The FSB JB4 WMI controller adds progressive water/meth injection to your JB4-tuned N54, N55, B58, EA888 or EA839 engine. It reads real-time CANbus data to map pump flow precisely against boost, RPM and load.
Integrates with JB4 fuel trims and fuel pressure monitoring for active knock suppression
Monitors pump current for fail-safe operation
Plug-and-play wiring, no extra tuning needed for basic setup
Made in the USA, built for fast road and track day use
