"Tomes" <askme DeleteThis @here.net> wrote in message
news:oSiki.6343$zA4.531@newsread3.news.pas.earthlink.net...
> "Ray O" com...
>> "Tomes" ...
>>> "Ray O" ...
>>>> "Gareth" ...
>>>>> Will there be a AWD model?
>>>>
>>>> Toyota calls it a 4X4, but I think it is AWD.
>>>
>>> Here is what The July 9 issue of AutoWeek says, and you can conclude
>>> from there:
>>> "The optional full-time four-wheel drive on the gasoline-powered
>>> Highlander is the same system as that on the Sienna minivan. "It's not a
>>> rock crawler by any means," said Toyota general manager Don Carter. But
>>> a mile or so of driving through a sandy desert wash showed the
>>> Highlander could get over rough terrain easily enough.
>>>
>>> Four-wheel drive on the hybrid consists of a rear electric motor
>>> engaging under acceleration or when the front wheels slip."
>>>
>>> http://www.autoweek.com/apps/pbcs.dll/article?AID=/20070704/FREE/70628.../1532/F
>>> Hope this helps,
>>> Tomes
>>>
>> Full-time four wheel drive is commonly referred to as all wheel drive.
>> BTW, I believe Toyota's general manager is Bob Carter (I used to work
>> with his brother).
>
> I don't know, I have always thought of them as 2 different animals. AWD
> drive being the situation where it drives off of only one wheel, choosing
> out of the 4, and 4WD being where it is driving off of the 2 axles at the
> same time, either with a slip or noslip.
> Tomes
"Full time four wheel drive" sounds more rugged than "all wheel drive" so
the former is often used to describe the system in SUV's. When driving all
4 wheels on dry pavement, a center differential is used to split the power
between the front and rear axles intead of a transfer case. A center
differential can vary the amount of power transmitted to the front and rear
axles, while a transfer case splits the power evenly. The transfer case's
even power split can cause premature tire wear and drivetrain binding on dry
pavement so it is not practical in permanent 4WD applications but they tend
to be more ruggedly built than center differentials. There are many
variations of the AWD theme, like center differentials that lock or have
viscous couplings, but they all allow variation between the front and rear
axles.
--
Ray O
(correct punctuation to reply)
>> Stay informed about: 2008 Highlander