from what i have gathered about the gtir is that
normal spec has viscous center and rear diff not sure if the front diff is viscous but i have seen one and it come in spider configuration
the so called dakar had lsd center,front,and rear weather this true is questionable!
carn,t go into great deal about diff's because of my imperfect knowledge so here what i know,
VISCOUS diff termed (open type) has many advantage them being, one it is more reliable than some, (if the oil is changed on regular basis,) can handle alot of power, and is road friendly, the way it work is that it uses fluid to lock diff depending on whichever wheel losses traction and spin's. in the gtir you,ll notice that when launching the front wheels spin until the fluid has suffcient move and then lock's the axle.which give less stress to drivetrain.but the disadvantge is that the oil heat's up and cause alot of drag and power useage that other don,t,also the fact that you carn,t control drive or torque distribution to rear biased. also useable torque is restricted to by wheel with the least traction
L.S.D differ they have plate with clutch on each side of the diff. which give both wheels the same power output, they are more harsh on the drive train when launching.the power and torque loss with these diff is less and they have less drag.
A.T.B diff (automatic torque basis) quaiffe make the one the best diff's. very modern, can handle power/ torque to different wheel, without slippage,has the ability to give 50/50 percentage of power to each wheel.you can launch harder/faster because there is no fluid to wait for
A.Y.C active yaw control which use fluid to to control torque and power distribution not sure how good it is but the majority of evo ditch for the rs version
HELICAL diff, this diff uses gear for distribution is better than the above due to the fact it can change torque output to rear biased. is really strong
durable and efficient.
increasing power to rear torque biased will obviously give better handling characteristics, less understeer.
if anybody wish to add info please do so, if i have made a mistake feel free to correct me :lol:
zia