Originally posted by SilvrEclips
If you plan on running straight water then you should probably run a nozzle less than 400ml/min.

RBracing's rule of thumb is 170cc/min per 300 hp. I was going to aim for that, though I'm not sure how much hp to expect from 21psi on a s16g with 8.8 comp.

Thanks again for your input, it's good to know some people have experience in the ~20 psi area. I still don't want to run anything besides 100% H2O. I agree with the downsides you mention, and I don't think running methanol will allow me to decrease my fuel injector duty cycles by any significant amount. Some have mentioned the octane boost available with methanol, but I think that it's also insignificant because the volume of gas in the mix is so much greater. All I'm seeking here is to reduce the probability of detonation, by removing hot spots in the engine, reducing intake temperature, and cleaning deposits in the engine. I also want to be able to boost without having to run so pig rich.