The control module (also known as the engine control module) is basically the brain of your vehicle. Among other things, it controls all settings for ignition and charge times and is set by the manufacturer at the factory, with economy, reliability, and manageability as top priorities.
Reprogramming (more commonly known as reassignment) allows settings to be changed to produce more power than the motor it controls. You can also get more info for engine tuning by clicking at Refined Diesel Remapping.
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One of the best things about the chip is its ability to raise the tachometer to a higher level.
It is generally accepted that the only way to get truly optimal performance from any engine is to completely redesign the ECU for that engine.
To get the best possible engine performance from your car, you absolutely need to be on a moving road and have an ignition and charge setting that works perfectly with the rest of the engine. However, since the standard system is not programmable, you will need to reinstall it to save the new settings.
For a modified vehicle, resetting the ECU can produce great results, making the vehicle more maneuverable and smoother, maximizing the benefits of all the other changes, while achieving truly optimal performance for the available specifications.