the water/methanol mix is wel known mixture to spray on the intercooler, as the alcohols take from the heat ... i am new to diesels, but not to engines, i have high powered drift nissan silvia s14 and alot expirience with gas turbo engines and from my expirience the water/alcohol spray is better than spray only water ... it cools the air better. I am not sure i can explain it in english, but as the mixture evaporates from the cooler, it takes alot of heat in exchange. I read somewhere about the propane injection, and i was thinking to try it, but if you say its not safe, i will do more reading before i try.
throw your gasser knowledge out the window..
diesels are 100% different..
water/meth (in 50/50 quantities) when sprayed into the INTAKE actually reduces intake temps ALOT.. you are gonna see bigger drops from spraying it INTO the intake, rather than ONTO the intercooler.
as the water/meth is evaporating in the air, it is taking heat out of the air as well.. it does the same thing INSIDE the intercooler as it does when you spray it on the outside, just much more efficiently.. the heat is being transferred directly from the air, to the methanol, instead of thru a big piece of aluminum first.. the more things the heat has to pass thru before being expelled back into the ambient air, the less efficient the heat transfer is.. trust me, it works better when you spray it in the intake air, rather than across the intercooler.. plus, it cleans your engine as its being injected.. it really is better to run your water/meth charge into the engine.. i would run my sprayer nozzle about 3-12" away from the opening to the intake manifold..
and propane IS SAFE for most diesels, just not these IDI engines we run.. if you were running a TDI instead of an IDI, i would say to go for propane, but, being that you are running an IDI like the rst of us, i would AVOID PROPANE AT ALL COSTS, unless you feel like shortening the life of your engine.. being that IDI engines have much higher compression than TDI engines, the propane is ignited way sooner than it should be ignited, leading to detonation, piston erosion, and eventually, engine damage..
being overfueled, and running nitrous is MUCH SAFER.. plus, the nitrous acts as a chemical intercooler as well.. nitrous is very safe on ALL DIESEL ENGINES.. not just direct injected ones..
if it were me, i would use a large fuel pump so i had more fuel than i could burn while boosted up, and run a decent shot of nitrous on the engine..
you really dont need a water/meth system unless EGTs are really high.. i dont think you will see issues with temps, unless you go with a REALLY BIG injection pump... there is no reason NOT TO RUN methanol injection if you have it tho.. i would still run it into the intake tho, not over the intercooler..
just like those nitrous intercooler spray bars, if you take the nos running thru that, and route it into the intake instead, it would make for much larger gains..
if you want to cool your intercooler, dont screw around with methanol, shoot liquid Co2 over that thing.. it will be frosty cold in seconds!!