Speed at which AWD stops working

[mghuntoon]

I was told the front to rear transfer of power during periods of front wheel slippage works up to 18 miles per hour. Above 18 mph the AWD transfer does not occur.

Can anyone confirm this? I have an 04 CR-V
Thanks

[Honda Tech]

If the propeller shaft input speed to the front pump of the rear differential is greater than the rotational speed of the rear axle shafts (which are driving the rear pump of the rear differential), torque transfer from the propeller shaft to the rear axle shafts will occur.

The "AWD" is operational for the "Real-Time" instance in which it is needed - when the front pump speed is greater than the rear pump speed.

If the rear pump is turning at a speed equal to, or greater than, the front pump, the vehicle will be FWD, not AWD.

There are fail-safe protections built-in, due to temperature and excessive pressure differentials between the pumps, but there is no "vehicle road speed" inhibit.

[sleeksilver]

It is not like the VSA system in the Pilot or Ridgeline, it will work when slip is detected regardless of speed.

I have noticed that the higher the RPM (closer to redline) the less the rears will engage.