PSR Parts - External ECU Remap Tuning - BMW G20 G21 M340D PSR-ECU-BMW-G2XM340D

Unleash the full potential of your BMW G20/G21 M340i with the PSR Parts External ECU Remap Tuning, delivering 400HP and 790Nm of torque. This advanced solution increases power, torque, and throttle response without modifying your original ECU software, providing a safe, reversible, and engine-specific performance upgrade.

Unlike conventional PowerBox systems, the PSR External ECU is a highly advanced engine management system. Using CANBUS and camshaft signals, it optimises torque and power output in real time, ensuring precise, reliable, and efficient performance while maintaining safety for the engine and associated components.

Key Features & Benefits

• Advanced Engine Control: Monitors turbo pressure, RPM, and engine load for precise torque delivery

• Dynamic Fuel & Boost Management: Adjusts fuel injection and turbo spool-up for enhanced low- and mid-range torque

• Turbo Boost Optimisation: Regulates boost pressure and turbo spool timing for stronger acceleration and higher top-end power

• Load-Dependent Power Delivery: Power dynamically adjusts to throttle input for smooth daily driving or aggressive performance

• Fuel Efficiency Gains: Fine atomisation of fuel ensures maximum performance with minimal consumption

• Safe & Reversible: Fully reversible installation with no modification to the original ECU

• Persistent Performance: Retains tuning through manufacturer software updates

How It Works

1. Engine RPM & Load Monitoring: Reads camshaft or CANBUS signals for accurate torque calculation

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

3. Injection Duration: Adjusts fuel injection via map sensor for smooth, responsive power

4. Turbo Boost Control: Regulates turbo spool-up and boost pressure for maximum pulling power

5. Load-Dependent Adjustment: Fuel and torque dynamically respond to accelerator input

6. Fuel Economy Optimisation: Achieves higher performance while maintaining efficiency

Specifications

• Output: 400HP / 790Nm

• Installed in the engine compartment for persistent tuning

• Fully reversible, non-invasive installation

• Safe power optimisation within engine limits

• Improves throttle response, torque, and overall drivability

• Compatible with BMW G20/G21 M340i petrol engines

Installation Notes

• Professional installation recommended if unsure

• Let the vehicle rest 10 minutes after opening the hood before unplugging sensors

• OBD tools may be required to clear any errors after installation

• No permanent modifications required

Compatibility / Fitment

• BMW G20 M340i – Sedan (2019+)

• BMW G21 M340i – Touring (2019+)

Designed specifically for BMW G20/G21 M340i petrol engines.