We are often asked why vehicle manufacturers don't remap their engines before they leave the factory. This point is important when considering ECU tuning for your vehicle, and there are 5 main reasons for this.
First of all, selling new vehicles with untuned engines allows the manufacturers to release new models several months later at a higher price. Although these models have identical engines, they can make them produce increased power, better fuel economy and lower CO2 emissions after a simple ECU remap. This allows them to charge more money for a vehicle that is identical to the previous model!
In addition, having an untuned engine allows for engines to run for longer for drivers who don't adhere to service schedules and who don't look after their vehicle by checking oil levels and engine coolant, for example. If the vehicle is looked after and serviced when required there will be no problems!
All new cars in some countries must have a dip in power between 2000-3000 RPM by law in order to reduce emissions. However, this particular regulation doesn't apply to vehicles once they have left the factory.
Finally, tuning an engine adds unneccesary time and cost to the production of new vehicles.