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Re:differences in 4WD, AWD, full time 4WD
Good point Steve.
If the issue is ice performance, more weight per square inch of contact patch is a bad thing. It is the formation of water in the margin between tire and ice that makes ice truly slippery. The formation of ice is due to transitional melting from the pressure of the tire. The less the PSI, the less likely the water layer will form. We have a Sube Wagon and it's quite good on ice. But we had an Audi A6 and it was far superior. I believe it is because the Quattro system on the Audi provides a starting point of 25% torque to each of the 4 tires at all times, which minimizes opportunities to break loose. The vast majority of competing AWD systems REQUIRE slippage to activate, which means something's slipping from the get go. Want to go anywhere at any time in a car? Get a Quattro. Want to be nearly invincible, slap on a set of studs or winter specific tires.
DougM
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