| using an adjustable pressure switch. An add on uses another switch and another set of nozzles to allow another level of water at a higher boost. Problem is I want a system that meters water based on the amount of boost and airflow which this system doesn't do. I'm not knocking the system. If there weren't other choices it would be a good one. However I do knock the price. Every single item in the Z1 system can be bought at my local Kellog agricultural supply wearhouse for a grand total of about $300. I think for a system that doesn't use a brain to take MAP and (MAF or injector pulsewidth) signals and either meter water through a high speed valve (like an injector) or a really fast variable pressure pump, $595 is too much. The snow system(and I haven't even look at the MWS system yet) looks to me to be a lot more refined and has an embedded processor to meter water out on at least MAF. According to Dan, they convert the MAF to airflow through the same non linear table, so this is a good step forward. Lacking MAP is not the end of the world, but would be nice. If the MWS can do 3-d mapping and use both MAF and MAP, then I'll probably get that even though it's $100 more. I'd probably still prefer a system that uses a high speed valve as the accuracy is a lot easier to obtain than that with a pump. With the pump, variations in voltage, temperature, and many other factors can effect the rate slightly. Additionally, controlling water flow with a variable pump will have a lag time that is almost non existent in the high speed valve version. However, high speed valves can fail and they can stick open on rare occasions which would be really bad unless there were other safety measures. The Snow people claim they use the variable pump instead because it's more reliable. It may be. It is certainly a lot simpler. There are a lot fewer components but it does a lot more than the non brain systems.
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15:47:27 12/20/05
