I sold some mags to a pommy bloke who told me about a magazine he saw back in pomgolia.
The gist of it was, They got a window washer bottle and pump, heated up a pair of side citters with a torch and cut/melted the end of the rubber hose. Then drilled threee tiny holes in the flat end. This was routed into the intake of the turbo. It was actuated by a hobbs switch, so it only pumped once the boost had reached (whatever level it was) He said that in the article, by doing just this, they were able to advance the timing by (I can't remember the figure) but it also gave them quite a respectable horsepower gain too. (can't remember that number either)
Its a bit of a third hand story, but you get the idea. Another bloke I know swears by using boost pressure to force water/alcohol out of a sealed resovoir, and into the intake. The inportant thing would be to use tiny delivery holes, or having the delivery tube/nozzle aimed closely at the centre nut of the turbo wheel. Thus the significant conrtifugal force would aid the atomisation of the injected liquid. Some folk proclaim that liqud into the intake of a turbo will anihlate the compressor wheel. Yet drawthrough turbo's don't seem to do this?