High Capacity Injectors=more horsepower?

WRXwannbe · 08-30-2000, 11:46 PM

I really don't know about this but I've seen people state that just because they bought some "high capacity" injectors ( 550cc for their L imprezas, etc) they gained somewhere along the lines of 63.xxx horepower. Is this even close to true? and if so who sells these "super" 550cc injector kits? Whats scoop?

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Patrick Olsen · 08-31-2000, 05:00 AM

Larger injectors give you the *potential* to make more power, but they won't make more power by themselves. If anything, on an utterly unchanged car, they'd probably make less power. When I say "utterly unchanged", I mean that you didn't let the ECU know in any way that you have bigger injectors in the car. That means the ECU gives the same firing signal (or whatever you want to call it) to the larger injectors as it would give to the original small injectors. So, same pulse width, larger flow rate means more fuel into the engine. You'd probably end up running extremely rich.

I think eventually the O2 sensors would see that very rich state and the ECU would compensate. I don't know if the ECU could compensate enough, but you'd end up either back at ground zero, or still running somewhat rich (which will cost you power).

Pat Olsen
rolled '99 Legacy 2.5GT 5speed sedan

HRE | giulio · 08-31-2000, 05:51 AM

unless you can get more air into the combustion chamber, why would you need more fuel? ya dont. get bigger injectors with aspiration mods.

08-30-2000, 11:46 PM	#1
WRXwannbe Scooby Specialist Member#: 1954 Join Date: Jul 2000 Location: Long Beach, CA, USA Vehicle: 1997 Impreza L/WRS WRB	High Capacity Injectors=more horsepower? I really don't know about this but I've seen people state that just because they bought some "high capacity" injectors ( 550cc for their L imprezas, etc) they gained somewhere along the lines of 63.xxx horepower. Is this even close to true? and if so who sells these "super" 550cc injector kits? Whats scoop? * Registered users of the site do not see these ads.

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08-31-2000, 05:00 AM	#2
Patrick Olsen NASIOC Supporter Member#: 120 Join Date: Jul 1999 Chapter/Region: AKIC Location: Where the Navy sends me... Vehicle: 1997 Legacy 2.5GT QuickSilver Metallic	Larger injectors give you the potential to make more power, but they won't make more power by themselves. If anything, on an utterly unchanged car, they'd probably make less power. When I say "utterly unchanged", I mean that you didn't let the ECU know in any way that you have bigger injectors in the car. That means the ECU gives the same firing signal (or whatever you want to call it) to the larger injectors as it would give to the original small injectors. So, same pulse width, larger flow rate means more fuel into the engine. You'd probably end up running extremely rich. I think eventually the O2 sensors would see that very rich state and the ECU would compensate. I don't know if the ECU could compensate enough, but you'd end up either back at ground zero, or still running somewhat rich (which will cost you power). Pat Olsen rolled '99 Legacy 2.5GT 5speed sedan

08-31-2000, 05:51 AM	#3
HRE \| giulio Former Vendor Member#: 481 Join Date: Nov 1999 Location: NY USA	unless you can get more air into the combustion chamber, why would you need more fuel? ya dont. get bigger injectors with aspiration mods.