#1
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maximum flow for 0.4 mm, 0.5 mm, and 0.6 mm Aquamist nozzles
This is for my supercharged Focus (big boost Jackson Racing Eaton/roots style supercharger running 14 psi of boost). I'm not sure which nozzle will be best to start with, and I want to know what the maximum flow rate is for those three sizes. The 1s kit comes with the 0.5 mm nozzle, if I'm not mistaken, but I wonder if this will be too much for a Focus that is (before injection) making about 180 whp. Should I start with the 0.4 mm nozzle?
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#2
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I think the 0.5mm jet is a good start. I based the WI rate by your power output of 180whp. Not sure what that would translate it flywheel HP - I guess it will be around 220-230HP?
You will require approximately 500-600cc/min of fuel per 100BHP. if you are injecting 1.1 litre of fuel /min then one 0.5mm jet will equate to about 20% of water to fuel ratio. We normally recommend between 10-15% but due to your lack of intercooler and making boost on top of the standard compression ratio(?). I think 20% is about right. Please post your results when possible.
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Richard L aquamist technical support |
#3
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Richard,
Another relevant question I think: Is there any rule-of-thumb regarding the activating boost-pressure for the WI? |
#4
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Thank you, Richard. On the Focus, 180 whp works out to probably around 210 flywheel hp. Does this change your assessment any? Thank you for the information!
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#5
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No, 0.5mm jet is fine, roots type supercharge tends to have higher discharge temperature than the centrifugal type, the 0.5mm jet shoudl work well.
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Richard L aquamist technical support |
#6
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John,
Rule of thumb for the onset of water injection for normal unmodified factory car should be just nelow the factory boost pressure. 10% of water will normally allow 1 compression ratio increase or arounf 3.7psi. Other factory such as ambient temperatures and fuel grade woudl affect the quoted figure.
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Richard L aquamist technical support |
#7
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Mushin,
Does the Jackson Focus kit come standard with 14psi?
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Richard L aquamist technical support |
#8
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Quote:
Cheers Richard, I'll add this info on my website if you don't mind 8) |
#9
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Quote:
No, it comes stock with 5 psi, at best. I have a larger crank pulley and smaller supercharger pulley, 42 lb. fuel injectors, and custom tuning. |
#10
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Mushin,
Unless you have your compression ratio decreased, you need to run at least a 0.7 or 0.8mm jet - no intercooler assumed.
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Richard L aquamist technical support |
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