The DS25 HPFP (High Pressure Fuel Pump) upgrade for the Gen 1 B58 engine by Dorch Engineering is designed to significantly enhance the fuel delivery capabilities of BMW's popular inline-six turbocharged engine. This upgrade is particularly beneficial for enthusiasts seeking higher horsepower outputs and greater reliability, especially when using E85 fuel blends or other high-octane setups.
This HPFP upgrade is part of Dorch's "Stage 2.5" lineup, replacing their earlier Stage 2 model with improved internal components and packaging. It offers a flow potential that supports up to 750 wheel horsepower (whp) on gasoline and up to 1000 whp when paired with a +40% cam upgrade. For E85 users, the DS25 provides flow capabilities up to 550 whp, extendable to around 770 whp with the cam upgrade. The pump operates at pressures up to 250 bar, maximizing the performance of upgraded direct injectors.
One of the standout features of the DS25 HPFP is its plug-and-play design, which integrates seamlessly with the factory ECU and fuel lines. This means that installation does not require cutting or bending of OEM components, ensuring a straightforward fitment that mimics stock routing for hoses and lines. Additionally, tuning adjustments are necessary to optimize the performance of this pump, which can be easily managed through software platforms like Bootmod3, MHD, or MG Flasher.
The DS25 kit includes the high-pressure pump itself, a dedicated high-pressure line, a low-pressure PTFE line, a hose bracket, and an adapter harness. Dorch also provides strong support and a lifetime warranty, underscoring the reliability and durability of this upgrade. This pump is suitable for various Gen 1 B58 models, including the BMW 140i, 240i, 340i, and 440i series, as well as select X3 and X4 models.
Overall, the DS25 HPFP upgrade is ideal for B58 enthusiasts looking to push their engines beyond the capabilities of the stock fuel system while maintaining daily drivability. It balances high flow rates with reliability, making it a popular choice for those seeking serious performance gains.