I've been reading and researching on this subj and still can't come to a conclusion, need some input :)

I've got V9 RAC swap, 3" TB, added spec c 12l tank for ic spray... not tuned yet
planning to run this turbo/engine till it fails

I also have a reflash to run US 93 octane since JDM timing on RA ECUs is way high

Is there a poing to add water injection system to this setup at its current stage? I would like to be able to run a more aggressive tune, but I would only use 100% water as I don't want to bother with meth.... finding it in a middle of nowhere at night is not an option for me; plus when I ship the car to Moscow, gas here sucks
I will however use 50/50 for winter probably, for it not to freeze

Also, if I run it with the Spec C tank, which kit/pump should I go with, and how many miles will the tank last for?

Yes, there is a point. Good luck running 100% water in the winter though.

peace

Some windshield washer fluids have methanol in them. That's what I have been using for a while. You can find it at any automotive store. I tuned my vf39 at 18lbs with the stock injectors and then turned on the methanol and cranked the boost up to 22psi and saw no knock at all (I don't recommend this). Look into it.

I think most of them are ethanol based actually, which I've been told is not very good

All you have to do is read them. They'll say methanol. At Discount Auto Parts they have a blue kind and it's only $.79 a gallon. It'll even say on the front "Warning contains methanol".

I think most of them are ethanol based actually, which I've been told is not very good

Most of them are methanol based, but it really wouldn't matter either way. There's nothing wrong with ethonal in most cases(course some injection parts from some companies might not work so well with eth).

peace

http://forums.nasioc.com/forums/showthread.php?t=1155692

Please read. Methanol in your water will give you more octane plus freezing protection. Plus can run leaner, more timing.......

http://forums.nasioc.com/forums/showthread.php?t=1155692

Please read. Methanol in your water will give you more octane plus freezing protection. Plus can run leaner, more timing.......


You can't really run leaner...What is being done is when you have the car tuned, not as much fuel is added to the fuel map when the meth system is spraying. Your AFR's should be targeted the same as pump gas. About 12.5:1 or so is excellent. If you run lean even with water/meth injection spraying, you will still knock/detonate. AFR is still AFR.

Please Read...
http://forums.nasioc.com/forums/showthread.php?t=937176

DP

El Gato, I've been following your progress, very nice
are you going to use the spec c pump as priming or you are going to modify the tank?

DP, true but in my case I would only run +meth in winters probably, so my main concern is whether $1k of parts and more for tune is really worth for only water:)

Imo it's worth the 1k, but.....

El Gato, I've been following your progress, very nice
are you going to use the spec c pump as priming or you are going to modify the tank?

DP, true but in my case I would only run +meth in winters probably, so my main concern is whether $1k of parts and more for tune is really worth for only water:)

Which EM system are you using? Access? If you use something that is capable of using multiple maps with switching between them, I would get a water tune, and a water meth tune. You will need both if you are going to do meth only part of the year. The fueling requirements for water and water meth maps are different.

DP

You don't need seperate water and water/meth tunes. All you need is a tune that works with both mixes. It might not get you max power, but it's probably a good idea to leave a little room on the table anyways. Not saying that it isn't good to have seperate tunes for both mixes, but it's not needed(especially when there's only enough meth to keep the water from freezing).

The injection tank you use will last a given amount of time depending on a few things. One would be the size, one would be the flow rate of the injection system, and another would be how much the injection is used(not counting evap or anything). Hypothetically speaking, a 12l tank is a little bigger then 3 gallons, and our gas tanks are about 15.5 gallons. This basically means that if you ran through a full tank of gas at hard throttle while injecting 19% injection to petrol, the gas tank and injection tank would run out at the same time(and both need to be filled). If you only ran injection for half of that time(which is more normal then running through a full tank of gas with injection on), you'd only have to fill the injection tank every other time you filled the gas tank. If ya ran 9% injection to petrol, and you use injection with half of the fuel in the fuel tank, you'd only have to fill the injection once for every four times the gas tank is filled.

peace