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the torsion value must be somewhere between 0.0 and 1.0 advanced (according to VAG engine manual between -3 to 3).
But if you want your engine being in the design point you want 0.0.
But, when you have a value out of range you'll see 0.0, so be careful.
There are loses of max torque and power also when retarded engine (too retarded and engine will not start. Going too advanced and you will blow up your engine, but the bolts will not permit to go too far. I noticed a change in Power from 97 to 107 bhp in the wheel. And in the top speed from 171 to 187 km/h.
Best place for that 1.9 TDI BXE was +0.5 ( 0.5 advanced) althought it wasn'y any differences at all between real 0.0 and this final setup.
+0.5 (-0.5 for your car) was good because in that ECU map the S.O.I. inection timing (in ms.) map (with warm engine) was the best fit and compromise of advancing the entire map for that particular setup. It's hard and long to explain why.
the MFD values are proportional (and you can callibrate them) to the ECU ones (that you read with VCDS), that ECu values are proportional to the voltage applied to the injectors.
There is something wrong in the ECU OBDII values when you change torsion (or some other things) because values that depend linearly with the variable are supposed to be proportional and the VAG ECU give you wrong figures when you change offsets or slopes.
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