Can anyone tell me the torque ratio split for an MY03 STi Type UK??

Is it biased more to the rear and by how much?

 

If it has dccd it's adj. if not it's about 60/40 (60 front),someone with more knowledge will be along soon (thats not saying much though )

 

Sadly I haven't got DCCD

So bias is more to the front?

 

It is on the classic uk cars ,not so sure about the later ones though.Try posting in 'general technical ' you'll get a better response.
Alternativley you could try booting it out of a wet deserted 90% jct and if the back end steps out slightly and the front inside spins then its probably front bias,if however the back drifts wide and just hangs there while the front pulls you along a bit then probably rear bias not conclusive by any means but LOADS more fun

 

The torque split of the centre diff itself is 50/50. However, the unequal drop gears and diff ratio cause a slight preload on the viscous coupling, which in practice produces a slight bias to the front axle.