ASNU Fuel Injection

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West Performance Fuel Injector Service – Fuel injectors cleaned, balanced and calibrated

West Performance now offers a unique solution to blocked or aged fuel injectors. Our intensive cleaning process restores your injectors to an as-new state, improving fuel flow and increasing engine performance.


The purpose of cleaning and flow-testing is to:

  1. Remove any contaminants inside or outside the injector that impede fuel flow or degrade fuel spray pattern.
  2. To accurately measure each injector’s fuel flow ability.
  3. Acquire quantitative data on injector performance the vehicle owner can use in matching injectors or tuning the engine’s fuel system.


Any set of fuel injectors will benefit from West Performance clean and flow service, This is even true of new injectors because the individual-injector and system-total fuel flows must be known for performance tuning purposes. It is not uncommon for a set of original equipment (OE) injectors to have an unacceptably wide range of fuel flow and it’s possible to even have new injectors that do not function properly. West Performance’s standard testing process identifies those problematic injectors.

The test process is as follows:

First, your injectors are installed on West Performance’s ASNU computer-controlled injector flow-testing equipment. A unique, non-flammable, fuel-like test fluid is pumped at a precisely-controlled pressure through the injectors while they are pulsed by injector-drivers built into the equipment. The volume of fuel passed through the injector is accurately measured for a set amount of time and from those figures, fuel flow is derived. During the flow- test, the injector spray patterns are visually inspected and analyzed, photographed and analysed.



After the initial flow-test, your injectors are transferred to an ultrasonic cleaning machine and connected to injector drivers. They are submerged in cleaning solution and pulsed while being subjected to ultrasonic waves. The combination of the solution and the ultrasound aggressively clean the internal and external parts of the injectors.


Test & Conclusion:

Finally, the now-clean injectors are reinstalled on the flow-tester and run again. At the conclusion of the test, a printed report is produced. This report lists: fuel flow rates before and after cleaning, and spray pattern assessments for each injector tested. Also included is the “system balance” number which is the flow difference, expressed in a percentage, between the injectors having the highest and lowest flow rates amongst the lot of injectors tested. The system’s total fuel delivery in along with a computation of potential horsepower is included.