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Technical Overview
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Power enhancement and common methods for diesel engines


Whichever method is used for power enhancement, it's absolutely critical that the product is developed in a proper way. To develop power enhancement systems, extensive knowledge of engines and vehicles in general are required. Far-reaching knowledge about the particular vehicle in development is also essential. A well-equipped engine laboratory is a necessity in order to calibrate an engine for high performance without compromising reliability.



What´s normally called tuningbox, dieselbox or powerbox is a simple little controller that scrambles a few signals to fool the engine controller to provide extra fuel. Most often, just one sensor signal is fooled. In common rail engines, the fuel pressure signal is the one. Fuel pressure is one of the parameters that engine manufacturers strive to keep as high as possible because in many cases, it provides better engine characteristics. Raising the fuel pressure above the normal maximum level shortens the life of the fuel system high pressure pump and injectors, which are costly engine components. Merely increasing the amount of fuel gives higher exhaust temperature and excessive thermal load on the engine's component parts as a result. Power output is most often not very good either. The simplest tuning boxes often have an adjustment screw where the user can adjust how much the sensor distortion will be. This means that you put the responsibility to assess the engine's limitations and the current load in the hands of the customer, which will be a virtually impossible task.

Easy installation (single connector on the engine, can sometimes be difficult to access). Can just as easily be removed.
Minor performance increase and higher load on the engine components.


>> Read more about Tuning Box functionality

Chip Tuning
Reprogramming the controller or as it is often called Chip Tuning or ECU reflash, means that you change the control program in the engine control unit to deliver more power. In this case, it is possible to change all the parameters required by the engine management control from the start. However, it is in principle very difficult to add functionality to existing software.
Easy installation, can often be performed via the vehicle's diagnostic port
Can be "overwritten" and disappear after service and software updates. New features can not be added. Difficult to restore.


The principle of the piggyback is that an extra control unit is connected in series with the vehicle control system. It allows you to change all the engine parameters as the default system control plus additional sensors, actuators and functions can be added. Depending on how sophisticated the system is, the installation procedure may vary. Some systems are designed to be connected by soldering into the wiring harness. A more sophisticated system fits directly to the ECU connector.
Can control all engine parameters. Does not affect software upgrades. Can be uninstalled.
More advanced hardware.


We at STT Emtec have chosen to work with this method and all our modern systems connect directly to the vehicle controller by contacts.


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Visiting address: Njurundavägen 16, 862 40 Njurunda, Sweden. STT Emtec, engine and emission technology.