I never really thought much about running the nitrous in very cold weather. I guess that’s because I don’t drive the Camaro in the winter. But even on cold fall days, I tend to leave it off. You will mkae a lot more hp with denser air and since my combo is kind of on the edge anyway, I tend to be conservative with either very high or very low air temps - the tune is not calibrated for either.
In your case, a small shot (50-75) probably won’t be so critical. But you will certainly need to get the bottle up to temp or else you’ll be rich as hell with a wet system. Your cylinder walls will not like this and will slow you down. Just don’t get greedy. Nitrous is like a drug and if everything seems fine at say 75hp, how could another 25hp hurt? Unfortunately, it can. It’s an all or nothing thing. Everything will be fine up to the point of a major meltdown. I would be reluctant to find this point on my DD or any car that I wasn’t financially and emotionally ready to rebuild.
One other thing, once you start to use anything over a small nitrous shot, you need a way to retard timing. Nitrous really increases the speed of flame front propagation. The result of a too early rise in cylinder pressure (before TDC) can be very very bad.
Rich