Nitrous and Timing.... Whats the purpose???

[obengston]

I know some my be like if you don't know then you should not be using it..(and possibly so). My question here is what is the reason/purpose of pulling timing when your on Nitrous. I have a really nice set-up that I built a couple of years ago and have never had a issue, but was just curious as to the timing part. Does it have anything to do with not running lean?? I run a 200-250 shot and always pulled x amount of timing out, but the other day I hit the nitrous and forgot to pull the timing (got lucky I guess nothing got hurt that i know of), but my air fuel ration did not change or lean out it stayed about the same as it does when I pull timing, and thats why I'm asking this question. So I'm guessing it has to due with something else besides the AF. My normal AF is 12.8, and when on Nitrous its low elevens.high tens. Thanks