This chart compares my 36 N2O jet run to my 40 N2O jet run. It is interesting to note that even 4 jet sizes larger had no more effect on the engine until after 4250RPM. I don't have the shop manual, but I am assuming that at 4250 RPM, the VRIS #1 opens and allows the N2O completely into the intake hence the true effect shows.

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