scfz1000

from the 2012 rx350 release it appears as follows: ..."The RX 350 AWD model features an electronically controlled Active Torque Control AWD system. Active Torque Control AWD uses an electronically controlled coupling ahead of the rear differential to vary torque distribution anywhere from 100:0 to 50:50 front to rear, depending on driving dynamics and road conditions. When accelerating, or starting off on a low-grip surface, torque is quickly provided to all four wheels. At steady speeds, torque is sent only to the front wheels, enhancing fuel efficiency.

To help provide handling agility and control, the AWD system increases rear-wheel torque when the vehicle’s front tires start to lose traction and decreases rear-wheel torque when the vehicle’s rear tires start to lose traction. On rough or sandy terrain, an AWD LOCK switch provides enhanced traction performance for low-speed maneuvering (if in LOCK mode, the system reverts to AUTO mode when speed exceeds 25 mph). To help prevent a tight corner-braking condition (shuddering) during low-speed cornering, the system reduces rear wheel torque. "

So it appears at start it is 50/50(F/R) and then 100:0 at steady speed

coolsaber

Interesting, since I would assume the vehicle`s front axle would be more then sufficent to handle 100% of load on simple startups. BUt maybe not

Scott007

In bad conditions you can hit the electronic lock button. How does this work? Are you supposed to be stopped, or moving when you press it? Do gears lock up or is it totally electronic?

LordBowral

its all new and improved ....

bootman

Check this 4WD test.

https://www.clublexus.com/forums/rx-...road-test.html