The Turbo will probably kik in when the AMP is lower. That's most of the time when the motor reaches his max speed with the settings you are using.
Than it will ad extra timing and than your amps will go up again but also the RPM.
So when you gear very light. even lighter than 6.1, you will see in the software without the turbo that your top speed will be halfway the straight.
As you put on than the turbo you will see that the car will keep going faster till the end of the straight.
The SPX ads along the way timing. That's what i think because how it works.
tested it and it works great with 1 disadvantage. This way you have less acceleration than the Tekin has.
I drove a SPX and i didn't like it. it looked like it has no throttle at all.
only advantage off the SPX this way is, is that you can gear it quit light and still have a good speed.
Disadvantage of a SPX. it loses power and i have seen several burnt out.
Also is the SPX not ready for 1C lipo
they must buy a new speedo as they want to drive 1C lipo