PIGGYBACK TUNING SYSTEMS
When flash software, a stand-alone replacement, or a chip tune is not available for your ECU, Piggyback tuning systems may be an alternative to extract any hidden horsepower and compensate for larger injectors when there is a need to upgrade. A PB is used in conjunction with the stock ECU. It interrupts (cuts into) one or more signal wires. With a simple PB, by adding, let’s say, extra voltage to a map sensor signal, the ECU is “faked” into thinking the engine is making more power, pushing the ECU into that part of the tune. There may not be much margin in a stock ECU for a simple PB to take advantage of, and/or the stock ECU may aggressively compensate, let’s say the A/F Ratio, away from your requirements back to factory tolerances. The more elaborate PBs go so far as to interrupt injectors, ignition, and O2 sensor, offering extreme control of ignition timing and fuel delivery. Although the more elaborate PBs require a different tuning strategy, there is always interaction with stock ECU. Dyno tuning a PB system is the best method to maximize power while avoiding “Check Engine” codes, poor mileage and erratic drivability.
API can tune your Piggyback System!
AEM F/IC FIC
APEXI Products
We tune Apexi Neo, AFC, V-FAC, V-FACII piggyback systems. Compatible with a broad range of automobiles, color FED display, MAF/MAP Sensor interruption for some control of fuel and ignition timing, Throttle position based signal corrections, Stall prevention function for vehicles with Hotwire sensors and open-air blow-off valves, and more!!
MAPECU3
The MAPECU3 piggyback ECU supersedes the MAPECU2 and is a major functional upgrade over the MAPECU. The MAPECU3 piggyback ECU combines the functionality of other manufacturers Air Flow Converters and Vane to Pressure Converters into the one unit, plus more. MAPECU3 tables allow real-time editing of the MAPECU3 Fuel, Timing, Auxiliary Injector and O2 Adjust configuration.
