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Old 08-31-2000, 12:46 AM   #1
Scooby Specialist
Member#: 1954
Join Date: Jul 2000
Location: Long Beach, CA, USA
1997 Impreza L/WRS

Post 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?
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Old 08-31-2000, 06:00 AM   #2
Patrick Olsen
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Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
1997 Legacy 2.5GT
1996 Impreza coupe


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
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Old 08-31-2000, 06:51 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.
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