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Ecotuning: lowering fuel consumption

The real story!


Many people claim that after modifying the ecu their car is using less fuel than before the tuning. As a matter of fact they are getting fooled because they see every day an increase in mileage in the dashboard which is not correct any more. The mileage calculation has altered by the modification of the maps changed by the tuner.


More power = more fuel

Ofcourse a large increase of injected micrograms of fuel won’t make a engine run more efficient. Power has to come from something. I know many customers want maximum power and maximum mileage unfortunately that is not possible. However it is possible to make most turbocharged diesel engine run more fuel efficient but in most cases the engine won’t gain much torque with the most efficient calibration.


RPM limitation

The most often used approach to reduce fuel consumption is by reducing the rpm the driver is making or which he needs to make to cover a certain distance. The possibilities to lower the amount of rpm the driver is making depends not only on the type of engine but also the size of the vehicle it is used in. The approach for a small engine in a small vehicle is totally different then the same engine bigger vehicle.



The most easy way to make a diesel engine run more efficient is by altering the start of injection and raising the smoke limitations. The downside is that this will increase the amount of pollution like NOx and particles.


Lean burn mixture

A more complicated way to make the engine run more efficient is by changing the air fuel mixture by changing the turbo, lambda and commonrail maps. This can only be developed on dynometer which is specially equiped with a system to make measurements of the fuel consumption while driving. After testing for a few months we gathered the information to make an engine run more fuel efficient with more or less the same emissions and without harming the engine.





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