[mrx79]

I would follow RICE's approach of pre-compressor injection if post-compressor temps is what's your concern.

For sure it's true that injecting in hotter air is more efficiant, but you also inject in a high pressure environment, which makes it harder for the air to change it's state. This is easier with pre-compressor because it is low(er) pressure.

With 14psi of boost post compressor, water will not boil at 100?c.

With pre-throttle injection you will have the same / worse problem, but there you have a short path inside the combustion chamber which has very high heat and pressure and water can work there.

With your post-turbo injection, water will not benefit from the low pressure before turbo and has a long path inside the chamer.

It can of course work, so feel free to try it, but just from a physical point of view i would say i'ts not the ideal position to inject water. But i never tried it by myself. So if you try and have some results, feel free to post them up... i would be curious. Sometimes reality is a bit different then simplified phyics.