Thread: Using water injection with N/a engine.

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You will not lose HP. If you have absolute proof, please share your results with me. However based on my experience, HP will not be lost.



While this is true, its not the only thing water injection does. As I will explain later.



Actually, while water itself is inert, when throw in with a hydrocarbon combustion reaction, it actually helps play an important part in the process. I higher power, forced induction up to half of the air can be replaced with water.

I don't mean to sound like an ass or anything but I don't really want to get into the actual chemistry and physics behind the whole process because I don't think my explanation will be of much use to you guys.

Think of the following scenario: you have an ecu that retards timing based on knock count, if you introduce water or water/meth into the equation you can reduce knock not because it lowers the charge temp, but it actually reduces the temp in the compressed air/fuel mix pre-determined by your compression ratio. Less knock = more timing = more power.

well you can run more timing but what if you are already at the point where adding timing doesnt produce any more power? i think na guys will be at this point way before turbo thus making water injection not very efficent for non turbo setups.

if your running 14:1 comp ratio you can run a 50/50 water/meth in place of race gas. If your car can run on pump gas 93 oct there are no gains to be had and you can actually lose power.

well you might be able to run the car on pump but you would have to run essentially zero advance to keep it from pinging

In my experience you are wrong. Just because your car runs 93 doesn't mean there is more timing in the motor to be had. Some cars reach knock before MBT this is really where the advantage comes into play.

Yeah most stock guys will hit MBT before knock threshold, high compression motors, or motors that just tend to knock early such as some domestic cars can benefit from water/meth.

I don't have any more N/A sr20's laying around, and I haven't added water injection to any N/A sr20's either. Perhaps I can convince some clients to try it out and let you guys know.

This is also dependant on the motor and setup. You can only add so much timing with out a full stand alone. From my experience 3-4hp gain is not worth the trouble or time especially on a mostly stock motor imho.

on a ve this would be pointless, atleast if its put together right they require such little timing to make power that unless your running like 15:0.1 cr it would be stupid. i konw of ves making the most power with as little as 22degrees of timing up top

You know? Do you know what happens when you add more timing?