I am ordering my water injection kit this week. Hopefully I will be able to install it sometime after July 4th. My reason is to get rid of knock. Right now when I go to the track, I get knock above 5500RPM but only in third. The only thing I can figure out is this is also when my IAT2 temps rise over 150. A lot of SRT-4 guys have success using water injection to stay in HOM.

I know very little about water injection but I am trying to get some pros and cons of it. If you have any insight or help, please add in!

Pros:
-Cooler intake temps
-with methanol, equivalent of higher octane
-helps clean engine
-relatively in expensive compared to nitrous

Cons:
-tuning with W/I or M/I can lead to bad things if you tune for injection and something happens to it. There is a guy over on SRT forums who blew his bottom end up because he was tuning with W/I and his pump blew a fuse.
-Possible wear to the supercharger? this is a debatable point. Some GTP guys say they saw excessive wear but this was on older gen blowers. Chance at Devil's Own said he doesn't see any extra wear on his blower.
-Always have to refill. Although it is less expensive than nitrous it still is a refillable system

Right now I am looking at a Devil's Own kit. They seem to be relatively inexpensive and thus far they have answered all my questions in a timely fashion. www.devilsownonline. There are other kits too Coolingmist, Snow Performance, etc.

I am not to worried about having to refill the system all the time. I already have an icebox that I refill when tuning or running at the track. I am planning on running warning lights that show when the pump is spraying so I know it is working properly. Also, I am thinking of running a boost switch that would cut boost if something happened to the pump.

Any input would be appreciated, feel free to jump in!

 

how would you do that

 

get on aim dammit...i need to talk to u about this

 

You can just wire a LED light inline with the relay contained in the kit. If something happens to the relay the light will go off.

Now as far as a boost switch.....
I am not sure exatly how it would work. The theory is that somehow send a signal to the butterfly valve to open and bleed boost if the pump kicks off. It would be very noticeable and give you a little time from running the car dangerously lean.

 

The con about wearing out the supercharger has yet to be proven. I have a LED on mine to show me when the water meth is spraying.
The best way to tune the car to water meth is with a electronic boost controller. You can program the ebc so that when the water meth is spraying, It goes into high boost mode and prevents timing from being pulled. I am not sure if the EBC works on supercharged cars as I am fairly new to the subject.
If you are worried about filling it so often, look into Coolingmist's 1.5 gallon tank. You can get it in a kit that has a pump that is specially designed for water meth so it doesnt wear out as fast (which no other company carries). Thier kits have the flow detector to see when the pump is actually flowing istead of just on. Good incase you run out of meth and the pump is trying to run. If you need a price on a kit, check out glacialgraphics.net He is doing a groupbuy on them now.

 

I don't know about spraying before the charger. introducing any more moisture in the bearings cain be a good idea, you may not blow your charger or seize it, but your probably going to have to rebuild it sooner.

 

Most websites say not to think of it as dripping water in but rather almost fogging the intake. When the fine mist hits the hot air it quickly evaporates. I am thinking of just going with a single stage nozzle tapped in my intake and then possibly later upgrading to a dual kit with an 5gph nozzle after the supercharger.

 

if its truely a fog then its no worse then driving in the rain...especially with some of the welfare mods some ppl have for intakes...dammit pat u talked me into it

Dan

 

giggity giggity goo!

 

I think you are an easy sell.

 

You shut your mouth when your talking to me!!!

 

HAHAHAHAHA

 

thing is your not spraying into already hot air, your talking about spraying cool air before the impellers inside the supercharger compress the air.

so if you plan on spraying from the intake, that means your wetting (granted it is a light mist) the throttle body and the bearings, along the intake of the supercharger as well as the impellers.

it will not evaporate until after the impellers of the supercharger, have compressed the air.

are there any kits that would spray after the supercharger, like in the intake manifold, where the air is already charged and really hot?

 

that seems more practical to me... misting a CAI isnt going to 'evaporate' water.

 

https://www.cobaltss.net/forums//showthread.php?t=23588 that might help. I like the Cry02 method myself, I might order one especially with the California heat wave we get every year. check it out!

 

I have a friend with a wicked 500+hp STI and he has a meth injection that goes into his fuel rail. If I were to do a meth setup, this is what I'd do. He showed me his tuning parameters with and without the meth and its amazing what the car does on it.

 

cooling the fuel is a good idea as fell, but I don't think that is our problem area, we probably have more to gain by cooling the charged air

 

I think a lot of your heat is coming from the supercharger. I have no doubt that spraying after the charger would work but I don't think it will be as effective. Ultimately, as I stated above, I would like to spray a second, larger nozzle after the charger too.

 

my s/c is getting hot as f*ck with the boost i"m pushing now... anything to cool it down would be great..

 

Heres an Idea I'm throwing out, not to sure of the praticality. What a bout a plate you run coolant through between the intake mani and the SC, similar to a liquid heat sink on a PC CPU (yes i know im a geek). This could be done with coolant, freeon, Liquid CO2.

 

thats exactly what the aftercooler is doing now,

has anyone looked into converting to a dual pass system like they use in the grand am cup series raceing yet.

I beleive they replaced the intacke manifold for a dual pass system and added another intercooler infront of the radiator.

 

You can run a kit that sprays directly into the manifold after the supercharger. The kit I am talking about uses 4 diff nozzles that spray into each intake runner. The nozzle is really small so it would evaporate almost instantly. That is what I am in the middle of installing.

 

se that sounds like a better idea, and that is where we really want the temperature to come down, not where the cool air is comming in from

 

It is, be far, the cheapest and most effective way to lower the intake temps and help out your entire engine. The problem is that people are worried about spraying "water" into the engine.

 

thats why the nozzles on this type of kit are smaller. so that the amount of water introduced is negligable.

just as long as it's only a quick spray and it doesn't stay on.
besides your doing no better by spraying 3 times as much before the supercharger