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Difference in the tune with water injection?

Old 01-21-2008, 10:44 AM
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Default Difference in the tune with water injection?

I'm considering picking up a water kit and was wondering what the impact might be to my tune... i know some people experience a decrease in power or no gain at all without additional tuning but what exactly changes? Will it lean out my tune? Higher EGT's? Just curious about what i should expect with this add on...
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Old 01-24-2008, 01:27 AM
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Default Re: Difference in the tune with water injection?

Without any tuning...you will run richer and your EGTs will drop.

The Meth in Water/Meth is a fuel so you are adding a higher octane fuel in the mix. The other 50% is water which takes heat out of the system as it absorbs a lot as it turns from liquid to vapor.

With tuning, you will need to lean out your mixture and add timing to start the burn sooner.
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Old 01-24-2008, 08:29 AM
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Default Re: Difference in the tune with water injection?

Originally Posted by xenocron
The other 50% is water which takes heat out of the system as it absorbs a lot as it turns from liquid to vapor.

With tuning, you will need to lean out your mixture and add timing to start the burn sooner.
Water is neat because it acts as an acid or a base, in a combustion reaction it helps strip free radical hydroxide molecules (base), promoting better more steady flame propagation. This is another big reason you can crank the timing.

Also the water usually doesn't see enough dwell time to vaporize at all, the temperature differential just isn't high enough at pressure levels seen in a boosted vehicle. The methanol, on the other hand, evaporates at a much lower temp and would sufficiently draw heat from the intake charge.

In a naturally asphyxiated car the manifold is in vacuum so the water would vaporize at lower temperature, drawing heat from the charge.
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Old 01-24-2008, 10:04 PM
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Default Re: Difference in the tune with water injection?

Your tuning depends on what you're trying to accomplish. The presence of the alcohol - which requires more oxygen to burn per volume than your fuel does, making the mixture richer. Both water and alcohol will give you higher pre-ignition supression than a rich gas mixture will.


Which allows you to do two things... Run leaner possibly with more timing, effective compression, and intake charge to make more power, or run about the same and have increased surviveability at the cost of some, to no performance. Depending on how far you take it.

Pick and choose.
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Old 01-24-2008, 11:52 PM
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Default Re: Difference in the tune with water injection?

Excellent feedback, thanks guys...
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Old 01-25-2008, 12:05 AM
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Default Re: Difference in the tune with water injection?

Originally Posted by 93preludes
Excellent feedback, thanks guys...
Yea man there's a sticky in Forced Induction on this subject too. Links and such.
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Old 01-25-2008, 04:41 AM
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Default Re: Difference in the tune with water injection?

I like the old threads better
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Old 01-25-2008, 03:39 PM
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Default Re: Difference in the tune with water injection?

Originally Posted by Toysrme
I like the old threads better
I personally can't stand four pages of Fred and JD sucking eachothers *****.
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Old 01-25-2008, 03:53 PM
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Default Re: Difference in the tune with water injection?

i'd just rather run e85. simpler and cheaper. imo.
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Old 01-25-2008, 07:39 PM
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Default Re: Difference in the tune with water injection?

Originally Posted by one2many
i'd just rather run e85. simpler and cheaper. imo.
Ethyl propylene has a lower potential than Methyl.
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