ive been thinking about building my own water injection system. ive looked at lots of plans and info on it but i still have some questions. what injector flow rate is safe to use and what do i use for an injector? can i just use a stock dsm fuel pump? since i still have a 14b and probably wont see too much knock anyway. so ill probably keep the flow rate very small. then i can just up grade injectors as they are needed. id also like to hear peoples opinions on this. good or bad

You might want to do some research on what water injection is first and how it works. You don't use a fuel pump or fuel injectors to spray water. I would personally just make the car fast without using it.

If you want someone to talk in more detail with about water injection I would get ahold of Charlie (SOURCE1604 on most boards). I *think* he has a water injection system on his car but I'm not sure if he has run it yet since his car is usually in pieces. His website is http://www.its-over.net

Like Shane said, save the WI for later...make your car fast w/o it first then possibily add it in the future once your setup really demands it.

Jakey, do you memorize links or do you have a gigantic list written down somewhere?

I bookmark damn near everything I come across.


Jason what brought about thinking about water injection, just a possible idea?

well the water has to get from a tank to the engine. im not saying it needs a fuel pump but just a suggestions because the stock pumps are cheap and easy to get. then the water has to be atomized and put into the ic pipe. is that right or am i just crazy?

Look at the AquaMist kits online, that should show you how complicated they really are and what you will all need to make it work.

i agree that i should wait until i the car is fast but i would like to see if the if i can just get a working set up and just put it on when its needed

Personally I think you would benefit much more from a higher performance intercooler system than WI by a long shot and the money you would spend on WI would put that off further. As far as logical mods on a 14B powered car, it isn't really one of the ones I would focus on. It may be "trick" and not that common, but there are so many things that should come before it that at this point I seriously believe it would be a waste of your resources as far as bang for buck type value. For the money you would spend on it to do it correctly(aquamist or similar), you could be looking at the IC, Fuel system control (AFPR if you havn't gotten it yet) porting work, exhaust upgrades, better turbos etc, the list is huge, but you get the idea.

Not only that, Dre tried it on his car and could not tell the difference when it was on or off. That was with a well tuned car running an AEM EMS. We have had debates on here before about whether it would work or not. I don't want to get into that again. I would stick with the proven mods. UICP and a walbro 255lp for example if you don't have them.

a lot of people consider water injection just a band-aid for bad tuning, at least for a street car

I have dynoed a supercharged M3 a couple times that runs water injection. With it off or on the power is the same. The power curve with it off is very jagged and looks like the car is knocking, with the water injection turned on it is exactly the same. He can't turn up the boost easily like you can on a turbo car when the water injection is running, but it looks like crap no matter what anyways.

We have tried some WI homemade systems here and in the long run it just turns out to be a mess and a hassle to work w/. Although it did seem to cure some knock problems but all i gotta say is make sure you don't run out of water when your trying to tune w/ WI.
As far as running a stock fuel pump, you cant run water threw the fuel pump, it will eventually destroy it. Although Shureflow does make some high pressure pump designed for t his application. But IMO like others said it is just a band aid for a bad tune, and in the long run it just ends up costing more $$ than it seems to be worth...lost cause.

Nick

ding ding ding ding, we have a winner.
alot of the 3s community uses water/alcohol injection kits to cover up for a lack of fuel and lack of turbo efficiency, it helps cool the air charge due to the fact that the 9b's spit alot of hot air, and the stock sidemounts are smaller than dsm sidemounts.
upgrade your intercooler pipes/endtanks first, it'll be around the same price when you get down to it, and it'll show much larger and more consistant gains over a band-aid tuning method.
just my $.02, but what do i know :blah: