DSMTalk Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum banner

Water injection. pros and cons????

18K views 79 replies 41 participants last post by  jrotten  
#1 ·
i was wondering if anyone has or is using water injection for these cars. i have seen this done to some cars, scc project 300zx and they cant stop talking about it. for people who dont know what it is,it is a super fine mist of atomized water that mixes with the fuel, basically it will all but rid your car of detonation. it will take some power away because of a less potent fuel mixture, but from what i understand, it far out-weighs the disadvantages of lower power because you can run a higher boost without detonation. they, being scc and altered atmoshere performance, say that it is like having a full tank of race fuel in the car at all times. another good side effect is that known to keep your engine components cleaner due to the fact that in a way are steam cleaning the parts. i have personally had no experience with the system, but would like to know. the price seems to be very reasonable at only $210 for a spearco system. i emailed a guy who sells them for more info.
 
#3 ·
This is the way i understand water injection. Basically, with high boost engines the camber gets VERY hot. To prevent detonation, you have to use more fuel. This fuel does nothing for combustion, and is only there to cool down the engine.
Water injection is intented to take the place of this fuel. If tuned correctly you can make as much power as a non-water injection system, with less fuel. You will, however, have to make more boost. You will also have to have a water resevoir for the injection system.

Hope that helps.
 
#4 ·
avoid the spearco kit

It is a complete POS. The only kit that really seems to work well is the aquami$t one. There have been a couple threads on this, try doing a search and you'll see what people have already said on it.
 
#6 ·
$210 Where?? Pros- runing higher boost without melting the engine, lots more power on pump gas! steam cleaning affect on pistons,valves,intake,combustion chamber!an it's ALMOST like running race gas. Cons- refilling the water resevior, the more you boost the more you have to add water.(heard it can get aggravating),Having the system stop working for some reason, while your playing on highway, or race track! Having it leak to much water into chambers! Thats just what I found while doing some research on water injection. If you get it get the BEST SYSTEM out there, which from what I hear is the Aquamist about $500. Don't get me wrong the water injection works very VERY WELL, but I myself will just use race gas. the cons out weigh the pros to ME!!!
 
#8 ·
I've personally datalogged a car with water injection...

1G - auto running 18psi, stock fuel pump, stock injectors, stock i/c

Had a knock count of about 30 with the water injection turned off.

Turned the water injection on and knock went down to about 18.

He had the "smallest" jet in there and is going to install the next step up. I'll let you know when I get it datalogged.

definitely made the car feel smoother.

He built his own kit (very nice!!)...ended up running about $300 for top of the line components.

I'll post a link if I can find it.
 
#9 ·
Corky Bell

Well remeber that he says that it's basically a bandaid for not having an efficent enough IC. Well 1G bumpers aren't that big, you can't have a huge FMIC without cooling problems.

Oh and Dyre nice car :) I like 7s.
 
#10 ·
Thanx Nick. I do to, thats why i rescued it from the Ghetto... :)

I really shouldn't have bought it, its in pretty bad shape... :( I hate people who abuse great cars.

Water Injection seams like a great way to cut down on gas bills when pushing 350rwhp. I can handle filling up a water tank every couple days if it saves me 2mpg-5mpg...
 
#11 ·
1st of all, thanks for all of the replies. so the spearco is a POS, anyway it goes for 210 at alteredatmosphere.com, it is a link from the dsm link page. where could i get the aquamist and for how much? race gas is hard for me to get and is very expensive, about $4/gallon. 300-400 bucks one time would surely make up for the difference in due time, plus it keeps your engine cleaner, better combustion in the long run. keep the advice comin. does anyone elso know someone who runs a water system on any turbo? what do they have to say..
 
#12 ·
Get ALCOHOL injection. Wait for bigger turbo. Just allows more boost without knock. If you have a stock turbo, the extra boost really isn't doing much. With a larger turbo, then that extra 5-7lbs of boost you can run will make a difference. It also cleans the engine spotless. If your intake manifold looks as bad as mine does on the inside it might take ahwile, but you would be amazed how clean it keeps everything.

Do some reading here:
Alcohol Injection Tech Info
The Best Alcohol Injection Kit
 
#15 ·
Aquamist...

http://www.aquamist.co.uk/

That is the companies main site they have a vendors page and you can look there.
A larger Intercooler is better than Water Injection, but water injection still does have its added greatness especially when boosting over 20psi.
Corky Bell wrote a great book with lots of info, but he wasn't talking about running 20+ psi either.....
 
#16 ·
Capital Area DSM Club has had an ongoing thread in their DSMCA thing. I am too new to have caught the beginning but I'm sure if you ask somebody that has been around for a while and that saves them then you can probably get it. CapDSM is http://capital.dsm.org/
Can you use the wiper washer tank as a reservoir?? Would you need a different pump than the wiper washer one?? I took my sprayers off to make the car look nicer but I can put the tank back on and just modify the pump so it works.
 
#18 ·
the aquamist system

Mofugas sells the aquamist system for 500, its the same price evrywhere.
As far as it being a band aid for an inefficent IC, I can be quaoted as saying "what a load of crap"
personally, I would run both, its not like you can't turn the turbo up further to counter the cooling affect of both devices. I wonder if this guy has read the five page report by nasa explaining the benefits of water injection, but hey what do rockeet scientists know
As far as the supply of water, a small resivor will last a long time. When I set up my system, I went way over boardand used a two gallon gas tank, I haven't had to fill it for about 2500 miles. And being only 23, you can imagine how often full boost is hit.
 
#19 ·
cheap then expensive

Being young I can't afford a nice system. Can I buy a cheap system then upgrade later. If I do will I just have to upgrade the injectors or will I have to upgrade everything??
 
#20 ·
Sorry bro

but with this car you're going to find out there are things who need to save up for.
The aquamist system is a very finely machined injector and a super high quality pump, it requires no upgrading of your fuel ijectors
 
#21 ·
misunderstood

I think some of you misunderstood my question. I was asking if I can buy a cheap water injection system. Then when I have more money can I put an expensive Aquamist in. The injectors I was referring to were the water injectors not the fuel injectors. I was also wondering if upgrading it would just be a new pump and/or the water injectors, or is it the lines and everything. sorry about the confusion
 
#23 ·
Well I THINK I've changed my mind about water injection! Alot of the turbo GN guys Use the aquamist an talk VERY highly of it,none of them I've talked to had an failure with there systems yet. It would be nice to be able to run 23-24psi of boost on pump gas! and not kill the o2 sensor! Hell with my front mount also I MIGHT be able to run the full 26psi!! I'll do some more research before I make up my mine.
 
#24 ·
still misunderstood

I am still being misunderstood. I really am asking if I should get a cheap non aquamist for like $200 and then upgrade to an aquamist later. If I do this will I have to replace everything or just the injector and pump. I hope this clears it up.
 
#25 ·
Misunderstood youth

Damn, sorry dude, I know how it feels.
Heres the anwer to your queston.
The 200 dollar spearco kit shoots water in before the turbo, which is an awful hing to do to it. It also doesn't address the issue of atomizing the water properly, so it doesn't come with a eally good high pressure pump. I've heard people say that the best ting about the kit was he water tank. Pretty pathetic review for such a great technology.
Basically, you can't do it by upgrading, its worth the saving toget it
 
#26 ·
Personal advice... go to get an SMC kit from the GN board...

LIke $320... great setup.

AI is in many ways better than WI... but do to their Alchy and NOS tech board to get the answers from the guys that KNOW.