as TVS said - around about 13:1 is good, as a general rule of thumb.
i was speaking to the dyno operator about what kind of AF ratios we should be aiming for, and he said
keep taking fuel out till it blows, then put a little bit more fuel in
he told me pretty much every production car on the planet runs too fat through the rev range, my guess for the reasoning behind this is to make sure the engine doesnt ping - people hate it when their car pings.
i scored about 13 hp by putting a stock falc fuel pressure reg in my car (instead of the XR6 one that came with it, as, of course, it is a EB XR6)
it had been running very rich since putting the cam in (i wish i had access to a digital camera - i would post my dyno graphs!) it was around 10:1, the stock reg leaned it out to about 12.5:1 or thereabouts, i would gain a few more hp from taking even more fuel out, but without an adjustable reg i cant, i need a new computer (thats coming soon :s6:)
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