DIY water meth kit any of you chaps done one already?

[masterbateson]

Thinking about knocking up a water meth kit, any off you guys done one already?

Im wondering can you use a fuel pump as the pump for the kit? also wondering if you could use a large coolant reservoir/bottle from a scrapper you know the pressurised type ones.

Wonder what other scrap heap salvage you could use? relay and switches i guess rubber fuel hoses maybe old wiring loom

Wonder if you can make a kit for less than 50 quid

[raptor95GTS]

quite a bit of information on www.mr2oc.com regarding this

[C35Rob]

there's loads of info all over the net for this. most people use a shurflo 100psi water pump, the same pump that's re-badged and used by most "real" water injection kits. they're about £75 new (or double that if you want a WI company to put their sticker on it)

then you just need a reservoir (universal screenwash tank), hose, a relay, master switch, pressure switch, nozzle and some wire, fuses etc.. it's easily do-able from all brand new parts for ~ £150

the easiest and cheapest way to do it is to inject pre compressor. that way all you need is a tank, nozzle, switch, solenoid and the hoses.. you don't even need a pump as the boost pressure in the manifold pressurises the tank which pushes the water through the jet/nozzle - the advantage of this is the amount of water injected is directly proportional to the boost pressure. pre compressor injection also increases compressor efficiency which is a good thing since CT26/CT20's are pushed hard over a bar

[masterbateson]

So you lob it in after your air filter straight into your turbo I'm surprised at that.
I'd of thought that if you did that it could knack your turbo up, but main thing about that which surprises me is............
If you inject/mist it there doesnt it
A: turn to steam/evaporate in your hot pipe a bit? and
B: wont it recondense or summat in your intercooler? and
C: if you turn it into a nice mist there what happens to your nice mist after going thru the intercooler?

Had a look at this yesterday http://www.turbomirage.com/water.html

[masterbateson]

Slightly off topic but seeing as I am in pondering mode.

You know the air intake on a stock set up, just before the turbo you have a 90deg metal elbow, are you not better with a straight pipe/run into the turbo and is it poss on our cars? Also are you guys bothering to run ducting from side vent up to your air filter and also maybe into an enclosed filter setup?

[C35Rob]

Yes you spray it (as a fine mist) directly at the compressor wheel, it absorbs the heat generated by the compressor as the air is being compressed which vastly increases it's efficiency, it doesn't condense and fill the IC with water either.

It's not a new thing, it's just one of those things that people in the UK never seem to bother with, it's something I'd very much like to try on my MR2 though

[ashley]

From what I understand the key is to inject as close to the compressor wheel physically possible, and you really want to inject through a small nozzle with as high a pressure as you can to ensure maximum atomisation...large water droplets hitting the compressor wheel at max speeds will pit the leading edge of the blades....not good!

But it is something I'm thinking of toying with as well- I really like the idea of changing the characteristics of the compressor flow utilising the phase change of water/ meth

[raptor95GTS]

Rob, how would you make sure the pressurised WI tank injects the water when half full? I'm likely missing something here

[masterbateson]

Presumably if your going to inject/mist into your turbo, would it be safe to assume you would have some sort of cut off solenoid type thang that prevented it working whilst turbo and engine are warming up and also when you want to cool down/come to a stop?

If your reservoir is pressurised I guess it doesnt matter if its full or a inch from bottom?
do they have a pick up hose type thing at bottom of reservoir feeding up and out? going for a gander.

That link i put up shows how to do it with a pump, do you know of any pages /links Rob that tell/show you how to do an install without a pump using the turbo to pressurise the reservoir tank?

[C35Rob]

Rob, how would you make sure the pressurised WI tank injects the water when half full? I'm likely missing something here

Im not sure what you mean?

Pressure source going into the top of the tank, the water out can either be tapped into the bottom of the tank, or run a siphon/pickup tube to the bottom of the tank from the top so as long as there is water in the tank it will always get pushed out

There's loads of info online about it, it's big in rotary circles, if you can't find what you are looking for I'll post something tomorrow when I'm back on the laptop

[C35Rob]

this is the most simple explanation of how it is/should be set up



this diagram shows a nozzle that mixes air with the water to help atomise it, in the same way a spray gun nozzle works, it's not required if you've got a decent water nozzle, which simplifies the install a little more.

you could even lose the pressure switch and solenoid and make it entirely mechanical by installing a ball and spring "dawes device" manual boost controller type check valve in the supply line which will only open at the desired start boost pressure

[masterbateson]

Manual boost control jobby sounds a good idea! less to go wrong.

[raptor95GTS]

looks nice and simple but maybe not onto a ceramic turbo with 150k miles on it. Saw a build thread and on this for an rx7 and now the guy has pitting on the turbo blades. Might not be the cause but I reckon if I go down WI I'll post turbo inject it

[C35Rob]

The only ceramic thing on a ct20 is the turbine wheel. Compressor wear would only be an issue over a huge amount of miles or if the nozzle doesn't atomise the water well enough.

I wouldn't post turbo inject, injecting pre turbo is the best way to do it, bit for ease of installation and performance

[masterbateson]

Pre turbo may be best option, but i think most people just squirt it in b4 the throttle body or and correct me if I'm wrong but....
I dont think i imagined this but you never know, But i think some peeps drill the inlet manifold on the underside so mist jet points up I think.

Not saying this is best way or owt but sure I've seen summat like that.