Active Torque Vectoring?????? - Page 2
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This is a discussion on Active Torque Vectoring?????? within the STi Technical Forum forums, part of the Tech & Modifying & General Repairs category; I've been driving rather flabby creme puff cars for a few years now so I expect quite a significant change ...

  1. #16
    Administrator TheJ's Avatar
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    I've been driving rather flabby creme puff cars for a few years now so I expect quite a significant change from the fun stand point.

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  3. #17
    zax
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    Quote Originally Posted by TheJ View Post
    Traction mode should turn off the most intrusive stuff at least, no?
    No idea. I've only been able to drive it for 1.5 days... Wife has had it the last 5 days
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    Quote Originally Posted by zax View Post
    No idea. I've only been able to drive it for 1.5 days... Wife has had it the last 5 days
    -The J
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  5. #19
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    I've been really thinking this through and have been over all of Subaru's literature (what little there is).

    It is possible that Subaru applies the brake hard enough to overcome the TBR of the Helical front LSD. This would be very inefficient as the car would essentially be lessening the torque on the inner wheel as well as overcoming the torque transferred by the Helical front LSD. This concept is still on my mind and still defies logic.
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  6. #20
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    I think I've realized the error in my understanding. I was thinking about this in a static frame with equal traction on both inside and outside tires.

    In a corner, the outer wheel is loaded by the component centripetal force acting into the suspension. As such, the outer tire typically has greater traction compared to the inner tire. At this point, the Helical front LSD is actually applying torque to the outside wheel up to the TBR (I think this is 2.7:1 from what I've read). The TBR represents the MAXIMUM amount of torque that can be transferred from the inner tire to the outer tire dependent on inner tire traction. At the limit of traction, the inner tire cannot transfer any torque to the outer tire (the inner tire is now slipping, so no torque can be sent to the outer tire!). This is where the ATV steps in, applying the brake to the inner tire and sending more torque to the outer tire. Remember, the helical differential is already sending the maximum amount of torque (according to the TBR), from the inner tire to the outer tire, so as long as the outer tire has more traction, the ATV will be effective at transferring torque to the outer tire.
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