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I haven't checked but I would assume that the 70mm MAF calculates more airflow at the same voltage as a stock Fox meter. At 2.8 volts the Fox flows 210 and the 70mm SN meter flows 225. I'm not sure about the numbers but you get the idea. I'm just guessing here but since the meter is larger and flows more air then lets say at 4000 under wot your engine needs XXX amount of airflow. On a Fox meter that may correspond to 3.8 volts, but on the larger meter it may only be 3.5 volts. The Fox ECM applies the fuel it has stored in it's memory for 3.5 volts which is way too lean. I'd bet at wot you are in the hight 13's to low 14's for AFR. Just a guess though, and if your timing is bumped then that could lead to disaster as the power goes up. This is just a guess.
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