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Old 06-12-2012, 05:43 PM   #75
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Joined: Jun 2008
Location: Philadelphia, PA
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Now he'll just have to add the SAE and all the world's car manufacturers to his list of people who are wrong about the definition of AWD.

Originally Posted by gmiguy View Post
A vehicle is all wheel drive if it has the ability to send power to all of its wheels, even if this happens only under limited circumstances that occur infrequently or in a manner that is actually not desirable in terms of continued forward motion or overall vehicle control.

Why is this even something that people debate about?

The people who design, build, sell, and regulate vehicles for a living get to define the terms and set the standards; not random people on the internet. This definition has already been set, and it appears that they didn't bother to ask you for your input.

Specifically, in Standard J1952 the SAE defines all wheel drive as being "a vehicle drive system with the ability to drive all wheels". That's the entirety of the definition.

There is absolutely no mention of "Diff x 3" or any other specifics of the system.

They do, hoewever, make it clear both textually and diagrammatically that there are in fact many different types of systems that are legitimately considered to be All Wheel Drive, and that 3 differentials are not a required feature.


SAE > you.

The end.
TAT 2008 / Colorado 2010
"Both the man of science and the man of action live always at the edge of mystery, surrounded by it." -Oppenheimer
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