Boost + Carby + LPG = What Nozzle?

[Hadey65]

Hey all, in need of some help. Im running a Holden 202 turbo on a dedicated LPG (propane) blow thru carby setup and Ive recently installed a water injection kit. Im using 50/50 water methanol mix, running around 22psi boost and making about 500/550 flywheel HP. What size nozzle or how many cc of fluid should I be spraying into the engine as being its a carburettor and not injected I cant figure out exactly how much fuel Im putting into the motor to calculate a %. Any advice would be great. Also it is already intercooled with a water 2 air cooler and the nozzle is mounted just after the cooler, about 600mm before carby.
Thanks

[rotrex]

1 to 1.5cc per minute per HP is a good average number.
Depending on your ignition system and how much you are then still knock limited, you can add more that that.
So for a 500HP engine, 500 to 750cc a minute is a good starting point.
Depending on the plenum design, you might lose a lot of water on the walls of your intake plenum. this makes is less efficient.
in this case you might consider injecting pre compressor and further away from the intake.
Alternatively increase the methanol content or go direct port.