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What is ECU Remapping and why you should do it.

ECU (Engine Control Unit) Remapping is nothing but just a fine tuning for your car that will increase its engine performance and provides greater power and torque. An engine in a car consists of an array of sensors which monitors the airflow, throttle and cranks positions and sends it to the ECU through signals. The ECU will process the information and gives the best performance under any driving condition. No hardware is changed in the car during the remapping process. Generally the remapping process takes 60-90 minutes depending upon the ECU of the car.


Reasons to do ECU remapping:


  • Manufacturers will adopt a single map policy while exporting their vehicles to various parts of the globe. They take into account the various climatic conditions, emissions and fuel quality .So no vehicle will be perfectly optimized for one individual solution. By remapping the ECU, we can get the maximum performance from the vehicle as per our needs and conditions we drive on.
  • Better Fuel economy and improved power and torque throughout the rev range.
  • The improvement ranges for turbo and non turbo engines. We will give you a brief look among different type of engines.
  • For Non-Turbo petrol engines, remapping the ECU will result in 10-15% increase in power (bhp) and 15-20% increase in torque throughout the rev range.
  • For Turbo petrol engines, remapping the ECU will result in 20-30% increase in power (bhp) and 20-40% increase in torque throughout the rev range.
  • For Turbo diesel engines, remapping the ECU will result in 25-50% increase in power (bhp) and 50-75% increase in torque throughout the rev range.
  • Engine will respond more eagerly when you press the accelerator.
  • Better Mileage.
  • Overtaking will be faster.
  • Town Driving will be much easier with fewer gear changes.
  • Improved Throttle Response.
  • Improved ignition timing.
  • Improved precise control of fuel mixture.


There are some risks involved while doing ECU remapping. One of them is Engine Damage from improper parameters resulting in hotness of the vehicle. Increased wear and maintenance requirements are another problem many face after the remapping. Reduced second hand value is also a big concern . Obviously the benefits are more than the risks involved, but in the end it all depends on how badly you want the increased power (bhp).


Stand alone ECUs are most flexible for performance tuning. But there are two problems involved with it .One of them is a lot of driving is done with the engine warming up. Cold engine needs over fueling. To get the balance right we need to shell out some extra bucks because a lot of testing is involved in it. The other problem is every parameter needs setting which is highly complicated.


Remapping the ECU definitely improves the performance of the car and especially those with turbo diesel engines. If you got some bucks to shell out, go to a professional and get the remapping done without thinking much because it is really worth the pain. We hope you liked our article on ECU remapping. Please let us know in the comments section.




About Chris Riley

I have been wrecking cars for as long as I've been driving them, but I keep coming back for more. Two wheels or four, I'm all in. I founded GearHeads.org and then built and ran AutoWise.com until selling it to Lola Digital Media in 2020. I look forward to watching AutoWise grow as part of the AllGear group.