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Old 08-15-2010, 04:45 AM   #1
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Anybody ever tried their systems?
Seems like a good system and ease of installation, my buddy with a 240 is encouraging me to put the same system on my car but most of you guys are using different ones or DIY it yourself.
So, any opinions would really help!
Thanks
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Old 08-15-2010, 06:46 AM   #2
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The pump he is using is the same pump that everyone is using, aside from alkycontrol maybe. He is selling DO nozzles. I haven't looked into his prices, aside from the 250 psi pump, which Rodney offers for less than anyone else, with the NPT female instead of the pushlock. He has been removed from a few sites, but that is not something to get into here.
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Old 08-20-2010, 05:11 AM   #3
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Thanks Dust for the info, BTW, I'm interested in their Stage2 Progressive kit.
Anyone else?
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Old 08-20-2010, 02:07 PM   #4
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Basically, there's three basic types of water-injection kit currently on the market:

The first uses a simple on-off pressure switch. Whenever your MAP is above a certain threshold, the pump runs and water flows at a constant rate. Most everyone's "Base" or "Stage 1" kit is of this design.

The second attempts to vary the flowrate in response to MAP by controlling the voltage to the pump. Most everyone's "Progressive" or "Stage 2" kit is of this design. This is a step in the right direction, though there are a couple of problems. First, they typically respond only to MAP, and not RPM. So while the engine's theoretical water requirement would double from 3,000 RPM to 6,000 RPM, flowrate would stay the same if MAP stayed the same. And the second is that PWMing the pump motor isn't a great control scheme. For starters, flowrate through a nozzle isn't proportional to pressure- a doubling of pressure produces only about a 25% increase in flowrate. And for finishers, there's a pretty limited range to work in- generally the nozzle won't atomize properly below, say, 50 PSI, and since the system is open-loop, the pump tends to hit its self-limited max pressure long before the controller gets to 100% duty cycle. So it's a good try, but only marginally better than a static system.


The third type of system looks at actual engine load, either RPM vs. MAP, just just monitoring the fuel injection pulsewidth, and uses this not to modulate the pump motor, but to drive a "high-speed valve" (essentially, a stainless steel fuel injector). This gives you pretty damned good control of water flow. The downside is that these systems are hellishly expensive, and the only company I can think of doing this currently is Aquamist.
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