I've had drove, owned and rode in multiple 500+ horsepower cars and trucks and this TH is byfar the slowest of them all which is sad, I can do one today and post the results.
I've done test like this in all modes except for winter and get simliar results. I've custom tuned it and such, I figured something was wrong when the best time I could pull on the track was a 12.8 and that was with a good launch and a .113 second reaction time..
As stated before you need to press your Drive Modes button and look at the engine color - Red = fast, Yellow = slow. You mentioned a custom tune...did they dyno your jeep during this tune? If you had a good tuner they should have been aware of any issues if your jeep wasn't hitting 600HP+. Look through the forum, this has been talked about numerous times.
I mean I set the custom option up on my jeep, the button to the right of the dial, and still does the same thing. My apologies.
You have key fob issue - your engine color should be red, not yellow. Have your dealer reprogram you key fobs. You can look back in the previous "missing horsepower" threads to see what others have said to their dealers to remedy this issue. You'll be amazed at the difference once fixed.
Then you definitely have a problem. I have two 750+hp sports cars in my garage right now, and have competitively drag raced for close to 30 years. My TH runs the numbers it claims...and would dust any 300-400hp sedan on the road in an acceleration contest.
