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Getting back onto topic...
Based on the photos here, the chip is plugged into the fuel rail pressure sensor. As has already been mentioned, this can fool the ECU into thinking the pressure is lower then it is, therefore giving higher injection pressures and more fuel for a given injecton period.
If this is a simple resistor, then the difference will be a set amount across the pressure range but it may work on a lookup table method where the output can be set to be anything for each value of input.
It is not possible to alter the injection timing without actually replacing the ECU maps as this is where the signals for the injectors come from.
Also the turbo boost is controlled separately and is regulated by feedback sensors. So, although adding more fuel will give higher exhaust gas temperatures and theremore the potential for more boost, the actual boost value for a given speed and load condition will still be controlled by the ECU.
Without wishing to be too dismissive of the DTUK chip, it seems a bit of a crude way of getting more power but on the other hand, I'm keen to see what can be achieved.
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