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
(VTEC Air Flow Controller), their secondary generation S-AFCII, V-AFCII, and finally APEXI AFC NEO.
APEXI AFC NEO
APEXI S-AFCII
APEXI V-AFCII
GREDDY: E-MANAGE ULTIMATE
GReddy & TRUST digged far down in engine settings. E-Manage Ultimate is similar with usual ECU's size. PiggyBack Greddy e-Manage Ultimate works not only with four-cylinder engine but also with 3, 6 and 8 cylinders. Moreover you can plug in every cylinder for ignition correction.
TRUST GREDDY E-MANAGE ULTIMATE
AEM: UNIVERSAL FUEL/IGNITION CONTROLLER
One more interesting device was introduced famous tuning company AEM. There are 6 versions but also special production for Honda and Acura: F/IC-6. Mag Sensors (for 80-90ss) & F/IC-6. Mag Pickup Sensors (for Honda's 2000-2005 and especially for S2000).
HKS F-CON iS
F-CON iS can control the latest advanced engines. Just connect to a stock ECU with a vehicle specified harness without modification. HKS "F-CON iS" is a piggy-back ECU for fuel and ignition management as well as new features.
Functions for fuel and ignition controls are inherited from the previous model F-CON SZ. In addition to it, function to collect OBD II diagnosis data was added for correction of setting due to stock close-loop correction values when intake/exhaust parts are upgraded or boost level setting is changed.
Summary
So which one should you get. Well isn’t that the million dollar question. Answer is….who knows.
The Piggy-back computer plays an important role to control the conditions of the engine output, fuel efficiency, exhaust gas, etc
When a vehicle which intake/exhaust parts, such as air cleaner, intake piping, and/or exhaust system, are upgraded, the intake air volume is increased; however, it also lowers the ratio of fuel volume to air. The Piggy-back computer can increase the fuel volume based on the increased intake air volume and decide the best ignition timing; therefore, the maximized engine performance can be obtained. Also, in case of excessive fuel under a high load driving, the Piggy-back computer can decrease the fuel's injection volume to lead high engine output.
You can easily buy any piggy-back computer via TrueJDM directly from Japan!!! New or used!!!
Just use our contact form to tell about your car and what tuning you dream about!
And useful links for manuals on piggy-back computers http://truejdm.com/index.php?page=manuals
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