Stock turbo, manifolds, throttle body, cobb dp, ets hfc and CB, boost pill, tune.

Nothing else was changed after the LICP (i.e. tune, other mods,etc.) install. Logs were taken at 2 different locations and by 2 different people.

Other than ambient air temps/density that can explain the variance in AFR?

i.e. virtual dyno parameters.

 

Well you can see that the 2nd set of runs held peak boost for longer so that could affect it somewhat around 4-5k, but ambient temps and density could easily affect the AFR levels. You said they were done at different locations, is there a noticeable altitude difference between the two places?

 

Before was in Benica, CA and after was in Chico, CA.

 

Typically runs done right after warming up the car will show leaner, then as the car heats up it will typically start showing richer AFR on the gauge. This could be a wideband sensor thing or just the car running richer when its hotter. For boost leaks it would typically run richer than expected as air counted at the sensor isn't making it to the engine but the ECU is still trying to deliver the full amount of fuel. Pre turbo leaks between the sensor and turbo inlet could lean things out as the airflow past the sensor is less because it's cheating and pulling in unmetered air.