Piggyback Tuning Systems
When flash software, a stand-alone replacement, or a chip tune is not available for your ECU, a Piggyback (PB) system 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.
Manhattan, Brooklyn, Bronx, Staten Island, Queens, Westchester, Long Island
AEM F/IC FIC
The F/IC gives users with OBD-II race vehicles and non-factory forced induction systems the ability to retard ignition and deliver accurate amounts of fuel without the need for outdated FMUs or “boost hiding” controllers. This system works parallel to the factory ECU preventing tuning limitations due to complex factory timing patterns. 21x17 maps with configurable load and RPM breakpoints are easily accessed with the F/IC's Windows-based tuning software. The F/IC draws power from PC USB interface for quick and easy calibration changes.
The GReddy e-manage Ultimate is as close to a stand-alone management system as you can get while maintaining the best features of a "piggy-back" engine management: an economical price, the use of existing sensors, and the ability to easily alter factory settings without having to tune from scratch. Many Plug-N-Play harness adapters are available.
APEXI NEO, AFC, V-AFC, V-AFCII
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, 8-points or 16-points RPM Fuel Setting Modes, RPM range: 500-9950 RPM, Genuine Standard VTEC Control (Honda/Acura) applications, VTEC control parameters based off engine RPM and LOAD, Simplified one-step VTEC unmatch correction setting, Flash memory retains setting data if battery is disconnected. Many Plug-N-Play harness adapters available.