I want to convert my BMW E90 320i to 320d, i need to know if it would be better off if i buy a 320d or it would be cheaper to convert.
Virgo Answered question November 30, 2024
Converting a BMW 320i (petrol) to a 320d (diesel) is an extensive process that is typically not recommended due to its cost, complexity, and technical challenges. Here’s what it would involve:
Key Components to Replace or Modify:
- Engine:
- Replace the petrol engine with the diesel engine (N47 or equivalent for a 320d). This includes all associated components like the turbocharger, fuel injectors, and intake system.
- Fuel System:
- Diesel engines require a completely different fuel system, including the fuel tank, fuel pump, fuel lines, and fuel injectors compatible with diesel.
- Exhaust System:
- The exhaust system, including the diesel particulate filter (DPF) and catalytic converter, must be replaced to suit a diesel engine.
- ECU and Wiring Harness:
- Replace the petrol engine’s ECU (Engine Control Unit) with one designed for the diesel engine. A new wiring harness will also be required to accommodate the diesel engine’s sensors and controls.
- Transmission:
- The transmission might need to be replaced or recalibrated to handle the torque output of the diesel engine.
- Cooling System:
- Diesel engines often have different cooling requirements, necessitating changes to the radiator, hoses, and cooling fans.
- Drivetrain and Suspension:
- Depending on the torque and weight of the diesel engine, modifications may be needed to the drivetrain, differential, and suspension.
- Dashboard and Instrument Cluster:
- The dashboard instruments, including the tachometer and fuel gauge, need adjustments to reflect the diesel engine’s behavior and fuel type.
- Legal Compliance:
- In most jurisdictions, you must notify the relevant authorities and update the vehicle registration to reflect the engine change. Emissions testing and certification may also be required.
Challenges:
- Cost: The parts and labor often exceed the value of the car.
- Complexity: Integration of electronic systems can be particularly challenging.
- Availability of Parts: Sourcing a compatible engine and components can be difficult and expensive.
- Resale Value: Such conversions can reduce the resale value of the vehicle.
Alternative Suggestions:
If you want a diesel car, it’s often more practical and cost-effective to sell the 320i and purchase a 320d. This avoids the technical, financial, and legal headaches of a conversion.
Virgo Answered question November 30, 2024