Basic water injection info
 

I have tried reading the stickies and other threads on here about injection.

I am not smart, I don't understand the full details of how this works.

If someone could explain in a very dummied or simplified form I would really really appreciate that.

I am looking for STRICTLY reliability for water injection.

I would like to know the most basic kit I could buy, cheaper is better but a good quality to match the price.

I am in the process of getting my engine rebuilt, back to stock, with all new seals and gaskets.

My mods that I will have on the car is

Bonez dp

High flow cat

Pettit cat

Smic, but huge after market ic and intake box with TIAL bv 50mm

power fc and commander

Ast deleted

Koyo rad in stock position

Walbro fuel pump

Stock twins (maybe going non seq)


After I get all this, and WI kit installed, I plan on immediately getting a tune



Please give me info on anything else you think I need, I'm not looking for hp, just to make the car last.

Here is what I use and the website has a how it works video

http://www.aemelectronics.com/water-...ction-kits-23/

that was a great vid, i feel stupid cause i couldve found that myself but i didnt think there would be something that simplified out there.

they sell a mixture kit though, would any type of water inj kit work for what i want?

is it better to get 5 gal or is 1 fine? what brands should i stay away from

Ya there are quite a few decent simple kits out there from different makes, I don't think any of them are bad. I've had problems with my aem controller so I would actually try something different if I had to buy another kit. Just to a google search for water injection kits and do lots of reading and research to decide what you like. And you can just use distilled water which you can get at any grocery store. I got the 1 gallon tank, I wouldn't want a bigger tank, just have to keep an eye on it, that's easy since mine is mounted in the hatch area.

You could put your water injector in the elbow before the throttle body, or in the IC pipe right after your IC, I've tried all locations. Just drill and tap for a 1/8 pipe thread and thread in the injector. You don't need a big size injector either, the small size would work good for your setup.

thanks for that info.

now the issue is buying a setup that doesnt work so well, i dont wanna waste my money, i wanna do it right the first time, i saw some "cooling mist" kits for sale on here, not really sure what to look for in the case of poor design or low quality product.

i figure aem kit is good since its name brand, but i dont need a name, just something that works reliably

You might find something useful here: https://www.rx7club.com/auxiliary-injection-173/another-option-pump-location-fd-959565/
Your mods are similar and I'm also running just water at the moment. In my case, I saw no need to re-turn afterward. Still running stock coils and heat-ranges too and I've no issues with ignition break-up either.

The only visible sign I have AI ---> http://i1126.photobucket.com/albums/...Install001.jpg

congratulations you are the right track w your mods. i am 100% w the advice given above and it is especially valuable because each has actually done it.

i often recommend Coolingmist AI products. the owner either has or has had an FD and has done an excellent job over the years of developing improved AI products. his name is David Hill and you might give him a call and mention my name. i am sure he would be happy to give you good advice.

RX7 store, i believe handles CM products and could also answer your questions.

water AI will not only keep your combustion chamber at the right temperature but will steam clean the carbon from your engine.

hc

Howard since we have your attention what do you think of rc fuel being used?
Theres a thread in altenative fuel but id like to know about injecting it through an ai nozzle

thanks for all this help!

now my next concern is where to place the nozzle

i know theres the elbow, IC piping, intake piping, and engine i believe. how do you choose?

what i want is the most reliable and efficient method possible, and placement of the system is important too.

there are tons of threads about location on here and other forums, you can do lots of research and decide what you think is the best location, where ever you put it it will work. I like mine in the IC pipe coming out of the fmic, or pre turbo (but that's not simple for you), or both. tank and pump is in the back for ease of install. controller under the dash

thanks!! i will do that

And a Inline check valve is a must or else your engine will suck in water under vacuum and run like crap and blow white smoke. This just happened to me because the built in aem check valve failed on me.

is that something seperate i have to by, say if i get the basic cooling mist kit or basic devils own

Their kits will say if they come with a check valve or not, I'm guessing most do now. At this point I wouldn't recommend aem's kit, I've had problems with every piece of the kit.

sweet, thanks alot man. ill prob get back on here when i finally get it and get ready to install it, which will be about a month, after i figure out what to do with my engine and how to get it rebuilt

Great info on this thread! As ramo, I'm also in the planning stages of a WI system with the same amount of modifications. I'm in it for the reliability aspect of WI only.

My additional question is, would a pre turbo injection benefit us with mildly modded cars? I have read that the stock turbos gets a lot of heat from the restrictive design of it. Would spraying into an air chamber like the stock air filter enclosure (or something like it) help the turbos run cooler? I know there's a few threads out there debating nozzle positions for the sake of getting more power, but my concern is strictly for reliability. Also, would putting the nozzle before the turbos lessen the effectiveness of it in the combustion chamber? There's probably no concrete evidence in all this, but I do value all your opinions and would appreciate inputs.

TIA

forget the on/off injection kits. Its silly that your fuel is metered to ms resolution, yet most are perfectly ok with dumping the water in with a simple on/off circuit. You need something that can be controlled with a PWM from a standalone ECU. Im thinking about getting this kit

http://www.vividracing.com/catalog/w...9hf0eutluahcn1

http://www.vividracing.com/catalog/w...schematics.jpg

same kit used on WRC cars. you can tune it like your fuel injectors with injector drive signal, and it has feedback in case of pump failure. RPM vs Boost precise mapped water injection.

End all resource for any info needed for water injection
http://www.aquamist.co.uk/vbulletin/

thanks for that last post!

now i feel stupid for not just googling that, i get so fixated in trying to find all the answers on the forum

and to gxl90rx7, thats wayyy to pricey for an injection kit.

many ppl use the basic and love it, thats what im looking for , just want to find the best way to go about it at a cost effective way, thanks for the input though, maybe down the road id try that setup

More complicated isn't necessarily better. It's just more expensive and typically less reliable. I think simple boost-activated systems are fine for simple goals.... like water-only for cooling, carbon control and knock suppression. Comparing it to fuel delivery is apples and oranges. Just follow Mr. Coleman's sticky for nozzle sizing guidelines.

Wannaspeed.com, "Mechanical" kit and is capable of delivering more water than you would ever need.

On that forum look up rice racing. He is pretty much the guru for water injection on a rotary. Has he many high horsepower cars last years and years with his tuning and his own water injection kits he builds.

awesome man, thanks ^^

bought a trunk mount cooling mist basic kit, still not sure where to place the nozzle, im running stock twins with street port