David:
Very impressive i have been saving up for a WI kit. But i was going to get the Aquamist kit which is $700. "CRAZY!!" And now you come out with this. Im so glad!. I get tired of buying the C16 all the time. Anyway how many kits do you have instock and are they ready to ship as we speak?

Good Job!
Chris

 

well all I can say that I love water injection kits. What he is saying above is true. I have seen it on cars and I was shocked. $399 is great price. Now what do we get for $399? do you have pics? does it use the stock IC water tank? can we use water only ? can we control it with our piggyback systems?

Thanks

 

I want to control it with our ECUS because I dont want it to spray water all the time. I want it to spray water whenever I am under load or under number of PSI and all that while my injectors are spraying gas for the best results?

thanks

 

check the link i posted and you will answer all your own questions.

 

N2O is an oxidizer, it adds large amounts of O2 in your intake charge thus leaning out the mixture. You have to add extra fuel with the N2O or things get really hot and melt down

Alcohol is a fuel with an octane rating of 101 when used by itself. Mixed with gasoline it gives a small boost in octane. In an aplication like this the major benefit is the cooling resulting from the phase change of the alcohol from liquid to vapor when it is injected into the hot air stream going into your throttle body.

Since the Alcohol is a fuel itself, not an oxidizer like N2O you will actually run slightly richer when using alcohol injection than you would without it.

Keith

 

Partly true. You will run richer, even with water injection, which is not combustable at all.

The reason that you run richer is because when the water or alcohol changes from liquid to vapor, that vapor displaces some of the air that is going into each cylinder. The ECU fires the injector to match as much air as was counted by the MAS, but since some of the air is now displaced by the water or alcohol vapor, the A:F ratio is richer.

If you have a wideband and WI or AI, you will notice this. If you have fuel management, you can lean it out some more when running injection.

Eric

 

Plus you will be using water or alcohol to cool down the piston head instead of using fuel.

 

Yes, more details on the kit, and what kind of power were you making on the car?

 

Where could that air be displaced too? It is in a sealed pipe with only one place to go.... into the bore of the engine! With water injection, you run richer because the water actually slows down the burn of the fuel and you end up with more unburned fuel leaving out the exhaust pipe. This is why adding water injection with no other changes like raising the boost results in slightly less power.

With Alcohol injection you are plain and simply adding more fuel..... so your air fuel ratio is richer in those conditions unless you use fuel managment to compensate.

Later,

Keith

 

Ok...to be honest...im still lost with this whole alky injection...i mean i understand the concept of it acting as fuel....but i mean the main thing i guess would be to cool the charged air?...correct...and to eliminate knock at high boost.....if im wrong...can someone please correct me so i can understand this a lil bit better

 

You are correct.

The main concept of any type of water or alcohol injection is the cooling effect the liquid has based on it's laten heat of vaporization. That is, when the liquid changes state from liquid to gas, it absorbs heat from the surrounding enironment, which in this case, is the hot air inside your IC pipes, intake, and/or cylinder, depending on where you inject from.

The second part, as Fourdoor mentioned, is that the presence of the vapor in the cylinder will help 'slow' the flame front in the cylinder when the mixture is ignited. Remember that when the flame front burns uncontrolled (too quickly), that is knock.

Although, I would imagine water would help the second point more than alcohol. To see which is better for the first point, you would have to compare the laten heat of vaporization for the different liquids.

Also, as Fourdoor pointed out, the alchohol has the additional benifit of acting as fuel and partially raising octane. But the main point of any injection is the cooling effect that is has.

Eric

 

OK what about on a daily driver. Do you all still reccomend using this system?

Also what kinda tuning/ecu is needed (this hasnt been aswered yet I dont think).

 

Now I'm wondering if this would be good on a stock turbo. I don't see why not. But maybe someone else does. I'm not even sure exactly how much boost the stocker will reliably hold/generate.

The interesting bit is the UTEC, for me. If I can turn this on and off, and switch maps accordingly, that's just plain awesome. 400 bucks to run a race gas-like map on the fly sounds like a damn good idea.

 

I had water injection on my GVR-4 and ran with it on a daily basis. I used a 1 gal reservoir and I didn't have to fill it very often. Mine was a combination of low tech (redneck engineered) and high tech (aquamist system). I used an old windshild washer 1 gal bottle as my reservoir, and a simple pressure switch that was adjusted to start the water injection when ever I was boosting higher than 15 psi. On crappy Hawaii fuel I was able to run 20 psi on a daily basis without problems (stock is around 11 psi for the GVR-4).

Keith

 

its the best on daily driver.