MR2 ECU (piggyback)

The Engine Control Unit (ECU) is a critical component of a car’s engine management system, which controls various aspects of the engine’s operation, such as fuel injection, ignition timing, and idle speed. A piggyback ECU is a type of aftermarket engine management system that is installed in parallel with the stock ECU to provide additional tuning options and performance enhancements.

On the MR2 Spyder, a piggyback ECU can be used to adjust various parameters, such as fuel and ignition timing, to optimize engine performance for specific driving conditions or modifications. For example, a piggyback ECU can be used to adjust the air-fuel ratio to improve fuel economy or increase power output. It can also be used to adjust ignition timing to prevent detonation and maximize power output.

One popular piggyback ECU for the MR2 Spyder is the APEXi Power FC, which is specifically designed for the car’s 1.8-liter engine. The Power FC allows for fine-tuning of fuel and ignition maps, and can also be used to control additional components such as boost control solenoids and rev limiters.

However, it’s important to note that installing a piggyback ECU can be a complex process and should only be performed by experienced professionals. Improper installation or tuning can cause engine damage or even lead to unsafe driving conditions. It’s also important to ensure that the piggyback ECU is compatible with the car’s stock sensors and wiring harness.