Water / Alcohol Injection

[TonyJZX]

Let me be clear on how this 'boost' is implemented.

Is there a button on the steering wheel you hit to be able to inject the mixture when you want to do a quarter mile run for example?

T.

[Cal]

Let me be clear on how this 'boost' is implemented.

Is there a button on the steering wheel you hit to be able to inject the mixture when you want to do a quarter mile run for example?

T.

The water is started by a solnoid. A hoobs switch or the ECU is set up to fire the solnoid when you want the water on. Mine comes on at 4psi and stays on until redline. So when you are into it, it's on all the time.

Cal.

[TonyJZX]

How big a reservoir would you need? And you guys mix up your own ethanol/H20 brew?

T.

[Cal]

How big a reservoir would you need? And you guys mix up your own ethanol/H20 brew?

T.

I just use water. I have a 5L bottle in the boot (pump is there too). On boost mine uses 190mL\minute. So on the track I should get about 25 mins before needing a refill.

Cal.

[Norbie]

25 minutes assuming you're on boost constantly. More likely it will last twice as long as that.

Tony: you want to mix methanol with the water, not ethanol.

[Datman]

Cal....did you get the car tuned on the dyno after installing the kit? What you are describing sounds like combustion quench. It should only be a problem when the kit comes on, as revs/boost increase the engine will tolerate more water.

You may need a smaller nozzle, the down side to that of course is you will be feeding less water in the upper end of the rev range - with "on/off" style systems it's always a comprimise (sp?).

[Cal]

combustion quench.

I'm not familiar with that term?? I really wanted an Aquamist, but with an unknown outcome the price is very high. The car has been on the dyno twice with a total of about 8 hours spent. I get the cough when the water comes on almost every time, but it is less ovbious as the temps rise as one would expect. I was surprised it did it further up the rev range though.

Cal.

[psi999]

Just keep your foot in it then cal .

sounds like a dual system might be a better option, small charge for low boost and another charge for big boost (with both running with big boost). might be able to rig it up with your current setup.

[boostking]

Just keep your foot in it then cal .

sounds like a dual system might be a better option, small charge for low boost and another charge for big boost (with both running with big boost). might be able to rig it up with your current setup.

I was looking at this kit. I think i will upgrade to it during Summer. http://www.coolingperformance.com/ca...83/1674784.htm
Not buy the whole thing but just the upgrade kit.
Do you think it will make a difference?
Thanks

[Datman]

Combustion Quench is actually "putting out the fire" in the cylinder....too much water and you don't get proper ignition when the spark plug fires. As your boost/revs rise you are putting more air and fuel in the cylinder so the percentage of water is less in comparison to air & fuel. This doesn't really explain why it's happening further up the rev range though.

Also as your temps rise, the water is evaporating faster, again meaning less water is actually getting to the cylinder in liquid form.

The only way to stop this with an on/off style system is to either;

1. Run a smaler Nozzle.
2. Start the injection later in the cycle (difficult with positive displacement superchargers - they built boost too quick)
3. Run an electronically controlled system. With fast boosting applications we recommend our MAF system which controls the amount of water according to the amount of airflow.
4. A dual system may work.....but if your building boost too quickly, it won't help much.
5. Use an RPM trigger in conjuction with the pressure switch to trigger the system.

What RPM is the system coming on at?

[Cal]

What RPM is the system coming on at?

Right on 4000rpm.

Cal.

[BigMuz]

I would add alcohol to the water until it stops bogging :D

Muz

[Datman]

Cal.... IF I have read all your posts correctly......you have your system coming on at 4psi boost which is at 4,000rpm?

If that's the case, Bigmuz' Idea has merit. You could run a 50/50 water Methanol mix which should help with the bogging problem. If that doesn't work, you will need to go to a smaller nozzle or set the system to come on at around 6psi. Neither of these alternatives are ideal, but that is the compromise you have to make with on/off style systems.

Mark.

[Cal]

Thanks Mark. Where can you buy methanol from? How combustable is it? I will have it in the boot with the battery, but I suppose it is 50/50 with water. I did hear a negative to using it, but I can't remember what it was. Wonder if it will be a problem putting it through the supercharger.

Cal.

[Datman]

The fact that it's mixed with water makes it safer, the flash point is prety safe. I know the guys in the states use it all the time. To the point that the manufacturers of Boost Cooler are planning on offering a lifetime warranty on their systems if you only use their "boost Juice" - which is a 50/50 water Meth mix which they have made for them in a lab in the US.

Not sure where you can get it from in Brisbane though.

You wont have any problems injecting pre SC.