Taken from the instructions...
Originally Posted by Beato
DTUK® GREEN - Adjusting your system
When you receive your DTUK® GREEN/RED it will be preset by ourselves at a low/sensible setting.
If you look at the bottom of your system, (opposite end to the serial poer connector) you will find 2 number 10 torq screws.
If you remove these, and the plastic base you will find a Green/Red LED and blue dial.
On receipt of your box, the arrow in the centre of the dial will be positioned at 7,
We suggest that you drive your car on this setting before making any adjustments to the system
During the test drive, please check for smoke whilst the car is under load. A poof of smoke around about 2,000 rpm as the turbo kicks in is expected but should disappear shortly afterwards.
Adjusting your system
after your initial test drive you may want to "tweak" the system to find the optimum setting for your car.
The dial has markings,1 – 9 followed by A-F.
Please note that every car is different, and there could also be variations in systems too, so if you read that "Joe bloggs" has his box set to D, and you find that at D your car either smokes or causes an engine management light, then don’t worry as this is a guide only and we are dealing with 2 mass produced products with varying tolerances.
To tweak the system you need to remove the base of the box, and then turn the dial in small increments, one position at a time, so from 7 go to 8,9 then move onto A
After you have adjusted your system this small amount, we advise that you re-test your car, again checking for smoke under load or engine management lights.
If you are happy at this point then re attach the base of the box and enjoy.
If you feel you want more, then continue to turn the dial in small increments as explained above, making sure that you test drive the car after each adjustment.
If you turn the box too far and exceed the engine tolerances then you will either see smoke under load or an engine management light. If this is the case we suggest that you turn your ignition off, re adjust the system (turn it anticlockwise to turn it down) and everything will be fine.
If in doubt, please contact us on either number that is supplied with your system