The ejection starting system has extremely high requirements for the transient response of the Fuel Pump. It needs to increase the fuel pressure from 3.5bar at idle speed to 6.0bar required for ejection within 0.3 seconds. Take Walbro 450LPH as an example. Its dual-turbine design can still maintain a flow rate accuracy of 450L/h±2% at a pressure of 5.0bar. Combined with the ECU pre-boost mode, the pressure establishment time can be shortened to 0.25 seconds. Data from the 2023 NHRA straight-line acceleration race shows that vehicles equipped with this pump have a fuel rail pressure fluctuation of only ±0.1bar during ejection (±1.2bar for ordinary pumps), and the 60-foot acceleration time is reduced by 0.15 seconds (from 1.45 seconds to 1.30 seconds).
The material strength determines the durability. The forged stainless steel Pump casing of Bosch 044 Fuel Pump can withstand a cyclic impact load of 200MPa (ISO 16750-3 standard), and the flow attenuation rate is only 0.8% after 50 consecutive ejections, while the attenuation rate of the common aluminum pump casing reaches 5.5%. The PV value (pressure × speed) limit of its silicon nitride ceramic bearings reaches 3.5MPa·m/s, which is 300% higher than that of traditional steel bearings, ensuring stable operation at a speed of 9000rpm during the moment of ejusion. The ejection test of the Porsche 918 Spyder shows that the pump still maintains a flow efficiency of 98.5% after 800 ejections, far exceeding the original factory design lifespan threshold of 500 times.
Thermal management technology is of vital importance. The AEM 380LPH Fuel Pump is equipped with an internal vortex cooling channel. After 10 consecutive ejections, the fuel temperature only rises by 8 ° C (while that of a common pump rises by 28 ° C), avoiding the risk of cavitation. The measured data show that the vacuum degree at the impeller inlet is controlled within -0.3bar (the safety threshold is -0.8bar), and combined with low-temperature fuel (< 40℃), the ejection interval time can be shortened from 90 seconds to 30 seconds. The track data of the McLaren P1 team shows that after using this pump, the thermal decay rate of the ejection system has decreased by 72%, and the continuous ejection success rate has increased from 78% to 99%.
The matching of the electrical system determines the response speed. The PWM control system of the DeatschWerks DW300c Fuel Pump can reduce the current from 18A in the continuous mode to 6A in the ejection preloading stage while maintaining a reference pressure of 5.5bar. Its CAN bus communication delay is only 2ms (50ms for traditional relay control), reducing the synchronization error between fuel pressure and throttle opening from ±5% to ±0.8%. The ejection test of the Audi RS e-tron GT shows that this configuration improves the torque output accuracy to ±1.5% (original factory ±4%) and reduces the wheel slip rate at the initial stage of ejection by 37%.
Cost-benefit analysis shows that the initial investment for a professional ejection fuel pump kit (including controllers and sensors) is approximately 8,500 yuan, but it can reduce the clutch wear rate by 45% and cut the average annual maintenance cost by 6,200 yuan. The actual test data of BMW M4 GTS owners show that the optimized fuel system has increased the usage limit of the ejection mode from 100 times to 500 times, reduced the cost of each ejection from 82 yuan to 18 yuan, and the return on investment has reached 355%. These data confirm the core position of the high-performance Fuel Pump in the ejection system.