Peak and hold vs. Saturated injectors

[Greg Hermann]

>It's finally time to buy the injectors. Horsepower, boost, and RPM
>requirements (plus a bit of overhead) dictate 105 lbs/hr units. I believe
>these will be low impedance units. Does this correlate to peak and hold,
>or saturated style injectors?
>
>I'm using an electromotive driver, so low impedance isn't a problem. What
>I'm primarily concerned with is idle quality with the large injectors.
>I've heard that saturated style have a longer minimum pulse width,
>relative to peak and hold style. Anyone have info on this?
>
>Also, what is the best angle to weld the injector bosses into the manifold
>at? Within the mechanical limitations of a Chevy big block, should I be
>aiming as close to the back of the valve as possible?
>
>Are there any injector mfg's that do a better job than others at
>atomisation? I've located 160 lb/hr units, but would prefer to get closer
>to my actual requirements, so as not to compromise idle too badly.
>
>- Clay

With an electromotive driver you will not have a snowball's chance where
the sun don't shine of getting those injectors to idle. I believe that if
you read the emotive literature (if they give you anything meaningful) that
the minimum incremental change you can make to injector pw with their ecu
is 64 us. I suggest that before spending ANY more money, you run some
calculations, and figure out what minimum % change in AF ratio you would be
making at idle!! (Even if the injectors would give repeatable flow at the
very short pw you will need. Pretty revealing!

Greg


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