I did some ECU logging the other day of my car, and yeah it's running lean big time as well. It gets progressively richer past 4K RPM hitting mid-13s or so. But below that I'm in the high 14s most of the time. :|
The problem with our ECUs, and this pisses me off a lot, is that they progressively adapt weeks after you've done the mods, leaning out the mixture with time. So for the first few days after an install, there's tons of power to be felt (which is why dynos also show bigger area under curve gains when installs are dynoed same day). Then as time goes on, the ECU makes some adjustments and power is lost. Same story with my 350Z, power felt great for about a week, maybe two, and then it desperately needed a tune as top-gear passing became a struggle - low-end power was diminished. 370Z is experiencing the same right now.
I'm gonna be making some adjustments to the base map and verify it. Right now it's a little annoying trying to get some decent 0-80 pulls on dead streets since cold weather is creating too much wheel-hop - but at least I know what AFR ranges I'm working with.
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