[Rookie84]

Would it help if I just did 100% water injection? I got very curious about this and searched around here and on evom but didn't find much about it. I wonder if there are enough power to be had to justify the cost of the water/meth injection system. I've read that since it does cool the combustion chambers, you can run more aggressive tune since you don't have to dump fuel to cool things down although water/meth is better since it raises the octane rating of fuel. I wonder if there are any examples or dynoplots of those who run straight water.

[ninjaboy76]

Sure it would be beneficial to run water injection, but what the end all gains would be over not running it is hard to tell. It depends on the tuner and how aggressive they tune your car. Some tuners will only use it for added protection while others will treat it like race gas. There are some gains to be had both ways though. You can end up with anywhere between a 10-20% HP gain or more.

If you do decide to spend the money, then do yourself a favor and spend the extra money on an Aquamist HSF-5 kit. There are a lot of post about this kit on Evom, and how well it compares to the other standard progressive kits that are out on the market. The HSF-4 uses injector duty cycle to know when to spray vs. boost pressure. This leads to a more accurate amount of spray and also when to spray as well. It also has a built in High speed valve that act like a fuel injector. Again this leads to an accurate amount of spray vs. most kits that are either full on or full off. Plus there is the DDS3, which has built in failsafes. Search around and check out post made by Slowcar and Richard L. Slowcar has posted some great videos comparing this kit to others. Richard L. works directly for Aquamist, so product support is only a pm / phone call away. Check out the post I made up in the water injection sticky thread. Some of Slowcar's videos are on there. Those post will lead you in the right direction.

Honestly it wouldn't hurt your car to run a mix of meth and water. Water has twice the heat latency of alcohol, it requires less volume to do the same job, but meth helps raise the octane rating, and will also cool the intake charge. Its just that Meth burns faster than water. Water will slow the burn and cool the intake temps and combustion temps longer than meth. As long as the tune is spot on then you should be able to run a setup like this for quite a long time. I would suggest that you get on evom and don't be affraid to post a question or two if you can't find the answer. There are quite a few decent people on there that are more than willing to answer your questions.

I'm running 100% meth with my setup on my evo boosting 30psi. I still have some tweaking to do with my tune, but I only log 1-3 counts of knock on average. I plan on trying a mix of 80/20 meth/water in the future to see how they compare. Good luck.

[Rookie84]

Thanks for the informative post. Yeah, if I were shopping for a WI kit, HSF-5 would be on the top of my list. The reason I'm thinking about just running 100% water is it is very easy to find and I can carry it around in my car w/o any problem just in case I run out.

[halfelite]

Originally Posted by Rookie84

Thanks for the informative post. Yeah, if I were shopping for a WI kit, HSF-5 would be on the top of my list. The reason I'm thinking about just running 100% water is it is very easy to find and I can carry it around in my car w/o any problem just in case I run out.

For my meth install im doing to maps a meth map and non meth map that way if i get low i just switch maps and be ok for the drive home.

[PhantomSTi]

Originally Posted by halfelite

For my meth install im doing to maps a meth map and non meth map that way if i get low i just switch maps and be ok for the drive home.

This is exactly what I did for my Green. Pump gas map, and a meth map. I've never had to use the pump map (since I'm using the Spec C tank for meth).

But, just knowing I have it there if I ever needed it is nice enough.

[halfelite]

About how much meth do you go through. I havent decided if i want to use a spec c tank or a smaller one

[ninjaboy76]

If any of you guys needs a tank or an extra tank I have a 4 quart laying around in my garage I could sell for cheap. Just let me know. There are some excellent examples of meth setups on evom. I can't count the number of alcoholics there are on that site

Heres a link to mine: My HSF-5 install pic, plus a easier way to filler up! - evolutionm.net

[Rookie84]

Yeah, I know I can have two maps and switch back and forth... I'm still wondering the effect of water alone compared to water/meth mix.

[ninjaboy76]

Water will yield decent results, but you can't be nearly as aggressive without meth.

[TheLimitedProject]

I thought that running any more than 80% meth was useless. Seems I remember reading something on here or NASIOC about that....

[halfelite]

Originally Posted by TheLimitedProject

I thought that running any more than 80% meth was useless. Seems I remember reading something on here or NASIOC about that....

Most people find it dangerous as the seals in the pump will fail over time and faster on 80% + on meth

[VSGTS14]

Originally Posted by TheLimitedProject

I thought that running any more than 80% meth was useless. Seems I remember reading something on here or NASIOC about that....

yea i think the difference in minimal.....but if you have your kit in the trunk and a huge 55 gallon drum of meth why not just use 100%, you don't have to go through mixing procedures.

[jays05]

I was never able to make any good power with 100% water. But perhaps I just didn't get aggressive enough with afr/timing. What I was having to do to make power... I didn't feel comfortable with. 50/50 felt like too much water. 80/20 and 100% meth felt about the same to me, but as mentioned, 100% meth is a lot easier to mix.