Alright buddy. But, it does. Like i said..by "Open" i mean that the electronic dccd is not diverting more torque to the front than the mechanical 41/59. This explains it a bit. Also from the Subaru Brochure

"Exclusive to WRX STI, Driver Controlled Center Differential (DCCD) All-Wheel Drive uses an electronically managed multi-plate transfer clutch
and a mechanical limited-slip differential in conjunction with a planetary-gear-type center differential to control power distribution between
the front and rear wheels. Featuring manual and three automatic modes, DCCD splits power 41% front and 59% rear. Sensors monitor
parameters such as wheel slippage, steering angle, throttle position and braking to help determine torque distribution and direct it to the
wheels with optimum traction. DCCD also features a limited-slip helical front and Torsen® rear differential."

So the electronically managed transfer clutch diverts different amounts of torque to the front, beyond the 41%, when you set the dccd to any mode different then the "open" mode. (open is a bad word choice, but that's the terminology that's come about.) So the front torque can range from 41-50% and the rear's range is 59%-50%.

 

All that explaining and I don't think you understand what he's saying…
which is: Yes the STI may torque split front to rear and to the wheels that slip but the torque transfer is based on adding brake or cutting power to the wheel with no traction.

This differs from the Evo...
which is: automatic torque split/control(via it's programming). It also has torque vectoring to the outer wheel when needed. It's not brake driven but power driven, meaning more power is given to the outside wheel without braking or cutting power to the inside. Subies can't do this yet.

STI= driver and auto control front and rear torque split w/ limited slip diffs.
Evo= auto control torque mngmnt with L/R torque vectoring and limited slip diffs.

At least that's the way I get it.

 

You're totally right, and I was aware of this. That is a great functionality of the EVO awd system. I was just correcting the fact that the STi dccd can shift the front to rear torque bias, which FFRGTM was stating was impossible.

 

Sorry hillhucker, Let me try this again and contradict myself in the process.

In open mode the torque split is static, the one advertised on the brochure.

While slipping or locked the dccd CAN "virtually" vary the torque front to rear, however it's really only reactionary to a pair of wheels slipping.

All I'm really getting at is the dccd can't actively change the torque split front to rear like the evo rear diff can side to side. My harsh wording earlier is really in response to listening to idiots with sti's tell me that their center dccd knob can turn their car into a rwd sports car... "just tuuuurn the knob back for more rear torque... "

 

I did not have it right when i posted last. You're right, in the open mode the torque split is static and in actuality this mode the car does respond and act like rwd cars i have had. (plenty lift-off oversteer, power-on oversteer etc.) Yes, any one of the other dccd setting than open keeps the front and rear axels spinning at a predetermined rate by the adjuster (it's a little momentary switch on the 08+ now). ie 50/50 has the axels spin at the same rate whereas 41/59 obviously the rear can spin at a higher rpm than the front. The torque split can actually vary from ~ 99/1 to 1/99, so to keep to axels spinning at the selected rates. Also the 08+ STi has three auto modes (similar to the evo), for different traction surfaces that vary the spin ratio depending on the current dynamic happening in the vehicle (It does employ a yaw sensor now). Here's a really good thread, if any one wants more in-depth info on the 08+ STi awd control. It starts out with me testing different modes with certain tires on slick surfaces, but the differentials, control, terminology everything is covered well.