I've made some logs with this engine (180 HP, 9.5:1 CR) on stock motronic 7.5
From 2001 they're equipped with WBO2 and always running in closed loop, allowing 25% fuel adjustment to happen.
Lambda: it's always cruising at ~lambda 1.0, even when the engine is cold.
On load (0.6-0.7 bar boost): lambda 0.94 till 4000rpm, then it gets really thirsty, lambda 0.80 and even richer at the top (>6000)
I think this is curing knock caused by the small turbo and high CR.
Ignition is interesting also, at wintertime I see 15-18deg BTDC on boost, but hot summertime it was 0-3deg BTDC and felt really weak on 95 octane pump fuel.
This engine seems to be near knocking all the time, and motronic relies heavily on the stock knock sensors.