pre turbo injection installed

[raddy]

finally I installed additionall nozle before turbo, in addition to intake nozzle. Engine is ca18det, 444cc fuel injectors, T3 turbo, FMIC. Pre turbo nozzle is 2.8GPH size, feeded by 150psi shurflo pump. Nozzle position is just before compressor intake (about 10cm before comp. wheel), nozzle is angle mounted, directed water flow to middle of comp. wheel (no turns or wall in water stream). Injected mixture is 80%water to 20% ethanol.
Intake nozzle already significantly moved knock treshold away, so Im interesting how pre turbo injection will work.

What can be interesting, I will test lower octane fuel (95RON instead of current 98RON), as with 98RON I must advance ignition really much to avoid missfiring and still can go to 1.2bar (with 98 fuel) without audible knocking with single nozzle at intake. My idea is that with 95octane fuel I will be still out of knock area at this boost level (specially with additional pre turbo nozzle) and get better (more advanced) ignition timing opposite to 98octane fuel. At least it can save money for unneccessary expansive fuel...

Some driving results will come later today...

Radovan

EDIT: forgot to say that I have no second check valve yet (ordered already), so I use one check valve for both nozzles. Intake nozzle is fine, becouse it is just few cm away from check valve, but pre turbo nozzle is about 1m away from check valve, so after pump is shut off, pre turbo nozzle continue to deliver small amount of water until 1m of hose is empty. Do you think that this can be problem for turbo or I can using it until second check valve arrive?
Thanks