Last post on Jul 09, 2013 at 10:14 AM
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Chevrolet Suburban, Jeep Grand Cherokee, Subaru Outback, Ford Explorer, Nissan Pathfinder, GMC Envoy, Performance Mods, Tires, Suspension, Transmission, Truck, SUV
#1421 of 1461 Re: Subaru AWD videos [wwest]
May 24, 2011 (9:05 am)
Manual trans so that '98 had the VC setup, no clutches.
Rear axle would break traction first when on power in turns. Less weight on that axle, but it would definitely get power - how else would it break traction and spin the rear wheels first?
I drove it for 9 winters, and that's just how it behaved.
Wife has an 09 automatic now and that feels different - it'll understeer. Night and day difference in feel.
#1423 of 1461 AWD in Outback: 6-Speed Manual v's CVT
Apr 28, 2012 (7:24 pm)
Is the AWD of the 2012 4-cylinder Outback different between the 6-speed manual and the CVT automatic? If so, which is better for normal on-road driving?
#1424 of 1461 Re: AWD in Outback: 6-Speed Manual v's CVT [cincinnati_dan]
Apr 30, 2012 (5:43 am)
Manuals use a viscous coupling that is fluid-filled. When the axles spin at different rates the fuild shears and thickens to temporarily bind the axles together. The default split is 50/50.
The CVT uses clutches and defaults to a more FWD-like default, then sends more power to the rear axle as needed.
I've owned Subaru with both, and I prefer the VC system in the manual. It doesn't feel like FWD in day to day use. Both are effective in the snow, particularly when paired up with good tires.
To be honest the limiting factor on a new Outback is probably the approach and departure angles, due to longish overhands. It has plenty of ground clearance.
#1425 of 1461 Re: AWD in Outback: 6-Speed Manual v's CVT [ateixeira]
May 01, 2012 (9:39 am)
"..When the axles spin at different rates..." TC will INSTANTLY activate, fully dethrottling the engine while simultaneously braking the driven, front, wheels to alleviate the potential for loss of directional control.
With the advent, adoption, of TC it is not possible for a VC to be functional absent a TC off capability. Additionally, actual VC functionality, assuming TC off, will always compromise ABS and stability controls.
As a result of the above limitations/restrictions most modern day systems using a VC have had the fluid reformulated such that the VC remains forever flaccid.
#1426 of 1461 Re: AWD in Outback: 6-Speed Manual v's CVT [ateixeira]
May 01, 2012 (9:51 am)
"..sends more power to the rear axle as needed.."
Not technically correct.
PRE-EMPTIVELY sends more power to the rear axle, "needed" or no, at times when loss of directional control is most likely to otherwise result. Those times fall into only 2 categories, low speed acceleration, and when turning tightly or turning while accelerating.
Other than those times the system will default into a definite front torque biasing mode. Regardless of the instantaneous mode of operation loss of directional control is such a dire threat for FWD or F/awd vehicles that the INSTANT response to wheelspin/slip, DRIVEN (front) wheelspin/slip, will be activation of TC.
#1427 of 1461 Re: AWD in Outback: 6-Speed Manual v's CVT [ateixeira]
May 01, 2012 (9:56 am)
There is also an unstated, unspoken, advantage to the DCCD F/awd system in that it can be disabled INSTANTLY should ABS, TC, or VSC (stability control) activate.
#1428 of 1461 Re: AWD in Outback: 6-Speed Manual v's CVT [wwest]
May 01, 2012 (11:05 am)
absent a TC off capability
There's an off switch.
#1430 of 1461 Re: WRX Saves a Ram [ateixeira]
Jul 27, 2012 (12:54 pm)
But, but ... that's not possible. WRX a "fake" F/AWD and RAM is a "real" R/4WD.