ustolemyname??stevieturbo

iTrader: (1)

You have too much time on your hands. With a good FMIC, water inj shouldnt really be needed.
Despite that, my cheapy DIY setup on another car, only used a small tank, ( header tank from a Vauxhall ) headlamp washer pump ( windscreen will do, but are crap ) and an aquamist jet.
I also fed boost pressure into the header tank to keep the water pressure relative to boost. Used a Aquamist pressure switch to trigger. Using methanol is definately better, 50/50 with water.
These water tanks are small, and I would recommend something bigger, but if pressurizing it with boost, make sure it wont explode or leak. A good headlamp washer pump will produce approx 80psi, with a windscreen washer only about 15-20psi, although this will probably vary. So a headlamp washer pump will work from a non pressurized bottle, but a windscreen pump will struggle. also mount the bottle with the water level lower than the jet, or fit a check valve so the water doesnt drain out into the engine. If you place the jet in the inlet manifold, use a good check valve so the engine doesnt suck the water in off boost.
Also use clips on all hoses, just in case.
For my rough DIY pic, see the Snet Other marques mini turbo post.

[Edited by ustolemyname??stevieturbo - 10/1/2002 1:40:59 AM]

john banks

Would be interesting to see the effects on EGTs? Of course if the EGT is too low it might harm spool up a little? How rich are you running it? Despite the FMIC I could still use some more det control. Presently my timing is 16 deg at 4800 RPM rising to 26 deg at 6300 RPM with 1.5 bar dropping to 1.3 bar and this is within 2 degrees of detting across this range (not transitional that has gone since the FMIC and catch can).

[Edited by john banks - 10/2/2002 10:47:31 PM]

David_Wallis

You water injection tank?

Do you run a helper pump, if so what... where have you mounted the tank? (do you centre it for track days?)and is it baffled...

Oh and do you put methanol in?

Cheers

David

David_Wallis

Ive bought an aquamist 1s system... just wondering on tanks

David

David_Wallis

ttt

AlanG

I use a 20litre boot mounted tank, baffled and a couple of outlets on it. Also has level probe in it, so pump shuts off when water gets low (pretty rare)

Set up runs fine without helper pump, but intend to fit one to be on the safe side...

Alan

ustolemyname??stevieturbo

iTrader: (1)

Pump shuts off??? Id rather have a warning light that came on, rather than the water inj stop working.
20 ltrs.. you will need a few more HP to carry it about. Id say 5ltrs would be plenty. A well setup water injection system shouldnt use that much water. 5 ltrs should easily last a month of normal driving, with a bit of 'enthusiastic' driving thrown it.

AlanG

Agree with what you say, but i'd rather save a pump from going AWOL than an LED which tells me it's went AWOL.

Yeah 20 litres....tank doesn't look that big either but as you say, lasts for absolute ages.

Further safeguards are needed on my setup admittedly, but it's early days. Need to get the car running reliable enough with recent changes to then think about the water injection.


A

ustolemyname??stevieturbo

iTrader: (1)

I think id rather save my engine, knowing the tank is empty with a warning light, rather than saving the pump, from the tank being empty, and not knowing about it.
Unless the water injection is only a precaution, and not actually needed to stop det.

AlanG

I run a front mount, so yes it's not necessary in my case for det control.

I tend to use it for cylinder cooling instead of the std Subaru set up of running slightly richer mixtures to do the same thing.

A

Andy.F

I've taken my water inj system off.....too much weight

David_Wallis

Thats cos your a lard ****..

Im putting it on due to the boost I want to run

David

Pavlo

John,

Has the catchcan/open breather system made any changes to the way the engine runs?

You seem to be running quite a lot of advance at high RPM too, although you are dropping boost (and VE) at the same time, still seems high.

Paul

uxg

I was considering fitting aquamist rather than an FMIC as I do not like the idea of chopping up my front bumper. Is this a viable alternative or a good idea

Also I have heard from several people that Aquamist or excess water in the engine isn't actually a good idea as it can lead to something called borewash which isn't good. I don't know too much about this but is there any truth in this?

David_Wallis

AFAIK borewash is when you have too much fuel (or water I suppose) this then doesnt combust and runs down the side of the bore washing the thin film of oil off the bore.. thus causing premature wear...

Water Injection on a std engine will loose you power..
it depends on the spec of your engine, and what you want to achieve. I want to run about 28psi boost and advance the timing as much as possible, this is why I am using it.

To be honest though I can only see borewash occuring if its set up wrong.

David

Andy.F

Glad I'm on hol in Cyprus when this goes on the rollers, doubt if the shrapnel will reach me there

David_Wallis

yeah yeah...

And your more stupid than I thought if you think it will make it to the rollers

David

Andy.F

David

The more people say it can't be done, the sweeter it is when you do

David_Wallis

LOL...Be waiting a while... Mind you wish mum hadnt gone to bed... left the camera in that room and Ive just spent three hours with my dad doing the downpipe.. and its a work of art if I do say so my self...

David