I just installed a TSP 224/228 LSA 112 into my 2002 LS1 automatic Camaro. The Camaro is basically stock. I tune the base running airflow, primary VE and the MAF calibration tables. The car is running fine, but I notice the AFR dropping while idling. The AFR with the stock cam was about 14.5 at idle. With this cam, the car?s AFR drops into 13.5 range when it idles. When I drive the car, the AFR is around 14.4 and when I come to a stop the AFR is about 14.3. If I continue to idle it will drop to 13.6. The strange part is the reason for the drop in AFR appears to be an increase in the LT trims. They are about 2 when the initial idle AFR is 14.3 and then over time increase to 12 and the AFR drops to 13.6. I do not know why. I tried recalibrating the MAF at the idle air flow frequency, but it does not appear to have any effect. Any thoughts would be appreciated.
John