Hi there,
Ok, firstly is your car genuine RS-Four S?
Just want to make sure on that first.
Next have you really dumped the clutch to try and break traction?
On my Stag I always noticed it took a bit to get the AWD to kick in (split seconds, not seconds I mean) and ,of course, for the gauge to spring in to life.
My Stag would always break rear traction for a split second then the AWD would kick right in.
This was noticeably different from my R33 GTR (V-spec) which is an almost instantaneous "twitch" of the needle.
The next thing, and I don't mean to alarm you, is to make sure you don't have a problem with your AWD system.
As I now of one Stag (genuine Type S)that had an AWD problem but the dash warning light didn't come on. Even though the AWD dash light was working.
The front torque split gauge only came out in the Type S and 260RS versions. The Autos didn't get them.
All Attesa controlled cars are torque splitting systems, one way or another.
If you need any more help please let me know.