i think this link may be helpful, i not sure how accurate it is, but the moderator might want to make it a sticky in this forum. it calculates, according to the fuel jet size, nitrous pressure and fuel pressure the amount of hp that jet makes.
http://www.robietherobot.com/NitrousJetCalculator.htm
i think it is mainly for NOS brands, but it maybe helpful for others.
i gotta give credit to Asleep_94_Altima from the nissanforums.com and to the nissantalk.com forum.
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'91 Red Sentra SE-R: my Daily Beater
'94 Black Infiniti G20t: the Wife's ride
'96 Red Jeep Grand Cherokee: the Gas Guzzler
'07 Sunlight Silver Mazdaspeed3: 263hp, 280lb-ft torque, Injen Intake, HKS SSQV BOV
'92 Black Sentra SE-R: 9.20 @ 74.xx mph, 1.98 60ft. 1/8th mile N/A
8.239/8.243 @ 82.xx mph, 1.784/1.726 60ft. 1/8th mile w/ Nitrous
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