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Chip tuning refers to changing or modifying an EPROM chip in a car’s or other vehicle’s electronic control unit (ECU) to achieve better performance, whether it be more power, cleaner emissions, or better fuel economy.
As technology advanced, so did the electronics that go into cars. The ECU in a modern automobile, together with advanced engine technology, makes it possible to control many aspects of the engine’s operation, such as spark timing and fuel injection.
The ECU may also control electronic throttle control (drive-by-wire), valve timing, boost control (in turbocharged engines), ABS, the automatic transmission, speed governor (if equipped), and the electronic stability control system.
These “bolt-on” modifications alter the way that the engine flows, often causing the air to fuel ratio to change. Without re-mapping the fuel tables, some of the performance gains from the modifications may not be realized.
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