Quote:
Originally Posted by mtberman
That means it's AWD, not 4WD. If it was 4WD, Natalie would have locked the system by pressing a button or pulling a lever or whatever and then Jerry would have seen the two wheels on his side of the vehicle spinning at the same speed, not at varying speeds.
That's really the biggest difference between the two: AWD systems allow a continous and variable amount of power to be fed to the secondary drive end of the vehicle (most often the rear) if the primary drive (most often the front) wheels slip. As Jerry did, you can stand outside and watch it varying. The front will slip a bit, then the rear will either grab or begin to slip a split-second later. The pattern will repeat, F-R and L-R.
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It's still not AWD just because the wheels spin at different speed. If the system in question only transfers 25% power to the rear on detection of front wheel slipage and disengages once traction is back. It's still a fixed amount of power going to the rear. I guess we are arguing over symantics.
A real AWD system blows away your typical 4WD system in sophistication. I believe Honda/Acura have the SH-AWD system which not only transfers power to the rear it can vary the amount of power to either rear wheel (very clever). You will not find this in a 4WD system on a truck.
Most AWD system have power however minute going to all wheels all the time (and in some cases have no power going to a set wheels in ideal situations), nothing to engage. Most 4WD system have to be engaged, otherwise they are operating as 2WD systems.
The system in question is a hybrid of sorts. ;-) It's a 4WD system acting like an AWD system.