FUEL UPGRADE KIT IMPREZA WRX STI Explanation of the product Application chart

Code No. 14007-AF003




Large capacity injector and fuel pump in one fuel upgrade package.




  • Designed with the latest generation BOSCH Top Feed type fuel injector. All injectors have been passed the spray test and similar performance injectors are picked up and packaged in one kit for each car.
  • Improved injector performance results in a shorter injector dead time. (1350μsec => 900μsec at Voltage 14V and Fuel Pressure 300kPa)
  • O-rings(2-pieces) and spacer(back-up ring) have been added to the fuel line connector for improving sealing.
  • Stock harness connector converter is included.
  • Includes same fuel pump in our previous fuel upgrade kit. Replacing connector and small modification of fuel case are necessary when installing to GRB/GVB. (same as previous kit)


Sealing of fuel line connector was improved




Comparison of fuel pressure and injector capacity (capacity is a calculated value)

Fuel Pressure (kPa) 250 300 350 400
Capacity (ml/min) 595 650 700 750


Comparison of fuel pressure and injector volume (volume is not guaranteed)

Fuel Pressure (kPa) 300 350 400 450 500
Volume (L/h) 12(V) 210 195 180 165 150
14(V) 260 245 230 215 200


Comparison of voltage and injector dead volume (300kPa)

Voltage (V) 8 10 12 14 16
Injector Dead Time (μ sec) 2290 1560 1150 900 730



  • Injector nozzle is conical type (1spray) which is different from our previous 2-Jet type products. Please do not use the same fuel setting data due to the difference of injector dead time and fuel injection condition.


Vehicle Model Engine Model Year Outer diameter Length (mm) HKS pump (L/h) Normal pump (L/h) HKS injector Normal injector Code No. Price Remarks
IMPREZA WRX STI GVB EJ20 10/07-14/08             14007-AF003