oyvindjs

iTrader: (4)

Hi. Sorry, Im on my cell and have bad connection where i am now so searching takes 1.5 years per search...

I see some have it in stock uim hole after water injection nozzle. Some place it before the water injection nozzle.... where to place and why. ..?
Benefits/drawbacks....?

IRPerformance

iTrader: (41)

I like to use a fast acting intake temp sensor and keep it in the stock location. It needs to be after the injection point. Also, you don't want to spray the water directly onto the sensor. You need to give it time to atomize.

oyvindjs

iTrader: (4)

Hi!
Thanks, i have the injection nozzle in my greddy elbow, is that ok?

fendamonky

iTrader: (6)

I don't currently have a fast reacting AIT sensor (still running the old oem one) but I'll be putting one in when my engine goes back in. Like Ihor suggested I'll be running mine in the factory location.

For nozzle placement, I believe you'll want it as close to the exit of your Intercooler as you can manage if you aren't spraying pre-turbo. This will give your meth (I assume you're running WM50?) the most time to atomize before entering the combustion chamber.

Sgtblue

iTrader: (16)

For water injection, yes. If/when you move to a methanol/water mix, then as fendamonkey points out you would want it farther up-stream to give it time to cool the intake charge. Since water's biggest effect is cooling inside the engine during phase change from the combustion event, having it (water-only nozzle) closer to the throttle-body is fine.

Also, for a water-only system installed for safety, you won't be tuning with it. And (IIRC) Howard Coleman recommended nozzle placement after the IAT so it doesn't mess with tables.

oyvindjs

iTrader: (4)

thanks, for replying fenda and sgtblue i will only run it for safety, straight water, nothing more. I will have it turned off for tuning, and just run it for safety when running 21 psi @ BNRs.

One thought... If i do not tune for water, but run it for safety after tuning, with the AIT after the water nozzle.. wont the tables be off when spraying water then? Or will the AIT sense its "colder" and correct/add more fuel when spraying? Or am i misunderstanding something here? Ive slept only a few hours tonight, and im kite-high on coffee atm.. so brain is abit.. off..

IRPerformance

iTrader: (41)

I wouldn't advise running wi without a fast acting sensor. The stock one is just too slow to respond. Greddy elbow is fine for the injection point if the sensor is in the stock location under the intake manifold. Spraying after the sensor is just silly. You won't take advantage of the wi and risk blowing the motor. You want the computer to see the actual intake temps. If you spray after the sensor, the computer will think the intake temps are hotter than actual and PULL FUEL. Since the intake air is actually much colder, you will lean out. Case in point: You have a stock or stock mount intercooler and are sitting in traffic. The intercooler is heat soaked and intake temps are over 100 degrees. Traffic opens up, and you punch it. With the stock sensor the computer will still think those intake temps are 100 degrees. It will take several miles of cruising with good airflow before the stock sensor budges. So the computer pulls fuel according to the temp correction map, you lean out, and blow the motor. Seen it happen a dozen times. The same thing can happen if you inject water after the sensor. Its nice to be able to see the intake temps drop as the water injects so you can judge the efficiency of the system. Straight water also does not evaporate as well and I found a ton of corrosion in motors and the intake piping that ran straight water. You always want to tune for the water, but not to the edge that the motor will be risked if you run out. Everyone has an opinion but I have been doing this for a long time and have yet to lose a motor, even at the 500 wheel hp+ level.

DriftDreamzSS

iTrader: (4)

I run 315cc of water only injecting in a greddy elbow with a fast reacting ait in stock location. I did have to pull some fuel from the correction tables as I was going overly rich and getting ign breakup from the temps dropping so drastically. I think there may be some other factors involved, water is much more thermally conductive than air and I wouldn't be surprised if the water spraying directly on the sensor element is making the readings not 100% accurate.

IRPerformance

iTrader: (41)

You don't want the water spraying right on the sensor.

Erix7rew

iTrader: (7)

My current setup is the fast iat sensor in the elbow greddy near the throttle body and the AI nozzle in the elbow greddy about 2 inch before the IAT sensor. I now inject 50/50 so from what i read i'm better back up my AI nozzle!

What about this place on my intercooler? IAT sensor on elbow greddy and AI nozzle on intercooler spraying in front of suction pipe



Thank

s93

I have a fast acting IAT in the stock location and WI in the Greddy elbow. The car starts well when cold or just turned off. But, it doesn't like to start after I drive it and park for an hour. I'm guessing the IAT heat soaks. It has a fresh rebuild w/streetport, good compression, and a Steve Kan tune.

Does it sound like IAT heat soak? Does moving the IAT to the elbow help? Any other ideas?

IRPerformance

iTrader: (41)

I'd move the injection point to the cold side intercooler pipe. I don't like spraying into the intercooler because it tends to fill with water.

IRPerformance

iTrader: (41)

Thats going to have to do with your tune. Correction tables for intake temp need to be adjusted.

Erix7rew

iTrader: (7)

So the best for my setup is somethinh like this:

IRPerformance

iTrader: (41)

Thats what I recommend.

Sgtblue

iTrader: (16)

Ran across this while looking for some other info and remembered this thread...FWIW:

https://www.rx7club.com/auxiliary-in...nstall-593216/

Tem120

iTrader: (5)

I've been using the stock IAT Sensor , But it started going a bit wonky today. so I think its time to switch to a FAST one I am also running water injection . and I've been debating changing the location of the nozzle , currently I have it just before the greddy elbow .

BUT I read the best place for water injection is as far away from the intake as possible IE right after the turbo . or before it


So I have 2 questions! ,

First is what IAT are you all using ? is there any plug and play style ones that I can just unscrew , and plug in ?

And where do you guys suggest I relocate the water injection nozzle ? or should I leave it where it is ?


And

ZE Power MX6

iTrader: (160)

Wannaspeed sells one with PnP harness, that's the one I use. As far as WI nozzle, I would put it right after the IC.

Sgtblue

iTrader: (16)

Water's cooling properties primarily take place in the combustion chamber. It carries a lot of heat from the combustion event out with the exhaust. In contrast, alcohol (AI) is much better at cooling the intake air.
So if you intend water injection, placement upstream isn't as critical. If you intend to mix, then placement farther upstream will give the alcohol more time to cool the air charge...and be more effective.