How to test your PSI POWERBOX

This is direct from PSI, thought it may be useful to other members on here.

This is for the Digital version of the box model PB200011


There are two LED’s inside the box. The green LED is shining on idle after
40 seconds of initialization.

In some cases, it can be that the LED is going on and off (by warmed up
engine), this is not a problem. If you put on a small load on the engine,
the LED will bright stable (for example light acceleration with car stopped
or putting on the air conditioning or the window heater switched on, or
both together).

Under hard accelerations the red LED should go on. You can simulate this
accelerations by giving full throttle for a short moment and rev up the
engine to about 3800 RPM, let drop the revs down again to about 1000
RPM and push again very fast the gas pedal to reach of new about 3800
RPM.

If in this case the red LED is still not lighting up, you should try to put the
open BOX under the wipers and drive the car under load (acceleration).

Then the LED should go on, if not, probably the air mass meter is faulty or
the turbo regulation is not ok.