How much power is transfered to the Rear wheels?

vtecn8ivevtecn8ive Senior Wagonist
in Engine & Drivetrain
When front wheels slip, how much power is transferred to the rear wheels to help control the vehicle?

I've heard numerous times its 90:10, but I've heard a couple that its better than that.

Comments

  • vtecn8ivevtecn8ive Senior Wagonist
    no one?
  • JakerJaker familEE
    That question has been asked a 1/2 dozen times, and answered each time. Please search.
  • vtecn8ivevtecn8ive Senior Wagonist
    but I did search :(

    Any help with the links to previous topics would be nice. I usually search all of my stuff before posting up, but didn't find anything :oops:
  • JakerJaker familEE
    The power transfer inside the transmission is purely mechanical, in that there are no torque distribution devices other than the gears that send power to the front driveshafts and to the transfer case/front flange on the driveshaft. In a 100% slip situation (all 4 wheels on pure ice) the torque would be equally distributed to the front and the rear (50/50). If the front wheels alone were on ice, 100% of the output of the motor would go to the rear wheels. The viscous coupler decides how hard the rear wheels work, based on how much traction the front wheels have. In any case, the power comes out of the transmission 50/50. If the front wheels have grip, none of the power gets to the back wheels because the viscous coupler is not doing any "coupling". The coupler needs to see a wheel speed difference between the front and rear wheels before it starts apportioning power to the back.
  • vtecn8ivevtecn8ive Senior Wagonist
    How about a sticky for that answer?

    That is the impression I thought was happening but people kept throwing numbers out and so I was caught second guessing my own intuition.

    Thanks again.
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