Alchol injection ? - Subaru WRX Forum
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post #1 of 5 Old 03-02-2006, 02:38 PM Thread Starter
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Alchol injection ?

i have an 02 wrx with about 320 HP and i want to know what you experts think on putting alcohol injection on it... would it really do what they say it will looks pretty cool becuase its stealth status you cant even tell that i would have it. and what else do i need to run this stuff... will it hurt my engine at all ... heres the website that i want to buy it from.

heres pic of my engine...
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post #2 of 5 Old 03-02-2006, 05:03 PM
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As is wise when running high boost levels, tools critical to tuning are highly recommend to be used in conjunction with this kit. A wide-band 02 controller, knock link, and tuning are suggested.

Unless you've got tuning software and the knowhow to use it, Id stay away. There are other ways of lowering your intake air temp. Try looking for a C02 inter cooler sprayer. Nitrous ones are made also but the price of nitrous has gone through the roof.
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post #3 of 5 Old 03-03-2006, 05:56 PM
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Water/alcohol injection will do more for you than just lower the air charge temperatures. The most important benefit is it raises the octane of the pump gas that you are using. By doing this, it will eliminate knock caused by detonation, even when increasing your boost. Obviously there is an upper limit though. To figure out if you would benefit, find out if your computer is pulling timing to compensate for higher than stock boost levels or from high intake air temperatures. The computer will try to always output a given max horsepower. This is why when it is cold out, your boost will decrease (unless you can control it), compensating for the denser air which makes more power. With water/alcohol injection, you can significantly raise your boost, and since there is no knock, the computer will not pull timing.

Kits are pretty easy to install, it just consists of mounting the injector(s), and then runing the tubing and wire. The wiring is like installing a stereo, the tough part is making sure it is a clean install and hiding the wires. As long as you have someone to answer your questions, it is a very simple process, and you will see gains. The more mods you have, the more power you will gain.

The main way that people get in trouble is by trying to build a DIY kit. If you know what you are doing, this is can be a great way to go, but most end up buying inadequate parts for the pressures that will be applied to them. The common weaknesses are the tubing and the solenoids. If you do a DIY kit, don't go cheap on those parts, buy something designed for the application.

Also, people get a little to macho and think that alcohol is the secret of the power, and then inject a 80-100% mixture. This is not true, but yet people inject a significant amount of meth (more than 50%, which can actually lead to more knock). If you do get a kit, try straight water first, then 10% methanol, then 20%, and so on, up to 50% max. Most find that around 20-30% works for them, but many people get the most gains from straight water.

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post #4 of 5 Old 03-03-2006, 06:34 PM
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You can also use water injection instead of adding extra fuel to keep the engine cool, thus raising your AFR.
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post #5 of 5 Old 03-03-2006, 07:46 PM
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i've been reading up on it and it seems the main advantage of it is that it effectively raises your octane rating which would allow you to run leaner without detonation = higher boost levels, by around 3psi. we all know higher boost levels = more airflow = more horsepower.

however for your application, talk to a local tuner to determine whether or not running 3 more psi on your turbo is a good idea. if you're already running it at its max efficiency, any more boost and it's just blowing hot air and ruining your turbo

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