High humidity?

[hotrod]

Having spent a couple years in Guam, ( I remember a speed run or two on an abandoned air strip on the north end of the island in a new 240Z ).

I would say your assessment is probably correct. Your humidities are very high and water evaporation will be nearly zero when you are off boost or at low boost.

On a turbocharged application, even with an intercooler, there will be some evaporation due to the high inlet temps. In my tests on a TMIC on a WRX, in 90 degree weather the charge temp out of the intercooler might be 135 deg F or so. That significantly drys the air so water injected into hot charge air will still cool things off.

I would suggest you use at least 50/50 water methanol, straight water would not be my choice in a tropical climate like that.

On the pre-turbo injection, water would still work due to the high air temps reached in a turbocharger under boost, you would still get the advantages of wet compression. I would how ever delay the spray turn on a bit more than stateside or temperate climate folks because your very high humidities will do some of that for you anyway.

Let us know how things work!

Larry