Diesel, propane and water?

[Bikenuts]

I have a Toyota Surf with a 3 litre turbo diesel, the engine currently runs 130bhp @12psi without an intercooler, I?ve fitted propane fumigation but find the power gains I can achieve limited by the onset of knock and high EGT (1350f + / 825C+) as there is no space for an intercooler without extensive body mods and / or miles of pipe work I was considering trying water injection. Does any body have any experience with this sort of set up? What sort of water flow should I be starting with? ( I live in the north of England ambient temp 32-64f / 0-20C)

Cheers

Matt