I was always under the impression that the open/close time of an injector was about the same, if not slower, than a hsv... how long do you think it takes for an injector to open/close?
I know this doesn't have much relevance to the topic at hand, but I was wondering; where are you getting these extra injector controllers, who makes them, and how much are they costing you? If I have understood your post correctly, you have 3 AIC's? My controller cost me almost $300, and I have the impression that the ones you're getting are more robust. If you let me know the name/part# of your extra injector controllers I can help you figure out which would be best to use.
Whether or not a hsv is capable of keeping up at 300Hz is dependent on the width of each pulse at higher frequencies. If the duty cycle at that point is at or near 100% (which it should be), the hsv's inability to open and close repeatedly is negated. I am inclined to say a hsv would be suited for your 35-300Hz AIC.
You are right, the 0-5v output would work if you had a converter such as
this. Although it would be ideal, for obvious reasons, if you could control the hsv directly from the AIC.
I'm not sure I understand your "trick." Are you contemplating running multiple valves (one for each nozzle)? Or are you suggesting each nozzle be at a different max flow rate? I wouldn't recommend this, just because it's so much more difficult to detect a failure when you have multiple nozzles.
You're right about the corrosion issue with fuel injectors. However, there's an additional problem; i don't think fuel injectors are designed to operate at high pressures (100+ psi), which is important because the meth/water droplets need to be small enough to vaporize completely by the time they reach the combustion chamber. For some reason, either fuel doesn't need to be as atomized or pressurized... I'm honestly repeating what I've heard concerning this matter though, so don't take my word as gospel.
Are you actually running extra fuel injectors? If so, how many, and for what purpose? Fill me in on some of my questions, and I'll help you make a decision from there.
Btw, I normally hang out at nasioc.com and wrxtuners.