Toyota RAV4 Forums banner

1 - 2 of 2 Posts

·
Registered
Joined
·
1 Posts
Discussion Starter #1
how does the awd system work when one wheel has lost traction.does it have some mechanism to lock it or will it just keep turning?
 

·
Super Moderator
Joined
·
813 Posts
Comprehensive info: Toyota RAV4 FAQ (Frequently Asked Questions)

In essence, if one wheel loses traction, all the power goes to that wheel (due to open differentials) and you're stuck.
If you own a manual, you press the centre differential lock button which forces 50% of the power to the front axle and 50% to the rear.
In the above scenario, assuming the slipping wheel is the right front one, the left front one remains stationary (since the full 50% power diverted to the front axle is wasted on the slipping wheel).
But the rear wheels are now receiving the remaining 50% power and most probably will propel the car out of the sticky situation.

Scenarios (result):
Open centre diff:
Any wheel lacking traction (= stuck)
Locked centre diff:
Either front, or both front wheels lacking traction (rear ones have drive = mobile)
Either rear, or both rear wheels lacking traction (front ones have drive = mobile)
One front AND one rear wheel lacking traction (drive wasted to those spinning wheels = stuck)
Locked centre diff AND optional rear Torsen (limited slip) diff:
Either front, or both front wheels lacking traction (rear ones have drive = mobile)
Either rear, or both rear wheels lacking traction (front ones have drive = mobile)
One front AND one rear wheel lacking traction (drive diverted to the opposite rear wheel = mobile)
Two front AND one rear wheel lacking traction (drive diverted to the opposite rear wheel = mobile)
Two rear AND one front wheel lacking traction ( = stuck)

If this is not enough, post another question and we will be happy to oblige (but do specify transmission type for more definitive insight).
 
1 - 2 of 2 Posts
Top