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Originally Posted by NAnderson
... My question centers around the order of activation of these two nozzles. Should I activate the pre-turbo nozzle first (~15 psi) to cool the incoming charge and the post-intercooler nozzle second (~20-25 psi) to help with knock supression? ...
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Your logic makes sense.
You should also think about the relative size of the nozzles, as they are directly related. The more the first one sprays, the lower the compressor discharge temps are bound to be. Also some of that water will still make it to the chambers, reducing the need for a bigger nozzle post-intercooler. :wink:
Ambient temps and fuel octane also play a major role obviously, in the winter with race fuel you'll need smaller nozzles compared to pump fuel in the summer.
I'm experimenting with a similar setup by the way.