Besides classical ecu reprogramming, where the original software is modified and optimized, there is also another method to increase power (mainly for diesel engines), in shape of a additional module that is installed between the ecu and the injection system or sensors (also known as Blackbox, powerbox…)
Basically the ECU is given false sensor values throughout the comlete rev-range (mainly it is told: not enough fuel). So the ecu will correct this message, resulting in a higher fuel injection all the time. Also at idle.
This is resulting in power gain, but also in emission problems, thermic problems for the engine and more problems…
Sellers of these products (that are nothing else than a cheap resistor in a nice box) alwas say that you can remove it traceless for maintainance service and warranty. This is NOT true.
You will be surprised, how many error codes the service man will read out and he knows what they mean.
Also you are told that the emergency program for the engine stays completely functional. This is correct. But the ECU is already given false values and still keeps on working like normal. How can the ECU go correctly to emergency program if it gets incorrect information all the time?
The powerboxes are a low budget solution, that gives you acceptable results, but they cannot archive the same like a reprogrammed ECU.
We do not sell these Powerboxes and do not install them. Please ask the person who sold it to you to install it.