They are all a little pricey, but yeah I saw you can get different sizes. The size goes up quite a bit after the 380cc nozzle. I think I also saw one that was 800cc or so. When I first did the setup I wasn't sure how much water I would need, after experimenting I decided I wanted more so I drilled it out. I might even go bigger at some point but it seems good where it's at.
I would not run my car hard at the air temps you're seeing. While it is true that water really shines at it's boiling point.... because it's boiling point is much higher then alcohol it won't bring the temps down as much. Take your cooling mist jet and stock it in front of the compressor. Do a few tests with it first, nothing bad will happen to your compressor short term and many people are running systems like that with a lot more water. It will at least tell you if you're on the right track.
It's quite possible the breakup you're experiencing is due to the extreme air temps you have, or because the water isn't atomized as well running the post turbo pump driven setup. Preturbo will atomize the water much better, regardless of the system type. That alone could help drastically reduce temps and the breakup you have. An intercooler would also allow you to run less water overall which will also put less strain on the ignition.
If you don't mind possibly having to run meth also and a larger nozzle then you can see what happens before adding an intercooler, but I have a feeling with water alone you'll need an intercooler too.
Personally I recommend moving the nozzle you have right now to the front of your turbo and just see. That won't cost you any money.
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