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Holy thread derailing Batman! I tried to wade my pea brain through this thread and this is what I have picked up:
1 - Water injection is great for in cylinder cooling. I know this because I run it and it was worth an instant 45rwhp at 6lb boost in my current ride running 10.7:1 on pump gas. Also, in a previous ride I ran 18lb boost on pump gas with 24 degrees timing... simply impossible without water on that 9:1 motor.
2 - Water injection does not help economy.... regardless of compression or tune - at LIGHT THROTTLE. It obviously will help a high comp motor under load but that is nothing to do with mpg at cruise.
Point 2 above bums me out because I was hoping that water injected under lean burn at cruise would enable me to run leaner than I can now. I'm on the limit now on pump gas and what I am getting from this thread is that water won't help me push the envelope further.
In that case I'll run plasma ignition which will help make more power at a leaner mix therefore enable more mpg at cruise... plus at WOT it is worth about 8-10hp according to David Vizard tests on an otherwise optimized motor. This will mean mpg goes up but spark plugs will need replacing every oil change so economy + 1; cost of servicing - 1 haha.
Re the water - have I got it right?
I might try heating the fuel and having an ECU by-pass under throttle so cool fuel flows under power and hot fuel at cruise. IN the past I've found hot fuel makes a massive difference to emissions (seen 0% readings on 5 gas analysers for CO and HCC on several cars running heated fuel) and helps mpg if the tune can be adjusted to suit. Some cars will not adjust the tune and the O2 sensor sticks its ugly beak in... so I may remove the O2 sensors and tune around that.
Anyone else run heated fuel and optimized the tune for it? Without ecu control we used to find great results at first but over time the engine would revert slowly back to stock mpg. My theory is ECU control would fix that regression back but I've been wrong many times over many things :-) nothing to with water I know but if water does not work then we might as well talk about something that might lol
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