The BMW N54 engine found in the 335i is a highly tunable platform, and upgrading to a single turbocharger setup is a popular modification among enthusiasts aiming for higher power levels. Here’s some information about the single turbo N54 335i setup:
1. **Single Turbo Conversion Kit**: Several aftermarket companies offer single turbo conversion kits specifically designed for the N54 engine. These kits typically include a larger turbocharger, exhaust manifold, downpipe, intake piping, and associated hardware necessary for installation.
2. **Turbocharger Options**: There are various turbocharger options available for the N54, ranging from smaller units for quick spool and improved low-end torque to larger units for maximum top-end power. Popular turbocharger choices include the Precision 6266, BorgWarner EFR series, and Garrett GTX series.
3. **Exhaust Manifold**: Upgrading to a single turbo setup usually requires replacing the stock exhaust manifold with a new unit designed to accommodate the larger turbocharger. These manifolds are often designed for improved exhaust flow and optimized turbo placement.
4. **Downpipe**: A custom downpipe is typically included in the single turbo conversion kit to connect the turbocharger to the rest of the exhaust system. Upgrading the downpipe can improve exhaust flow and reduce backpressure, further enhancing performance.
5. **Intercooler Upgrade**: Increasing the size or upgrading to a more efficient intercooler is often recommended when upgrading to a single turbo setup. This helps keep intake air temperatures low, improving engine efficiency and reducing the risk of knock.
6. **Fuel System**: Upgrading the fuel system is essential to ensure adequate fuel delivery to support the increased power levels of a single turbo setup. This may involve upgrading fuel injectors, fuel pumps, and adding additional fueling components as needed.
7. **Engine Management**: Tuning the engine control unit (ECU) is crucial to optimize fuel and ignition timing for the new turbocharger setup. Custom tuning software or piggyback engine management systems are commonly used to adjust engine parameters and maximize performance safely.
8. **Transmission Upgrades**: Upgrading the transmission components, such as the clutch, flywheel, and transmission cooler, may be necessary to handle the increased torque output of a single turbocharged N54 engine.
9. **Cooling System**: Upgrading the cooling system with a larger radiator, upgraded cooling fans, and an oil cooler can help dissipate the additional heat generated by the higher power levels.
10. **Dyno Tuning and Testing**: After installing a single turbo setup, it’s essential to have the vehicle dyno-tuned by a professional to optimize performance and ensure reliability. Dyno testing allows for fine-tuning of the engine parameters to achieve the best possible power and torque output while maintaining reliability.
As with any significant engine modification, it’s crucial to consider the potential impacts on reliability, drivability, emissions compliance, and warranty coverage. Additionally, always consult with experienced tuners or automotive professionals when planning and executing modifications to your vehicle.
