This is probabaly a stuid question and I should get flamed, but maybe I don't understand the ACD.

So anyway people were posting on another thread saying snow sets the power to 85 front 15 rear, and thne the other two are like 40/60 and 60/40 or something. BUT doesn't this mean if you were at the track to avoid breaking the TC which I believe is stronger now anyway with the LSD so shouldn't be an issue, if you set it on snow wouldn't you spin your fronts and take off similar to fwd?

Or am I just missing something?

Jsut asking cause on my 03' evo I blew the TC twice from popping the clutch not slipping.

 

i think the torque split is variable in those modes, not constant, so i'm not so sure about that. i remember it was in the cold rain i tried launching and my friend noticed that there wasn't any extra spin in the front. (he was observing from outside)

 

Hmmm... Good point... So when does it actually come into play...

 

The ACD is basically a standard gear diff with an clutch that limits the differential action. Whereas the VLSD on the standard 03-04 evo is mechanical and therefore acts based solely on the speed difference between the front and rear axles, the ACD is electronic and can behave based on a program that takes inputs from various sensors and the mode. In effect, it can act as a purely open diff (100 front/ 0 rear) to 50/50 if the diff is fully locked. In any case, no more than 50% of the torque can be directed to the rear axle. Also bear in mind that just because the ACD can act as an open diff, it doesn't mean that all the torque is going to the front in this mode. 100% can go to the front only if the front wheels are slipping and the diff is fully open, otherwise, you'll have a nominal 50/50 torque split. Once the frontwheels are slipping, the ACD locks up and sends power to the rear, so in reality you'll never really be spinning the front wheels with ACD, especially since the system proactively locks up the diff on launch, regardless of mode.

 

It is true though that the TC is less prone to break now due to the LSD and ACD right?

 

Too many variables to predict. New TC, new front LSD, it may be stronger in some areas but weaker in others. Only time will tell.

 

The 5 speed ACD setups in the usdm 05 evo's should be similar to the jdm evo VII. At leased that's what I figured.