How does the new four wheel drive system in the Ferrari FF work?

1 ANSWERS

1. James Harley
   

    FF's new four-wheel drive system is engineered and patented by Ferrari known as the 4RM, Being 50% lighter than a conventional four-wheel drive system the 4RM provides power intelligently to each of the four wheels as needed, this system works only on comfort and snow modes.
   
   the system is based around a second simple gear box, the system has only two forward gears the 2nd and 4th plus reverse with gear ratios 6% taller than the corresponding ratios in the main gearbox, so the system is only active in 1st to 4th gears. The connection between this gearbox and each front wheel is via independent haldex-type clutches, without a differential. Due to the difference in ratios "the clutches continually slip" and only transmit, at most, 20% of the engine's torque.

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