Faeflora

iTrader: (2)

Here is a link to a nice little write up on how to determine what size and how many jets/nozzles you need for your water injection setup.

http://howertonengineering.com/tech-...ating-jetting/

I also printed the page to .pdf and attached it to this post in case the webpage goes bye bye.

Faeflora

iTrader: (2)

Assuming you haven't dyno tuned, a good way to quickly check if you're spraying to much or too little water is to take a look at your water consumption per tank.

Per the article above, if you're spraying a 50/50 mix, you want to be consuming 15-20% mixture for your fueling. The 15-20% number is what you should be spraying under boost. That means that if you have a 12 gallon tank of gas and are driving around normally on the street (not at WOT all the time), you shouldn't be using up more than 1 gallon of mixture per gas tank fill-up.

Again, this is just a real quick ballpark check to see if you're spraying too much or too little. I had issues with spraying too much so hopefully you can use this info to avoid doing the same.

tasty danish

iTrader: (9)

is it just me or does that not take into account how much fuel you're ACTUALLY injecting into the engine?

If I have 1000cc injectors for the lulz, but my engine will have all its fueling needs serviced by 500cc injectors, and I do my calculations off my injector size, the calculations for the 500cc will be spot on, and the 1000cc calculations will not. I thereby call shenanigans.

Faeflora

iTrader: (2)

Right, if you want to be precise you should be going by the fuel consumed by your average injector duty cycle while in boost, while the water injection is flowing.

Faeflora

iTrader: (2)

Another way to figure it out is to look at your dyno chart, view your hp, and work backwards via BSFC, fuel pressure, to find out CCs of fuel consumed...