ESS Tuning - Piggyback Backend ECU Software (S55) - BMW F8X M3/M4


Backend ECU software for use with aftermarket piggyback controllers that control boost, etc.

- Correct AFR control for higher boost pressure. AFR target is set to 12:1 under high load/boost conditions.
- Removed top speed governor
- Increased RPM limiter (+400RPM)
- Removal of catalytic converter diagnostic functionality (for off road use only)
- Removal of cat heat cycle (for off road use only)

Models Supported
2015+ BMW F8X M3/M4 

Note: This software does not offer any performance gains without a piggyback controller installed. The piggyback ECU software intended to be used as an elevated platform, specifically designed for piggyback type devices.