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You need to read the directions and read up a lot, because if you do this wrong you could really fugg up your car.
The high and low settings are based on your thorttle input. You can store two different fuel maps based on throttle input (this is why the AFC sucks, JUST TWO!). So for example you can set the low setting at 30% and the high at 60% (i recommend these values anyways, on a DSM atleast). So at 30% and less throttle it uses one fuel correction map, and above 60% it uses another fuel correction map. Inbetween it makes its own decission on what to use.
I've never tuned one on an SR/KA yet, but from what i understand if you are running 370cc injectors on the KA, in order for them to be used like stock then you need to tune both the high and low fuel settings at -27% points accross the board (lean out the air/fuel ratio).
If you dont know how to do this please back away from the S-AFC and start reading something, anything.
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