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Originally Posted by Richard L
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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That's roughly what I thought.
Cheers Richard, I'll add this info on my website if you don't mind 8)