Subaru EJ Recommended Injector Size by Horsepower

If you’re going to run Flex Fuel it’s recommended to use the E85 Chart.

Base Fuel Pressure		Injector Size For Pump Gas

Base Fuel Pressure		Injector Size For Pump Gas
Bar	PSI	350	375	400	450	480	515	600	640	690
3*	43.5*	1050	1050	1050	1050	1300	1300	1300	1700	1700
3.5	50.8	1050	1050	1050	1050	1050	1300	1300	1300	1700
4	58	1050	1050	1050	1050	1050	1050	1300	1300	1300

Base Fuel Pressure		Injector Size For E85
Bar	PSI	350	375	400	450	480	515	600	640	690
3*	43.5*	1050	1050	1300	1300	1700	1700	1700	2600	2600
3.5	50.8	1050	1050	1050	1300	1300	1700	1700	1700	2600
4	58	1050	1050	1050	1300	1300	1300	1700	1700	1700

*3 Bar/43.5 PSI is stock fuel pressure

These injector sizes are based on the Injector Dynamics (ID) series of injectors. Not all injectors that have the same or similar ratings can or will flow the same amount of fuel. If there is some question if the injectors you have or want to use will support the amount of horsepower you want to run, you should reach out to the injector’s manufacturer directly.