Every Z is different with mods, and the AFR will never just be lean or just rich - it's usually a mixture of both throughout the powerband. Before my tune my car was running really lean in the low-end, high 14s/low 15s. After 3K RPM, the AFR got richer and hit 13s. But after 5K RPM the mixture got pretty rich and was in the 11s and sometimes high 10s. With my current tune, AFRs should be in the lowish-12s across the board.
I'm going to re-log the car and look for timing adjustments that can be made, as well as any possible flat-spots in the AFR (anything outside of the 12 range past 1500RPM, basically).
Edit: Also dynoing nearly a year later negates the purpose of comparing dynos, even if the temp and machine were the same.
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