Well I have been using WI for a long time (5 years) and 3 years at my current power level 472rwhp dynapack (490rwhp dynojet power) or around 560BHP.

During this time I have seen people come and go of this forum (2 years that I have been here) some going through multiple engines running at similar power levels, I use my car as a daily driver and circuit race it too, I only ever run it on 98RON octane pump fuel and run 228kpa absolute pressure (around 19.9psi gauge boost ).

I am still using the same engine block parts for the last five years ! The only things I have done is reported the engine and put in new seals after i bought the car from it's previous owner, I put down the engines longevity to WI, through hybrid stage to my final current set up (to4 FMIC, etc etc) the one constant has been the WI. I swear by it. The biggest benifit it will give you is reduce combustion chamber PMEP's (but increased BMEP's)which = less peak stress on the engine and also it gives you lower combustion temperatures + lower turbine temperatures........all these things improve reliability.

There is another thing in which I believe it improves combustion efficiency in that when the water evaporates into steam well before TDC this action helps to mix the fuel in the combustion chamber more effectivley especially when running at higher boost, in some ways I stongly believe that it can be an efficiency + power adder. The ONLY thing is that you will require a realy strong spark "CDI" to take full advantage of the WI without getting a misfire and associated power loss. This is why mixing with methanol or running straight methanol is popular becasue it does not require the spark to be as good therfore resulting in less misfires, net result is you are not getting the same thermodynamic benifits as running pure good old water.

As for my mate Croky Show me your Engineering or thermodynamic qualifications then I will listen to you over the 100's of engineers who from the begining of last century to today still use water injection to increae the performance potential & reliabilty of every type of combustion engine from diesles to the latest gas turbines, it is no band aid as he or other "experts" would have you believe.