In RC condition is used ratio of 15-20% of nitromethane to fuel (methanol in this case) for power add. You should use similar ratio, so injection of just 30%nitrmethane mixture should be not enough to notice power gain....Use pure nitromethanol and tune flow to about 15-20% to fuel flow....Just note that neitromethane is realy agressive thing what eat metal, be aware of your pump.
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