The clue is in the title. Flow rate. The only thing that matters is the relative flow of different jets; as it is liquid fuel that flows through them. Jet tech or other software is great, but you must set it up to your own set of jets & carbs by track testing or dyno work to find the best set up for particular conditions. Then enter this info. to your software for a particular carb too. When the conditions change, enter that data and the software tells you what jet to use. Using your own set of calibrated jets you can ensure you are going weaker or richer by the correct amount. It is even better if you can test / dyno at two different sets of conditions further apart - hotter / colder, low / high pressure / humidity. Then you can double calibrate the software to see if it cross checks to the two different sets of conditions. If you get it working well with a set of components - carb, jets, engine - don't expect it to work well if you start mixing and matching. Either way we tend to play it on the rich side as I have seen what happens on the dyno if you go one jet too weak compared to one jet too rich!!
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