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Old 07-22-2006, 04:36 PM   #1
Scooby Specialist
Member#: 6672
Join Date: May 2001
Chapter/Region: MAIC
Location: murland
Default alchohol injection kit for mild tuning?

i've been searching and reading about these kits, but I am left with a n00b question which I hope is a good one.

One of the things that comes up in reading about alchohol injection is that the injection of alchohol and water cleans out carbon deposits in the cylinders (fuel injectors too? I don't get that part) as an added benefit. And I get that the main idea is to provide some control over detonation, so that higher boost can be run safely.

Obviously, most people seem to run these kits as a way to run higher boost "safely" (where the reliability of the alky injection system becomes a very important factor - presumeably you want to keep a seperate map in your EM system to fall back to at the first signs of failure of your injection system!) and get more power.

But I am wondering if there can be any benefit to running a milder tune with an alchohol injection system? Say you were to have your engine tuned to a level that would be at the high end of "safe" without the alchohol system. Would there be any point in running alchohol injection in this case?

I guess this question boils down to what the real value of these "added benefits" like cleaner cylinders, etc are.
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Old 07-22-2006, 05:23 PM   #2
Scooby Guru
Member#: 94070
Join Date: Aug 2005
Chapter/Region: South East
Location: Dirty South
05 LGT


I just installed my coolingmist kit a little over a week ago. I did not have the controller so for the last 10 days I have ran pure water. My EGT's were 1/3 lower than prior to using water injection. I have not been tuned for it yet, but on 3rd gear pulls I could visably see the difference.
Today I finished installing the controller and use a 50/50 mix of water and alky, what a difference in top end power. The EGT's are still way down 1/4 of what I ran before the kit.
This would lead me to believe that even if you had a stock engine/ turbo and wanted to peak the tune out with a pro yuner you would benefit from pure water ( you could increase the boost more without leaning out) or with a 50/50 mix of water and alky.
I am very pleased today and will wait until I am Pro-Tuned to report the power bands.
To answer your last question if you can deter any knocking in the engine with cooler cylinders than it is a well worth the dollars mod. It should pro long the engine life if you stay within the parameters.

Good luck.
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Old 07-22-2006, 06:05 PM   #3
Scooby Specialist
Member#: 36528
Join Date: May 2003
Location: florida
2002 Impreza Wrx


Originally Posted by bWRX
...But I am wondering if there can be any benefit to running a milder tune with an alchohol injection system?...
Parts would last longer and there would be less chance of something going wrong. This doesn't have as much to do with how much water/alc is injected, but moreso how the car is tuned. You could have the car tuned for the same power as b4 the injection, and you'd get all the benifits but the power increase(if that's what you were saying). Here's some benifits your didn't mention....

Cooler intake charge
Keeps engine parts cooler
Costs less then fuel(better fuel economy at hard throttle)
Could possibly help spool(I'm not sure about this one)

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