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Anvil is correct. Using meth/water injection, you're able to gain power by lowering the IAT charge temp through water vaporization and the increase in octane with the methanol. In order to capitalize on these benefits, the fuel and ignition timing maps need to be adjusted.
A turbo that is at the end of it's efficiency range may produce slightly more power with increase pressure but it is also increasing air temps on a larger scale too.
So to answer your question, with a non-tuneable ECU you'll run into problems when adding a meth/water injection kit. The car will run rich and bog, also you won't be able to take full advantage of the system. If you were able to adjust the timing and fuel, you would make more power at the same boost pressure, while lowering you IAT's and decreasing your risk of detonation and pre-ignition.
I run an AEM EMS V2.
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