homemade water injection kit

turbo-fever

turbo-fever

Member +
well everyone dunno if you read my post a little while ago i made my own intercooler spray bar (used jets instead) did it all for like £5 and thought it would be a good idea, but turns out the "mist jets" i got dont really spray a mist so it didnt really work out how i planned as my act's didnt really change.

so now decided as i have a bottle and pump etc already wired in im gonna make my own water injection system as i have done some research and looks quite straight forward and cheap as all i need now is:

1. a small misting jet (same as NOS use)
2. a hobbs pressure switch (so that it only sprays at the desired boost setting)

and thats it really just plumb the jet into the intercooler pipe set up the hobbs switch and see how i go.

just wondering what the thoughts are on this, i know it wont make a massive difference but for the price i thought i might aswell
 
munday

munday

Member +
If you're not going to map the car afterwards to make use of the water injection then you will gain no bhp, it cools the inlet charge but the water takes up the space that could be taken up by oxygen to be burned so you dont usually see any gains unless you up the boost and set up the ign timing afterwards.

If you were to do it, you could set the nozzle pointing by the airfilter so that its kind of a self regulating system, full chat and its sucking in the water with the air, off the throttle and it wont be taking anything in. Another bonus is that the water droplets will have to be small enough to get through the holes in the filter anyway, making sure the droplets stay small enough to atomise well.

IMO for a budget setup you would be better sticking with the intercooler spray, but optimise it. You can get hold of a 'spraying systems' nozzle (regarded as up there with the best you can get) and a nice powerful pump to go with it. I'll try and dig up some info for you mate

:drive:
 
turbo-fever

turbo-fever

Member +
munday said:
If you're not going to map the car afterwards to make use of the water injection then you will gain no bhp, it cools the inlet charge but the water takes up the space that could be taken up by oxygen to be burned so you dont usually see any gains unless you up the boost and set up the ign timing afterwards.

If you were to do it, you could set the nozzle pointing by the airfilter so that its kind of a self regulating system, full chat and its sucking in the water with the air, off the throttle and it wont be taking anything in. Another bonus is that the water droplets will have to be small enough to get through the holes in the filter anyway, making sure the droplets stay small enough to atomise well.

IMO for a budget setup you would be better sticking with the intercooler spray, but optimise it. You can get hold of a 'spraying systems' nozzle (regarded as up there with the best you can get) and a nice powerful pump to go with it. I'll try and dig up some info for you mate

:drive:
Click to expand...

yes more info would be much appreciated thanks mate. surely if your cooling the intake temps that in return normaly means its safer, and faster
 
G

GT_Ben

Member +
Yes but less oxygen (from the air) = less power

Its a case of making a safe compromise between boost pressure and amount of water injected. :)

Ben
 
munday

munday

Member +
turbo-fever said:
yes more info would be much appreciated thanks mate. surely if your cooling the intake temps that in return normaly means its safer, and faster
Click to expand...

Yeah the cooler intake temps do make it safer, but safer than what you already have...which should be safe as it is already? You will only see an improvement if you up the boost and map the ign to suit.

I'll have a shower then dig up some info for ya :)
 
O

Ooomoo

Member +
GT_Ben said:
Yes but less oxygen (from the air) = less power

Its a case of making a safe compromise between boost pressure and amount of water injected. :)

Ben
Click to expand...

sounds like your talking about water into the engine not onto the intercooler bud, the sprays for the intercooler to reduce the inlet temps before it goes into the engine, the colder the air the more dense so more power..
iv had them before, easy to set up but why not just go co2, its almost the same setup and will really reduce your inlet temps :)
 
turbo-fever

turbo-fever

Member +
Ooomoo said:
sounds like your talking about water into the engine not onto the intercooler bud, the sprays for the intercooler to reduce the inlet temps before it goes into the engine, the colder the air the more dense so more power..
iv had them before, easy to set up but why not just go co2, its almost the same setup and will really reduce your inlet temps :)
Click to expand...

yes thats exactly wat i thought. i read an article about co2 and and actually reduces power because although it does reduces intake temps the engine is sucking in co2 instead of oxygen which an engine needs so in return makes less power
 
G

GT_Ben

Member +
Ooomoo said:
sounds like your talking about water into the engine not onto the intercooler bud, the sprays for the intercooler to reduce the inlet temps before it goes into the engine, the colder the air the more dense so more power..
iv had them before, easy to set up but why not just go co2, its almost the same setup and will really reduce your inlet temps :)
Click to expand...

Howd you guess.... :p

Water injection, just like fuel injection..... This is a much more efficient way of bringing your intake temps down than spraying water onto the intercooler! ;)

Ben
 
munday

munday

Member +
turbo-fever said:
so i would still need a more powerful pump, plus some mist spray nozzles just need to know were to get them from
Click to expand...

The nozzles can be bought from 'spraying systems'

The pump is a harder choice, as you want to maintain high pressure at low output volumes. I cant remember where i saw it, but they recommended a piston type pump like the kind you get in...wait for it....an espresso coffee maker! lol

Let me get some food and i'll find links :)

EDIT: Right, the pump recommended is a vibrating/oscillating pump...Ulka seems to be the make to go for http://www.kellysearch.co.uk/gb-company-5791217.html

This is a good example of the corrdct pump: http://www.espressoworkshop.com/shop/shop133.html
 
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turbo-fever

turbo-fever

Member +
thanks a mil munday think i have read some of them articles already they are a good read think i got an idea on the pump but there are so many nozzles to choose from lol

o yer rep added lol
 
munday

munday

Member +
No problem mate :), did quite a bit of research into it a while ago but other things took priority in the meantime :slap:
 
azerty

azerty

Supermoderator
if you were not that happy about your intercooler sprayer job, howcome you've decide to do a water injection instead ?

Water/Methanol injection kits are cheap enough to not risk your engine with a cheap job. make sure you have a proper fail safe system if you don't want to see you engine pop. when you IC sprayer don't work properly, it is not that bad, Water/meth injection is an other story

on the other hand I give you all respect for your search, just don't want to hear you poped your engine.
 
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