i wasnt sure if there was a specific n20 forum or not but i was wondering what rpm is a safe rpm to activate on a d series? on a domestic, which is what im used to its 3k rpm

reason i was asking is some have mentioned using n20 while not in full boost then shut of the nitrous when i reach full boost. but if its also 3k for a d series then it may not be worth it, 3k turn on nitrous, 4k full boost, turn of nitrous.