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I'll be running a direct port system in the near future. I have the NOS "NOSzels" that fit under the injector. By searching the web you can find many jet size calculators. You enter the number of cylinders and the hp shot total you want to run and i think maybe a few other numbers(fuel pressure?), and it'll give the nitrous jet sizes and the fuel jet sizes youd need. And like SJ Sleeper said, these sizes will be much smaller than the ones for a plate system or single nozzle. I'll be running larger nitrous lines from the bottle forward due to the HP shot increase plus i need to get solenoids that will support my planned hp levels with the direct port system. Ill also be running a second fuel pump as a dedicated system(all fuel will be race fuel).
As for the ar/fuel question, i dont know exactly, however i am considering running an O2 sensor in each primary to be able to monitor it all. Extreme but effective.
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