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Originally Posted by NAnderson
..I'll actually be running two similarly sized nozzles, but being that the pre-compressor nozzle won't have boost working against it it'll see full pump pressure (if not a touch more due to vacuum). The post-compresor nozzle will have anywhere from 25-35 psi of boost pushing against it and thus won't "seem" as large as it actually is.
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That's very true. The precomp nozzle will flow a bit more compared to a post-comp nozzle of the same size.
There is actually an older thread where we calculated that difference.
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So John, would you recommend activating the pre-compressor nozzle first, and the post-intercooler nozzle second?
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It depends on how hard you drive your turbo(s) I suppose.
If they are pushed way out of their efficiency islands then I'd start precomp injection a bit before they start getting outside the manufacturer's max boost intentions. But all this is experimental you see, we are all learning from our own (and those of others) mistakes. Hopefully.