The all wheel drive doesnt work only the front tires spin in the snow
The 08 Vues AWD system is very different than from previous models. The
new Vues system is more like the technology on the Outlook. I' don't
know detail on the hardware, but from a function standpoint there are
two big differences:
1)The system is PREDICTIVE, not reactive. It does not wait for
wheel-slip to make it engage. The system monitors throttle position,
steering angle ect. and re-directs torque before wheel spin occurs.
2) The old system sent extra torque to the wheels that were slipping to
boost traction. The new system sends power to the wheels that are
The result is a better, smoother system that will do a better job of keeping the Vue from getting stuck.
The old system was a single gerotor type AWD system. Essentially, a
gerotor AWD system uses differences in rotating speed to spin a pump
and apply pressure to clutchs. The single gerotor system used in the
Vue essentially engaged and disengaged the rear axle when a differences
in rotating speed occurred between the drive shaft and rear differential
(indicating the front wheels were spinning faster the rears). From here
on out, power goes into an open differential and was distributed
accordingly (i.e. not very well).
GM also uses a twin gerotor system in the form of Versatrak. This
operation in much the same manner, using a difference in rotating speed
to spin up a pump and apply pressure to clutches, except the Versatrak
system has a pump for each output axle. This allows the rear differential to act of each rear axle much in the way a limited slip
differential does, better managing torque distribution.
The new system used in the Vue (as well as the Outlook, Acadia, and
Enclave) is controlled by a microprocessor and operates by means of an
electromagnetic clutch. It is very similar to the Haldex system
marketed by Haldex Traction AB. The main difference being that Haldex
still uses hydraulic pressure to apply the clutches, while the
electromagnetic system used by GM (which I believe is developed by Borg
Warner) uses electromagnetic force to apply the clutches. The operating
principles are the same though. The new GM system is well integrated
with stability control, traction control, and ABS. The system actively
monitors vehicle dynamics and driver input to determine when to being
engaging AWD before it is actually needed. With the ability to
manipulate power delivery using AWD and stability control (by selectively applying brakes at each individual corner), the new Vue is
very robust in terms of torque management. For all you folks in the
snow belt, it should be dynamite in slippery conditions!
Hope this helps answer your question. Good luck and be safe on the snow.
Dec 12, 2009 |
2003 Saturn VUE