The jb4 cant really add timing. Timing targets are programmed into the calibrations and i know you know the piggyback doesnt change and ecu tables directly but rather their outputs by intercepting their sensors.
So for fuel they can intercept the fuel rail sensor and bias it creating more fuel and allowing for a bunch more headroom in trims.
For boost, they can obviously intercept map and if needed the electronic wastegate to gain more control (something ive emailed terry about testing for us now)..
but for timing there really are no sensors to directly manipulate so instead all you get is very passive manipulation of timing through the manipulation of boost. The more you attenuate the boost signal, the less boost the ecu thinks the car is making and some ecus are therefore calibrated to request more timing. It works ok on some ecus that have very complex timing tables that can take advantage of lower boost, higher octane, etc to make power...
The problem with the alfa is that this doesnt seem to happen. Stock tune shows no timing advance even when boost is attenuated.
This is a bummer if you want to benefit from e85 on the stock turbo because, lets say, boost is pretty maxed on stock turbo. So you want to go heavy on timing. Now you need a flash tuner wiling to calibrate an e40 file for you.
Its not much of an issue though using the jb4 on a hybrid turbo because youre going to be adding a significant amount more boost up top and chances are very slim youll be looking to or able add more timing on top of that.