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Old 01-18-2006, 02:24 PM   #1
rewt
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Default Pre-turbo WI

Hey everyone... I figured this section would be the best place for the question, so I hope I'm right. I basically was interested in opinions on the best way to accomplish pre-turbo WI...

Is there a kit that already exists for this?
If not, what sort of nozzle should be run? Based on reading about aiming the water at the compressor nut, I would assume a typical misting nozzle used for post-turbo WI would not work... or would it?
Would I need to run more pressure in pre-turbo WI?

Any information about this would be much appreciated. TIA
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Old 01-18-2006, 02:34 PM   #2
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No kit.
Have to be careful of backflow so use check valves (boost will push water into intake).
Use a mist, not a stream.
You'll need very good boost control.

I'd say this is an advanced form of water injection. I'd set up post-turbo water injection first before you turn to pre-turbo injection. Pre-turbo has it's place, but it definately complicates the whole set up. I'd be sure you are really comfortable with water injection in general before you turn to trying to compress more air with it.
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Old 01-18-2006, 02:44 PM   #3
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http://www.aquamist.co.uk/phpBB2/viewtopic.php?t=267
You might have to sign up to view that. But it is ~20 pages about pre turbo WI.
It is a good place to start.

TMS
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Old 01-18-2006, 02:44 PM   #4
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I've been running post-turbo WI for a while. I'm interested in pre-turbo WI, but I was looking for more information (like nozzles, pump pressure, etc) before trying it.
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Old 01-18-2006, 02:45 PM   #5
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Quote:
Originally Posted by TheMadScientist
http://www.aquamist.co.uk/phpBB2/viewtopic.php?t=267
You might have to sign up to view that. But it is ~20 pages about pre turbo WI.
It is a good place to start.

TMS
Thanks! Sign-up is not a problem if the info is good
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Old 01-18-2006, 07:41 PM   #6
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My thanks to TMS; the thread on WI.info is great. Just the type of information and discussion I was looking for.
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Old 01-18-2006, 10:35 PM   #7
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....IIRC, hotrod has done this....mebbe he will chime in and give us the benefit of his considerable experience
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Old 01-18-2006, 10:48 PM   #8
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hotrod participated in the aquamist forum. I used three 0.5 mm nozzles, two in the intercooler and one in the intake (a check valve prevents siphoning). The pump was at 7 bar. Adding the pre-turbo injection did increase the amount of air compressed as measured by AFR at the same boost pressure.
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Old 01-19-2006, 07:43 AM   #9
hotrod
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Yes I have some posts on that forum discussion.

Cliffs notes version.

Per-turbo compressor WI can increase the effeciency of the compressor by several percent.

Its benefit is most noticable on undersized over stressed turbo's (ie stock WRX TD04-13T),or if inlet air temps are high and humidities are low (ie desert condtions)

It can lead to some compressor blade errosion if over used, and or excess water is sprayed.

Some small amounts of compressor errosion appears to have very little effect on compressor performance.

Do not attempt this --- unless your willing to read and understand the above posted discussion on pre-compressor injection on the aquamist site, and are willing to consider the compressor a wear part and replace it if you overdo the WI amount.

Larry

Last edited by hotrod; 01-19-2006 at 07:49 AM.
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Old 01-19-2006, 12:25 PM   #10
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Yeah, I've been reading through the thread on the Aquamist site, and unfortunately, I don't think pre-turbo injection is something I'd benefit from in my specific circumstances...

On spool-up, my compressor is already pretty close to the surge line on the compressor map, so I'm thinking unless I want to only inject at high RPM, high flow, I think pre-turbo WI would lead to guaranteed compressor surge. It would have been a nice idea on my 20G though.

Thanks for all the input.
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Old 01-19-2006, 01:09 PM   #11
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There is a thread on NASIOC where Richard from Aquamist has been posting. I think his username is RichardL, but the thread title has "aquamist" in it.
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