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Old 12-26-2004, 04:22 PM   #1
WhiteKnight
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Question Water Injection Nozzle location

Water injection users, what is the best location for placing the nozzle ?

Any comments ?
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Old 12-26-2004, 04:44 PM   #2
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Perpendicular to the piping, right before the throttle body. Try to not extend the nozzle too far into the piping either.
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Old 12-26-2004, 04:45 PM   #3
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What system are you using? If it is a 1 dimensional system, watch out for part throttle - full boost situations.
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Old 12-26-2004, 05:06 PM   #4
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What kind of WI are you using. Is it an all on or proportional system like a 2D ?

My 2 x 1.0mm jets are in the exit casting of my TMIC feed from dual 2D HSVs. They are sized to match 20% of the max flow rate of my PE-850s since this is a proportional system.
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Old 12-27-2004, 12:39 AM   #5
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I am using the aquamist system 1s.

I am not satisfied with this, maybe i am placing it in a wrong position...

Any pictures ?
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Old 12-27-2004, 01:36 AM   #6
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I put mine several inches before the throttle body. This gives the water a chance to evenly mix with the air charge before entering the engine.

If your 1S system is not working as well as you'd like you can upgrade it to a proportional system with the addition of some aquamist parts. PDXTuning is an aquamist dealer and can give you a hand sourcing the parts you need. In fact we have a few 1s and 2c systems on special at the moment.... contact us for pricing.

Non proportional systems are a compromise. Proportional systems are indeed the best for consistent performance.

Cheers
Bailey
www.pdxtuning.com
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Old 12-30-2004, 08:13 AM   #7
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Thank you,

where can i find the details of proportional systems ?
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Old 12-31-2004, 06:05 PM   #8
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Seems to me you'd want it to be immediately after the throttle body in the straight part of the manifold. Before the TB is probably easier to install, but under part throttle situations I really wonder how much of the water is getting stuck to the butterfly valve. More of a question than a statement, as I have no experience with these systems.
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Old 12-31-2004, 07:12 PM   #9
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but if you think about that, how much water gets stuck at the bends in the intake manifold?
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Old 12-31-2004, 07:22 PM   #10
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Quote:
Originally Posted by caryfd227
but if you think about that, how much water gets stuck at the bends in the intake manifold?
Good question and i don't know exactly how much of the injected water ends up trapped in the tubing and TB, etc. But, keep in mind that WI is normally on only under boost or higher flow and that the water comming out of the nozzle is a very fine spray. As a result i'd be willing to bet a ver small portion of the water ends up in the tubing.

Whiteknight: Details of the proportional WI systems can be found linked from the PDXTuning website:

http://www.pdxtuning.com/aquamist_water_injection.htm

Happy new year
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Old 12-31-2004, 08:43 PM   #11
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hmmmmm... just a thought, what exactly are the air temps on average after the throttle body? Now obviously because of the increased pressure the water will boil at a higher temperature but I wonder how much of that water is being converted to steam.... hmmmm... interesting

I've always like Water injection, maybe I'll get a spec C water tank and sport some WI for my most HP out of the stock turbo project

On a off topic note.I remeber in chemistry class we put a beaker of water on a hot plate and stuck it in a vaccume dome and stuck a thermometer in the beaker and put as close to as a perfect vaccume as we can get. I dont remeber at what temperature the water boiled but it was signifigantly less that 212 degrees farenheight. Something like 140.... I could figure it out mathmatically but I'm too lazy and WAY to drunk
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Old 01-01-2005, 08:47 PM   #12
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Place the nozzle well before the mass air meter or you will not get accurate reading results from it. I placed one in my turbo mustang before and after the intercooler with a thermocouple right before the mass air meter. I showed a larger temperature drop when I pumped water before the intercooler. Also I did some some better performance also when I used a 90/10 mixture of water/methanol. But remember methanol is a fuel and so it WILL lean out your mixture.

good luck
bix
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Old 01-02-2005, 01:50 AM   #13
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DO NOTput the injector in front of the MAF --- you will get an instant CEL and violent bucking if the water mist passes through the MAF.

In a normal TMIC setup you place it in the tube between the TMIC and the throttle body, or if you want to drill the intercooler, place it in the end tank just before the exit to the throttle body.

If a FMIC set the nozzle back from the throttle body 12" or more if you can to get even distribution and mixing before the air passes into the intake manifold.

A relatively small fraction of the water evaporates, and normal usage at high boost air velocities of over 100 mph in the throttle body make water "stuck" on the throttle plate a non issue.

Larry
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Old 01-02-2005, 07:19 PM   #14
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I didn't even think of the speed of the air. I read on a DSM forum that the speeds go well over 100MPH, so I guess the water really doesn't have much of a chance.
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Old 11-15-2005, 05:00 PM   #15
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i am about to mount nozzle on TXU FMIC piping.. anyone have picture of nozzle mounted on any fmic piping ? it should be between TB and BOV right? or is it before both TB and BOV
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Old 11-15-2005, 05:18 PM   #16
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That is the throttle body hose in the pics.



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Old 11-15-2005, 10:21 PM   #17
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thinking of that nut falling off and getting sucked into the engine is giving me the dry heaves.I would definately use a well nut or a nylon nut for that application. I cant believe no one has come up with something to avoid that
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Old 11-15-2005, 10:26 PM   #18
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so your nozzle is pointing up(shooting alky upward) ? or pointing down?

because i heard from somewhere that it should be pointing up.
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Old 11-15-2005, 10:57 PM   #19
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I have placed nozzles just prior to the throttle body, perpendicular to the air flow. Putting the nozzles close to the TB cools the charge as it travels through the manifold, and being that close to the heads, it may cool inside the cylinder as well.

You can achieve different effects as you move the nozzles further away.
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Old 11-16-2005, 08:37 AM   #20
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Quote:
Originally Posted by eatus ravenous
thinking of that nut falling off and getting sucked into the engine is giving me the dry heaves.I would definately use a well nut or a nylon nut for that application. I cant believe no one has come up with something to avoid that
Lemme tell ya, that nut ain't coming off. Heavy duty threadlocker and the spring pressure from the silicon hose keeps it nice and tight.
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Old 11-16-2005, 09:25 AM   #21
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Quote:
Originally Posted by wcbjr
Lemme tell ya, that nut ain't coming off. Heavy duty threadlocker and the spring pressure from the silicon hose keeps it nice and tight.
It's already rusting along the threads. Is that not what I see in the pic? I mean, I'm not trying to be argumentative or anything, but it does seem to be a valid point.
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Old 11-16-2005, 10:02 AM   #22
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That is oil vapor residue.
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Old 11-16-2005, 10:18 AM   #23
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i just installed one of these. this may help.
http://forums.nasioc.com/forums/show...a+mist+alcohol

Quote:
Originally Posted by nuhga
so your nozzle is pointing up(shooting alky upward) ? or pointing down?

because i heard from somewhere that it should be pointing up.
this perticular system operates at 100psi. the nozzles are .05mm to .07mm so the mist that comes out is so fine it doesnt really have a direction. it will immediately evaporate in the throttle body.

Last edited by Timmy Burns; 11-16-2005 at 10:24 AM.
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Old 11-16-2005, 02:16 PM   #24
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Quote:
Originally Posted by wcbjr
That is oil vapor residue.
Hmm! Well.....I just learn something new everyday. Oil vapor.....who'd 'a thunk it?
Thanks
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