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Avcs doesn't effect AFR. I tried addressing the rich dip with avcs. No bueno. The rich dip is due to an incorrect load calculation. So that leaves MAF and Load Limits. Right at 50-60 g/s on the MAF scale take away a % or two. If that doesn't work Perhaps raise your load limits a tad. Around 1.12. Uhhhh, if you're not gaining power up top it's Becuase your VE is off. Which is due to AVCS... But before you do that fix your FLKC. The ECU will just run richer and not as smooth.
Back to avcs, start by adding/removing 5 degrees to the intake cam and 5 for the exhaust. cam. Log a WOT pull. Compare where you gained power and where you lost. That'll give you an idea where to start.
Also I actually prefer shivs injection ratios with port injection restored at 5000 rpms. Keeps AFR's flatter in that 3-4K region and allows me to run more timing and intake advance in that area for better performance.
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