RE: Controlling torque v Marketing

["Lawson, Dave" <dlawson@ball.com>]

Dave,

>perhaps you misunderstood my question?  given that the haldex literature
>makes it plain that 100% drive to either axle is a function of the diff
(and
>the computer), i fail to understand your continued assertions that anything
>beyond 50% rear "can't be controlled by the computer".

I can't find a reference in the Haldex literature where it says that 100%
torque transfer is a function of this device and possible with this unit. 

As far as >50% distribution to the rear "can't be controlled by the 
computer", it's true. People appear to be using different baseline
scenarios when thinking through the problem which is causing 
misunderstandings. A great starting point is all 4 wheels on the 
same surface. The most that this device can do is a 100%
lock, at which the front and rear axles are turning at the same 
speed and the torque distribution is 50/50 f/r. Because the 
haldex is a hang on clutch on the rear axle, it can't control the
torque distribution to the front axle to get more distributed to 
rear axle, hence we arrive at the 50% number.

Now, if for some reason the front wheels have less tractive 
force than the rear (hard acceleration causing tire slip or
the fronts are on a surface which has a smaller coefficient 
of friction i.e. ice), a torque distribution of > 50% to the rear
can happen, but the haldex or it's computer is not controlling 
it, the most the haldex can do is 100% lock which gets the
distribution to 50/50. It's because of the environmental tractive
force of the front tires that allow more than 50% distribution
to go to the rear axle, the haldex isn't responsible for the
torque distribution >50% to the rear.

-
Dave Lawson