Mercruiser ECM 555 Computer Re-Calibration & Re-Map (ECU) - 5.0 to 5.7, and 6.2 MAG, 305 to 350 and 377MAG CID, Stock Engines Only 

Mercruiser ECM 555 Computer Re-Calibration & Re-Map (ECU) - 5.0 to 5.7, and 6.2 MAG, 305 to 350 and 377MAG CID, Stock Engines Only

Have you recently replaced a tired and worn small block stock Mercury EFI 5.0 litre engine with a replacement 5.7 or 6.2 engine that requires a OEM mapping for the larger engine. The 5.0 mapping will run lean causing severe engine damage and drivability issues. Hardin Marine can recalibrate your Mercury ECU (computer) to yield the very most of your engines power. The ECU precisely controls fuel requirements, detonation control, idle speed and RPM limitations. Allow approximately 7-10 days turn around time.

***Results will vary depending on boat design, propping, atmospheric conditions, environment and drivers. We cannot guarantee speed or plane time increases with the many different applications. MPH and power increase % are helpful rules of thumbs and are in no way guaranteed.