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

Code No. 14007-AF002

 

 

 

FUEL UPGRADE KIT 800/650cc for SUBARU IMPREZA
Fuel upgrade parts for SUBARU IMPREZA
Large capacity injector and fuel pump set that are required to increase horsepower.

* ECU resetting is required to change injector or fuel pressure.

 

 

●Application
  • Injector (Top feed, high impedance, compatible with short (55mm)type)
    EJ207 GRB (blue)/GDB (pink)
    EJ255 BM,BR (green)/BL, BP (blue)
    EJ257 GRF (blue)
  • Fuel pump
    GRB, GRF, GDB (BM, BR/BL, BP not tested)

 

 

●Performance

Capacity of stock injector of Impreza is for up to around 350PS. (The same limitation as stock turbine.)
Supply volume from fuel pump will decrease at high boost level.
Therefore, upgrading of fuel parts is required to replace with a big turbine.

 

Injector
(HKS vs stock)
Fuel pump
(HKS vs stock)
(left HKS; right no modification)
Injection Injector simple <prototype>

 

Components

Injector X 4
Injector O-ring X 4
Injector Flat washer X 8 Fuel pump X 1
Pump coupler X 1
Pump terminal X 2

 

 

●Injector

■Features (Concept)

  • Enough capacity for a big turbine.
  • With insulators on both ends of injector, no modification is required for installation.
  • Injection direction towards intake valve.
    ⇒ As a result, response of air / fuel ratio will improve because of less volume of fuel for cylinder from surface of port.

 

○Performance Comparison of injector volume and horsepower
  GRB stock 650cc (yellow) 800cc (Purple)
Code # 16611-AA720 14002-AF002 14002-AF001
Injector volume 525cc 650cc 800cc
(Full injection capacity)* 570cc 730cc 850cc
Max. horsepower 350 420 500
Number of injection hole 12 tapered 2 tapered 2 tapered
Turbocharger Stock GT2835 GT3037

* Tested at 300kPa. Since there is injector dead time, values at about 90% are used for the names.

 

 

●Fuel pump
  • Compatible with stock pump. It enables large capacity in tank type pump.
  • It works at high fuel pressure to prevent "fuel drop" at increased fuel pressure and high boost level.
  • As it is installed in stock pump case, fuel baffle function of stock system can work.

 

○Performance comparison of supply capacity and horsepower
  GRB stock HKS
Injector volume @300kPa 190L/h 250L/h
@500kPa 125L/h 190L/h
Max. horsepower * 350PS 500PS
Size φ38 L=114

* When calculation fuel pressure is decreased, supply volume will increase and calculated horsepower will be increased.

 

●Remarks for installation
  • Small modification inside stock pump case is required.
  • Replacement of connectors for wires of pump is required.

 

 

Injector upgrade kit of Code no. 14007-AF001
Vehicle Model Engine
Model
Year HKS pump Stock
pump
(l/h) *1
HKS
Injector
Stock
Injector
Remark
Outer dia.
(mm)
Length
(mm)
(l/h)
*1
Impreza GRF EJ257 09/02- 38 114 250 190 800cc 525cc  
GRB EJ207 07/1- 800cc  
GDB EJ207 00/10-
07/06
800cc  

 

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 GRF EJ257 09/02-14/08 38 114 250 190 650 525 14007-AF002 * Discontinued.

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HKS