Re: All the buzz about Diffy-q's

[QSHIPQ@aol.com]

In a message dated 5/23/99 7:07:14 PM Central Daylight Time, 
orin@WOLFENET.com writes:
 
>  Locked center diff, then the speed of the front driveshaft will match
>  that of the rear driveshaft, the right front wheel will do whatever
>  speed it feels like and the left front wheel may even rotate backwards
>  due to the open front diff.  No torque is shifted to the inside wheel,
>  in fact, almost all goes to the rear.

Read Mr Eaton's post as stated again, Orin, maybe you'll see my point better:
Dave E wrote:

> >the generation 1 locker *must* and does shift torque when it is *locked*.
> >(0%-100%-0% torque shift front to rear is certainly possible).

A locked center diff would have a maximum *torque shift* (please reread) of  
50% not 100% as stated by Mr. E.  If you disconnect the driveshaft you only 
have a maximum *torque shift* of 50% as well.  How exactly can we have a 
0-100-0 *torque shift* in a locked center diff?  You can't.  My point.
 
>  This time, not much torque goes anywhere, excess torque produced by
>  the engine causes the engine, front driveshaft and left front axle
>  to accelerate - the wheel spins.

Ok Orin, reread Mr. E claims on open diffs here:
> >however, when all diffs are *open* *no* torque can be shifted.  all torque
> >outputs are equal, and 25% by definition (for awd).

Unlocked, same lifting inside front wheel scenario....
All available torque shifts to the lifting front wheel, until spin that is 
100% of engine torque, and by definition, once the wheel lifts is a *torque 
shift* of 100% of available Trg (Torque ring gear).  Once lifted that would 
be a *torque shift* of 100% not 0% as stated, even if engine total engine Trg 
output decreases.   Look at it this way, take an open diff quattro,  lift one 
wheel up on a jack, put the car in 1, let out the clutch out.  What happens?  
The car goes nowhere, but the lifted wheel spins.  That is a maximum *torque 
shift* of 100%.  You can't get any higher in *torque shift* or clearer in my 
point.  

Don't try the above trick with a locked center or a torsen.  Both will run 
you over with a torque shift of less than 100%.  Always.  No thank you, I 
haven't btdt...  :)

HTH

Scott Justusson  
'87 5ktqwRS2 -10vt
'84 UrqRS2 -20vt
'87 4Runner turbo A/T