PSR Parts - External ECU Remap Tuning - BMW G20 G21 320i PSR-ECU-BMW-G2X20i

Unlock the full performance of your BMW G20/G21 320i with the PSR Parts External ECU Remap Tuning, delivering 255HP and 390Nm of torque. This advanced tuning solution enhances power, throttle response, and drivability without modifying the original ECU software, providing a safe, reversible, and engine-specific upgrade.

Unlike conventional “PowerBox” units, which rely on limited sensors and often fail to properly monitor turbo pressure or engine load, the PSR External ECU is a fully advanced engine management system. Using CANBUS and camshaft signals, it calculates the optimal torque and power output across all driving conditions, ensuring precise, reliable, and efficient performance without compromising the engine or OPF/DPF systems.

Key Features & Benefits

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

• Dynamic Fuel Injection: Extends injection duration for improved low- and mid-range torque

• Turbo Boost Optimization: Adjusts turbo spool-up and regulates boost pressure for stronger acceleration and higher power across the rev range

• Load-Dependent Power Delivery: Dynamically adjusts fuel and torque based on throttle input for smooth daily driving or aggressive performance

• Fuel Efficiency Gains: Fine atomisation of fuel delivers maximum horsepower with minimal consumption

• Safe & Reversible: Installation does not modify the original ECU and is fully reversible

• 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 turbo delivery

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

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

5. Load-Dependent Adjustment: Fuel and torque dynamically adjust to throttle input

6. Fuel Economy Optimization: Achieves high performance while improving efficiency

Specifications

• Output: 255HP / 390Nm

• Installed in the engine compartment for persistent tuning

• Fully reversible and non-invasive installation

• Safe power optimisation within engine limits

• Improves throttle response, torque, and overall drivability

• Compatible with BMW G20/G21 320i 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 320i – Sedan (2019+)

• BMW G21 320i – Touring (2019+)

Designed specifically for BMW G20/G21 320i petrol engines.