shinjuku

Ok I intend this post not to be the subject of whether water injection is advantageous or not as this has already been covered.

My question is :

Where is the best placement for the water nozzle? b4 the compressor or just b4 the throttle body?...and why?


The nozzle is controlled by a pump at 45psi and is capable of very fine atomisation. It flows about 140ml/min at 40psi (the nozzle).

thanks
Andrew

RICE RACING

At the exit of the IC is technically the best place.

What is your set up? Where did you get the bits from?

shinjuku

why is that the best place? do you mean say like about 10cm after the exit of the IC?? so if u have a FMIC that could be 40cm b4 the throttle bady?

my setup is a pump from a marine supplier (whitworth's Nautical world) nozzle is from rasch P/L called a spraying systems SF3 fogging nozzle.
it has a boost switch to turn it on. also a solenoid in the water line , one again boost switched to prevent dribbling.
the tamk is also boost pressurised so the pump doesn't have to overcome boost pressure.

RICE RACING

It is a better place because it gives the most amount of time for the water to do it's work.

It is bit like comparing mechanical direct injection to carbs used in WW2 air planes supercharged.

The carb engines developed more power because of the heat taken out of the charge caused by the fuel evaporating, this did not happen when injecting the fuel closer to the inlet port.

The same principle applies to the WI the longer you give it to take out the heat the better it will work, when injecting at the IC outlet you can use this principle also you get more heat release potential from the water if it is injected at a lower temperature.

The benifit over this method compared to the (in front of compressor) is that it does not slow the turbo down and also it helps the flow of the air as with water the air is cooler and does not flow as good as hot air throught the turbo to the IC.

I only ran in front of the compressor as I did not run a pump system, I am converting to the pressure pump to get around this.

shinjuku

It;s interesting u mention the WW2 aircraft b/cos i believe they had the water inj placement just after the supercharger exit....i guess that's pretty much what ur proposing considering they didn't have and IC.

I lost ya however when you said:

I have emailed the details of the system I am building. If you have time tell me what u think

thanks
Andrew

shinjuku

were these were a draw thru supercharger arrangement??