My old nitrous motor (360 eddy heads) tune was 27-28° timing with a 180 shot from my cheater system. This with 50/50 mix of 93 octane/110 octane gas. Altogether this knocked 2.8 seconds off my ET, 13.9-11.1 (this was in Colorado at Bandimere Speedway).
Too much timing can kill a nitrous motor very quickly, but so can a lean condition. Nitrous is an oxidizer, and it wants to "eat" in simple terms....if you feed it plenty of fuel it is happy (and relatively safe), if you don't it will eat whatever it can get...like spark plugs (if you are lucky) and pistons (if you have no luck).
