halimsteven

so wait a minute, so if you have a turbo, it's said that we should put the nozzle toward the filter or TURBO discharge for maximum cooling. that's what i read in teh AEM instruction. by the way, is it after MAF ?
steven

dannobre

iTrader: (3)

Put it just before the TB.....you don't want it filling your intercooler with alky or water vapour

You might want to think about your IAT sensor position.....

Don't want to pull Alky through your MAF...wouldn't last very long

halimsteven

that's what i thought, but there is BOV, so in other words, it's between BOV and TB?
steven

marcux

hrm, that sounds like what I will do then, I just remember seeing a picture on here in the past where somone put the nozzle into the top part of their plastic upper intake manifold.. mabey it was olddragger or somthing..

halimsteven

i think if you you talking about OD, he has SC.....
steven

BDC

+1. Listen to Dan, folks.

B

Red Devil

What are your thoughts regarding pre-throttle body on the positive displacement SCs?

MazdaManiac

iTrader: (3)

Best place is just before the TB on a turbo app. No check valves or anything like that needed.

neit_jnf

pre-turbo has its applications as well. there are some 500-600whp 13B's in Australia using pre-turbo water-only injection, running pump gas.

there are a few threads in the 7 club, ausrotary and aquamist forums about pre-turbo injection.

http://www.riceracing.com.au/water-injection.htm

http://www.ausrotary.com/viewtopic.p...st=0&sk=t&sd=a

http://www.aquamist.co.uk/phpBB2/viewtopic.php?t=267

rotarygod

Peter's (Rice Racing) setup is pre turbo. His nozzle arrangement is interesting though. He wanted to get a finer spray pattern as he claims he was seeing compressor wheel erosion from the water entering it. I find this odd as turbo have been run post carb before with no errosion issues but I suppose it's possible. Then again maybe they did have erosion issues over time.

His nozzle is basically that of a paint gun. A paint gun diffuses paint with high pressure air to create a fine mist. He's doing the same thing but instead of paint he's obviously using water. He has an airstream breaking the water up into a fine mist. He does this by sending pressure from the compressor side of the turbo to his water reservoir. The water leaves from the bottom of the tank (as it has to) and goes through a control valve. The pressure port from the compressor goes into the top of the tank above water level. There is also an outlet from the top side of the tank that goes to the nozzle (water injector) which is the air source that turns the water into a fine spray. His "system test" video clearly shows this and it appears to be a paint gun that has been taken apart. Since the nozzle assembly from a paint guy is large, I assume he's created a kit that works on the same principle but uses more specialized part. I may have described it a bit too simply but he doesn't seem to have any compressor errosion issues with this arrangement.

olddragger

iTrader: (3)

i would like to know how a pre turbo water injection would NOT cause erosion/blade damage?
May be possible but i cant think how?
olddragger

BDC

That's what I'd like to know myself.

B

MazdaManiac

iTrader: (3)

Yeah, I've heard a bunch of stuff thrown around about that.
Since water has mass and acts like a solid when accelerated (and, therefore, is minimally compressible), I would think that putting it into the system ahead of any compressing or accelerating device would be a bad idea, regardless of how "atomized" it is.
Now, I suppose if it undergoes a phase change before the device it might not be a big deal, but who has >100°C intake temps?!?!

rotarygod

Water is compressible 2% per 10,000 psi!!! That may as well be non compressible!

I want to know how you fit an atomizing air gun nozzle into an intake system.

MazdaManiac

iTrader: (3)

Exactly.

Hmm. A really, really big pump?

joff

You need one of these.

MazdaManiac

iTrader: (3)

Yes! Searching E-Bay now!

the_duke313

is there a chance u could point me in the direction of a write up on how to do that?

rotarygod

It will absolutely scare the crap out of you and I'm not sure how the RX-8 ecu will respond to it. You'll probably get a cel. There are many rotary owners that swear by it though.

Basically I just found a vacuum nipple immediately after the throttleplate. I hooked a small vacuum line up to it and ran the other end to a gallon of water. Started the engine and held it at 2000 rpm. I let it suck up the water until it was gone. The engine bucks and sputters and isn't happy while this is happening and the amount of steam coming out the exhaust is downright alarming. It will not stay running on it's own. After the water is gone just return everything to normal and go for a drive. It'll take a little bit for the steam to quit.

Do this AT YOUR OWN RISK!!!!! I am not responsible for any issues or damage you may have if you try this. I do it on my RX-7 and it works great. If it makes you nervous, don't try it.

olddragger

iTrader: (3)

i have ran a gallon through mine while driving(water/meth injection) 8 miles---no real issues.
looked like a stanley steamer though!
OD

czar

iTrader: (3)

seen that done on piston engines days before the seafoam craze, they usaly have some one to pinch the hose or limit the amount it can take not to hydrolock the engine though

may want to try a funnel and pour a little at a time into it

halimsteven

i don't know if it's stupid or what, but i was just thinking about it.
if we run 100% water, and of course we have to find the right nozzle for the intake, but we also add the second line for the "Intecooler" spray, what do you guys think about that?
so in otherwords, there are 2 outputs which are spraying "the engine" and "intercooler", does it sound ok? note that we run water 100%...what do you guys think about that? does anybody ever do it?
steven

czar

iTrader: (3)

i think that may be a bit over kill honestly, unless your having temp issues

halimsteven

i don't know, it's just for fun, you know that sometimes you see front of the intercooler, there is a line so they can spray it from outside of intercooler,so it's teh same when it's rainning outside, your intercooler gets cooler, not from inside. just wondering
steven

neit_jnf

I think it's a good idea, just keep the intercooler spray nozzle small, something like M1