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There are dozens of aftermarket ECUs you can get, not just Megasquirt. Acel, Autronic, Motec, SDS, and many others are out there. Some are more programmable than others; some require you to use specific types of sensors (or even specific sensor part numbers), and others are more like MS in that you can pick and choose and re-write the programming. Or at least download different programming. And almost all of them let you adjust the look-up tables that are used to calculate injector pulsewidth duration.
Most of these systems are used by hardcore racers, in order to get the best possible power out of their engine under racing conditions. Or to fuel an engine that has been built with enough deviations from stock that the stock ECU can no longer provide the correct amount of fuel. So most of the setups will not drop in to your application without some modification. But they'll at least have names and probably websites for you to check out.
MS is at least an order of magnitude cheaper than any of the other ones that I know of. A couple of orders of magnitude, if you just get the parts and build the MS board and enclosure yourself.
-soD
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