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Dec 10, 2012 11:01:51 GMT
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Morning all
Always fancied having a go at this water injection thing. Basically water in sprayed/misted into the inlet [usually after throttle body] to keep inlet temps cooler, makes engine more powerful as water contains hydrogen, cleans engine . . etc, you get the idea.
Anyway what kind of pressure should the water be pumped in at? I've heard of people using normal 12v car fuel pumps and working fine. On the other hand these subaru impreza driving people seem convinced that the pressure must always be above your boost pressure to work correctly.
Has anyone on here had experience or is this just a cunning marketing ploy?
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if you're gonna do it wrong, you might as well do it wrong properly
Gud välsigna det röda blocket
nissan cube - jdm toy
volvo 940 turbo - 22psi
FOR SALE 2002 NISSAN CUBE
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Dec 10, 2012 11:31:53 GMT
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Yeah, the pump must be able to provide more pressure than the boost pressure, otherwise no water will flow. Normal washer pumps won't be any good in a boosted situation, they'l struggle to do more than a few PSI.
Also, You need a pretty high pressure pump to get any volume of water through the "mist" type nozzle that you want to be using to cool the charge. We're talking 50-100PSI above whatever boost pressure you're running. Just squirting water into the air stream through a washer jet won't be nearly as effective at cooling the air as a fine mist.
There won't be any gains though the water containing Hydrogen, that part of it is all curse word in the same veign as all the "run your car on water" quackery. It does technically "contain" hydrogen, but not in a way that can be directly used as fuel. It will reduce the charge temperatures so there are power gains to be had.
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Dec 10, 2012 11:56:57 GMT
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froggy
Posted a lot
Posts: 1,099
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Dec 10, 2012 14:00:00 GMT
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I run it only because my car is mid engined and running serious power . I did a track day in August on a 32c day and got my inlet temps down to 38c running 1.9 bar and 450+ hp . I run 50/50 water meth mix through a proper devils own system with progressive controller but I don't map the car to take advantage if the cooler temps as that puts you at risk of a meltdown if the system fails .
On a scorching hot day it works a treat but I think there are better ways to get charge temps down in the long run .
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Dec 10, 2012 22:04:26 GMT
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Water injection doesn't add power, it just reduces the chance of detonation by cooling the mixture and reducing the temperature of the combustion process.
That means you can run more boost, timing, or an increased compression ratio safely. That's how you get more power with water injection.
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Last Edit: Dec 10, 2012 22:07:35 GMT by Lewis
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