Re: Idle richness with 7747.

["Kevin Reynolds" <kereyn@gte.net>]

Guess I didn't state it real well, the 108 BLMs are at idle and to about 40
kpa and get about 128 in the 50-60 kpa range and keep getting leaner as the
vacuum gets lower. The reason I felt this seemed as expected is because it
seemed reasonable to me that a larger cam(not big, but more than stock for
sure) and free flowing exhaust would need more fuel at higher rpms and lower
vacuum areas than what the stock calibration was set for.

Stock pressure for the x-fire according to the manual was stated as between
9-13lbs so when I rebuilt it I set it between 11.5-12.

I haven't tried a stock chip in a while, but may pull it out for a check.
>
> << When I was running the closed loop enabled bin my BLMs where around
108, at
>  high vacuum and go leaner as the vacuum dropped. This seemed consistent
with
>  the different cam and headers/exhaust. I have been working the VE table
with
>  good success across the board, but at startup until closed loop kicked in
I
>  get the 850mv. I've been usi >>
>
> A 108 BLM doesnt indicate lean, it indicates RICH, 108 means fuel is being
> subtracted. What are you using for injectors? Do you have the constant
right?
>
> Yo have 12psi FP?? This must then be a TBI setup, which I belive runs on
9ish
> PSI, but 12 wont make it THAT rich. A vacuum leak would yield higher than
128
> BLM's and low IAC's.
>
> Have you tried thowing a stock chip in it just to see if it idles which
would
> indicate a cal mistake and not a mechanical problem?


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