PiggyBack = Air Fuel Ratio Controller
Air Fuel Ratio Controllers, or popularly PiggyBacks, are used for air-fuel setting, VTEC switching points, and for other tuning. What about ECU? Usually PiggyBack is used when there is no oppotunity to set up a standard ECU.
Piggyback ECU’s are wired to work with the factory ECU. They operate in various ways. Some of them modify the injector duty cycle control signals as they travel from the ECU to the injectors. Others modify input data to the ECU (like MAF for example), effectively “tricking” the ECU into delivering more or less fuel at a given RPM.
Piggyback ECU’s are wired to work with the factory ECU. They operate in various ways. Some of them modify the injector duty cycle control signals as they travel from the ECU to the injectors. Others modify input data to the ECU (like MAF for example), effectively “tricking” the ECU into delivering more or less fuel at a given RPM.
Typical connection scheme
Here are some examples of the most popular piggy-back fuel controllers:
APEXI: AFR CONTROLLERS
We do not exactly know who was a pathfinder in this tuning opportunity but in our opinion the most productive in models brand is APEXI. There are S-AFC ( Super Air Flow Controller), V-AFC
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