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I wonder if it would make the mixture too rich at mid throttle. My thinking is the lighter spring will allow the slide open a little farther at any given throttle position where the slide is in play thus acting as if there was a slightly larger jet due to the needle being open farther.
I don't see how that could make it richer. At the same time the needle is pulled up, the slide is opening to allow more air. Seems to me that the possibility of surging (or total loss of control) is the only downside.
Because the slide and needle could be open at a slower RPM given that less vacuum is needed to open them thus supplying more A/F than required for that given RPM.
Ah, I see what you mean. Still, I think a case could be made for just the oposite effect. If the slide opens early, air velocity might not be sufficient to pull the additional fuel needed to maintain proper mix from the metering circuit. In that case, it would run lean. It will be interesting to see the dyno results on this mod.
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
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