I used to use Sport mode whenever I wanted the car to be more responsive and quicker back when it was stock. Even though it locks out 6th, you can still shift to 6th yourself, car just won't do it on it's own. I stopped using Sport mode once I got a tune as Steeda told me their tune only applies to "Drive" setting. The tune itself makes the car respond, accelerate, and shift much better than stock, even compared to sport mode so I haven't used it since. From what I've heard in other forums, tune parameters are kept, except shift points when you switch to Sport mode.
Hey c_rizzle, If you notice sport mode outperforming your tune in "drive", you might want to contact FRPP and have them make some adjustments to your shift points to match Sport more closely, if that's what you always like to use. When I asked Steeda about my tune in Drive vs Sport, they told me it only affects Drive and I'd never have to use sport again as their tune should improve everything. I tested it a few times using Drive vs Sport and pulls just as hard using my butt-dyno, but it drives/shifts more to my liking. Oh, and nice 'stang btw. I wanted my convertible in that color, but all they had was black at all the dealerships and I thought, "That looks sweet. I'm sure having a black car isn't as bad as people say for cleaning". How it pains me to clean it, polish and wax it one day only to then see a fine layer of dirt/pollen the very next day.
Now I'm curious...anyone else with a tune notice a positive difference using Sport vs regular Drive?