The performance differences between KEMSO 340 and 255LPH fuel pumps need to be quantitatively analyzed based on specific application scenarios, and the comparison of core parameters reveals significant distinctions. In terms of the flow dimension, the measured conveying capacity of the 340 model at a reference pressure of 3.0bar is 342LPH±1.5%, which is 34.1% higher than that of the 255LPH version. However, in the low-load range (pressure ≤1.5bar), the efficiency attenuation rate is only 2.3%, while the 255 model has a attenuation of 8.7% under the same working conditions. The 2023 Bosch Fuel Laboratory turbo matching test shows that when the modified vehicle equipped with the EA888 Gen3 engine uses the 340 pump, the standard deviation of the oil rail pressure fluctuation at 5000rpm full throttle is 0.18bar, which is better than the 0.37bar of the 255 pump, and the air-fuel ratio control accuracy is improved by 19%.
The key to the difference in high-load durability of Fuel pump lies in the material technology. The 340 pump adopts a stacked silicon steel sheet rotor (with iron loss of 3.1W/kg) and a PPS+40% glass fiber reinforced casing. Under continuous operation at 115°C, its service life exceeds 8,000 hours, which is 60% longer than that of the 255 model’s aluminum alloy pump body (5,000 hours). The actual measurement by the performance department of Mercedes-Benz AMG shows that under extreme working conditions on the track day (oil temperature 95°C+ pressure 6.8bar), the flow rate of the 340 pump decays by 2.1% per hour, while that of the 255 pump decays by 5.6% per hour under the same conditions.
System compatibility and power consumption need to be comprehensively evaluated. The 340 pump is standard-equipped with an ISO 11856 quick socket (with a diameter of 12mm), suitable for DN12-DN20 oil pipes. However, the no-load current reaches 7.2A (while that of the 255 pump is only 4.8A). Mitsubishi Heavy Industries’ 2022 hybrid platform verification report indicates that in the 48V mild hybrid system, an additional 95μF buffer capacitor needs to be configured to mitigate current impact, increasing the system cost by $38. However, the actual test data of the Toyota GR Yaris Track Edition shows that the response delay of the 340 pump is only 45ms (110ms for the 255 pump), and the turbocharging pressure-building time is reduced by 42%.
There are intergenerational differences in adaptability to extreme environments. The low-temperature start-up performance of the 340 pump maintains a flow rate of 87% in an environment of -30°C (69% for the 255 pump), due to its integration of an 800W PTC ceramic preheating module (heating up to 20°C in 3 seconds). In the winter tests of the Yakutsk mining area in Russia in 2021, the start-up success rate of the 340 pump was 100%, while the failure rate of the 255 pump set was as high as 34%. However, in a high-temperature environment (fuel temperature 65°C), the 340 pump needs forced cooling and oil return (flow rate ≥5L/min) to maintain efficiency, increasing the energy consumption cost by an additional 12%.
Economic benefit analysis needs to take into account the entire life cycle. The unit price of the 340 pump is 395, which is 61% higher than that of the 255 pump (245). However, for modified vehicles with a horsepower of over 600:
Reduce the frequency of high-voltage protection fuel cut-off (with a daily loss of $180 per track)
The lifespan of the turbine is extended by approximately 300 hours (saving 1,250 per 1,000 hours of maintenance). Three-year tracking data from the Nissan GT-R Owners’ Club confirms that vehicles equipped with 340 pumps have an average annual power system maintenance budget reduced by 610, with an investment payback period of about 14 months.