If you're referring to the "oversubmitting" algorithm,

a) this appears to be turned off by default (line 1535)

b) if turned on it only applies to new users (lines 1539, 1540)

(Disclaimer: this is the first time I'm looking at the source, please correct me if I'm missing something.)

Can some arc hacker explain the algorithm for the rest of us here. As far as I know the rank of post declines exponentially over time and improves with upvotes. Does the decay also depend upon the rate of submission and the points earned by previous submissions?