Sorry so late to this thread. I spent a fair amount of timing working to remap the ECU to get rid of the rev hang and was not able to do so after working through multiple tunes. The issue is that unless you keep the timing where it is, it tends to detonate even on higher octane fuel. I can get not hang, but it also will destroy the engine. I don't know enough about car tuning to add more than that. It is annoying and someone should fix, but it is not a deal breaker for me. It's a fun car to drive, but if you are looking for a modern sports car, a Miata is what you want. The roadster has a lot of character and is always special, it's just not a modern completely sorted car. That said, I sold my F12 as I enjoyed driving the roadster more so that says something.
