We find out how much difference remapping a car engine makes

You might have heard of the term 'chipping' your car. The practice, also known as remapping, involves rewriting a car's electronic control unit (ECU) to allow the engine to work closer to its potential.

Manufacturers hold engines back for a number of reasons, such as allowing for countries that use low-grade fuels or drivers who ignore regular service intervals. Sometimes it's just a case of offering an engine with two different performance outputs to expand a model range.