point (but I could be wrong).

  6. #456
    Senior Member Eli's Avatar
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    If in doubt, flat out!

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    Senior Member AnttiL's Avatar
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    Just quotes from the Matton interview I posted a couple of days ago.

  8. #458
    Senior Member Eli's Avatar
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    Quote Originally Posted by AnttiL View Post
    Just quotes from the Matton interview I posted a couple of days ago.
    Just shows you how slow are Autosport with their news....
    If in doubt, flat out!

  9. Likes: pantealex (7th July 2017)
  10. #459
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    Anyway on the topic of Meeke in Finland. No matter how he performs people will always point out that they were right and others were wrong.

    If he does well
    - fans will say it shows he should have never been dropped
    - the other side will say it shows that getting dropped made him more stable

    If he does bad
    - fans will say it's because of the pressure after he was dropped
    - opponents will say it shows it was right to drop him and that he has serious issues

    But clearly for his future not only at Citroen but also in other teams It will be rather important. Worst he can do is push and crash along the way, even if it's from 1 min lead on last stage. That said driving carefully and ending 8th without any top positions probably won't help either. Anything above 6th (or more precisely after Neuville, Ogier, Latvala, Tanak, Paddon but before all the rest), should be ok. Top3 result beating 1-2 of those will be like a win.

  11. Likes: itix (9th July 2017),lankey555 (6th July 2017),pantealex (7th July 2017),steve.mandzij (6th July 2017),[RMC]Pip (7th July 2017)
  12. #460
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    One the other hand, anything less than a dominant win (like 2016), will be a true measure of the deficit of the shortcomings of the car. If he does manage to pull the rabbit out of the hat... well... what do you say... he is a legend in Finland, or they have sorted the car? Suppose it depends on his advantage over his team mate. Still dont quite understand why Mikkelsen is not entered in Finland? It it truly because there was no car, or Mikkelsen really didnt want to do it? Still, I think the team needs to give a very clear public statment of what they want from Meeke, but at the minute it looks like they are pushing him for a win, to pull them out of the PR shithole.
    Quote Originally Posted by mknight View Post
    Anyway on the topic of Meeke in Finland. No matter how he performs people will always point out that they were right and others were wrong.

    If he does well
    - fans will say it shows he should have never been dropped
    - the other side will say it shows that getting dropped made him more stable

    If he does bad
    - fans will say it's because of the pressure after he was dropped
    - opponents will say it shows it was right to drop him and that he has serious issues

    But clearly for his future not only at Citroen but also in other teams It will be rather important. Worst he can do is push and crash along the way, even if it's from 1 min lead on last stage. That said driving carefully and ending 8th without any top positions probably won't help either. Anything above 6th (or more precisely after Neuville, Ogier, Latvala, Tanak, Paddon but before all the rest), should be ok. Top3 result beating 1-2 of those will be like a win.

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