Modernize your classic BMW fuel system without replacing the factory fuel rail.
The VAC Motorsports Performance Fuel Pressure Regulator Adapter is designed to replace the factory early-style Bosch fuel pressure regulator with the aftermarket fuel pressure regulator of your choice. Whether you're restoring an aging fuel system, fine-tuning a naturally aspirated engine, or building a high-horsepower turbocharged application, this adapter provides the flexibility and precision today's performance engines demand.
Factory Bosch regulators served BMW enthusiasts well for decades, but modern engine builds often require more accurate fuel pressure control and greater tuning flexibility than the original equipment was designed to provide. By allowing the use of an aftermarket adjustable fuel pressure regulator, this adapter makes it easier to achieve consistent fuel delivery, stable air/fuel ratios, and repeatable engine performance.
For naturally aspirated engines, it's an excellent upgrade when optimizing fuel delivery for modifications such as camshafts, injectors, or engine management. On turbocharged and supercharged applications, precise fuel pressure becomes even more critical for maintaining consistent fueling under boost and maximizing engine reliability.
Engineered for a straightforward installation while retaining the factory-style fuel rail, the VAC adapter is an ideal solution for enthusiasts looking to combine proven BMW engineering with the performance and adjustability of today's aftermarket fuel system components.
Features & Benefits
- Converts early-style Bosch fuel pressure regulators to aftermarket regulators
- Retains the factory-style fuel rail
- Allows precise fuel pressure adjustment
- Improves tuning flexibility for modified engines
- Supports naturally aspirated, supercharged, and turbocharged applications
- Helps maintain consistent fuel pressure and air/fuel ratios
- Simple, clean installation
- CNC-machined for long-lasting durability
- Designed and engineered by VAC Motorsports
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Vehicle Fitment
Fits BMW vehicles equipped with early-style Bosch fuel pressure regulators, including:
undefined 1986-1991 BMW E30 M3 (S14B23, S14B23 Evolution, S14B25 Sport Evolution)
undefined 1987-1990 BMW E30 320iS (S14B20 - Italy & Portugal models)
Also compatible with custom BMW S14 engine swap applications using early-style Bosch fuel pressure regulators.