Need some help with my math, how much HHO needed?

[nowhhs]

I'll try to find some of the obvious mistakes. First, the engine only sucks in air/fuel during the intake stroke, so your 3200 rpm = 1600 intake strokes/min. Change the 3200 to 1600. Next, throttle position has very very little effect on the amount of air/fuel being sucked in, 3200rpm uses approximately the same amount of air/fuel whether at 20% throttle or 100% throttle, so take out that calculation. Next, 14.7:1 ratio is by weight, not volume, which is what you're doing. So to find the amount of fuel you're using, you first have to find the weight of the air your engine is pumping. That makes the rest of your calculations moot, so when you get to this point, re-post and I'll try to "help" more. Good luck.