Honda/Acura Tech Honda tech discussion.

leanin out badly

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Old Jan 22, 2004 | 04:13 AM
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thats what i figured but i can't imagine it to be any good for 80 psi at an idle.
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Old Jan 22, 2004 | 06:03 AM
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you need bigger injectors. I run 12lbs with 440's and i just locked one wide open running it at 94% duty cycle. You need atleast 550"s
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Old Jan 22, 2004 | 06:28 AM
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There are alot of different theories concering sizing injectors for a particular setup. Most people think bigger is always better. Honda's from the factory are tuned with injectors reaching 100% duty cycle at redline. . . that has to count for somehting.

Although, larger injectors do lessen driveability slightly, it is definately better to be safe, rather than sorry. I'm running 720cc injectors and I'm at about 99% duty cycle at ~25psi at 8k rpm. So I personally would rather be safe.
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Old Jan 22, 2004 | 07:54 AM
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inform me on how larger injectors will lessen your driveability? (to a certain extent) im not referring to 1000cc+ injectors. just comparing 440's to lets say 720's. ive never once seen this be an issue as long as the tuner knows what theyre doing
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Old Jan 22, 2004 | 07:58 AM
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Originally posted by tegasaurus
There are alot of different theories concering sizing injectors for a particular setup. Most people think bigger is always better. Honda's from the factory are tuned with injectors reaching 100% duty cycle at redline. . . that has to count for somehting.

Although, larger injectors do lessen driveability slightly, it is definately better to be safe, rather than sorry. I'm running 720cc injectors and I'm at about 99% duty cycle at ~25psi at 8k rpm. So I personally would rather be safe.
I have never heard of any car coming from the factory running 100% duty cycle. After 95% you are almost asking for trouble. Your fuel will never spray in an even pattern. How do you know what duty cycle you are at? I know mine because my i can read it through the laptop. I could be wrong here but i think you might be confussed
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Old Jan 22, 2004 | 08:52 AM
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First of all, the larger the injector, the slower rate it opens and closes, due to the higher volume of exiting fuel. Thus making a larger injector noisier, and if the injector is opening at a slower rate this will definately have a direct effect on how fast the injector can respond to immediate changes in throttle position. Obviously, you have somewhat of an understanding of this, by the fact that you typed (to a certain extent). A change in the size of injector, period, will in turn affect that particular engine's ability to respond quickly, to change.
As well, I never said it was an issue, just definately something noticeable, regaurdless of how knowledgeable your tuner is.

And for the issue of an injector coming from the factory at 100% duty cycle. I am definately not confused, an Integra gsr, factory settings, at 0.8" of MAP pressure at 8525 rpm, the factory injectors are at 100% duty cycle. The higher the cycle you run a specific injector, the better the spray pattern gets, considering you are reaching it's maximum recomended cycle.
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Old Jan 22, 2004 | 01:21 PM
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ok wow, information out the goats but, but i'm goin to go with the hondata s200 with boost option. now i can get that from secret services, but do i order it from there and then when i go there they will install it and then tune it or what is the deal with that i'm not full understanding. thanks
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Old Jan 22, 2004 | 01:50 PM
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ok when i get all of the fuel issue stuff handled and straightened out, i've got eagle h beams and je pistons balanced everything, how many lbs am i lookin at max on this bottom end?, and will i be able to squeeze 400 hp out of it???
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