PSR Parts - External ECU Remap Tuning - BMW G20 G21 M340i PSR-ECU-BMW-G2XB58

PSR Parts External ECU Remap Tuning – BMW G20/G21 M340i (425HP / 600NM)

Unlock the full potential of your BMW G20/G21 M340i with the PSR Parts External ECU Remap Tuning, delivering 425HP and 600Nm of torque. This advanced system remaps your vehicle’s ECU externally, increasing power, torque, and throttle response without altering the original ECU software. The result is safer, reversible, and optimised performance designed specifically for BMW engines.

Unlike standard PowerBox systems, the PSR External ECU uses multiple sensor inputs via the CANBUS or camshaft signal to calculate the optimal torque and power output in real time. This ensures precise, efficient, and reliable performance while maintaining engine safety and drivability.

Key Features & Benefits

• Advanced Engine Control: Optimises torque and power by monitoring turbo pressure, RPM, and engine load

• Dynamic Fuel & Boost Management: Adjusts fuel injection and turbo spool timing for smoother acceleration and stronger mid-range torque

• Load-Dependent Power Delivery: Power output adjusts dynamically depending on accelerator input, ensuring usability during everyday driving or full throttle performance

• Turbo Boost Optimisation: Maximises boost pressure safely for higher pulling power across the rev range

• Fuel Efficiency Optimisation: Fine atomisation of fuel improves combustion efficiency, allowing more power with less fuel

• Safe & Reversible: Installation is fully reversible with no permanent modification to your original ECU

• Persistent Performance: Remap remains after manufacturer software updates

How It Works

1. Engine RPM & Load Monitoring: Accurately receives data via CANBUS or camshaft signal

2. Torque Calculation: Measures engine acceleration to optimise fuel delivery and torque output

3. Injection Duration Extension: Fuel injectors operate longer for precise power delivery

4. Turbo Boost Regulation: Adjusts turbo spool timing and boost levels for immediate low-end torque and high-end power

5. Load-Dependent Adjustment: Power adapts to throttle input for optimal drivability and responsiveness

6. Fuel Economy: Efficient fuel delivery achieves the same or higher horsepower while using less fuel

Specifications

• Output: 425HP / 600Nm

• Fully installed in the engine compartment

• Non-invasive and fully reversible

• Safe power optimisation within factory engine limits

• Enhanced throttle response, torque, and overall drivability

Installation Notes

• Professional installation recommended if uncertain

• Allow the vehicle to rest for 10 minutes after opening the hood before unplugging sensors

• OBD tools may be required to clear any error codes post-installation

• No permanent ECU modifications required

Compatibility / Fitment

• BMW G20 M340i – Sedan (2019+)

• BMW G21 M340i – Touring (2019+)

Engine-specific tuning ensures maximum performance and reliability for G20/G21 M340i petrol engines.