Fuck I think 80-20 is possible for sure, might be a bitch but hey its nitro.
I think 20% nitro is close to the limit, not that I have messed with it personally...just alky here (4-strokes and 2-strokes)
Nitro I think can be ran but MUST be injected once you get into the 60-40 or 50-50 range and above.
100% Nitro simply can not be properly delivered from carbs because air velocity is not enough signal to pull the amount of fuel needed to run the motor with out going lean. A fuel that has a proper air to fuel ratio of 1.5:1 must be forced not vacuumed in by a weak carb signal.
Bansheebeefm2m do it man, the banshee world is looking for a nitro pioneer not that it hasn't been attempted before. Now we need some bad ass mechanical engineer to create a nitro injection system woot woot