Ruby on Rails

I have a question about refactoring, I just joined a company with a
rails 2.3 code-base (pretty large and not many tests) this site has a
user facing site, but the bulk of the functionality is for the admin
facing portion of the site, I want to build a nice API with OAuth as
well as make it easier to maintain and push the user facing portion
forward, should I just try to build it on top of the existing rails
2.3, should I create a new site for the user and api portion on top of
rails 3.1 (not sure how I would share the models and other logic
between the two though), or some other method? ANy best practices
here?

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