What is ECU Remapping

What is ECU Remapping

As you may have read in out ECU Remapping page more and more people are having the ECU map of their vehicles engine modified for the benefits of More MPGMore Engine Power or a combination ofincreased fuel efficiency and engine power. To answer the question ‘what is ecu remapping?’ we first need to split this question into two parts:

What is an ECU

In the context of vehicle engines the term ECU refers to Engine Control Unit, sometimes referred to as a Electronic Control Unit or Power-train Control Module (PCM). In each case the fundamental function of the ECU is to control the operation and performance the engine under its control. Physically the ECU is an electronic unit, normally based around a single chip microprocessor and associated memory and interface components housed together in a module that is located somewhere within the vehicle.

How the ECU Works

The specific operation of each ECU will be dependent on each make and model, but the basic functionality remains the same. An ECU will receive information (signals) from various sensors found within and attached to the vehicles engine and associated components. The ECU monitors these input signals and compares them against values stored in its memory / map. Subject to such as the difference between incoming signals and associated values stored within the ECU map (memory look up table), by maximum, minimum or within range of values the software of the ECU will send output signals to parts of the engine that can be electronically controlled thereby making adjustments to the engines operation until the ECU monitors that the associated signals are back within tolerances as set by the values stored within the ECU’s memory look up table/map. Unlike engine adjustments that can be made by mechanics, the adjustments made by the ECU to the engines performance are made in real time as the engine is operating. Here are some examples of the adjustments that a typical ECU can make in real time to an engine:

  • Engine Idle speed
  • Fuel air mixture ratio
  • Turbo boost
  • Turbo limiter
  • Ignition timing
  • Valve control

Now we answer the question “What is ECU Remapping?”

By connecting specialist electronic equipment to the on-board diagnostics port (OBD) our mobile ECU technicians can modify the values stored within the ECU ‘map’ memory look-up table which will adjust when the ECU will make its various adjustments to your engine. In a nutshell that is ECU Remapping.

Further Questions or Advice

First check our ECU remapping Frequently Asked Questions page If you have any further questions, need advice or just want to chat with a remapping technician. Then please give us a call on one of the numbers at the top of this page or use our FREE call-back service (found at the top of the right of this page) and we will be happy to help.

Thank You
GT Performance Staff


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0781 749 8474
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