You're right about running rich @ altitude, don't be afraid to go back to stock fuel pressure, the stock fuel pressure supplies enough fuel for 300hp at seal level. You're right about the nitrous too, it supplies it's own oxygen so you've always got near optimum air with nitrous. Since the amount of oxygen in the nitrous is always the same, the amount of fuel will be the same too. As far as I know the only condition for changing the nitrous/fuel ratio would be the bottle pressure.
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393W: AFR 205's, hydraulic roller, TKO600.
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