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Re: AEM ams
The last thing you want to do it try to tune an AEM with a MAS on the car, it really sucks. Pretty much you goto speed density with the AEM.
The AEM doesn't use the stock O2 sensors at all. You tune the fuel maps the best you can to get the desired A/F ratio for every load cell in the fuel map, even ones you haven't or can't reach. There are modifier tables for things like coolant temp and air temp, but even if you have those tuned perfect, cars don't run exactly the same from day to day with different weather conditions, different tanks of gas, deterorating parts, etc.
You can hook the output from most widebands into the AEM or buy one with an integrated wideband. Then you can just have it in your logging, or have it actively perform O2 feedback corrections similar to a factory car. There are also some "autotune" features that can be used with a wideband, but they are mostly a waste of time. With O2 feedback and a wideband, you aren't limited to only shooting for a 14.7:1 A/F ratio like a factory narrowband car does. You can run it much lean under cruising loads to try to save gas. You can also use it under boost to adjust fueling, but you have to be very careful, you don't want a bad O2 sensor, burned through wire or malfuctioning wideband controller all of a sudden causing an unneeded and incorrect change in fueling.
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