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No, they don't spray all the time. They only spray when you tell them to, and that has nothing to do with the ECU. The meth kit should have its own controller that you tell when to spray and how much to spray based off your boost levels. Mine was set to start spraying at 16psi and only spray 100% at 26psi. The size of the nozzle and the way you tune it also affect how much is sprayed. The only relevance there is between an alky/meth kit and a standalone is the ability to add a safety mechanism.
I recommend considering E-85, since it costs a lot less, is far less dangerous, makes more power, and doesn't require a separate trip to Home Depot (alky) or wherever you plan to get your meth. The downsides of E-85 would be that not every station carries it, gas mileage suffers by 30% (worth the lower cost, but maybe not worth the less miles per tank if you drive long distances), and although you can have a backup tune for 91oct, you don't want to mix them.
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11.51@115.12 - PMI
11.62@118.60 - Bandi
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