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Location:
Parramatta
Registered:
July 2002
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Location:
myrrhee
Registered:
March 2004
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Re: water injection.
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Fri, 12 November 2004 04:29
 
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It dosn't really matter were you inject the water.
I would plumb it in before the turbo as it is easier than pushing against your boost pressure.
If you do this you could use a pressurized bottle system where the engine boost pushes on top of the water making the water only come on during boost.
I would use a nitrous oxide 'dry' injector for the water and an LPG fuel solenoid to allow the system to work only above say 25 degrees inlet temp.
The nitrous injectors are jetted so you could tune it easily.
I hope this helps mate.
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: water injection.
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Fri, 12 November 2004 04:34
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| 84supra wrote on Fri, 12 November 2004 14:59 |
I would plumb it in before the turbo as it is easier than pushing against your boost pressure.
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Bad idea.
Ive heard of it causing corrosion of the compressor wheel.
If your running a proper water injection system, the pressure wouldnt be a problem anyway as the water pressure is much higher.
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Re: water injection.
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Fri, 12 November 2004 04:48
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Yeah.
I'd never plumb anything in to inject before the compressor. The erosion of the compressor wheel is not what I'd be wanting, especially on a lovely new GT35R.
I'd also avoid plumbing it before the intercooler. My reasoning for this is that the speed of the gas drops hugely when it enters the IC and the water will tend to fall out of suspension in the cooler. This condensed water in the cooler has too much potential for hydraulicing the engine and bending a rod.
Using a solenoid to close the line is definately a good idea, this stops the line from syphoning out on the small amount of vacuum generated by sucking through the IC.
There are a couple of guys on http://www.mr2oc.com who sell water injection kits. I guess you could take a look at what they have done and reproduce it locally.
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Location:
myrrhee
Registered:
March 2004
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Re: water injection.
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Fri, 12 November 2004 05:16
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I haven't heard of corroding the compressor wheel before.
Better to be safe though.
Running water through an intercooler works fine, but you do make a valid point Josh.
All this considered, and the fact that you have an after market ECU to control the system I would probably use a nitrous injector straight after the cooler, LPG solenoid and maybe a headlight washer pump (may not push well enough against the pressure?) or something, all up costing under $100.
Note: Water/Alcohol mixes work better than just water.
Have you thought about using nitrous oxide as a cooling agent?
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Location:
Brisbane
Registered:
July 2004
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Location:
Parramatta
Registered:
July 2002
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: water injection.
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Fri, 12 November 2004 08:46
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http://www.aquamist.co.uk/
http://users.frii.com/maphill/wi.html
i to have been wanting to do a water injection set-up, already bought aluminium container for it (got 4 of them from a scrap yard).
i already have the w2a i/c set-up but i'll be building a 4agte with 83mm ca18det pistons (when i receive the them and acumalate the other bits i need). so i think because of the thinner bore walls i'll need some extra cooling.
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Registered:
September 2002
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Re: water injection.
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Fri, 12 November 2004 10:04
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I tried some of the water injection parts from auto speed and seemed to work well. Though in my instance i was going through water quickly as i dont have an intercooler yet. On my wolf 3d controller you could visually watch the temp go down very quickly once the water injection kicked in. put the injector after the ic and you can add some metho to the water for added power aswell. (acts a bit like staged injection).
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Location:
parra
Registered:
June 2003
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Re: water injection.
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Fri, 12 November 2004 10:16
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i've heard that if you plumb the water in before the turbo it can eventually wear the compressor away... like how a river gets made...
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Location:
Canberra
Registered:
October 2004
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Re: water injection.
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Fri, 12 November 2004 11:02
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hi guys under some peeople heres advice i am considering this option and I have a couple of questions you guys might be able to answer, as it relates to this thread. (don't mean to hijack the thread)
1) how much is a simple kit worth one that runs on pressure? and where can you get one?
2) how much water does it consume/ how often do you have to top up the water and how big does the tank have to be?
3) Do you think the steam cleaning effect on the bores of your cylinders cause extra wear. For example a 2-stroke motorbike gets water in it, it will seize up straight away as it washes the lub of the walls. (although you can ussually start it again when it drys) 
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Location:
Brisbane
Registered:
February 2003
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Re: water injection.
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Fri, 12 November 2004 12:42
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my old water injection setup was to spray ahead of the turbo - i'd say it slowed down the turbines - tho am unsure of the erosion affect on the turbines as i;ve since gotten rid of the turbo (long story).
pre_turbo is certainly simpler - but you'll hav a delay between trigger and affect - and even more pronounced if there is an intercooler in the way.
dont forget that any high pressure water injection requires methanol/water suitable injectors - stock EFI injectors will rust or corrode internally - methanol injectors are suitable as they are stainless steel internally.
anthony: regarding query #3, no corrosive affects observed - the water is in vapour form by the time it gets into the chamber and will not condense on the cylinder walls. The only risk is too much water that results in hydraulicising (attempt to compress water).
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Location:
Colac, Victoria
Registered:
May 2002
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Location:
Parramatta
Registered:
July 2002
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Re: water injection.
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Sun, 14 November 2004 00:54
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cheers but dont those ERL systems cost an arm and a leg, being that they use there own computer to contorl the injection?
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Location:
Colac, Victoria
Registered:
May 2002
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Re: water injection.
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Sun, 14 November 2004 08:24
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they are not a cheap solution , but they have been tried tested + proven to work well 
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Location:
Benalla
Registered:
December 2004
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On Probation
Location:
nsw
Registered:
March 2004
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Re: water injection.
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Tue, 21 June 2005 07:33
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There was an article in the last street machine that used a hobbs switch
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