OK first off what kinda car is this? This can be done pretty simple. But i reccomend you have some way of logging timing and AFR whether it be via a wideband or "close enough" Narrow band o2 sensor Mv output at WOT, an no not one of them USELESS autometer AFR guages.

And with a mild 100 wet shot, on 93 octane timing can usually stay stockish as long as its not like 30* advance at WOT.

But if your car is like most others, they see the colder temps at the IAT and ADDS timing (3-4*). But i can only speak from experience on GM vehicles when it comes to that.