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AWD technics, is the real all wheel drive ???

This is a discussion on AWD technics, is the real all wheel drive ??? within the Focus RS Discussions forums, part of the Focus RS Forums category; Originally Posted by bugsmx3 Anyone see any of this??? Electronic Torque Vectoring - GKN Driveline or this??? Disconnecting for Fuel efficiency - GKN Driveline At ...

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Thread: AWD technics, is the real all wheel drive ???

  1. #71
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    Quote Originally Posted by bugsmx3 View Post
    At least as far as the second article, Ford explicitly forewent this. It costs something like 300ms to reconnect that drive and it was too steep of a penalty for a performance vehicle. So there is always power to the RDU, 100% of the time. At that point the computer decides whether to send that power to the wheels, and how

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    The way I understood it is that there is not always power but there is always drag/friction or whatever for lack of a better word because the rear is always connected. So you lose out on some MPG because the rear can never truly be free spinning?

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    Quote Originally Posted by Soundwave View Post
    The way I understood it is that there is not always power but there is always drag/friction or whatever for lack of a better word because the rear is always connected. So you lose out on some MPG because the rear can never truly be free spinning?
    When the car is in FWD mode the clutch packs in the RDU are completely disengaged, the drive shaft and gearing before the clutch packs will still spin, causing a certain amount of drag.

    The rear end will be "free spinning" as you put it, not engaged with the axles/hubs/wheels/tires, but because the engine still has to spin the weight of the drive shaft and the gearing in the RDU, the vehicle will lose some fuel efficiency in FWD mode compared to a pure FWD vehicle.
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    Quote Originally Posted by Soundwave View Post
    The way I understood it is that there is not always power but there is always drag/friction or whatever for lack of a better word because the rear is always connected. So you lose out on some MPG because the rear can never truly be free spinning?
    It can be truly spinning freely but you are spinning unnecessary mass. There is no point to spin drive shafts and gears to basically have it do nothing when the clutches are open and not diverting power to the rear.

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    So are you both agreeing with my but correcting terminology? I can't tell lol I just know that it will not ALWAYS have power going to the rear.

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    Quote Originally Posted by Soundwave View Post
    So are you both agreeing with my but correcting terminology? I can't tell lol I just know that it will not ALWAYS have power going to the rear.
    correct lol, The easiest way to state it is basically power is always going through the driveshafts and into the RDU. The RDU then will apply the clutches to use that power, the only thing that controls the drag on the system is the clutches. Everything before the clutches will always be rotating and this is where you have your excess drag on the system.
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